arch/powerpc/kernel/head_64.S

   1 /*
   2  *  PowerPC version
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
   6  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
   7  *  Adapted for Power Macintosh by Paul Mackerras.
   8  *  Low-level exception handlers and MMU support
   9  *  rewritten by Paul Mackerras.
  10  *    Copyright (C) 1996 Paul Mackerras.
  11  *
  12  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  13  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  14  *
  15  *  This file contains the low-level support and setup for the
  16  *  PowerPC-64 platform, including trap and interrupt dispatch.
  17  *
  18  *  This program is free software; you can redistribute it and/or
  19  *  modify it under the terms of the GNU General Public License
  20  *  as published by the Free Software Foundation; either version
  21  *  2 of the License, or (at your option) any later version.
  22  */
  23
  24 #include <linux/threads.h>
  25 #include <asm/reg.h>
  26 #include <asm/page.h>
  27 #include <asm/mmu.h>
  28 #include <asm/ppc_asm.h>
  29 #include <asm/asm-offsets.h>
  30 #include <asm/bug.h>
  31 #include <asm/cputable.h>
  32 #include <asm/setup.h>
  33 #include <asm/hvcall.h>
  34 #include <asm/iseries/lpar_map.h>
  35 #include <asm/thread_info.h>
  36 #include <asm/firmware.h>
  37
  38 #define DO_SOFT_DISABLE
  39
  40 /*
  41  * We layout physical memory as follows:
  42  * 0x0000 - 0x00ff : Secondary processor spin code
  43  * 0x0100 - 0x2fff : pSeries Interrupt prologs
  44  * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs
  45  * 0x6000 - 0x6fff : Initial (CPU0) segment table
  46  * 0x7000 - 0x7fff : FWNMI data area
  47  * 0x8000 -        : Early init and support code
  48  */
  49
  50 /*
  51  *   SPRG Usage
  52  *
  53  *   Register   Definition
  54  *
  55  *   SPRG0      reserved for hypervisor
  56  *   SPRG1      temp - used to save gpr
  57  *   SPRG2      temp - used to save gpr
  58  *   SPRG3      virt addr of paca
  59  */
  60
  61 /*
  62  * Entering into this code we make the following assumptions:
  63  *  For pSeries:
  64  *   1. The MMU is off & open firmware is running in real mode.
  65  *   2. The kernel is entered at __start
  66  *
  67  *  For iSeries:
  68  *   1. The MMU is on (as it always is for iSeries)
  69  *   2. The kernel is entered at system_reset_iSeries
  70  */
  71
  72         .text
  73         .globl  _stext
  74 _stext:
  75 _GLOBAL(__start)
  76         /* NOP this out unconditionally */
  77 BEGIN_FTR_SECTION
  78         b       .__start_initialization_multiplatform
  79 END_FTR_SECTION(0, 1)
  80
  81         /* Catch branch to 0 in real mode */
  82         trap
  83
  84         /* Secondary processors spin on this value until it goes to 1. */
  85         .globl  __secondary_hold_spinloop
  86 __secondary_hold_spinloop:
  87         .llong  0x0
  88
  89         /* Secondary processors write this value with their cpu # */
  90         /* after they enter the spin loop immediately below.      */
  91         .globl  __secondary_hold_acknowledge
  92 __secondary_hold_acknowledge:
  93         .llong  0x0
  94
  95 #ifdef CONFIG_PPC_ISERIES
  96         /*
  97          * At offset 0x20, there is a pointer to iSeries LPAR data.
  98          * This is required by the hypervisor
  99          */
 100         . = 0x20
 101         .llong hvReleaseData-KERNELBASE
 102 #endif /* CONFIG_PPC_ISERIES */
 103
 104         . = 0x60
 105 /*
 106  * The following code is used to hold secondary processors
 107  * in a spin loop after they have entered the kernel, but
 108  * before the bulk of the kernel has been relocated.  This code
 109  * is relocated to physical address 0x60 before prom_init is run.
 110  * All of it must fit below the first exception vector at 0x100.
 111  */
 112 _GLOBAL(__secondary_hold)
 113         mfmsr   r24
 114         ori     r24,r24,MSR_RI
 115         mtmsrd  r24                     /* RI on */
 116
 117         /* Grab our physical cpu number */
 118         mr      r24,r3
 119
 120         /* Tell the master cpu we're here */
 121         /* Relocation is off & we are located at an address less */
 122         /* than 0x100, so only need to grab low order offset.    */
 123         std     r24,__secondary_hold_acknowledge@l(0)
 124         sync
 125
 126         /* All secondary cpus wait here until told to start. */
 127 100:    ld      r4,__secondary_hold_spinloop@l(0)
 128         cmpdi   0,r4,1
 129         bne     100b
 130
 131 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
 132         LOAD_REG_IMMEDIATE(r4, .generic_secondary_smp_init)
 133         mtctr   r4
 134         mr      r3,r24
 135         bctr
 136 #else
 137         BUG_OPCODE
 138 #endif
 139
 140 /* This value is used to mark exception frames on the stack. */
 141         .section ".toc","aw"
 142 exception_marker:
 143         .tc     ID_72656773_68657265[TC],0x7265677368657265
 144         .text
 145
 146 /*
 147  * The following macros define the code that appears as
 148  * the prologue to each of the exception handlers.  They
 149  * are split into two parts to allow a single kernel binary
 150  * to be used for pSeries and iSeries.
 151  * LOL.  One day... - paulus
 152  */
 153
 154 /*
 155  * We make as much of the exception code common between native
 156  * exception handlers (including pSeries LPAR) and iSeries LPAR
 157  * implementations as possible.
 158  */
 159
 160 /*
 161  * This is the start of the interrupt handlers for pSeries
 162  * This code runs with relocation off.
 163  */
 164 #define EX_R9           0
 165 #define EX_R10          8
 166 #define EX_R11          16
 167 #define EX_R12          24
 168 #define EX_R13          32
 169 #define EX_SRR0         40
 170 #define EX_DAR          48
 171 #define EX_DSISR        56
 172 #define EX_CCR          60
 173 #define EX_R3           64
 174 #define EX_LR           72
 175
 176 /*
 177  * We're short on space and time in the exception prolog, so we can't
 178  * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
 179  * low halfword of the address, but for Kdump we need the whole low
 180  * word.
 181  */
 182 #ifdef CONFIG_CRASH_DUMP
 183 #define LOAD_HANDLER(reg, label)                                        \
 184         oris    reg,reg,(label)@h;      /* virt addr of handler ... */  \
 185         ori     reg,reg,(label)@l;      /* .. and the rest */
 186 #else
 187 #define LOAD_HANDLER(reg, label)                                        \
 188         ori     reg,reg,(label)@l;      /* virt addr of handler ... */
 189 #endif
 190
 191 /*
 192  * Equal to EXCEPTION_PROLOG_PSERIES, except that it forces 64bit mode.
 193  * The firmware calls the registered system_reset_fwnmi and
 194  * machine_check_fwnmi handlers in 32bit mode if the cpu happens to run
 195  * a 32bit application at the time of the event.
 196  * This firmware bug is present on POWER4 and JS20.
 197  */
 198 #define EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(area, label)               \
 199         mfspr   r13,SPRN_SPRG3;         /* get paca address into r13 */ \
 200         std     r9,area+EX_R9(r13);     /* save r9 - r12 */             \
 201         std     r10,area+EX_R10(r13);                                   \
 202         std     r11,area+EX_R11(r13);                                   \
 203         std     r12,area+EX_R12(r13);                                   \
 204         mfspr   r9,SPRN_SPRG1;                                          \
 205         std     r9,area+EX_R13(r13);                                    \
 206         mfcr    r9;                                                     \
 207         clrrdi  r12,r13,32;             /* get high part of &label */   \
 208         mfmsr   r10;                                                    \
 209         /* force 64bit mode */                                          \
 210         li      r11,5;                  /* MSR_SF_LG|MSR_ISF_LG */      \
 211         rldimi  r10,r11,61,0;           /* insert into top 3 bits */    \
 212         /* done 64bit mode */                                           \
 213         mfspr   r11,SPRN_SRR0;          /* save SRR0 */                 \
 214         LOAD_HANDLER(r12,label)                                         \
 215         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI;                           \
 216         mtspr   SPRN_SRR0,r12;                                          \
 217         mfspr   r12,SPRN_SRR1;          /* and SRR1 */                  \
 218         mtspr   SPRN_SRR1,r10;                                          \
 219         rfid;                                                           \
 220         b       .       /* prevent speculative execution */
 221
 222 #define EXCEPTION_PROLOG_PSERIES(area, label)                           \
 223         mfspr   r13,SPRN_SPRG3;         /* get paca address into r13 */ \
 224         std     r9,area+EX_R9(r13);     /* save r9 - r12 */             \
 225         std     r10,area+EX_R10(r13);                                   \
 226         std     r11,area+EX_R11(r13);                                   \
 227         std     r12,area+EX_R12(r13);                                   \
 228         mfspr   r9,SPRN_SPRG1;                                          \
 229         std     r9,area+EX_R13(r13);                                    \
 230         mfcr    r9;                                                     \
 231         clrrdi  r12,r13,32;             /* get high part of &label */   \
 232         mfmsr   r10;                                                    \
 233         mfspr   r11,SPRN_SRR0;          /* save SRR0 */                 \
 234         LOAD_HANDLER(r12,label)                                         \
 235         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI;                           \
 236         mtspr   SPRN_SRR0,r12;                                          \
 237         mfspr   r12,SPRN_SRR1;          /* and SRR1 */                  \
 238         mtspr   SPRN_SRR1,r10;                                          \
 239         rfid;                                                           \
 240         b       .       /* prevent speculative execution */
 241
 242 /*
 243  * This is the start of the interrupt handlers for iSeries
 244  * This code runs with relocation on.
 245  */
 246 #define EXCEPTION_PROLOG_ISERIES_1(area)                                \
 247         mfspr   r13,SPRN_SPRG3;         /* get paca address into r13 */ \
 248         std     r9,area+EX_R9(r13);     /* save r9 - r12 */             \
 249         std     r10,area+EX_R10(r13);                                   \
 250         std     r11,area+EX_R11(r13);                                   \
 251         std     r12,area+EX_R12(r13);                                   \
 252         mfspr   r9,SPRN_SPRG1;                                          \
 253         std     r9,area+EX_R13(r13);                                    \
 254         mfcr    r9
 255
 256 #define EXCEPTION_PROLOG_ISERIES_2                                      \
 257         mfmsr   r10;                                                    \
 258         ld      r12,PACALPPACAPTR(r13);                                 \
 259         ld      r11,LPPACASRR0(r12);                                    \
 260         ld      r12,LPPACASRR1(r12);                                    \
 261         ori     r10,r10,MSR_RI;                                         \
 262         mtmsrd  r10,1
 263
 264 /*
 265  * The common exception prolog is used for all except a few exceptions
 266  * such as a segment miss on a kernel address.  We have to be prepared
 267  * to take another exception from the point where we first touch the
 268  * kernel stack onwards.
