arch/sparc/kernel/head_64.S

   1 /* head.S: Initial boot code for the Sparc64 port of Linux.
   2  *
   3  * Copyright (C) 1996, 1997, 2007 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
   5  * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  */
   8
   9 #include <linux/version.h>
  10 #include <linux/errno.h>
  11 #include <linux/threads.h>
  12 #include <linux/init.h>
  13 #include <linux/linkage.h>
  14 #include <asm/thread_info.h>
  15 #include <asm/asi.h>
  16 #include <asm/pstate.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/spitfire.h>
  19 #include <asm/page.h>
  20 #include <asm/pgtable.h>
  21 #include <asm/errno.h>
  22 #include <asm/signal.h>
  23 #include <asm/processor.h>
  24 #include <asm/lsu.h>
  25 #include <asm/dcr.h>
  26 #include <asm/dcu.h>
  27 #include <asm/head.h>
  28 #include <asm/ttable.h>
  29 #include <asm/mmu.h>
  30 #include <asm/cpudata.h>
  31 #include <asm/pil.h>
  32 #include <asm/estate.h>
  33 #include <asm/sfafsr.h>
  34 #include <asm/unistd.h>
  35
  36 /* This section from from _start to sparc64_boot_end should fit into
  37  * 0x0000000000404000 to 0x0000000000408000.
  38  */
  39         .text
  40         .globl  start, _start, stext, _stext
  41 _start:
  42 start:
  43 _stext:
  44 stext:
  45 ! 0x0000000000404000
  46         b       sparc64_boot
  47          flushw                                 /* Flush register file.      */
  48
  49 /* This stuff has to be in sync with SILO and other potential boot loaders
  50  * Fields should be kept upward compatible and whenever any change is made,
  51  * HdrS version should be incremented.
  52  */
  53         .global root_flags, ram_flags, root_dev
  54         .global sparc_ramdisk_image, sparc_ramdisk_size
  55         .global sparc_ramdisk_image64
  56
  57         .ascii  "HdrS"
  58         .word   LINUX_VERSION_CODE
  59
  60         /* History:
  61          *
  62          * 0x0300 : Supports being located at other than 0x4000
  63          * 0x0202 : Supports kernel params string
  64          * 0x0201 : Supports reboot_command
  65          */
  66         .half   0x0301          /* HdrS version */
  67
  68 root_flags:
  69         .half   1
  70 root_dev:
  71         .half   0
  72 ram_flags:
  73         .half   0
  74 sparc_ramdisk_image:
  75         .word   0
  76 sparc_ramdisk_size:
  77         .word   0
  78         .xword  reboot_command
  79         .xword  bootstr_info
  80 sparc_ramdisk_image64:
  81         .xword  0
  82         .word   _end
  83
  84         /* PROM cif handler code address is in %o4.  */
  85 sparc64_boot:
  86         mov     %o4, %l7
  87
  88         /* We need to remap the kernel.  Use position independent
  89          * code to remap us to KERNBASE.
  90          *
  91          * SILO can invoke us with 32-bit address masking enabled,
  92          * so make sure that's clear.
  93          */
  94         rdpr    %pstate, %g1
  95         andn    %g1, PSTATE_AM, %g1
  96         wrpr    %g1, 0x0, %pstate
  97         ba,a,pt %xcc, 1f
  98
  99         .globl  prom_finddev_name, prom_chosen_path, prom_root_node
 100         .globl  prom_getprop_name, prom_mmu_name, prom_peer_name
 101         .globl  prom_callmethod_name, prom_translate_name, prom_root_compatible
 102         .globl  prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
 103         .globl  prom_boot_mapped_pc, prom_boot_mapping_mode
 104         .globl  prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
 105         .globl  prom_compatible_name, prom_cpu_path, prom_cpu_compatible
 106         .globl  is_sun4v, sun4v_chip_type, prom_set_trap_table_name
 107 prom_peer_name:
 108         .asciz  "peer"
 109 prom_compatible_name:
 110         .asciz  "compatible"
 111 prom_finddev_name:
 112         .asciz  "finddevice"
 113 prom_chosen_path:
 114         .asciz  "/chosen"
 115 prom_cpu_path:
 116         .asciz  "/cpu"
 117 prom_getprop_name:
 118         .asciz  "getprop"
 119 prom_mmu_name:
 120         .asciz  "mmu"
 121 prom_callmethod_name:
 122         .asciz  "call-method"
 123 prom_translate_name:
 124         .asciz  "translate"
 125 prom_map_name:
 126         .asciz  "map"
 127 prom_unmap_name:
 128         .asciz  "unmap"
 129 prom_set_trap_table_name:
 130         .asciz  "SUNW,set-trap-table"
 131 prom_sun4v_name:
 132         .asciz  "sun4v"
 133 prom_niagara_prefix:
 134         .asciz  "SUNW,UltraSPARC-T"
 135 prom_sparc_prefix:
 136         .asciz  "SPARC-"
 137 prom_sparc64x_prefix:
 138         .asciz  "SPARC64-X"
