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 /*
  47  * This is used to identify the board type from a given PReP board
  48  * vendor. Board revision is also made available. This will be moved
  49  * elsewhere soon
  50  */
  51 extern unsigned char ucBoardRev;
  52 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  53
  54 #endif /* CONFIG_PPC_PREP */
  55
  56 #ifndef CONFIG_PPC_MULTIPLATFORM
  57 #define _machine 0
  58 #endif /* CONFIG_PPC_MULTIPLATFORM */
  59
  60 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  61
  62 /*
  63  * Default implementation of macro that returns current
  64  * instruction pointer ("program counter").
  65  */
  66 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  67
  68 /* Macros for adjusting thread priority (hardware multi-threading) */
  69 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  70 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  71 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  72 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  73 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  74 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  75
  76 #ifdef __KERNEL__
  77
  78 extern int have_of;
  79
  80 struct task_struct;
  81 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  82 void release_thread(struct task_struct *);
  83
  84 /* Prepare to copy thread state - unlazy all lazy status */
  85 extern void prepare_to_copy(struct task_struct *tsk);
  86
  87 /* Create a new kernel thread. */
  88 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  89
  90 /* Lazy FPU handling on uni-processor */
  91 extern struct task_struct *last_task_used_math;
  92 extern struct task_struct *last_task_used_altivec;
  93 extern struct task_struct *last_task_used_spe;
  94
  95 #ifdef CONFIG_PPC32
  96 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  97
  98 /* This decides where the kernel will search for a free chunk of vm
  99  * space during mmap's.
 100  */
 101 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 102 #endif
 103
 104 #ifdef CONFIG_PPC64
 105 /* 64-bit user address space is 44-bits (16TB user VM) */
 106 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 107
 108 /*
 109  * 32-bit user address space is 4GB - 1 page
 110  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 111  */
 112 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 113
 114 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
 115                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 116
 117 /* This decides where the kernel will search for a free chunk of vm
 118  * space during mmap's.
 119  */
 120 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 121 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 122
 123 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 124                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 125 #endif
 126
 127 typedef struct {
 128         unsigned long seg;
 129 } mm_segment_t;
 130
 131 struct thread_struct {
 132         unsigned long   ksp;            /* Kernel stack pointer */
 133 #ifdef CONFIG_PPC64
 134         unsigned long   ksp_vsid;
 135 #endif
 136         struct pt_regs  *regs;          /* Pointer to saved register state */
 137         mm_segment_t    fs;             /* for get_fs() validation */
 138 #ifdef CONFIG_PPC32
 139         void            *pgdir;         /* root of page-table tree */
 140         signed long     last_syscall;
 141 #endif
 142 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 143         unsigned long   dbcr0;          /* debug control register values */
 144         unsigned long   dbcr1;
 145 #endif
 146         double          fpr[32];        /* Complete floating point set */
 147         struct {                        /* fpr ... fpscr must be contiguous */
 148
 149                 unsigned int pad;
 150                 unsigned int val;       /* Floating point status */
 151         } fpscr;
 152         int             fpexc_mode;     /* floating-point exception mode */
 153         unsigned int    align_ctl;      /* alignment handling control */
 154 #ifdef CONFIG_PPC64
 155         unsigned long   start_tb;       /* Start purr when proc switched in */
 156         unsigned long   accum_tb;       /* Total accumilated purr for process */
 157 #endif
 158         unsigned long   dabr;           /* Data address breakpoint register */
 159 #ifdef CONFIG_ALTIVEC
 160         /* Complete AltiVec register set */
 161         vector128       vr[32] __attribute((aligned(16)));
 162         /* AltiVec status */
 163         vector128       vscr __attribute((aligned(16)));
 164         unsigned long   vrsave;
 165         int             used_vr;        /* set if process has used altivec */
 166 #endif /* CONFIG_ALTIVEC */
 167 #ifdef CONFIG_SPE
 168         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 169         u64             acc;            /* Accumulator */
 170         unsigned long   spefscr;        /* SPE & eFP status */
 171         int             used_spe;       /* set if process has used spe */
 172 #endif /* CONFIG_SPE */
 173 };
 174
 175 #define ARCH_MIN_TASKALIGN 16
 176
 177 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 178
 179
 180 #ifdef CONFIG_PPC32
 181 #define INIT_THREAD { \
 182         .ksp = INIT_SP, \
 183         .fs = KERNEL_DS, \
 184         .pgdir = swapper_pg_dir, \
 185         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 186 }
 187 #else
 188 #define INIT_THREAD  { \
 189         .ksp = INIT_SP, \
 190         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 191         .fs = KERNEL_DS, \
 192         .fpr = {0}, \
 193         .fpscr = { .val = 0, }, \
 194         .fpexc_mode = 0, \
 195 }
 196 #endif
 197
 198 /*
 199  * Return saved PC of a blocked thread. For now, this is the "user" PC
 200  */
 201 #define thread_saved_pc(tsk)    \
 202         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 203
 204 unsigned long get_wchan(struct task_struct *p);
 205
 206 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 207 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 208
 209 /* Get/set floating-point exception mode */
 210 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 211 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 212
 213 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 214 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 215
 216 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 217 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 218
 219 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 220 extern int set_endian(struct task_struct *tsk, unsigned int val);
 221
 222 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 223 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 224
 225 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 226 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 227
 228 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 229 {
 230         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 231 }
 232
 233 static inline unsigned long __pack_fe01(unsigned int fpmode)
 234 {
 235         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 236 }
 237
 238 #ifdef CONFIG_PPC64
 239 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 240 #else
 241 #define cpu_relax()     barrier()
 242 #endif
 243
 244 /* Check that a certain kernel stack pointer is valid in task_struct p */
 245 int validate_sp(unsigned long sp, struct task_struct *p,
 246                        unsigned long nbytes);
 247
 248 /*
 249  * Prefetch macros.
 250  */
 251 #define ARCH_HAS_PREFETCH
 252 #define ARCH_HAS_PREFETCHW
 253 #define ARCH_HAS_SPINLOCK_PREFETCH
 254
 255 static inline void prefetch(const void *x)
 256 {
 257         if (unlikely(!x))
 258                 return;
 259
 260         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 261 }
 262
 263 static inline void prefetchw(const void *x)
 264 {
 265         if (unlikely(!x))
 266                 return;
 267
 268         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 269 }
 270
 271 #define spin_lock_prefetch(x)   prefetchw(x)
 272
 273 #ifdef CONFIG_PPC64
 274 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 275 #endif
 276
 277 #endif /* __KERNEL__ */
 278 #endif /* __ASSEMBLY__ */
 279 #endif /* _ASM_POWERPC_PROCESSOR_H */