 269  *
 270  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 271  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 272  * SRR1, and relocation is on.
 273  */
 274 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 275         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 276         mr      r10,r1;                 /* Save r1                      */ \
 277         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 278         beq-    1f;                                                        \
 279         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 280 1:      cmpdi   cr1,r1,0;               /* check if r1 is in userspace  */ \
 281         bge-    cr1,2f;                 /* abort if it is               */ \
 282         b       3f;                                                        \
 283 2:      li      r1,(n);                 /* will be reloaded later       */ \
 284         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 285         b       bad_stack;                                                 \
 286 3:      std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 287         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 288         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 289         std     r10,0(r1);              /* make stack chain pointer     */ \
 290         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 291         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 292         ACCOUNT_CPU_USER_ENTRY(r9, r10);                                   \
 293         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 294         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 295         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 296         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 297         ld      r10,area+EX_R10(r13);                                      \
 298         std     r9,GPR9(r1);                                               \
 299         std     r10,GPR10(r1);                                             \
 300         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 301         ld      r10,area+EX_R12(r13);                                      \
 302         ld      r11,area+EX_R13(r13);                                      \
 303         std     r9,GPR11(r1);                                              \
 304         std     r10,GPR12(r1);                                             \
 305         std     r11,GPR13(r1);                                             \
 306         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 307         mflr    r9;                     /* save LR in stackframe        */ \
 308         std     r9,_LINK(r1);                                              \
 309         mfctr   r10;                    /* save CTR in stackframe       */ \
 310         std     r10,_CTR(r1);                                              \
 311         lbz     r10,PACASOFTIRQEN(r13);                            \
 312         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 313         std     r10,SOFTE(r1);                                             \
 314         std     r11,_XER(r1);                                              \
 315         li      r9,(n)+1;                                                  \
 316         std     r9,_TRAP(r1);           /* set trap number              */ \
 317         li      r10,0;                                                     \
 318         ld      r11,exception_marker@toc(r2);                              \
 319         std     r10,RESULT(r1);         /* clear regs->result           */ \
 320         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 321
 322 /*
 323  * Exception vectors.
 324  */
 325 #define STD_EXCEPTION_PSERIES(n, label)                 \
 326         . = n;                                          \
 327         .globl label##_pSeries;                         \
 328 label##_pSeries:                                        \
 329         HMT_MEDIUM;                                     \
 330         mtspr   SPRN_SPRG1,r13;         /* save r13 */  \
 331         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
 332
 333 #define HSTD_EXCEPTION_PSERIES(n, label)                \
 334         . = n;                                          \
 335         .globl label##_pSeries;                         \
 336 label##_pSeries:                                        \
 337         HMT_MEDIUM;                                     \
 338         mtspr   SPRN_SPRG1,r20;         /* save r20 */  \
 339         mfspr   r20,SPRN_HSRR0;         /* copy HSRR0 to SRR0 */ \
 340         mtspr   SPRN_SRR0,r20;                          \
 341         mfspr   r20,SPRN_HSRR1;         /* copy HSRR0 to SRR0 */ \
 342         mtspr   SPRN_SRR1,r20;                          \
 343         mfspr   r20,SPRN_SPRG1;         /* restore r20 */ \
 344         mtspr   SPRN_SPRG1,r13;         /* save r13 */  \
 345         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
 346
 347
 348 #define MASKABLE_EXCEPTION_PSERIES(n, label)                            \
 349         . = n;                                                          \
 350         .globl label##_pSeries;                                         \
 351 label##_pSeries:                                                        \
 352         HMT_MEDIUM;                                                     \
 353         mtspr   SPRN_SPRG1,r13;         /* save r13 */                  \
 354         mfspr   r13,SPRN_SPRG3;         /* get paca address into r13 */ \
 355         std     r9,PACA_EXGEN+EX_R9(r13);       /* save r9, r10 */      \
 356         std     r10,PACA_EXGEN+EX_R10(r13);                             \
 357         lbz     r10,PACASOFTIRQEN(r13);                                 \
 358         mfcr    r9;                                                     \
 359         cmpwi   r10,0;                                                  \
 360         beq     masked_interrupt;                                       \
 361         mfspr   r10,SPRN_SPRG1;                                         \
 362         std     r10,PACA_EXGEN+EX_R13(r13);                             \
 363         std     r11,PACA_EXGEN+EX_R11(r13);                             \
 364         std     r12,PACA_EXGEN+EX_R12(r13);                             \
 365         clrrdi  r12,r13,32;             /* get high part of &label */   \
 366         mfmsr   r10;                                                    \
 367         mfspr   r11,SPRN_SRR0;          /* save SRR0 */                 \
 368         LOAD_HANDLER(r12,label##_common)                                \
 369         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI;                           \
 370         mtspr   SPRN_SRR0,r12;                                          \
 371         mfspr   r12,SPRN_SRR1;          /* and SRR1 */                  \
 372         mtspr   SPRN_SRR1,r10;                                          \
 373         rfid;                                                           \
 374         b       .       /* prevent speculative execution */
 375
 376 #define STD_EXCEPTION_ISERIES(n, label, area)           \
 377         .globl label##_iSeries;                         \
 378 label##_iSeries:                                        \
 379         HMT_MEDIUM;                                     \
 380         mtspr   SPRN_SPRG1,r13;         /* save r13 */  \
 381         EXCEPTION_PROLOG_ISERIES_1(area);               \
 382         EXCEPTION_PROLOG_ISERIES_2;                     \
 383         b       label##_common
 384
 385 #define MASKABLE_EXCEPTION_ISERIES(n, label)                            \
 386         .globl label##_iSeries;                                         \
 387 label##_iSeries:                                                        \
 388         HMT_MEDIUM;                                                     \
 389         mtspr   SPRN_SPRG1,r13;         /* save r13 */                  \
 390         EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN);                         \
 391         lbz     r10,PACASOFTIRQEN(r13);                                 \
 392         cmpwi   0,r10,0;                                                \
 393         beq-    label##_iSeries_masked;                                 \
 394         EXCEPTION_PROLOG_ISERIES_2;                                     \
 395         b       label##_common;                                         \
 396
 397 #ifdef CONFIG_PPC_ISERIES
 398 #define DISABLE_INTS                            \
 399         li      r11,0;                          \
 400         stb     r11,PACASOFTIRQEN(r13);         \
 401 BEGIN_FW_FTR_SECTION;                           \
 402         stb     r11,PACAHARDIRQEN(r13);         \
 403 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES);   \
 404 BEGIN_FW_FTR_SECTION;                           \
 405         mfmsr   r10;                            \
 406         ori     r10,r10,MSR_EE;                 \
 407         mtmsrd  r10,1;                          \
 408 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
 409
 410 #else
 411 #define DISABLE_INTS                            \
 412         li      r11,0;                          \
 413         stb     r11,PACASOFTIRQEN(r13);         \
 414         stb     r11,PACAHARDIRQEN(r13)
 415
 416 #endif /* CONFIG_PPC_ISERIES */
 417
 418 #define ENABLE_INTS                             \
 419         ld      r12,_MSR(r1);                   \
 420         mfmsr   r11;                            \
 421         rlwimi  r11,r12,0,MSR_EE;               \
 422         mtmsrd  r11,1
 423
 424 #define STD_EXCEPTION_COMMON(trap, label, hdlr)         \
 425         .align  7;                                      \
 426         .globl label##_common;                          \
 427 label##_common:                                         \
 428         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
 429         DISABLE_INTS;                                   \
 430         bl      .save_nvgprs;                           \
 431         addi    r3,r1,STACK_FRAME_OVERHEAD;             \
 432         bl      hdlr;                                   \
 433         b       .ret_from_except
 434
 435 /*
 436  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 437  * in the idle task and therefore need the special idle handling.
 438  */
 439 #define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr)    \
 440         .align  7;                                      \
 441         .globl label##_common;                          \
 442 label##_common:                                         \
 443         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
 444         FINISH_NAP;                                     \
 445         DISABLE_INTS;                                   \
 446         bl      .save_nvgprs;                           \
 447         addi    r3,r1,STACK_FRAME_OVERHEAD;             \
 448         bl      hdlr;                                   \
 449         b       .ret_from_except
 450
 451 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr)    \
 452         .align  7;                                      \
 453         .globl label##_common;                          \
 454 label##_common:                                         \
 455         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
 456         FINISH_NAP;                                     \
 457         DISABLE_INTS;                                   \
 458         bl      .ppc64_runlatch_on;                     \
 459         addi    r3,r1,STACK_FRAME_OVERHEAD;             \
 460         bl      hdlr;                                   \
 461         b       .ret_from_except_lite
 462
 463 /*
 464  * When the idle code in power4_idle puts the CPU into NAP mode,
 465  * it has to do so in a loop, and relies on the external interrupt
 466  * and decrementer interrupt entry code to get it out of the loop.
 467  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 468  * to signal that it is in the loop and needs help to get out.