 139         .align  4
 140 prom_root_compatible:
 141         .skip   64
 142 prom_cpu_compatible:
 143         .skip   64
 144 prom_root_node:
 145         .word   0
 146 prom_mmu_ihandle_cache:
 147         .word   0
 148 prom_boot_mapped_pc:
 149         .word   0
 150 prom_boot_mapping_mode:
 151         .word   0
 152         .align  8
 153 prom_boot_mapping_phys_high:
 154         .xword  0
 155 prom_boot_mapping_phys_low:
 156         .xword  0
 157 is_sun4v:
 158         .word   0
 159 sun4v_chip_type:
 160         .word   SUN4V_CHIP_INVALID
 161 1:
 162         rd      %pc, %l0
 163
 164         mov     (1b - prom_peer_name), %l1
 165         sub     %l0, %l1, %l1
 166         mov     0, %l2
 167
 168         /* prom_root_node = prom_peer(0) */
 169         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "peer"
 170         mov     1, %l3
 171         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 172         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 173         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, 0
 174         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 175         call    %l7
 176          add    %sp, (2047 + 128), %o0          ! argument array
 177
 178         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! prom root node
 179         mov     (1b - prom_root_node), %l1
 180         sub     %l0, %l1, %l1
 181         stw     %l4, [%l1]
 182
 183         mov     (1b - prom_getprop_name), %l1
 184         mov     (1b - prom_compatible_name), %l2
 185         mov     (1b - prom_root_compatible), %l5
 186         sub     %l0, %l1, %l1
 187         sub     %l0, %l2, %l2
 188         sub     %l0, %l5, %l5
 189
 190         /* prom_getproperty(prom_root_node, "compatible",
 191          *                  &prom_root_compatible, 64)
 192          */
 193         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 194         mov     4, %l3
 195         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 196         mov     1, %l3
 197         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 198         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, prom_root_node
 199         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "compatible"
 200         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_root_compatible
 201         mov     64, %l3
 202         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, size
 203         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 204         call    %l7
 205          add    %sp, (2047 + 128), %o0          ! argument array
 206
 207         mov     (1b - prom_finddev_name), %l1
 208         mov     (1b - prom_chosen_path), %l2
 209         mov     (1b - prom_boot_mapped_pc), %l3
 210         sub     %l0, %l1, %l1
 211         sub     %l0, %l2, %l2
 212         sub     %l0, %l3, %l3
 213         stw     %l0, [%l3]
 214         sub     %sp, (192 + 128), %sp
 215
 216         /* chosen_node = prom_finddevice("/chosen") */
 217         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "finddevice"
 218         mov     1, %l3
 219         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 220         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 221         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, "/chosen"
 222         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 223         call    %l7
 224          add    %sp, (2047 + 128), %o0          ! argument array
 225
 226         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! chosen device node
 227
 228         mov     (1b - prom_getprop_name), %l1
 229         mov     (1b - prom_mmu_name), %l2
 230         mov     (1b - prom_mmu_ihandle_cache), %l5
 231         sub     %l0, %l1, %l1
 232         sub     %l0, %l2, %l2
 233         sub     %l0, %l5, %l5
 234
 235         /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
 236         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 237         mov     4, %l3
 238         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 239         mov     1, %l3
 240         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 241         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, chosen_node
 242         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "mmu"
 243         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_mmu_ihandle_cache
 244         mov     4, %l3
 245         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, sizeof(arg3)
