include/asm-powerpc/processor.h

   1 #ifndef _ASM_POWERPC_PROCESSOR_H
   2 #define _ASM_POWERPC_PROCESSOR_H
   3
   4 /*
   5  * Copyright (C) 2001 PPC 64 Team, IBM Corp
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <asm/reg.h>
  14
  15 #ifndef __ASSEMBLY__
  16 #include <linux/compiler.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/types.h>
  19
  20 /* We do _not_ want to define new machine types at all, those must die
  21  * in favor of using the device-tree
  22  * -- BenH.
  23  */
  24
  25 /* PREP sub-platform types see residual.h for these */
  26 #define _PREP_Motorola  0x01    /* motorola prep */
  27 #define _PREP_Firm      0x02    /* firmworks prep */
  28 #define _PREP_IBM       0x00    /* ibm prep */
  29 #define _PREP_Bull      0x03    /* bull prep */
  30
  31 /* CHRP sub-platform types. These are arbitrary */
  32 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  33 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  34 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  35 #define _CHRP_briq      0x07    /* TotalImpact's briQ */
  36
  37 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
  38
  39 extern int _chrp_type;
  40
  41 #ifdef CONFIG_PPC_PREP
  42
  43 /* what kind of prep workstation we are */
  44 extern int _prep_type;
  45
  46 #endif /* CONFIG_PPC_PREP */
  47
  48 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  49
  50 /*
  51  * Default implementation of macro that returns current
  52  * instruction pointer ("program counter").
  53  */
  54 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  55
  56 /* Macros for adjusting thread priority (hardware multi-threading) */
  57 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  58 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  59 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  60 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  61 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  62 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  63
  64 #ifdef __KERNEL__
  65
  66 extern int have_of;
  67
  68 struct task_struct;
  69 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  70 void release_thread(struct task_struct *);
  71
  72 /* Prepare to copy thread state - unlazy all lazy status */
  73 extern void prepare_to_copy(struct task_struct *tsk);
  74
  75 /* Create a new kernel thread. */
  76 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  77
  78 /* Lazy FPU handling on uni-processor */
  79 extern struct task_struct *last_task_used_math;
  80 extern struct task_struct *last_task_used_altivec;
  81 extern struct task_struct *last_task_used_spe;
  82
  83 #ifdef CONFIG_PPC32
  84 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  85
  86 /* This decides where the kernel will search for a free chunk of vm
  87  * space during mmap's.
  88  */
  89 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  90 #endif
  91
  92 #ifdef CONFIG_PPC64
  93 /* 64-bit user address space is 44-bits (16TB user VM) */
  94 #define TASK_SIZE_USER64 (0x0000100000000000UL)
  95
  96 /*
  97  * 32-bit user address space is 4GB - 1 page
  98  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
  99  */
 100 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 101
 102 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 103                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 104 #define TASK_SIZE         TASK_SIZE_OF(current)
 105
 106 /* This decides where the kernel will search for a free chunk of vm
 107  * space during mmap's.