 469  */
 470 #ifdef CONFIG_PPC_970_NAP
 471 #define FINISH_NAP                              \
 472 BEGIN_FTR_SECTION                               \
 473         clrrdi  r11,r1,THREAD_SHIFT;            \
 474         ld      r9,TI_LOCAL_FLAGS(r11);         \
 475         andi.   r10,r9,_TLF_NAPPING;            \
 476         bnel    power4_fixup_nap;               \
 477 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 478 #else
 479 #define FINISH_NAP
 480 #endif
 481
 482 /*
 483  * Start of pSeries system interrupt routines
 484  */
 485         . = 0x100
 486         .globl __start_interrupts
 487 __start_interrupts:
 488
 489         STD_EXCEPTION_PSERIES(0x100, system_reset)
 490
 491         . = 0x200
 492 _machine_check_pSeries:
 493         HMT_MEDIUM
 494         mtspr   SPRN_SPRG1,r13          /* save r13 */
 495         EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
 496
 497         . = 0x300
 498         .globl data_access_pSeries
 499 data_access_pSeries:
 500         HMT_MEDIUM
 501         mtspr   SPRN_SPRG1,r13
 502 BEGIN_FTR_SECTION
 503         mtspr   SPRN_SPRG2,r12
 504         mfspr   r13,SPRN_DAR
 505         mfspr   r12,SPRN_DSISR
 506         srdi    r13,r13,60
 507         rlwimi  r13,r12,16,0x20
 508         mfcr    r12
 509         cmpwi   r13,0x2c
 510         beq     do_stab_bolted_pSeries
 511         mtcrf   0x80,r12
 512         mfspr   r12,SPRN_SPRG2
 513 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
 514         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
 515
 516         . = 0x380
 517         .globl data_access_slb_pSeries
 518 data_access_slb_pSeries:
 519         HMT_MEDIUM
 520         mtspr   SPRN_SPRG1,r13
 521         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
 522         std     r3,PACA_EXSLB+EX_R3(r13)
 523         mfspr   r3,SPRN_DAR
 524         std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
 525         mfcr    r9
 526 #ifdef __DISABLED__
 527         /* Keep that around for when we re-implement dynamic VSIDs */
 528         cmpdi   r3,0
 529         bge     slb_miss_user_pseries
 530 #endif /* __DISABLED__ */
 531         std     r10,PACA_EXSLB+EX_R10(r13)
 532         std     r11,PACA_EXSLB+EX_R11(r13)
 533         std     r12,PACA_EXSLB+EX_R12(r13)
 534         mfspr   r10,SPRN_SPRG1
 535         std     r10,PACA_EXSLB+EX_R13(r13)
 536         mfspr   r12,SPRN_SRR1           /* and SRR1 */
 537         b       .slb_miss_realmode      /* Rel. branch works in real mode */
 538
 539         STD_EXCEPTION_PSERIES(0x400, instruction_access)
 540
 541         . = 0x480
 542         .globl instruction_access_slb_pSeries
 543 instruction_access_slb_pSeries:
 544         HMT_MEDIUM
 545         mtspr   SPRN_SPRG1,r13
 546         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
 547         std     r3,PACA_EXSLB+EX_R3(r13)
 548         mfspr   r3,SPRN_SRR0            /* SRR0 is faulting address */
 549         std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
 550         mfcr    r9
 551 #ifdef __DISABLED__
 552         /* Keep that around for when we re-implement dynamic VSIDs */
 553         cmpdi   r3,0
 554         bge     slb_miss_user_pseries
 555 #endif /* __DISABLED__ */
 556         std     r10,PACA_EXSLB+EX_R10(r13)
 557         std     r11,PACA_EXSLB+EX_R11(r13)
 558         std     r12,PACA_EXSLB+EX_R12(r13)
 559         mfspr   r10,SPRN_SPRG1
 560         std     r10,PACA_EXSLB+EX_R13(r13)
 561         mfspr   r12,SPRN_SRR1           /* and SRR1 */
 562         b       .slb_miss_realmode      /* Rel. branch works in real mode */
 563
 564         MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt)
 565         STD_EXCEPTION_PSERIES(0x600, alignment)
 566         STD_EXCEPTION_PSERIES(0x700, program_check)
 567         STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
 568         MASKABLE_EXCEPTION_PSERIES(0x900, decrementer)
 569         STD_EXCEPTION_PSERIES(0xa00, trap_0a)
 570         STD_EXCEPTION_PSERIES(0xb00, trap_0b)
 571
 572         . = 0xc00
 573         .globl  system_call_pSeries
 574 system_call_pSeries:
 575         HMT_MEDIUM
 576         mr      r9,r13
 577         mfmsr   r10
 578         mfspr   r13,SPRN_SPRG3
 579         mfspr   r11,SPRN_SRR0
 580         clrrdi  r12,r13,32
 581         oris    r12,r12,system_call_common@h
 582         ori     r12,r12,system_call_common@l
 583         mtspr   SPRN_SRR0,r12
 584         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI
 585         mfspr   r12,SPRN_SRR1
 586         mtspr   SPRN_SRR1,r10
 587         rfid
 588         b       .       /* prevent speculative execution */
 589
 590         STD_EXCEPTION_PSERIES(0xd00, single_step)
 591         STD_EXCEPTION_PSERIES(0xe00, trap_0e)
 592
 593         /* We need to deal with the Altivec unavailable exception
 594          * here which is at 0xf20, thus in the middle of the
 595          * prolog code of the PerformanceMonitor one. A little
 596          * trickery is thus necessary
 597          */
 598         . = 0xf00
 599         b       performance_monitor_pSeries
 600
 601         STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
 602
 603 #ifdef CONFIG_CBE_RAS
 604         HSTD_EXCEPTION_PSERIES(0x1200, cbe_system_error)
 605 #endif /* CONFIG_CBE_RAS */
 606         STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
 607 #ifdef CONFIG_CBE_RAS
 608         HSTD_EXCEPTION_PSERIES(0x1600, cbe_maintenance)
 609 #endif /* CONFIG_CBE_RAS */
 610         STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
 611 #ifdef CONFIG_CBE_RAS
 612         HSTD_EXCEPTION_PSERIES(0x1800, cbe_thermal)
 613 #endif /* CONFIG_CBE_RAS */
 614
 615         . = 0x3000
 616
 617 /*** pSeries interrupt support ***/
 618
 619         /* moved from 0xf00 */
 620         STD_EXCEPTION_PSERIES(., performance_monitor)
 621
 622 /*
 623  * An interrupt came in while soft-disabled; clear EE in SRR1,
 624  * clear paca->hard_enabled and return.
 625  */
 626 masked_interrupt:
 627         stb     r10,PACAHARDIRQEN(r13)
 628         mtcrf   0x80,r9
 629         ld      r9,PACA_EXGEN+EX_R9(r13)
 630         mfspr   r10,SPRN_SRR1
 631         rldicl  r10,r10,48,1            /* clear MSR_EE */
 632         rotldi  r10,r10,16
 633         mtspr   SPRN_SRR1,r10
 634         ld      r10,PACA_EXGEN+EX_R10(r13)
 635         mfspr   r13,SPRN_SPRG1
 636         rfid
 637         b       .
 638
 639         .align  7
 640 do_stab_bolted_pSeries:
 641         mtcrf   0x80,r12
 642         mfspr   r12,SPRN_SPRG2
 643         EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
 644
 645 /*
 646  * We have some room here  we use that to put
 647  * the peries slb miss user trampoline code so it's reasonably
 648  * away from slb_miss_user_common to avoid problems with rfid
 649  *
 650  * This is used for when the SLB miss handler has to go virtual,
 651  * which doesn't happen for now anymore but will once we re-implement
 652  * dynamic VSIDs for shared page tables
 653  */
 654 #ifdef __DISABLED__
 655 slb_miss_user_pseries:
 656         std     r10,PACA_EXGEN+EX_R10(r13)
 657         std     r11,PACA_EXGEN+EX_R11(r13)
 658         std     r12,PACA_EXGEN+EX_R12(r13)
 659         mfspr   r10,SPRG1
 660         ld      r11,PACA_EXSLB+EX_R9(r13)
 661         ld      r12,PACA_EXSLB+EX_R3(r13)
 662         std     r10,PACA_EXGEN+EX_R13(r13)
 663         std     r11,PACA_EXGEN+EX_R9(r13)
 664         std     r12,PACA_EXGEN+EX_R3(r13)
 665         clrrdi  r12,r13,32
 666         mfmsr   r10
 667         mfspr   r11,SRR0                        /* save SRR0 */
 668         ori     r12,r12,slb_miss_user_common@l  /* virt addr of handler */
 669         ori     r10,r10,MSR_IR|MSR_DR|MSR_RI
 670         mtspr   SRR0,r12
 671         mfspr   r12,SRR1                        /* and SRR1 */
 672         mtspr   SRR1,r10
 673         rfid
 674         b       .                               /* prevent spec. execution */
 675 #endif /* __DISABLED__ */
 676
 677 /*
 678  * Vectors for the FWNMI option.  Share common code.