 246         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 247         call    %l7
 248          add    %sp, (2047 + 128), %o0          ! argument array
 249
 250         mov     (1b - prom_callmethod_name), %l1
 251         mov     (1b - prom_translate_name), %l2
 252         sub     %l0, %l1, %l1
 253         sub     %l0, %l2, %l2
 254         lduw    [%l5], %l5                      ! prom_mmu_ihandle_cache
 255
 256         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "call-method"
 257         mov     3, %l3
 258         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 3
 259         mov     5, %l3
 260         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 5
 261         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1: "translate"
 262         stx     %l5, [%sp + 2047 + 128 + 0x20]  ! arg2: prom_mmu_ihandle_cache
 263         /* PAGE align */
 264         srlx    %l0, 13, %l3
 265         sllx    %l3, 13, %l3
 266         stx     %l3, [%sp + 2047 + 128 + 0x28]  ! arg3: vaddr, our PC
 267         stx     %g0, [%sp + 2047 + 128 + 0x30]  ! res1
 268         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! res2
 269         stx     %g0, [%sp + 2047 + 128 + 0x40]  ! res3
 270         stx     %g0, [%sp + 2047 + 128 + 0x48]  ! res4
 271         stx     %g0, [%sp + 2047 + 128 + 0x50]  ! res5
 272         call    %l7
 273          add    %sp, (2047 + 128), %o0          ! argument array
 274
 275         ldx     [%sp + 2047 + 128 + 0x40], %l1  ! translation mode
 276         mov     (1b - prom_boot_mapping_mode), %l4
 277         sub     %l0, %l4, %l4
 278         stw     %l1, [%l4]
 279         mov     (1b - prom_boot_mapping_phys_high), %l4
 280         sub     %l0, %l4, %l4
 281         ldx     [%sp + 2047 + 128 + 0x48], %l2  ! physaddr high
 282         stx     %l2, [%l4 + 0x0]
 283         ldx     [%sp + 2047 + 128 + 0x50], %l3  ! physaddr low
 284         /* 4MB align */
 285         srlx    %l3, ILOG2_4MB, %l3
 286         sllx    %l3, ILOG2_4MB, %l3
 287         stx     %l3, [%l4 + 0x8]
 288
 289         /* Leave service as-is, "call-method" */
 290         mov     7, %l3
 291         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 7
 292         mov     1, %l3
 293         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 294         mov     (1b - prom_map_name), %l3
 295         sub     %l0, %l3, %l3
 296         stx     %l3, [%sp + 2047 + 128 + 0x18]  ! arg1: "map"
 297         /* Leave arg2 as-is, prom_mmu_ihandle_cache */
 298         mov     -1, %l3
 299         stx     %l3, [%sp + 2047 + 128 + 0x28]  ! arg3: mode (-1 default)
 300         /* 4MB align the kernel image size. */
 301         set     (_end - KERNBASE), %l3
 302         set     ((4 * 1024 * 1024) - 1), %l4
 303         add     %l3, %l4, %l3
 304         andn    %l3, %l4, %l3
 305         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4: roundup(ksize, 4MB)
 306         sethi   %hi(KERNBASE), %l3
 307         stx     %l3, [%sp + 2047 + 128 + 0x38]  ! arg5: vaddr (KERNBASE)
 308         stx     %g0, [%sp + 2047 + 128 + 0x40]  ! arg6: empty
 309         mov     (1b - prom_boot_mapping_phys_low), %l3
 310         sub     %l0, %l3, %l3
 311         ldx     [%l3], %l3
 312         stx     %l3, [%sp + 2047 + 128 + 0x48]  ! arg7: phys addr
 313         call    %l7
 314          add    %sp, (2047 + 128), %o0          ! argument array
 315
 316         add     %sp, (192 + 128), %sp
 317
 318         sethi   %hi(prom_root_compatible), %g1
 319         or      %g1, %lo(prom_root_compatible), %g1
 320         sethi   %hi(prom_sun4v_name), %g7
 321         or      %g7, %lo(prom_sun4v_name), %g7
 322         mov     5, %g3
 323 90:     ldub    [%g7], %g2
 324         ldub    [%g1], %g4
 325         cmp     %g2, %g4
 326         bne,pn  %icc, 80f
 327          add    %g7, 1, %g7
 328         subcc   %g3, 1, %g3
 329         bne,pt  %xcc, 90b
 330          add    %g1, 1, %g1
 331
 332         sethi   %hi(is_sun4v), %g1
 333         or      %g1, %lo(is_sun4v), %g1
 334         mov     1, %g7
 335         stw     %g7, [%g1]
 336
 337         /* cpu_node = prom_finddevice("/cpu") */
 338         mov     (1b - prom_finddev_name), %l1
 339         mov     (1b - prom_cpu_path), %l2
 340         sub     %l0, %l1, %l1
 341         sub     %l0, %l2, %l2
 342         sub     %sp, (192 + 128), %sp
 343
 344         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "finddevice"
 345         mov     1, %l3
 346         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 1
