LXR linux/arch/powerpc/include/asm/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#ifdef CONFIG_VSX
  16#define TS_FPRWIDTH 2
  17#else
  18#define TS_FPRWIDTH 1
  19#endif
  20
  21#ifndef __ASSEMBLY__
  22#include <linux/compiler.h>
  23#include <asm/ptrace.h>
  24#include <asm/types.h>
  25
  26/* We do _not_ want to define new machine types at all, those must die
  27 * in favor of using the device-tree
  28 * -- BenH.
  29 */
  30
  31/* PREP sub-platform types see residual.h for these */
  32#define _PREP_Motorola  0x01    /* motorola prep */
  33#define _PREP_Firm      0x02    /* firmworks prep */
  34#define _PREP_IBM       0x00    /* ibm prep */
  35#define _PREP_Bull      0x03    /* bull prep */
  36
  37/* CHRP sub-platform types. These are arbitrary */
  38#define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  39#define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  40#define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  41#define _CHRP_briq      0x07    /* TotalImpact's briQ */
  42
  43#if defined(__KERNEL__) && defined(CONFIG_PPC32)
  44
  45extern int _chrp_type;
  46
  47#ifdef CONFIG_PPC_PREP
  48
  49/* what kind of prep workstation we are */
  50extern int _prep_type;
  51
  52#endif /* CONFIG_PPC_PREP */
  53
  54#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  55
  56/*
  57 * Default implementation of macro that returns current
  58 * instruction pointer ("program counter").
  59 */
  60#define current_text_addr() ({ __label__ _l; _l: &&_l;})
  61
  62/* Macros for adjusting thread priority (hardware multi-threading) */
  63#define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  64#define HMT_low()        asm volatile("or 1,1,1      # low priority")
  65#define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  66#define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  67#define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  68#define HMT_high()       asm volatile("or 3,3,3      # high priority")
  69
  70#ifdef __KERNEL__
  71
  72struct task_struct;
  73void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  74void release_thread(struct task_struct *);
  75
  76/* Prepare to copy thread state - unlazy all lazy status */
  77extern void prepare_to_copy(struct task_struct *tsk);
  78
  79/* Create a new kernel thread. */
  80extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  81
  82/* Lazy FPU handling on uni-processor */
  83extern struct task_struct *last_task_used_math;
  84extern struct task_struct *last_task_used_altivec;
  85extern struct task_struct *last_task_used_vsx;
  86extern struct task_struct *last_task_used_spe;
  87
  88#ifdef CONFIG_PPC32
  89
  90#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
  91#error User TASK_SIZE overlaps with KERNEL_START address
  92#endif
  93#define TASK_SIZE       (CONFIG_TASK_SIZE)
  94
  95/* This decides where the kernel will search for a free chunk of vm
  96 * space during mmap's.
  97 */
  98#define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  99#endif
 100
 101#ifdef CONFIG_PPC64
 102/* 64-bit user address space is 44-bits (16TB user VM) */
 103#define TASK_SIZE_USER64 (0x0000100000000000UL)
 104
 105/* 
 106 * 32-bit user address space is 4GB - 1 page 
 107 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 108 */
 109#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 110
 111#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 112                TASK_SIZE_USER32 : TASK_SIZE_USER64)
 113#define TASK_SIZE         TASK_SIZE_OF(current)
 114
 115/* This decides where the kernel will search for a free chunk of vm
 116 * space during mmap's.
 117 */
 118#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 119#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 120
 121#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 122                TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 123#endif
 124
 125#ifdef __KERNEL__
 126#ifdef __powerpc64__
 127
 128#define STACK_TOP_USER64 TASK_SIZE_USER64
 129#define STACK_TOP_USER32 TASK_SIZE_USER32
 130
 131#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
 132                   STACK_TOP_USER32 : STACK_TOP_USER64)
 133
 134#define STACK_TOP_MAX STACK_TOP_USER64
 135
 136#else /* __powerpc64__ */
 137
 138#define STACK_TOP TASK_SIZE
 139#define STACK_TOP_MAX   STACK_TOP
 140
 141#endif /* __powerpc64__ */
 142#endif /* __KERNEL__ */
 143
 144typedef struct {
 145        unsigned long seg;
 146} mm_segment_t;
 147
 148#define TS_FPROFFSET 0
 149#define TS_VSRLOWOFFSET 1
 150#define TS_FPR(i) fpr[i][TS_FPROFFSET]
 151
 152struct thread_struct {
 153        unsigned long   ksp;            /* Kernel stack pointer */
 154        unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 155
 156#ifdef CONFIG_PPC64
 157        unsigned long   ksp_vsid;
 158#endif
 159        struct pt_regs  *regs;          /* Pointer to saved register state */
 160        mm_segment_t    fs;             /* for get_fs() validation */
 161#ifdef CONFIG_PPC32
 162        void            *pgdir;         /* root of page-table tree */
 163#endif
 164#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 165        unsigned long   dbcr0;          /* debug control register values */
 166        unsigned long   dbcr1;
 167#endif
 168        /* FP and VSX 0-31 register set */
 169        double          fpr[32][TS_FPRWIDTH];
 170        struct {
 171
 172                unsigned int pad;