 679  */
 680         .globl system_reset_fwnmi
 681       .align 7
 682 system_reset_fwnmi:
 683         HMT_MEDIUM
 684         mtspr   SPRN_SPRG1,r13          /* save r13 */
 685         EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXGEN, system_reset_common)
 686
 687         .globl machine_check_fwnmi
 688       .align 7
 689 machine_check_fwnmi:
 690         HMT_MEDIUM
 691         mtspr   SPRN_SPRG1,r13          /* save r13 */
 692         EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXMC, machine_check_common)
 693
 694 #ifdef CONFIG_PPC_ISERIES
 695 /***  ISeries-LPAR interrupt handlers ***/
 696
 697         STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
 698
 699         .globl data_access_iSeries
 700 data_access_iSeries:
 701         mtspr   SPRN_SPRG1,r13
 702 BEGIN_FTR_SECTION
 703         mtspr   SPRN_SPRG2,r12
 704         mfspr   r13,SPRN_DAR
 705         mfspr   r12,SPRN_DSISR
 706         srdi    r13,r13,60
 707         rlwimi  r13,r12,16,0x20
 708         mfcr    r12
 709         cmpwi   r13,0x2c
 710         beq     .do_stab_bolted_iSeries
 711         mtcrf   0x80,r12
 712         mfspr   r12,SPRN_SPRG2
 713 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
 714         EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
 715         EXCEPTION_PROLOG_ISERIES_2
 716         b       data_access_common
 717
 718 .do_stab_bolted_iSeries:
 719         mtcrf   0x80,r12
 720         mfspr   r12,SPRN_SPRG2
 721         EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
 722         EXCEPTION_PROLOG_ISERIES_2
 723         b       .do_stab_bolted
 724
 725         .globl  data_access_slb_iSeries
 726 data_access_slb_iSeries:
 727         mtspr   SPRN_SPRG1,r13          /* save r13 */
 728         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
 729         std     r3,PACA_EXSLB+EX_R3(r13)
 730         mfspr   r3,SPRN_DAR
 731         std     r9,PACA_EXSLB+EX_R9(r13)
 732         mfcr    r9
 733 #ifdef __DISABLED__
 734         cmpdi   r3,0
 735         bge     slb_miss_user_iseries
 736 #endif
 737         std     r10,PACA_EXSLB+EX_R10(r13)
 738         std     r11,PACA_EXSLB+EX_R11(r13)
 739         std     r12,PACA_EXSLB+EX_R12(r13)
 740         mfspr   r10,SPRN_SPRG1
 741         std     r10,PACA_EXSLB+EX_R13(r13)
 742         ld      r12,PACALPPACAPTR(r13)
 743         ld      r12,LPPACASRR1(r12)
 744         b       .slb_miss_realmode
 745
 746         STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
 747
 748         .globl  instruction_access_slb_iSeries
 749 instruction_access_slb_iSeries:
 750         mtspr   SPRN_SPRG1,r13          /* save r13 */
 751         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
 752         std     r3,PACA_EXSLB+EX_R3(r13)
 753         ld      r3,PACALPPACAPTR(r13)
 754         ld      r3,LPPACASRR0(r3)       /* get SRR0 value */
 755         std     r9,PACA_EXSLB+EX_R9(r13)
 756         mfcr    r9
 757 #ifdef __DISABLED__
 758         cmpdi   r3,0
 759         bge     .slb_miss_user_iseries
 760 #endif
 761         std     r10,PACA_EXSLB+EX_R10(r13)
 762         std     r11,PACA_EXSLB+EX_R11(r13)
 763         std     r12,PACA_EXSLB+EX_R12(r13)
 764         mfspr   r10,SPRN_SPRG1
 765         std     r10,PACA_EXSLB+EX_R13(r13)
 766         ld      r12,PACALPPACAPTR(r13)
 767         ld      r12,LPPACASRR1(r12)
 768         b       .slb_miss_realmode
 769
 770 #ifdef __DISABLED__
 771 slb_miss_user_iseries:
 772         std     r10,PACA_EXGEN+EX_R10(r13)
 773         std     r11,PACA_EXGEN+EX_R11(r13)
 774         std     r12,PACA_EXGEN+EX_R12(r13)
 775         mfspr   r10,SPRG1
 776         ld      r11,PACA_EXSLB+EX_R9(r13)
 777         ld      r12,PACA_EXSLB+EX_R3(r13)
 778         std     r10,PACA_EXGEN+EX_R13(r13)
 779         std     r11,PACA_EXGEN+EX_R9(r13)
 780         std     r12,PACA_EXGEN+EX_R3(r13)
 781         EXCEPTION_PROLOG_ISERIES_2
 782         b       slb_miss_user_common
 783 #endif
 784
 785         MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
 786         STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
 787         STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
 788         STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
 789         MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
 790         STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
 791         STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
 792
 793         .globl  system_call_iSeries
 794 system_call_iSeries:
 795         mr      r9,r13
 796         mfspr   r13,SPRN_SPRG3
 797         EXCEPTION_PROLOG_ISERIES_2
 798         b       system_call_common
 799
 800         STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
 801         STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
 802         STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
 803
 804         .globl system_reset_iSeries
 805 system_reset_iSeries:
 806         mfspr   r13,SPRN_SPRG3          /* Get paca address */
 807         mfmsr   r24
 808         ori     r24,r24,MSR_RI
 809         mtmsrd  r24                     /* RI on */
 810         lhz     r24,PACAPACAINDEX(r13)  /* Get processor # */
 811         cmpwi   0,r24,0                 /* Are we processor 0? */
 812         bne     1f
 813         b       .__start_initialization_iSeries /* Start up the first processor */
 814 1:      mfspr   r4,SPRN_CTRLF
 815         li      r5,CTRL_RUNLATCH        /* Turn off the run light */
 816         andc    r4,r4,r5
 817         mtspr   SPRN_CTRLT,r4
 818
 819 1:
 820         HMT_LOW
 821 #ifdef CONFIG_SMP
 822         lbz     r23,PACAPROCSTART(r13)  /* Test if this processor
 823                                          * should start */
 824         sync
 825         LOAD_REG_IMMEDIATE(r3,current_set)
 826         sldi    r28,r24,3               /* get current_set[cpu#] */
 827         ldx     r3,r3,r28
 828         addi    r1,r3,THREAD_SIZE
 829         subi    r1,r1,STACK_FRAME_OVERHEAD
 830
 831         cmpwi   0,r23,0
 832         beq     iSeries_secondary_smp_loop      /* Loop until told to go */
 833         bne     __secondary_start               /* Loop until told to go */
 834 iSeries_secondary_smp_loop:
 835         /* Let the Hypervisor know we are alive */
 836         /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
 837         lis     r3,0x8002
 838         rldicr  r3,r3,32,15             /* r0 = (r3 << 32) & 0xffff000000000000 */
 839 #else /* CONFIG_SMP */
 840         /* Yield the processor.  This is required for non-SMP kernels
 841                 which are running on multi-threaded machines. */
 842         lis     r3,0x8000
 843         rldicr  r3,r3,32,15             /* r3 = (r3 << 32) & 0xffff000000000000 */
 844         addi    r3,r3,18                /* r3 = 0x8000000000000012 which is "yield" */
 845         li      r4,0                    /* "yield timed" */
 846         li      r5,-1                   /* "yield forever" */
 847 #endif /* CONFIG_SMP */
 848         li      r0,-1                   /* r0=-1 indicates a Hypervisor call */
 849         sc                              /* Invoke the hypervisor via a system call */
 850         mfspr   r13,SPRN_SPRG3          /* Put r13 back ???? */
 851         b       1b                      /* If SMP not configured, secondaries
 852                                          * loop forever */
 853
 854 decrementer_iSeries_masked:
 855         /* We may not have a valid TOC pointer in here. */
 856         li      r11,1
 857         ld      r12,PACALPPACAPTR(r13)
 858         stb     r11,LPPACADECRINT(r12)
 859         LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy)
 860         lwz     r12,0(r12)
 861         mtspr   SPRN_DEC,r12
 862         /* fall through */
 863
 864 hardware_interrupt_iSeries_masked:
 865         mtcrf   0x80,r9         /* Restore regs */
 866         ld      r12,PACALPPACAPTR(r13)
 867         ld      r11,LPPACASRR0(r12)
 868         ld      r12,LPPACASRR1(r12)
 869         mtspr   SPRN_SRR0,r11
 870         mtspr   SPRN_SRR1,r12
 871         ld      r9,PACA_EXGEN+EX_R9(r13)
 872         ld      r10,PACA_EXGEN+EX_R10(r13)
 873         ld      r11,PACA_EXGEN+EX_R11(r13)
 874         ld      r12,PACA_EXGEN+EX_R12(r13)
 875         ld      r13,PACA_EXGEN+EX_R13(r13)
 876         rfid
 877         b       .       /* prevent speculative execution */
 878 #endif /* CONFIG_PPC_ISERIES */
 879
 880 /*** Common interrupt handlers ***/
 881
 882         STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
 883
 884         /*
 885          * Machine check is different because we use a different
 886          * save area: PACA_EXMC instead of PACA_EXGEN.
 887          */
 888         .align  7
 889         .globl machine_check_common
 890 machine_check_common:
 891         EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
 892         FINISH_NAP
 893         DISABLE_INTS
 894         bl      .save_nvgprs
 895         addi    r3,r1,STACK_FRAME_OVERHEAD
 896         bl      .machine_check_exception
 897         b       .ret_from_except
 898
 899         STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt)
 900         STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
 901         STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
 902         STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
 903         STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
 904         STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception)
 905         STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
 906 #ifdef CONFIG_ALTIVEC
 907         STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
 908 #else
 909         STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
 910 #endif
 911 #ifdef CONFIG_CBE_RAS
 912         STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
 913         STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
 914         STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
 915 #endif /* CONFIG_CBE_RAS */
 916
 917 /*
 918  * Here we have detected that the kernel stack pointer is bad.
 919  * R9 contains the saved CR, r13 points to the paca,
 920  * r10 contains the (bad) kernel stack pointer,
 921  * r11 and r12 contain the saved SRR0 and SRR1.
 922  * We switch to using an emergency stack, save the registers there,
 923  * and call kernel_bad_stack(), which panics.
 924  */
 925 bad_stack:
 926         ld      r1,PACAEMERGSP(r13)
 927         subi    r1,r1,64+INT_FRAME_SIZE
 928         std     r9,_CCR(r1)
 929         std     r10,GPR1(r1)
 930         std     r11,_NIP(r1)
 931         std     r12,_MSR(r1)
 932         mfspr   r11,SPRN_DAR
 933         mfspr   r12,SPRN_DSISR
 934         std     r11,_DAR(r1)
 935         std     r12,_DSISR(r1)
 936         mflr    r10
 937         mfctr   r11
 938         mfxer   r12
 939         std     r10,_LINK(r1)
 940         std     r11,_CTR(r1)
 941         std     r12,_XER(r1)
 942         SAVE_GPR(0,r1)
 943         SAVE_GPR(2,r1)
 944         SAVE_4GPRS(3,r1)
 945         SAVE_2GPRS(7,r1)
 946         SAVE_10GPRS(12,r1)
 947         SAVE_10GPRS(22,r1)
 948         lhz     r12,PACA_TRAP_SAVE(r13)
 949         std     r12,_TRAP(r1)
 950         addi    r11,r1,INT_FRAME_SIZE
 951         std     r11,0(r1)
 952         li      r12,0
 953         std     r12,0(r11)
 954         ld      r2,PACATOC(r13)
 955 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
 956         bl      .kernel_bad_stack
 957         b       1b
 958
 959 /*
 960  * Return from an exception with minimal checks.
 961  * The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
 962  * If interrupts have been enabled, or anything has been
 963  * done that might have changed the scheduling status of
 964  * any task or sent any task a signal, you should use
 965  * ret_from_except or ret_from_except_lite instead of this.
 966  */
 967 fast_exc_return_irq:                    /* restores irq state too */
 968         ld      r3,SOFTE(r1)
 969         ld      r12,_MSR(r1)
 970         stb     r3,PACASOFTIRQEN(r13)   /* restore paca->soft_enabled */
 971         rldicl  r4,r12,49,63            /* get MSR_EE to LSB */
 972         stb     r4,PACAHARDIRQEN(r13)   /* restore paca->hard_enabled */
 973         b       1f
 974
 975         .globl  fast_exception_return
 976 fast_exception_return:
 977         ld      r12,_MSR(r1)
 978 1:      ld      r11,_NIP(r1)
 979         andi.   r3,r12,MSR_RI           /* check if RI is set */
 980         beq-    unrecov_fer
 981
 982 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 983         andi.   r3,r12,MSR_PR
 984         beq     2f
 985         ACCOUNT_CPU_USER_EXIT(r3, r4)
 986 2:
 987 #endif
 988
 989         ld      r3,_CCR(r1)
 990         ld      r4,_LINK(r1)
 991         ld      r5,_CTR(r1)
 992         ld      r6,_XER(r1)
 993         mtcr    r3
 994         mtlr    r4
 995         mtctr   r5
 996         mtxer   r6
 997         REST_GPR(0, r1)
 998         REST_8GPRS(2, r1)
 999
1000         mfmsr   r10
1001         rldicl  r10,r10,48,1            /* clear EE */
1002         rldicr  r10,r10,16,61           /* clear RI (LE is 0 already) */
1003         mtmsrd  r10,1
1004
1005         mtspr   SPRN_SRR1,r12
1006         mtspr   SPRN_SRR0,r11
1007         REST_4GPRS(10, r1)
1008         ld      r1,GPR1(r1)
1009         rfid
1010         b       .       /* prevent speculative execution */
1011
1012 unrecov_fer:
1013         bl      .save_nvgprs
1014 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
1015         bl      .unrecoverable_exception
1016         b       1b
1017
1018 /*
1019  * Here r13 points to the paca, r9 contains the saved CR,
1020  * SRR0 and SRR1 are saved in r11 and r12,
1021  * r9 - r13 are saved in paca->exgen.