 347         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 348         stx     %l2, [%sp + 2047 + 128 + 0x18]  ! arg1, "/cpu"
 349         stx     %g0, [%sp + 2047 + 128 + 0x20]  ! ret1
 350         call    %l7
 351          add    %sp, (2047 + 128), %o0          ! argument array
 352
 353         ldx     [%sp + 2047 + 128 + 0x20], %l4  ! cpu device node
 354
 355         mov     (1b - prom_getprop_name), %l1
 356         mov     (1b - prom_compatible_name), %l2
 357         mov     (1b - prom_cpu_compatible), %l5
 358         sub     %l0, %l1, %l1
 359         sub     %l0, %l2, %l2
 360         sub     %l0, %l5, %l5
 361
 362         /* prom_getproperty(cpu_node, "compatible",
 363          *                  &prom_cpu_compatible, 64)
 364          */
 365         stx     %l1, [%sp + 2047 + 128 + 0x00]  ! service, "getprop"
 366         mov     4, %l3
 367         stx     %l3, [%sp + 2047 + 128 + 0x08]  ! num_args, 4
 368         mov     1, %l3
 369         stx     %l3, [%sp + 2047 + 128 + 0x10]  ! num_rets, 1
 370         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! arg1, cpu_node
 371         stx     %l2, [%sp + 2047 + 128 + 0x20]  ! arg2, "compatible"
 372         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! arg3, &prom_cpu_compatible
 373         mov     64, %l3
 374         stx     %l3, [%sp + 2047 + 128 + 0x30]  ! arg4, size
 375         stx     %g0, [%sp + 2047 + 128 + 0x38]  ! ret1
 376         call    %l7
 377          add    %sp, (2047 + 128), %o0          ! argument array
 378
 379         add     %sp, (192 + 128), %sp
 380
 381         sethi   %hi(prom_cpu_compatible), %g1
 382         or      %g1, %lo(prom_cpu_compatible), %g1
 383         sethi   %hi(prom_niagara_prefix), %g7
 384         or      %g7, %lo(prom_niagara_prefix), %g7
 385         mov     17, %g3
 386 90:     ldub    [%g7], %g2
 387         ldub    [%g1], %g4
 388         cmp     %g2, %g4
 389         bne,pn  %icc, 89f
 390          add    %g7, 1, %g7
 391         subcc   %g3, 1, %g3
 392         bne,pt  %xcc, 90b
 393          add    %g1, 1, %g1
 394         ba,pt   %xcc, 91f
 395          nop
 396
 397 89:     sethi   %hi(prom_cpu_compatible), %g1
 398         or      %g1, %lo(prom_cpu_compatible), %g1
 399         sethi   %hi(prom_sparc_prefix), %g7
 400         or      %g7, %lo(prom_sparc_prefix), %g7
 401         mov     6, %g3
 402 90:     ldub    [%g7], %g2
 403         ldub    [%g1], %g4
 404         cmp     %g2, %g4
 405         bne,pn  %icc, 4f
 406          add    %g7, 1, %g7
 407         subcc   %g3, 1, %g3
 408         bne,pt  %xcc, 90b
 409          add    %g1, 1, %g1
 410
 411         sethi   %hi(prom_cpu_compatible), %g1
 412         or      %g1, %lo(prom_cpu_compatible), %g1
 413         ldub    [%g1 + 6], %g2
 414         cmp     %g2, 'T'
 415         be,pt   %xcc, 70f
 416          cmp    %g2, 'M'
 417         bne,pn  %xcc, 49f
 418          nop
 419
 420 70:     ldub    [%g1 + 7], %g2
 421         cmp     %g2, '3'
 422         be,pt   %xcc, 5f
 423          mov    SUN4V_CHIP_NIAGARA3, %g4
 424         cmp     %g2, '4'
 425         be,pt   %xcc, 5f
 426          mov    SUN4V_CHIP_NIAGARA4, %g4
 427         cmp     %g2, '5'
 428         be,pt   %xcc, 5f
 429          mov    SUN4V_CHIP_NIAGARA5, %g4
 430         ba,pt   %xcc, 49f
 431          nop
 432
 433 91:     sethi   %hi(prom_cpu_compatible), %g1
 434         or      %g1, %lo(prom_cpu_compatible), %g1
 435         ldub    [%g1 + 17], %g2
 436         cmp     %g2, '1'
 437         be,pt   %xcc, 5f
 438          mov    SUN4V_CHIP_NIAGARA1, %g4
 439         cmp     %g2, '2'
 440         be,pt   %xcc, 5f
 441          mov    SUN4V_CHIP_NIAGARA2, %g4
 442
 443 4:
 444         /* Athena */
 445         sethi   %hi(prom_cpu_compatible), %g1
 446         or      %g1, %lo(prom_cpu_compatible), %g1
 447         sethi   %hi(prom_sparc64x_prefix), %g7
 448         or      %g7, %lo(prom_sparc64x_prefix), %g7
 449         mov     9, %g3
 450 41:     ldub    [%g7], %g2
 451         ldub    [%g1], %g4
 452         cmp     %g2, %g4
 453         bne,pn  %icc, 49f
 454         add     %g7, 1, %g7
 455         subcc   %g3, 1, %g3
 456         bne,pt  %xcc, 41b
 457         add     %g1, 1, %g1
 458         mov     SUN4V_CHIP_SPARC64X, %g4
 459         ba,pt   %xcc, 5f
 460         nop
 461
 462 49:
 463         mov     SUN4V_CHIP_UNKNOWN, %g4
 464 5:      sethi   %hi(sun4v_chip_type), %g2
 465         or      %g2, %lo(sun4v_chip_type), %g2
 466         stw     %g4, [%g2]
 467
 468 80:
 469         BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