 173                unsigned int val;       /* Floating point status */
 174        } fpscr;
 175        int             fpexc_mode;     /* floating-point exception mode */
 176        unsigned int    align_ctl;      /* alignment handling control */
 177#ifdef CONFIG_PPC64
 178        unsigned long   start_tb;       /* Start purr when proc switched in */
 179        unsigned long   accum_tb;       /* Total accumilated purr for process */
 180#endif
 181        unsigned long   dabr;           /* Data address breakpoint register */
 182#ifdef CONFIG_ALTIVEC
 183        /* Complete AltiVec register set */
 184        vector128       vr[32] __attribute__((aligned(16)));
 185        /* AltiVec status */
 186        vector128       vscr __attribute__((aligned(16)));
 187        unsigned long   vrsave;
 188        int             used_vr;        /* set if process has used altivec */
 189#endif /* CONFIG_ALTIVEC */
 190#ifdef CONFIG_VSX
 191        /* VSR status */
 192        int             used_vsr;       /* set if process has used altivec */
 193#endif /* CONFIG_VSX */
 194#ifdef CONFIG_SPE
 195        unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 196        u64             acc;            /* Accumulator */
 197        unsigned long   spefscr;        /* SPE & eFP status */
 198        int             used_spe;       /* set if process has used spe */
 199#endif /* CONFIG_SPE */
 200};
 201
 202#define ARCH_MIN_TASKALIGN 16
 203
 204#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 205#define INIT_SP_LIMIT \
 206        (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
 207
 208#ifdef CONFIG_SPE
 209#define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
 210#else
 211#define SPEFSCR_INIT
 212#endif
 213
 214#ifdef CONFIG_PPC32
 215#define INIT_THREAD { \
 216        .ksp = INIT_SP, \
 217        .ksp_limit = INIT_SP_LIMIT, \
 218        .fs = KERNEL_DS, \
 219        .pgdir = swapper_pg_dir, \
 220        .fpexc_mode = MSR_FE0 | MSR_FE1, \
 221        SPEFSCR_INIT \
 222}
 223#else
 224#define INIT_THREAD  { \
 225        .ksp = INIT_SP, \
 226        .ksp_limit = INIT_SP_LIMIT, \
 227        .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 228        .fs = KERNEL_DS, \
 229        .fpr = {{0}}, \
 230        .fpscr = { .val = 0, }, \
 231        .fpexc_mode = 0, \
 232}
 233#endif
 234
 235/*
 236 * Return saved PC of a blocked thread. For now, this is the "user" PC
 237 */
 238#define thread_saved_pc(tsk)    \
 239        ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 240
 241#define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.regs)
 242
 243unsigned long get_wchan(struct task_struct *p);
 244
 245#define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 246#define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 247
 248/* Get/set floating-point exception mode */
 249#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 250#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 251
 252extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 253extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 254
 255#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 256#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 257
 258extern int get_endian(struct task_struct *tsk, unsigned long adr);
 259extern int set_endian(struct task_struct *tsk, unsigned int val);
 260
 261#define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 262#define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 263
 264extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 265extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 266
 267static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 268{
 269        return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 270}
 271
 272static inline unsigned long __pack_fe01(unsigned int fpmode)
 273{
 274        return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 275}
 276
 277#ifdef CONFIG_PPC64
 278#define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 279#else
 280#define cpu_relax()     barrier()
 281#endif
 282
 283/* Check that a certain kernel stack pointer is valid in task_struct p */
 284int validate_sp(unsigned long sp, struct task_struct *p,
 285                       unsigned long nbytes);
 286
 287/*
 288 * Prefetch macros.
 289 */
 290#define ARCH_HAS_PREFETCH
 291#define ARCH_HAS_PREFETCHW
 292#define ARCH_HAS_SPINLOCK_PREFETCH
 293
 294static inline void prefetch(const void *x)
 295{
 296        if (unlikely(!x))
 297                return;
 298
 299        __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 300}
 301
 302static inline void prefetchw(const void *x)
 303{
 304        if (unlikely(!x))
 305                return;
 306
 307        __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 308}
 309
 310#define spin_lock_prefetch(x)   prefetchw(x)
 311
 312#ifdef CONFIG_PPC64
 313#define HAVE_ARCH_PICK_MMAP_LAYOUT
 314#endif
 315
 316#ifdef CONFIG_PPC64
 317static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
 318{
 319        unsigned long sp;
 320
 321        if (is_32)
 322                sp = regs->gpr[1] & 0x0ffffffffUL;
 323        else
 324                sp = regs->gpr[1];
 325
 326        return sp;
 327}
 328#else
 329static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
 330{
 331        return regs->gpr[1];
 332}
 333#endif
 334
 335#endif /* __KERNEL__ */
 336#endif /* __ASSEMBLY__ */
 337#endif /* _ASM_POWERPC_PROCESSOR_H */
 338