1022  */
1023         .align  7
1024         .globl data_access_common
1025 data_access_common:
1026         mfspr   r10,SPRN_DAR
1027         std     r10,PACA_EXGEN+EX_DAR(r13)
1028         mfspr   r10,SPRN_DSISR
1029         stw     r10,PACA_EXGEN+EX_DSISR(r13)
1030         EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
1031         ld      r3,PACA_EXGEN+EX_DAR(r13)
1032         lwz     r4,PACA_EXGEN+EX_DSISR(r13)
1033         li      r5,0x300
1034         b       .do_hash_page           /* Try to handle as hpte fault */
1035
1036         .align  7
1037         .globl instruction_access_common
1038 instruction_access_common:
1039         EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
1040         ld      r3,_NIP(r1)
1041         andis.  r4,r12,0x5820
1042         li      r5,0x400
1043         b       .do_hash_page           /* Try to handle as hpte fault */
1044
1045 /*
1046  * Here is the common SLB miss user that is used when going to virtual
1047  * mode for SLB misses, that is currently not used
1048  */
1049 #ifdef __DISABLED__
1050         .align  7
1051         .globl  slb_miss_user_common
1052 slb_miss_user_common:
1053         mflr    r10
1054         std     r3,PACA_EXGEN+EX_DAR(r13)
1055         stw     r9,PACA_EXGEN+EX_CCR(r13)
1056         std     r10,PACA_EXGEN+EX_LR(r13)
1057         std     r11,PACA_EXGEN+EX_SRR0(r13)
1058         bl      .slb_allocate_user
1059
1060         ld      r10,PACA_EXGEN+EX_LR(r13)
1061         ld      r3,PACA_EXGEN+EX_R3(r13)
1062         lwz     r9,PACA_EXGEN+EX_CCR(r13)
1063         ld      r11,PACA_EXGEN+EX_SRR0(r13)
1064         mtlr    r10
1065         beq-    slb_miss_fault
1066
1067         andi.   r10,r12,MSR_RI          /* check for unrecoverable exception */
1068         beq-    unrecov_user_slb
1069         mfmsr   r10
1070
1071 .machine push
1072 .machine "power4"
1073         mtcrf   0x80,r9
1074 .machine pop
1075
1076         clrrdi  r10,r10,2               /* clear RI before setting SRR0/1 */
1077         mtmsrd  r10,1
1078
1079         mtspr   SRR0,r11
1080         mtspr   SRR1,r12
1081
1082         ld      r9,PACA_EXGEN+EX_R9(r13)
1083         ld      r10,PACA_EXGEN+EX_R10(r13)
1084         ld      r11,PACA_EXGEN+EX_R11(r13)
1085         ld      r12,PACA_EXGEN+EX_R12(r13)
1086         ld      r13,PACA_EXGEN+EX_R13(r13)
1087         rfid
1088         b       .
1089
1090 slb_miss_fault:
1091         EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1092         ld      r4,PACA_EXGEN+EX_DAR(r13)
1093         li      r5,0
1094         std     r4,_DAR(r1)
1095         std     r5,_DSISR(r1)
1096         b       handle_page_fault
1097
1098 unrecov_user_slb:
1099         EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1100         DISABLE_INTS
1101         bl      .save_nvgprs
1102 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
1103         bl      .unrecoverable_exception
1104         b       1b
1105
1106 #endif /* __DISABLED__ */
1107
1108
1109 /*
1110  * r13 points to the PACA, r9 contains the saved CR,
1111  * r12 contain the saved SRR1, SRR0 is still ready for return
1112  * r3 has the faulting address
1113  * r9 - r13 are saved in paca->exslb.
1114  * r3 is saved in paca->slb_r3
1115  * We assume we aren't going to take any exceptions during this procedure.
1116  */
1117 _GLOBAL(slb_miss_realmode)
1118         mflr    r10
1119
1120         stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
1121         std     r10,PACA_EXSLB+EX_LR(r13)       /* save LR */
1122
1123         bl      .slb_allocate_realmode
1124
1125         /* All done -- return from exception. */
1126
1127         ld      r10,PACA_EXSLB+EX_LR(r13)
1128         ld      r3,PACA_EXSLB+EX_R3(r13)
1129         lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
1130 #ifdef CONFIG_PPC_ISERIES
1131 BEGIN_FW_FTR_SECTION
1132         ld      r11,PACALPPACAPTR(r13)
1133         ld      r11,LPPACASRR0(r11)             /* get SRR0 value */
1134 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
1135 #endif /* CONFIG_PPC_ISERIES */
1136
1137         mtlr    r10
1138
1139         andi.   r10,r12,MSR_RI  /* check for unrecoverable exception */
1140         beq-    unrecov_slb
1141
1142 .machine        push
1143 .machine        "power4"
1144         mtcrf   0x80,r9
1145         mtcrf   0x01,r9         /* slb_allocate uses cr0 and cr7 */
1146 .machine        pop
1147
1148 #ifdef CONFIG_PPC_ISERIES
1149 BEGIN_FW_FTR_SECTION
1150         mtspr   SPRN_SRR0,r11
1151         mtspr   SPRN_SRR1,r12
1152 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
1153 #endif /* CONFIG_PPC_ISERIES */
1154         ld      r9,PACA_EXSLB+EX_R9(r13)
1155         ld      r10,PACA_EXSLB+EX_R10(r13)
1156         ld      r11,PACA_EXSLB+EX_R11(r13)
1157         ld      r12,PACA_EXSLB+EX_R12(r13)
1158         ld      r13,PACA_EXSLB+EX_R13(r13)
1159         rfid
1160         b       .       /* prevent speculative execution */
1161
1162 unrecov_slb:
1163         EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1164         DISABLE_INTS
1165         bl      .save_nvgprs
1166 1:      addi    r3,r1,STACK_FRAME_OVERHEAD
1167         bl      .unrecoverable_exception
1168         b       1b
1169
1170         .align  7
1171         .globl hardware_interrupt_common
1172         .globl hardware_interrupt_entry
1173 hardware_interrupt_common:
1174         EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
1175         FINISH_NAP
1176 hardware_interrupt_entry:
1177         DISABLE_INTS
1178         bl      .ppc64_runlatch_on
1179         addi    r3,r1,STACK_FRAME_OVERHEAD
1180         bl      .do_IRQ
1181         b       .ret_from_except_lite
1182
1183 #ifdef CONFIG_PPC_970_NAP
1184 power4_fixup_nap:
1185         andc    r9,r9,r10
1186         std     r9,TI_LOCAL_FLAGS(r11)
1187         ld      r10,_LINK(r1)           /* make idle task do the */
1188         std     r10,_NIP(r1)            /* equivalent of a blr */
1189         blr
1190 #endif
1191
1192         .align  7
1193         .globl alignment_common
1194 alignment_common:
1195         mfspr   r10,SPRN_DAR
1196         std     r10,PACA_EXGEN+EX_DAR(r13)
1197         mfspr   r10,SPRN_DSISR
1198         stw     r10,PACA_EXGEN+EX_DSISR(r13)
1199         EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1200         ld      r3,PACA_EXGEN+EX_DAR(r13)
1201         lwz     r4,PACA_EXGEN+EX_DSISR(r13)
1202         std     r3,_DAR(r1)
1203         std     r4,_DSISR(r1)
1204         bl      .save_nvgprs
1205         addi    r3,r1,STACK_FRAME_OVERHEAD
1206         ENABLE_INTS
1207         bl      .alignment_exception
1208         b       .ret_from_except
1209
1210         .align  7
1211         .globl program_check_common
1212 program_check_common:
1213         EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1214         bl      .save_nvgprs
1215         addi    r3,r1,STACK_FRAME_OVERHEAD
1216         ENABLE_INTS
1217         bl      .program_check_exception
1218         b       .ret_from_except
1219
1220         .align  7
1221         .globl fp_unavailable_common
1222 fp_unavailable_common:
1223         EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1224         bne     1f                      /* if from user, just load it up */
1225         bl      .save_nvgprs
1226         addi    r3,r1,STACK_FRAME_OVERHEAD
1227         ENABLE_INTS
1228         bl      .kernel_fp_unavailable_exception
1229         BUG_OPCODE
1230 1:      b       .load_up_fpu
1231
1232         .align  7
1233         .globl altivec_unavailable_common
1234 altivec_unavailable_common:
1235         EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1236 #ifdef CONFIG_ALTIVEC
1237 BEGIN_FTR_SECTION
1238         bne     .load_up_altivec        /* if from user, just load it up */
1239 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1240 #endif
1241         bl      .save_nvgprs
1242         addi    r3,r1,STACK_FRAME_OVERHEAD
1243         ENABLE_INTS
1244         bl      .altivec_unavailable_exception
1245         b       .ret_from_except
1246
1247 #ifdef CONFIG_ALTIVEC
1248 /*
1249  * load_up_altivec(unused, unused, tsk)
1250  * Disable VMX for the task which had it previously,
1251  * and save its vector registers in its thread_struct.
1252  * Enables the VMX for use in the kernel on return.
1253  * On SMP we know the VMX is free, since we give it up every
1254  * switch (ie, no lazy save of the vector registers).
1255  * On entry: r13 == 'current' && last_task_used_altivec != 'current'
1256  */
1257 _STATIC(load_up_altivec)
1258         mfmsr   r5                      /* grab the current MSR */
1259         oris    r5,r5,MSR_VEC@h
1260         mtmsrd  r5                      /* enable use of VMX now */
1261         isync
1262
1263 /*
1264  * For SMP, we don't do lazy VMX switching because it just gets too
1265  * horrendously complex, especially when a task switches from one CPU
1266  * to another.  Instead we call giveup_altvec in switch_to.