 470         BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
 471         BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
 472         ba,pt   %xcc, spitfire_boot
 473          nop
 474
 475 cheetah_plus_boot:
 476         /* Preserve OBP chosen DCU and DCR register settings.  */
 477         ba,pt   %xcc, cheetah_generic_boot
 478          nop
 479
 480 cheetah_boot:
 481         mov     DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
 482         wr      %g1, %asr18
 483
 484         sethi   %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
 485         or      %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
 486         sllx    %g7, 32, %g7
 487         or      %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
 488         stxa    %g7, [%g0] ASI_DCU_CONTROL_REG
 489         membar  #Sync
 490
 491 cheetah_generic_boot:
 492         mov     TSB_EXTENSION_P, %g3
 493         stxa    %g0, [%g3] ASI_DMMU
 494         stxa    %g0, [%g3] ASI_IMMU
 495         membar  #Sync
 496
 497         mov     TSB_EXTENSION_S, %g3
 498         stxa    %g0, [%g3] ASI_DMMU
 499         membar  #Sync
 500
 501         mov     TSB_EXTENSION_N, %g3
 502         stxa    %g0, [%g3] ASI_DMMU
 503         stxa    %g0, [%g3] ASI_IMMU
 504         membar  #Sync
 505
 506         ba,a,pt %xcc, jump_to_sun4u_init
 507
 508 spitfire_boot:
 509         /* Typically PROM has already enabled both MMU's and both on-chip
 510          * caches, but we do it here anyway just to be paranoid.
 511          */
 512         mov     (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
 513         stxa    %g1, [%g0] ASI_LSU_CONTROL
 514         membar  #Sync
 515
 516 jump_to_sun4u_init:
 517         /*
 518          * Make sure we are in privileged mode, have address masking,
 519          * using the ordinary globals and have enabled floating
 520          * point.
 521          *
 522          * Again, typically PROM has left %pil at 13 or similar, and
 523          * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
 524          */
 525         wrpr    %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
 526         wr      %g0, 0, %fprs
 527
 528         set     sun4u_init, %g2
 529         jmpl    %g2 + %g0, %g0
 530          nop
 531
 532         __REF
 533 sun4u_init:
 534         BRANCH_IF_SUN4V(g1, sun4v_init)
 535
 536         /* Set ctx 0 */
 537         mov             PRIMARY_CONTEXT, %g7
 538         stxa            %g0, [%g7] ASI_DMMU
 539         membar          #Sync
 540
 541         mov             SECONDARY_CONTEXT, %g7
 542         stxa            %g0, [%g7] ASI_DMMU
 543         membar  #Sync
 544
 545         ba,pt           %xcc, sun4u_continue
 546          nop
 547
 548 sun4v_init:
 549         /* Set ctx 0 */
 550         mov             PRIMARY_CONTEXT, %g7
 551         stxa            %g0, [%g7] ASI_MMU
 552         membar          #Sync
 553
 554         mov             SECONDARY_CONTEXT, %g7
 555         stxa            %g0, [%g7] ASI_MMU
 556         membar          #Sync
 557         ba,pt           %xcc, niagara_tlb_fixup
 558          nop
 559
 560 sun4u_continue:
 561         BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
 562
 563         ba,pt   %xcc, spitfire_tlb_fixup
 564          nop
 565
 566 niagara_tlb_fixup:
 567         mov     3, %g2          /* Set TLB type to hypervisor. */
 568         sethi   %hi(tlb_type), %g1
 569         stw     %g2, [%g1 + %lo(tlb_type)]
 570
 571         /* Patch copy/clear ops.  */
 572         sethi   %hi(sun4v_chip_type), %g1
 573         lduw    [%g1 + %lo(sun4v_chip_type)], %g1
 574         cmp     %g1, SUN4V_CHIP_NIAGARA1
 575         be,pt   %xcc, niagara_patch
 576          cmp    %g1, SUN4V_CHIP_NIAGARA2
 577         be,pt   %xcc, niagara2_patch
 578          nop
 579         cmp     %g1, SUN4V_CHIP_NIAGARA3
 580         be,pt   %xcc, niagara2_patch
 581          nop
 582         cmp     %g1, SUN4V_CHIP_NIAGARA4
 583         be,pt   %xcc, niagara4_patch
 584          nop
 585         cmp     %g1, SUN4V_CHIP_NIAGARA5
 586         be,pt   %xcc, niagara4_patch
 587          nop
 588
 589         call    generic_patch_copyops
 590          nop
 591         call    generic_patch_bzero
 592          nop
 593         call    generic_patch_pageops
 594          nop
 595
 596         ba,a,pt %xcc, 80f
 597 niagara4_patch:
 598         call    niagara4_patch_copyops
 599          nop
 600         call    niagara4_patch_bzero
 601          nop
 602         call    niagara4_patch_pageops