 108  */
 109 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 110 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 111
 112 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 113                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 114 #endif
 115
 116 #ifdef __KERNEL__
 117 #ifdef __powerpc64__
 118
 119 #define STACK_TOP_USER64 TASK_SIZE_USER64
 120 #define STACK_TOP_USER32 TASK_SIZE_USER32
 121
 122 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
 123                    STACK_TOP_USER32 : STACK_TOP_USER64)
 124
 125 #define STACK_TOP_MAX STACK_TOP_USER64
 126
 127 #else /* __powerpc64__ */
 128
 129 #define STACK_TOP TASK_SIZE
 130 #define STACK_TOP_MAX   STACK_TOP
 131
 132 #endif /* __powerpc64__ */
 133 #endif /* __KERNEL__ */
 134
 135 typedef struct {
 136         unsigned long seg;
 137 } mm_segment_t;
 138
 139 struct thread_struct {
 140         unsigned long   ksp;            /* Kernel stack pointer */
 141 #ifdef CONFIG_PPC64
 142         unsigned long   ksp_vsid;
 143 #endif
 144         struct pt_regs  *regs;          /* Pointer to saved register state */
 145         mm_segment_t    fs;             /* for get_fs() validation */
 146 #ifdef CONFIG_PPC32
 147         void            *pgdir;         /* root of page-table tree */
 148 #endif
 149 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 150         unsigned long   dbcr0;          /* debug control register values */
 151         unsigned long   dbcr1;
 152 #endif
 153         double          fpr[32];        /* Complete floating point set */
 154         struct {                        /* fpr ... fpscr must be contiguous */
 155
 156                 unsigned int pad;
 157                 unsigned int val;       /* Floating point status */
 158         } fpscr;
 159         int             fpexc_mode;     /* floating-point exception mode */
 160         unsigned int    align_ctl;      /* alignment handling control */
 161 #ifdef CONFIG_PPC64
 162         unsigned long   start_tb;       /* Start purr when proc switched in */
 163         unsigned long   accum_tb;       /* Total accumilated purr for process */
 164 #endif
 165         unsigned long   dabr;           /* Data address breakpoint register */
 166 #ifdef CONFIG_ALTIVEC
 167         /* Complete AltiVec register set */
 168         vector128       vr[32] __attribute__((aligned(16)));
 169         /* AltiVec status */
 170         vector128       vscr __attribute__((aligned(16)));
 171         unsigned long   vrsave;
 172         int             used_vr;        /* set if process has used altivec */
 173 #endif /* CONFIG_ALTIVEC */
 174 #ifdef CONFIG_SPE
 175         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 176         u64             acc;            /* Accumulator */
 177         unsigned long   spefscr;        /* SPE & eFP status */
 178         int             used_spe;       /* set if process has used spe */
 179 #endif /* CONFIG_SPE */
 180 };
 181
 182 #define ARCH_MIN_TASKALIGN 16
 183
 184 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 185
 186
 187 #ifdef CONFIG_PPC32
 188 #define INIT_THREAD { \
 189         .ksp = INIT_SP, \
 190         .fs = KERNEL_DS, \
 191         .pgdir = swapper_pg_dir, \
 192         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 193 }
 194 #else
 195 #define INIT_THREAD  { \
 196         .ksp = INIT_SP, \
 197         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 198         .fs = KERNEL_DS, \
 199         .fpr = {0}, \
 200         .fpscr = { .val = 0, }, \
 201         .fpexc_mode = 0, \
 202 }
 203 #endif
 204
 205 /*
 206  * Return saved PC of a blocked thread. For now, this is the "user" PC
 207  */
 208 #define thread_saved_pc(tsk)    \
 209         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 210
 211 unsigned long get_wchan(struct task_struct *p);
 212
 213 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 214 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 215
 216 /* Get/set floating-point exception mode */
 217 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 218 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 219
 220 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 221 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 222
 223 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 224 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 225
 226 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 227 extern int set_endian(struct task_struct *tsk, unsigned int val);
 228
 229 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 230 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 231
 232 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 233 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 234
 235 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 236 {
 237         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 238 }
 239
 240 static inline unsigned long __pack_fe01(unsigned int fpmode)
 241 {
 242         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 243 }
 244
 245 #ifdef CONFIG_PPC64
 246 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 247 #else
 248 #define cpu_relax()     barrier()
 249 #endif
 250
 251 /* Check that a certain kernel stack pointer is valid in task_struct p */
 252 int validate_sp(unsigned long sp, struct task_struct *p,
 253                        unsigned long nbytes);
 254
 255 /*
 256  * Prefetch macros.
 257  */
 258 #define ARCH_HAS_PREFETCH
 259 #define ARCH_HAS_PREFETCHW
 260 #define ARCH_HAS_SPINLOCK_PREFETCH
 261
 262 static inline void prefetch(const void *x)
 263 {
 264         if (unlikely(!x))
 265                 return;
 266
 267         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 268 }
 269
 270 static inline void prefetchw(const void *x)
 271 {
 272         if (unlikely(!x))
 273                 return;
 274
 275         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 276 }
 277
 278 #define spin_lock_prefetch(x)   prefetchw(x)
 279
 280 #ifdef CONFIG_PPC64
 281 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 282 #endif
 283
 284 #endif /* __KERNEL__ */
 285 #endif /* __ASSEMBLY__ */
 286 #endif /* _ASM_POWERPC_PROCESSOR_H */