1267  * VRSAVE isn't dealt with here, that is done in the normal context
1268  * switch code. Note that we could rely on vrsave value to eventually
1269  * avoid saving all of the VREGs here...
1270  */
1271 #ifndef CONFIG_SMP
1272         ld      r3,last_task_used_altivec@got(r2)
1273         ld      r4,0(r3)
1274         cmpdi   0,r4,0
1275         beq     1f
1276         /* Save VMX state to last_task_used_altivec's THREAD struct */
1277         addi    r4,r4,THREAD
1278         SAVE_32VRS(0,r5,r4)
1279         mfvscr  vr0
1280         li      r10,THREAD_VSCR
1281         stvx    vr0,r10,r4
1282         /* Disable VMX for last_task_used_altivec */
1283         ld      r5,PT_REGS(r4)
1284         ld      r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1285         lis     r6,MSR_VEC@h
1286         andc    r4,r4,r6
1287         std     r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1288 1:
1289 #endif /* CONFIG_SMP */
1290         /* Hack: if we get an altivec unavailable trap with VRSAVE
1291          * set to all zeros, we assume this is a broken application
1292          * that fails to set it properly, and thus we switch it to
1293          * all 1's
1294          */
1295         mfspr   r4,SPRN_VRSAVE
1296         cmpdi   0,r4,0
1297         bne+    1f
1298         li      r4,-1
1299         mtspr   SPRN_VRSAVE,r4
1300 1:
1301         /* enable use of VMX after return */
1302         ld      r4,PACACURRENT(r13)
1303         addi    r5,r4,THREAD            /* Get THREAD */
1304         oris    r12,r12,MSR_VEC@h
1305         std     r12,_MSR(r1)
1306         li      r4,1
1307         li      r10,THREAD_VSCR
1308         stw     r4,THREAD_USED_VR(r5)
1309         lvx     vr0,r10,r5
1310         mtvscr  vr0
1311         REST_32VRS(0,r4,r5)
1312 #ifndef CONFIG_SMP
1313         /* Update last_task_used_math to 'current' */
1314         subi    r4,r5,THREAD            /* Back to 'current' */
1315         std     r4,0(r3)
1316 #endif /* CONFIG_SMP */
1317         /* restore registers and return */
1318         b       fast_exception_return
1319 #endif /* CONFIG_ALTIVEC */
1320
1321 /*
1322  * Hash table stuff
1323  */
1324         .align  7
1325 _GLOBAL(do_hash_page)
1326         std     r3,_DAR(r1)
1327         std     r4,_DSISR(r1)
1328
1329         andis.  r0,r4,0xa450            /* weird error? */
1330         bne-    handle_page_fault       /* if not, try to insert a HPTE */
1331 BEGIN_FTR_SECTION
1332         andis.  r0,r4,0x0020            /* Is it a segment table fault? */
1333         bne-    do_ste_alloc            /* If so handle it */
1334 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1335
1336         /*
1337          * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1338          * accessing a userspace segment (even from the kernel). We assume
1339          * kernel addresses always have the high bit set.
1340          */
1341         rlwinm  r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1342         rotldi  r0,r3,15                /* Move high bit into MSR_PR posn */
1343         orc     r0,r12,r0               /* MSR_PR | ~high_bit */
1344         rlwimi  r4,r0,32-13,30,30       /* becomes _PAGE_USER access bit */
1345         ori     r4,r4,1                 /* add _PAGE_PRESENT */
1346         rlwimi  r4,r5,22+2,31-2,31-2    /* Set _PAGE_EXEC if trap is 0x400 */
1347
1348         /*
1349          * On iSeries, we soft-disable interrupts here, then
1350          * hard-enable interrupts so that the hash_page code can spin on
1351          * the hash_table_lock without problems on a shared processor.
1352          */
1353         DISABLE_INTS
1354
1355         /*
1356          * r3 contains the faulting address
1357          * r4 contains the required access permissions
1358          * r5 contains the trap number
1359          *
1360          * at return r3 = 0 for success
1361          */
1362         bl      .hash_page              /* build HPTE if possible */
1363         cmpdi   r3,0                    /* see if hash_page succeeded */
1364
1365 #ifdef DO_SOFT_DISABLE
1366 BEGIN_FW_FTR_SECTION
1367         /*
1368          * If we had interrupts soft-enabled at the point where the
1369          * DSI/ISI occurred, and an interrupt came in during hash_page,
1370          * handle it now.
1371          * We jump to ret_from_except_lite rather than fast_exception_return
1372          * because ret_from_except_lite will check for and handle pending
1373          * interrupts if necessary.
1374          */
1375         beq     13f
1376 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
1377 #endif
1378 BEGIN_FW_FTR_SECTION
1379         /*
1380          * Here we have interrupts hard-disabled, so it is sufficient
1381          * to restore paca->{soft,hard}_enable and get out.
1382          */
1383         beq     fast_exc_return_irq     /* Return from exception on success */
1384 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
1385
1386         /* For a hash failure, we don't bother re-enabling interrupts */
1387         ble-    12f
1388
1389         /*
1390          * hash_page couldn't handle it, set soft interrupt enable back
1391          * to what it was before the trap.  Note that .local_irq_restore
1392          * handles any interrupts pending at this point.
1393          */
1394         ld      r3,SOFTE(r1)
1395         bl      .local_irq_restore
1396         b       11f
1397
1398 /* Here we have a page fault that hash_page can't handle. */
1399 handle_page_fault:
1400         ENABLE_INTS
1401 11:     ld      r4,_DAR(r1)
1402         ld      r5,_DSISR(r1)
1403         addi    r3,r1,STACK_FRAME_OVERHEAD
1404         bl      .do_page_fault
1405         cmpdi   r3,0
1406         beq+    13f
1407         bl      .save_nvgprs
1408         mr      r5,r3
1409         addi    r3,r1,STACK_FRAME_OVERHEAD
1410         lwz     r4,_DAR(r1)
1411         bl      .bad_page_fault
1412         b       .ret_from_except
1413
1414 13:     b       .ret_from_except_lite
1415
1416 /* We have a page fault that hash_page could handle but HV refused
1417  * the PTE insertion
1418  */
1419 12:     bl      .save_nvgprs
1420         addi    r3,r1,STACK_FRAME_OVERHEAD
1421         lwz     r4,_DAR(r1)
1422         bl      .low_hash_fault
1423         b       .ret_from_except
1424
1425         /* here we have a segment miss */
1426 do_ste_alloc:
1427         bl      .ste_allocate           /* try to insert stab entry */
1428         cmpdi   r3,0
1429         bne-    handle_page_fault
1430         b       fast_exception_return
1431
1432 /*
1433  * r13 points to the PACA, r9 contains the saved CR,
1434  * r11 and r12 contain the saved SRR0 and SRR1.
1435  * r9 - r13 are saved in paca->exslb.
1436  * We assume we aren't going to take any exceptions during this procedure.
1437  * We assume (DAR >> 60) == 0xc.
1438  */
1439         .align  7
1440 _GLOBAL(do_stab_bolted)
1441         stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
1442         std     r11,PACA_EXSLB+EX_SRR0(r13)     /* save SRR0 in exc. frame */
1443
1444         /* Hash to the primary group */
1445         ld      r10,PACASTABVIRT(r13)
1446         mfspr   r11,SPRN_DAR
1447         srdi    r11,r11,28
1448         rldimi  r10,r11,7,52    /* r10 = first ste of the group */
1449
1450         /* Calculate VSID */
1451         /* This is a kernel address, so protovsid = ESID */
1452         ASM_VSID_SCRAMBLE(r11, r9)
1453         rldic   r9,r11,12,16    /* r9 = vsid << 12 */
1454
1455         /* Search the primary group for a free entry */
1456 1:      ld      r11,0(r10)      /* Test valid bit of the current ste    */
1457         andi.   r11,r11,0x80
1458         beq     2f
1459         addi    r10,r10,16
1460         andi.   r11,r10,0x70
1461         bne     1b
1462
1463         /* Stick for only searching the primary group for now.          */
1464         /* At least for now, we use a very simple random castout scheme */
1465         /* Use the TB as a random number ;  OR in 1 to avoid entry 0    */
1466         mftb    r11
1467         rldic   r11,r11,4,57    /* r11 = (r11 << 4) & 0x70 */
1468         ori     r11,r11,0x10
1469
1470         /* r10 currently points to an ste one past the group of interest */
1471         /* make it point to the randomly selected entry                 */
1472         subi    r10,r10,128
1473         or      r10,r10,r11     /* r10 is the entry to invalidate       */
1474
1475         isync                   /* mark the entry invalid               */
1476         ld      r11,0(r10)
1477         rldicl  r11,r11,56,1    /* clear the valid bit */
1478         rotldi  r11,r11,8
1479         std     r11,0(r10)
1480         sync
1481
1482         clrrdi  r11,r11,28      /* Get the esid part of the ste         */
1483         slbie   r11
1484
1485 2:      std     r9,8(r10)       /* Store the vsid part of the ste       */
1486         eieio
1487
1488         mfspr   r11,SPRN_DAR            /* Get the new esid                     */
1489         clrrdi  r11,r11,28      /* Permits a full 32b of ESID           */
1490         ori     r11,r11,0x90    /* Turn on valid and kp                 */
1491         std     r11,0(r10)      /* Put new entry back into the stab     */
1492
1493         sync
1494
1495         /* All done -- return from exception. */
1496         lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
1497         ld      r11,PACA_EXSLB+EX_SRR0(r13)     /* get saved SRR0 */
1498
1499         andi.   r10,r12,MSR_RI
1500         beq-    unrecov_slb
1501
1502         mtcrf   0x80,r9                 /* restore CR */
1503
1504         mfmsr   r10
1505         clrrdi  r10,r10,2
1506         mtmsrd  r10,1
1507
1508         mtspr   SPRN_SRR0,r11
1509         mtspr   SPRN_SRR1,r12
1510         ld      r9,PACA_EXSLB+EX_R9(r13)
1511         ld      r10,PACA_EXSLB+EX_R10(r13)
1512         ld      r11,PACA_EXSLB+EX_R11(r13)
1513         ld      r12,PACA_EXSLB+EX_R12(r13)
1514         ld      r13,PACA_EXSLB+EX_R13(r13)
1515         rfid
1516         b       .       /* prevent speculative execution */
1517
1518 /*
1519  * Space for CPU0's segment table.