 603          nop
 604
 605         ba,a,pt %xcc, 80f
 606
 607 niagara2_patch:
 608         call    niagara2_patch_copyops
 609          nop
 610         call    niagara_patch_bzero
 611          nop
 612         call    niagara_patch_pageops
 613          nop
 614
 615         ba,a,pt %xcc, 80f
 616
 617 niagara_patch:
 618         call    niagara_patch_copyops
 619          nop
 620         call    niagara_patch_bzero
 621          nop
 622         call    niagara_patch_pageops
 623          nop
 624
 625 80:
 626         /* Patch TLB/cache ops.  */
 627         call    hypervisor_patch_cachetlbops
 628          nop
 629
 630         ba,pt   %xcc, tlb_fixup_done
 631          nop
 632
 633 cheetah_tlb_fixup:
 634         mov     2, %g2          /* Set TLB type to cheetah+. */
 635         BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
 636
 637         mov     1, %g2          /* Set TLB type to cheetah. */
 638
 639 1:      sethi   %hi(tlb_type), %g1
 640         stw     %g2, [%g1 + %lo(tlb_type)]
 641
 642         /* Patch copy/page operations to cheetah optimized versions. */
 643         call    cheetah_patch_copyops
 644          nop
 645         call    cheetah_patch_copy_page
 646          nop
 647         call    cheetah_patch_cachetlbops
 648          nop
 649
 650         ba,pt   %xcc, tlb_fixup_done
 651          nop
 652
 653 spitfire_tlb_fixup:
 654         /* Set TLB type to spitfire. */
 655         mov     0, %g2
 656         sethi   %hi(tlb_type), %g1
 657         stw     %g2, [%g1 + %lo(tlb_type)]
 658
 659 tlb_fixup_done:
 660         sethi   %hi(init_thread_union), %g6
 661         or      %g6, %lo(init_thread_union), %g6
 662         ldx     [%g6 + TI_TASK], %g4
 663         mov     %sp, %l6
 664
 665         wr      %g0, ASI_P, %asi
 666         mov     1, %g1
 667         sllx    %g1, THREAD_SHIFT, %g1
 668         sub     %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
 669         add     %g6, %g1, %sp
 670         mov     0, %fp
 671
 672         /* Set per-cpu pointer initially to zero, this makes
 673          * the boot-cpu use the in-kernel-image per-cpu areas
 674          * before setup_per_cpu_area() is invoked.
 675          */
 676         clr     %g5
 677
 678         wrpr    %g0, 0, %wstate
 679         wrpr    %g0, 0x0, %tl
 680
 681         /* Clear the bss */
 682         sethi   %hi(__bss_start), %o0
 683         or      %o0, %lo(__bss_start), %o0
 684         sethi   %hi(_end), %o1
 685         or      %o1, %lo(_end), %o1
 686         call    __bzero
 687          sub    %o1, %o0, %o1
 688
 689 #ifdef CONFIG_LOCKDEP
 690         /* We have this call this super early, as even prom_init can grab
 691          * spinlocks and thus call into the lockdep code.
 692          */
 693         call    lockdep_init
 694          nop
 695 #endif
 696
 697         mov     %l6, %o1                        ! OpenPROM stack
 698         call    prom_init
 699          mov    %l7, %o0                        ! OpenPROM cif handler
 700
 701         /* Initialize current_thread_info()->cpu as early as possible.
 702          * In order to do that accurately we have to patch up the get_cpuid()
 703          * assembler sequences.  And that, in turn, requires that we know
 704          * if we are on a Starfire box or not.  While we're here, patch up
 705          * the sun4v sequences as well.
 706          */
 707         call    check_if_starfire
 708          nop
 709         call    per_cpu_patch
 710          nop
 711         call    sun4v_patch
 712          nop
 713
 714 #ifdef CONFIG_SMP
 715         call    hard_smp_processor_id
 716          nop
 717         cmp     %o0, NR_CPUS
 718         blu,pt  %xcc, 1f
 719          nop
 720         call    boot_cpu_id_too_large
 721          nop
 722         /* Not reached... */
 723
 724 1:
 725 #else
 726         mov     0, %o0
 727 #endif
 728         sth     %o0, [%g6 + TI_CPU]
 729
 730         call    prom_init_report
 731          nop
 732
 733         /* Off we go.... */
 734         call    start_kernel
 735          nop
 736         /* Not reached... */
 737
 738         .previous
 739
 740         /* This is meant to allow the sharing of this code between
 741          * boot processor invocation (via setup_tba() below) and
 742          * secondary processor startup (via trampoline.S).  The
 743          * former does use this code, the latter does not yet due
 744          * to some complexities.  That should be fixed up at some
 745          * point.