1520  *
1521  * On iSeries, the hypervisor must fill in at least one entry before
1522  * we get control (with relocate on).  The address is give to the hv
1523  * as a page number (see xLparMap in lpardata.c), so this must be at a
1524  * fixed address (the linker can't compute (u64)&initial_stab >>
1525  * PAGE_SHIFT).
1526  */
1527         . = STAB0_OFFSET        /* 0x6000 */
1528         .globl initial_stab
1529 initial_stab:
1530         .space  4096
1531
1532 /*
1533  * Data area reserved for FWNMI option.
1534  * This address (0x7000) is fixed by the RPA.
1535  */
1536         .= 0x7000
1537         .globl fwnmi_data_area
1538 fwnmi_data_area:
1539
1540         /* iSeries does not use the FWNMI stuff, so it is safe to put
1541          * this here, even if we later allow kernels that will boot on
1542          * both pSeries and iSeries */
1543 #ifdef CONFIG_PPC_ISERIES
1544         . = LPARMAP_PHYS
1545 #include "lparmap.s"
1546 /*
1547  * This ".text" is here for old compilers that generate a trailing
1548  * .note section when compiling .c files to .s
1549  */
1550         .text
1551 #endif /* CONFIG_PPC_ISERIES */
1552
1553         . = 0x8000
1554
1555 /*
1556  * On pSeries and most other platforms, secondary processors spin
1557  * in the following code.
1558  * At entry, r3 = this processor's number (physical cpu id)
1559  */
1560 _GLOBAL(generic_secondary_smp_init)
1561         mr      r24,r3
1562
1563         /* turn on 64-bit mode */
1564         bl      .enable_64b_mode
1565
1566         /* Set up a paca value for this processor. Since we have the
1567          * physical cpu id in r24, we need to search the pacas to find
1568          * which logical id maps to our physical one.
1569          */
1570         LOAD_REG_IMMEDIATE(r13, paca)   /* Get base vaddr of paca array  */
1571         li      r5,0                    /* logical cpu id                */
1572 1:      lhz     r6,PACAHWCPUID(r13)     /* Load HW procid from paca      */
1573         cmpw    r6,r24                  /* Compare to our id             */
1574         beq     2f
1575         addi    r13,r13,PACA_SIZE       /* Loop to next PACA on miss     */
1576         addi    r5,r5,1
1577         cmpwi   r5,NR_CPUS
1578         blt     1b
1579
1580         mr      r3,r24                  /* not found, copy phys to r3    */
1581         b       .kexec_wait             /* next kernel might do better   */
1582
1583 2:      mtspr   SPRN_SPRG3,r13          /* Save vaddr of paca in SPRG3   */
1584         /* From now on, r24 is expected to be logical cpuid */
1585         mr      r24,r5
1586 3:      HMT_LOW
1587         lbz     r23,PACAPROCSTART(r13)  /* Test if this processor should */
1588                                         /* start.                        */
1589         sync
1590
1591 #ifndef CONFIG_SMP
1592         b       3b                      /* Never go on non-SMP           */
1593 #else
1594         cmpwi   0,r23,0
1595         beq     3b                      /* Loop until told to go         */
1596
1597         /* See if we need to call a cpu state restore handler */
1598         LOAD_REG_IMMEDIATE(r23, cur_cpu_spec)
1599         ld      r23,0(r23)
1600         ld      r23,CPU_SPEC_RESTORE(r23)
1601         cmpdi   0,r23,0
1602         beq     4f
1603         ld      r23,0(r23)
1604         mtctr   r23
1605         bctrl
1606
1607 4:      /* Create a temp kernel stack for use before relocation is on.  */
1608         ld      r1,PACAEMERGSP(r13)
1609         subi    r1,r1,STACK_FRAME_OVERHEAD
1610
1611         b       __secondary_start
1612 #endif
1613
1614 #ifdef CONFIG_PPC_ISERIES
1615 _INIT_STATIC(__start_initialization_iSeries)
1616         /* Clear out the BSS */
1617         LOAD_REG_IMMEDIATE(r11,__bss_stop)
1618         LOAD_REG_IMMEDIATE(r8,__bss_start)
1619         sub     r11,r11,r8              /* bss size                     */
1620         addi    r11,r11,7               /* round up to an even double word */
1621         rldicl. r11,r11,61,3            /* shift right by 3             */
1622         beq     4f
1623         addi    r8,r8,-8
1624         li      r0,0
1625         mtctr   r11                     /* zero this many doublewords   */
1626 3:      stdu    r0,8(r8)
1627         bdnz    3b
1628 4:
1629         LOAD_REG_IMMEDIATE(r1,init_thread_union)
1630         addi    r1,r1,THREAD_SIZE
1631         li      r0,0
1632         stdu    r0,-STACK_FRAME_OVERHEAD(r1)
1633
1634         LOAD_REG_IMMEDIATE(r2,__toc_start)
1635         addi    r2,r2,0x4000
1636         addi    r2,r2,0x4000
1637
1638         bl      .iSeries_early_setup
1639         bl      .early_setup
1640
1641         /* relocation is on at this point */
1642
1643         b       .start_here_common
1644 #endif /* CONFIG_PPC_ISERIES */
1645
1646
1647 _STATIC(__mmu_off)
1648         mfmsr   r3
1649         andi.   r0,r3,MSR_IR|MSR_DR
1650         beqlr
1651         andc    r3,r3,r0
1652         mtspr   SPRN_SRR0,r4
1653         mtspr   SPRN_SRR1,r3
1654         sync
1655         rfid
1656         b       .       /* prevent speculative execution */
1657
1658
1659 /*
1660  * Here is our main kernel entry point. We support currently 2 kind of entries
1661  * depending on the value of r5.
1662  *
1663  *   r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
1664  *                 in r3...r7
1665  *
1666  *   r5 == NULL -> kexec style entry. r3 is a physical pointer to the
1667  *                 DT block, r4 is a physical pointer to the kernel itself
1668  *
1669  */
1670 _GLOBAL(__start_initialization_multiplatform)
1671         /*
1672          * Are we booted from a PROM Of-type client-interface ?
1673          */
1674         cmpldi  cr0,r5,0
1675         beq     1f
1676         b       .__boot_from_prom               /* yes -> prom */
1677 1:
1678         /* Save parameters */
1679         mr      r31,r3
1680         mr      r30,r4
1681
1682         /* Make sure we are running in 64 bits mode */
1683         bl      .enable_64b_mode
1684
1685         /* Setup some critical 970 SPRs before switching MMU off */
1686         mfspr   r0,SPRN_PVR
1687         srwi    r0,r0,16
1688         cmpwi   r0,0x39         /* 970 */
1689         beq     1f
1690         cmpwi   r0,0x3c         /* 970FX */
1691         beq     1f
1692         cmpwi   r0,0x44         /* 970MP */
1693         beq     1f
1694         cmpwi   r0,0x45         /* 970GX */
1695         bne     2f
1696 1:      bl      .__cpu_preinit_ppc970
1697 2:
1698
1699         /* Switch off MMU if not already */
1700         LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
1701         add     r4,r4,r30
1702         bl      .__mmu_off
1703         b       .__after_prom_start
1704
1705 _INIT_STATIC(__boot_from_prom)
1706         /* Save parameters */
1707         mr      r31,r3
1708         mr      r30,r4
1709         mr      r29,r5
1710         mr      r28,r6
1711         mr      r27,r7
1712
1713         /*
1714          * Align the stack to 16-byte boundary
1715          * Depending on the size and layout of the ELF sections in the initial
1716          * boot binary, the stack pointer will be unalignet on PowerMac
1717          */
1718         rldicr  r1,r1,0,59
1719
1720         /* Make sure we are running in 64 bits mode */
1721         bl      .enable_64b_mode
1722
1723         /* put a relocation offset into r3 */
1724         bl      .reloc_offset
1725
1726         LOAD_REG_IMMEDIATE(r2,__toc_start)
1727         addi    r2,r2,0x4000
1728         addi    r2,r2,0x4000
1729
1730         /* Relocate the TOC from a virt addr to a real addr */
1731         add     r2,r2,r3
1732
1733         /* Restore parameters */
1734         mr      r3,r31
1735         mr      r4,r30
1736         mr      r5,r29
1737         mr      r6,r28
1738         mr      r7,r27
1739
1740         /* Do all of the interaction with OF client interface */
1741         bl      .prom_init
1742         /* We never return */
1743         trap
1744
1745 _STATIC(__after_prom_start)
1746
1747 /*
1748  * We need to run with __start at physical address PHYSICAL_START.
1749  * This will leave some code in the first 256B of
1750  * real memory, which are reserved for software use.
1751  * The remainder of the first page is loaded with the fixed
1752  * interrupt vectors.  The next two pages are filled with
1753  * unknown exception placeholders.
1754  *
1755  * Note: This process overwrites the OF exception vectors.
1756  *      r26 == relocation offset
1757  *      r27 == KERNELBASE
1758  */
1759         bl      .reloc_offset
1760         mr      r26,r3
1761         LOAD_REG_IMMEDIATE(r27, KERNELBASE)
1762
1763         LOAD_REG_IMMEDIATE(r3, PHYSICAL_START)  /* target addr */
1764
1765         // XXX FIXME: Use phys returned by OF (r30)
1766         add     r4,r27,r26              /* source addr                   */
1767                                         /* current address of _start     */
1768                                         /*   i.e. where we are running   */
1769                                         /*      the source addr          */
1770
1771         cmpdi   r4,0                    /* In some cases the loader may  */
1772         bne     1f
1773         b       .start_here_multiplatform /* have already put us at zero */
1774                                         /* so we can skip the copy.      */
1775 1:      LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
1776         sub     r5,r5,r27
1777
1778         li      r6,0x100                /* Start offset, the first 0x100 */
1779                                         /* bytes were copied earlier.    */
1780
1781         bl      .copy_and_flush         /* copy the first n bytes        */
1782                                         /* this includes the code being  */
1783                                         /* executed here.                */
1784
1785         LOAD_REG_IMMEDIATE(r0, 4f)      /* Jump to the copy of this code */
1786         mtctr   r0                      /* that we just made/relocated   */
1787         bctr
1788
1789 4:      LOAD_REG_IMMEDIATE(r5,klimit)
1790         add     r5,r5,r26
1791         ld      r5,0(r5)                /* get the value of klimit */
1792         sub     r5,r5,r27
1793         bl      .copy_and_flush         /* copy the rest */
1794         b       .start_here_multiplatform
1795
1796 /*
1797  * Copy routine used to copy the kernel to start at physical address 0
1798  * and flush and invalidate the caches as needed.
1799  * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
1800  * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
1801  *
1802  * Note: this routine *only* clobbers r0, r6 and lr
1803  */
1804 _GLOBAL(copy_and_flush)
1805         addi    r5,r5,-8
1806         addi    r6,r6,-8
1807 4:      li      r0,8                    /* Use the smallest common      */
1808                                         /* denominator cache line       */
1809                                         /* size.  This results in       */
1810                                         /* extra cache line flushes     */
1811                                         /* but operation is correct.    */
1812                                         /* Can't get cache line size    */
1813                                         /* from NACA as it is being     */
1814                                         /* moved too.                   */
1815
1816         mtctr   r0                      /* put # words/line in ctr      */
1817 3:      addi    r6,r6,8                 /* copy a cache line            */
1818         ldx     r0,r6,r4
1819         stdx    r0,r6,r3
1820         bdnz    3b
1821         dcbst   r6,r3                   /* write it to memory           */
1822         sync
1823         icbi    r6,r3                   /* flush the icache line        */
1824         cmpld   0,r6,r5
1825         blt     4b
1826         sync
1827         addi    r5,r5,8
1828         addi    r6,r6,8
1829         blr
1830
1831 .align 8
1832 copy_to_here:
1833
1834 #ifdef CONFIG_SMP
1835 #ifdef CONFIG_PPC_PMAC
1836 /*
1837  * On PowerMac, secondary processors starts from the reset vector, which
1838  * is temporarily turned into a call to one of the functions below.
1839  */
1840         .section ".text";
1841         .align 2 ;
1842
1843         .globl  __secondary_start_pmac_0
1844 __secondary_start_pmac_0:
1845         /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
1846         li      r24,0
1847         b       1f
1848         li      r24,1
1849         b       1f
1850         li      r24,2
1851         b       1f
1852         li      r24,3
1853 1:
1854
1855 _GLOBAL(pmac_secondary_start)
1856         /* turn on 64-bit mode */
1857         bl      .enable_64b_mode
1858
1859         /* Copy some CPU settings from CPU 0 */
1860         bl      .__restore_cpu_ppc970
1861
1862         /* pSeries do that early though I don't think we really need it */
1863         mfmsr   r3
1864         ori     r3,r3,MSR_RI
1865         mtmsrd  r3                      /* RI on */
1866
1867         /* Set up a paca value for this processor. */
1868         LOAD_REG_IMMEDIATE(r4, paca)    /* Get base vaddr of paca array */
1869         mulli   r13,r24,PACA_SIZE        /* Calculate vaddr of right paca */
1870         add     r13,r13,r4              /* for this processor.          */
1871         mtspr   SPRN_SPRG3,r13           /* Save vaddr of paca in SPRG3 */
1872
1873         /* Create a temp kernel stack for use before relocation is on.  */
1874         ld      r1,PACAEMERGSP(r13)
1875         subi    r1,r1,STACK_FRAME_OVERHEAD
1876
1877         b       __secondary_start
1878
1879 #endif /* CONFIG_PPC_PMAC */
1880
1881 /*
1882  * This function is called after the master CPU has released the
1883  * secondary processors.  The execution environment is relocation off.
1884  * The paca for this processor has the following fields initialized at
1885  * this point:
1886  *   1. Processor number
1887  *   2. Segment table pointer (virtual address)
1888  * On entry the following are set:
1889  *   r1 = stack pointer.  vaddr for iSeries, raddr (temp stack) for pSeries
1890  *   r24   = cpu# (in Linux terms)
1891  *   r13   = paca virtual address
1892  *   SPRG3 = paca virtual address
1893  */
1894 __secondary_start:
1895         /* Set thread priority to MEDIUM */
1896         HMT_MEDIUM
1897
1898         /* Load TOC */
1899         ld      r2,PACATOC(r13)
1900
1901         /* Do early setup for that CPU (stab, slb, hash table pointer) */
1902         bl      .early_setup_secondary
1903
1904         /* Initialize the kernel stack.  Just a repeat for iSeries.      */
1905         LOAD_REG_ADDR(r3, current_set)
1906         sldi    r28,r24,3               /* get current_set[cpu#]         */
1907         ldx     r1,r3,r28
1908         addi    r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1909         std     r1,PACAKSAVE(r13)
1910
1911         /* Clear backchain so we get nice backtraces */
1912         li      r7,0
1913         mtlr    r7
1914
1915         /* enable MMU and jump to start_secondary */
1916         LOAD_REG_ADDR(r3, .start_secondary_prolog)
1917         LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1918 #ifdef CONFIG_PPC_ISERIES
1919 BEGIN_FW_FTR_SECTION
1920         ori     r4,r4,MSR_EE
1921 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
1922 #endif
1923 BEGIN_FW_FTR_SECTION
1924         stb     r7,PACASOFTIRQEN(r13)
1925         stb     r7,PACAHARDIRQEN(r13)
1926 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
1927
1928         mtspr   SPRN_SRR0,r3
1929         mtspr   SPRN_SRR1,r4
1930         rfid
1931         b       .       /* prevent speculative execution */
1932
1933 /*
1934  * Running with relocation on at this point.  All we want to do is
1935  * zero the stack back-chain pointer before going into C code.
1936  */
1937 _GLOBAL(start_secondary_prolog)
1938         li      r3,0
1939         std     r3,0(r1)                /* Zero the stack frame pointer */
1940         bl      .start_secondary
1941         b       .
1942 #endif
1943
1944 /*
1945  * This subroutine clobbers r11 and r12
1946  */
1947 _GLOBAL(enable_64b_mode)
1948         mfmsr   r11                     /* grab the current MSR */
1949         li      r12,1
1950         rldicr  r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1951         or      r11,r11,r12
1952         li      r12,1
1953         rldicr  r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1954         or      r11,r11,r12
1955         mtmsrd  r11
1956         isync
1957         blr
1958
1959 /*
1960  * This is where the main kernel code starts.
1961  */
1962 _INIT_STATIC(start_here_multiplatform)
1963         /* get a new offset, now that the kernel has moved. */
1964         bl      .reloc_offset
1965         mr      r26,r3
1966
1967         /* Clear out the BSS. It may have been done in prom_init,
1968          * already but that's irrelevant since prom_init will soon
1969          * be detached from the kernel completely. Besides, we need
1970          * to clear it now for kexec-style entry.
1971          */
1972         LOAD_REG_IMMEDIATE(r11,__bss_stop)
1973         LOAD_REG_IMMEDIATE(r8,__bss_start)
1974         sub     r11,r11,r8              /* bss size                     */
1975         addi    r11,r11,7               /* round up to an even double word */
1976         rldicl. r11,r11,61,3            /* shift right by 3             */
1977         beq     4f
1978         addi    r8,r8,-8
1979         li      r0,0
1980         mtctr   r11                     /* zero this many doublewords   */
1981 3:      stdu    r0,8(r8)
1982         bdnz    3b
1983 4:
1984
1985         mfmsr   r6
1986         ori     r6,r6,MSR_RI
1987         mtmsrd  r6                      /* RI on */
1988
1989         /* The following gets the stack and TOC set up with the regs */
1990         /* pointing to the real addr of the kernel stack.  This is   */
1991         /* all done to support the C function call below which sets  */
1992         /* up the htab.  This is done because we have relocated the  */
1993         /* kernel but are still running in real mode. */
1994
1995         LOAD_REG_IMMEDIATE(r3,init_thread_union)
1996         add     r3,r3,r26
1997
1998         /* set up a stack pointer (physical address) */
1999         addi    r1,r3,THREAD_SIZE
2000         li      r0,0
2001         stdu    r0,-STACK_FRAME_OVERHEAD(r1)
2002
2003         /* set up the TOC (physical address) */
2004         LOAD_REG_IMMEDIATE(r2,__toc_start)
2005         addi    r2,r2,0x4000
2006         addi    r2,r2,0x4000
2007         add     r2,r2,r26
2008
2009         /* Do very early kernel initializations, including initial hash table,
2010          * stab and slb setup before we turn on relocation.     */
2011
2012         /* Restore parameters passed from prom_init/kexec */
2013         mr      r3,r31
2014         bl      .early_setup
2015
2016         LOAD_REG_IMMEDIATE(r3, .start_here_common)
2017         LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
2018         mtspr   SPRN_SRR0,r3
2019         mtspr   SPRN_SRR1,r4
2020         rfid
2021         b       .       /* prevent speculative execution */
2022
2023         /* This is where all platforms converge execution */
2024 _INIT_STATIC(start_here_common)
2025         /* relocation is on at this point */
2026
2027         /* The following code sets up the SP and TOC now that we are */
2028         /* running with translation enabled. */
2029
2030         LOAD_REG_IMMEDIATE(r3,init_thread_union)
2031
2032         /* set up the stack */
2033         addi    r1,r3,THREAD_SIZE
2034         li      r0,0
2035         stdu    r0,-STACK_FRAME_OVERHEAD(r1)
2036
2037         /* ptr to current */
2038         LOAD_REG_IMMEDIATE(r4, init_task)
2039         std     r4,PACACURRENT(r13)
2040
2041         /* Load the TOC */
2042         ld      r2,PACATOC(r13)
2043         std     r1,PACAKSAVE(r13)
2044
2045         bl      .setup_system
2046
2047         /* Load up the kernel context */
2048 5:
2049         li      r5,0
2050         stb     r5,PACASOFTIRQEN(r13)   /* Soft Disabled */
2051 #ifdef CONFIG_PPC_ISERIES
2052 BEGIN_FW_FTR_SECTION
2053         mfmsr   r5
2054         ori     r5,r5,MSR_EE            /* Hard Enabled */
2055         mtmsrd  r5
2056 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
2057 #endif
2058 BEGIN_FW_FTR_SECTION
2059         stb     r5,PACAHARDIRQEN(r13)
2060 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
2061
2062         bl .start_kernel
2063
2064         /* Not reached */
2065         BUG_OPCODE
2066
2067 /*
2068  * We put a few things here that have to be page-aligned.
2069  * This stuff goes at the beginning of the bss, which is page-aligned.
2070  */
2071         .section ".bss"
2072
2073         .align  PAGE_SHIFT
2074
2075         .globl  empty_zero_page
2076 empty_zero_page:
2077         .space  PAGE_SIZE
2078
2079         .globl  swapper_pg_dir
2080 swapper_pg_dir:
2081         .space  PAGE_SIZE
2082
2083 /*
2084  * This space gets a copy of optional info passed to us by the bootstrap
2085  * Used to pass parameters into the kernel like root=/dev/sda1, etc.
2086  */
2087         .globl  cmd_line
2088 cmd_line:
2089         .space  COMMAND_LINE_SIZE