 746          *
 747          * There used to be enormous complexity wrt. transferring
 748          * over from the firmware's trap table to the Linux kernel's.
 749          * For example, there was a chicken & egg problem wrt. building
 750          * the OBP page tables, yet needing to be on the Linux kernel
 751          * trap table (to translate PAGE_OFFSET addresses) in order to
 752          * do that.
 753          *
 754          * We now handle OBP tlb misses differently, via linear lookups
 755          * into the prom_trans[] array.  So that specific problem no
 756          * longer exists.  Yet, unfortunately there are still some issues
 757          * preventing trampoline.S from using this code... ho hum.
 758          */
 759         .globl  setup_trap_table
 760 setup_trap_table:
 761         save    %sp, -192, %sp
 762
 763         /* Force interrupts to be disabled. */
 764         rdpr    %pstate, %l0
 765         andn    %l0, PSTATE_IE, %o1
 766         wrpr    %o1, 0x0, %pstate
 767         rdpr    %pil, %l1
 768         wrpr    %g0, PIL_NORMAL_MAX, %pil
 769
 770         /* Make the firmware call to jump over to the Linux trap table.  */
 771         sethi   %hi(is_sun4v), %o0
 772         lduw    [%o0 + %lo(is_sun4v)], %o0
 773         brz,pt  %o0, 1f
 774          nop
 775
 776         TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
 777         add     %g2, TRAP_PER_CPU_FAULT_INFO, %g2
 778         stxa    %g2, [%g0] ASI_SCRATCHPAD
 779
 780         /* Compute physical address:
 781          *
 782          * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
 783          */
 784         sethi   %hi(KERNBASE), %g3
 785         sub     %g2, %g3, %g2
 786         sethi   %hi(kern_base), %g3
 787         ldx     [%g3 + %lo(kern_base)], %g3
 788         add     %g2, %g3, %o1
 789         sethi   %hi(sparc64_ttable_tl0), %o0
 790
 791         set     prom_set_trap_table_name, %g2
 792         stx     %g2, [%sp + 2047 + 128 + 0x00]
 793         mov     2, %g2
 794         stx     %g2, [%sp + 2047 + 128 + 0x08]
 795         mov     0, %g2
 796         stx     %g2, [%sp + 2047 + 128 + 0x10]
 797         stx     %o0, [%sp + 2047 + 128 + 0x18]
 798         stx     %o1, [%sp + 2047 + 128 + 0x20]
 799         sethi   %hi(p1275buf), %g2
 800         or      %g2, %lo(p1275buf), %g2
 801         ldx     [%g2 + 0x08], %o1
 802         call    %o1
 803          add    %sp, (2047 + 128), %o0
 804
 805         ba,pt   %xcc, 2f
 806          nop
 807
 808 1:      sethi   %hi(sparc64_ttable_tl0), %o0
 809         set     prom_set_trap_table_name, %g2
 810         stx     %g2, [%sp + 2047 + 128 + 0x00]
 811         mov     1, %g2
 812         stx     %g2, [%sp + 2047 + 128 + 0x08]
 813         mov     0, %g2
 814         stx     %g2, [%sp + 2047 + 128 + 0x10]
 815         stx     %o0, [%sp + 2047 + 128 + 0x18]
 816         sethi   %hi(p1275buf), %g2
 817         or      %g2, %lo(p1275buf), %g2
 818         ldx     [%g2 + 0x08], %o1
 819         call    %o1
 820          add    %sp, (2047 + 128), %o0
 821
 822         /* Start using proper page size encodings in ctx register.  */
 823 2:      sethi   %hi(sparc64_kern_pri_context), %g3
 824         ldx     [%g3 + %lo(sparc64_kern_pri_context)], %g2
 825
 826         mov             PRIMARY_CONTEXT, %g1
 827
 828 661:    stxa            %g2, [%g1] ASI_DMMU
 829         .section        .sun4v_1insn_patch, "ax"
 830         .word           661b
 831         stxa            %g2, [%g1] ASI_MMU
 832         .previous
 833
 834         membar  #Sync
 835
 836         BRANCH_IF_SUN4V(o2, 1f)
 837
 838         /* Kill PROM timer */
 839         sethi   %hi(0x80000000), %o2
 840         sllx    %o2, 32, %o2
 841         wr      %o2, 0, %tick_cmpr
 842
 843         BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
 844
 845         ba,pt   %xcc, 2f
 846          nop
 847
 848         /* Disable STICK_INT interrupts. */
 849 1:
 850         sethi   %hi(0x80000000), %o2
 851         sllx    %o2, 32, %o2
 852         wr      %o2, %asr25
 853
 854 2:
 855         wrpr    %g0, %g0, %wstate
 856
 857         call    init_irqwork_curcpu
 858          nop
 859
 860         /* Now we can restore interrupt state. */
 861         wrpr    %l0, 0, %pstate
 862         wrpr    %l1, 0x0, %pil
 863
 864         ret
 865          restore
 866
 867         .globl  setup_tba
 868 setup_tba:
 869         save    %sp, -192, %sp
 870
 871         /* The boot processor is the only cpu which invokes this
 872          * routine, the other cpus set things up via trampoline.S.
 873          * So save the OBP trap table address here.
 874          */
 875         rdpr    %tba, %g7
 876         sethi   %hi(prom_tba), %o1
 877         or      %o1, %lo(prom_tba), %o1
 878         stx     %g7, [%o1]
 879
 880         call    setup_trap_table
 881          nop
 882
 883         ret
 884          restore
 885 sparc64_boot_end:
 886
 887 #include "etrap_64.S"
 888 #include "rtrap_64.S"
 889 #include "winfixup.S"
 890 #include "fpu_traps.S"
 891 #include "ivec.S"
 892 #include "getsetcc.S"
 893 #include "utrap.S"
 894 #include "spiterrs.S"
 895 #include "cherrs.S"
 896 #include "misctrap.S"
 897 #include "syscalls.S"
 898 #include "helpers.S"
 899 #include "hvcalls.S"
 900 #include "sun4v_tlb_miss.S"
 901 #include "sun4v_ivec.S"
 902 #include "ktlb.S"
 903 #include "tsb.S"
 904
 905 /*
 906  * The following skip makes sure the trap table in ttable.S is aligned
 907  * on a 32K boundary as required by the v9 specs for TBA register.
 908  *
 909  * We align to a 32K boundary, then we have the 32K kernel TSB,
 910  * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
 911  */
 912 1:
 913         .skip   0x4000 + _start - 1b
 914
 915 ! 0x0000000000408000
 916
 917         .globl  swapper_tsb
 918 swapper_tsb:
 919         .skip   (32 * 1024)
 920
 921         .globl  swapper_4m_tsb
 922 swapper_4m_tsb:
 923         .skip   (64 * 1024)
 924
 925 ! 0x0000000000420000
 926
 927         /* Some care needs to be exercised if you try to move the
 928          * location of the trap table relative to other things.  For
 929          * one thing there are br* instructions in some of the
 930          * trap table entires which branch back to code in ktlb.S
 931          * Those instructions can only handle a signed 16-bit
 932          * displacement.
 933          *
 934          * There is a binutils bug (bugzilla #4558) which causes
 935          * the relocation overflow checks for such instructions to
 936          * not be done correctly.  So bintuils will not notice the
 937          * error and will instead write junk into the relocation and
 938          * you'll have an unbootable kernel.
 939          */
 940 #include "ttable_64.S"
 941
 942 ! 0x0000000000428000
 943
 944 #include "systbls_64.S"
 945
 946         .data
 947         .align  8
 948         .globl  prom_tba, tlb_type
 949 prom_tba:       .xword  0
 950 tlb_type:       .word   0       /* Must NOT end up in BSS */
 951         .section        ".fixup",#alloc,#execinstr
 952
 953         .globl  __ret_efault, __retl_efault, __ret_one, __retl_one
 954 ENTRY(__ret_efault)
 955         ret
 956          restore %g0, -EFAULT, %o0
 957 ENDPROC(__ret_efault)
 958
 959 ENTRY(__retl_efault)
 960         retl
 961          mov    -EFAULT, %o0
 962 ENDPROC(__retl_efault)
 963
 964 ENTRY(__retl_one)
 965         retl
 966          mov    1, %o0
 967 ENDPROC(__retl_one)
 968
 969 ENTRY(__ret_one_asi)
 970         wr      %g0, ASI_AIUS, %asi
 971         ret
 972          restore %g0, 1, %o0
 973 ENDPROC(__ret_one_asi)
 974
 975 ENTRY(__retl_one_asi)
 976         wr      %g0, ASI_AIUS, %asi
 977         retl
 978          mov    1, %o0
 979 ENDPROC(__retl_one_asi)
 980
 981 ENTRY(__retl_o1)
 982         retl
 983          mov    %o1, %o0
 984 ENDPROC(__retl_o1)