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 /* Platforms codes (to be obsoleted) */
  26 #define PLATFORM_PSERIES        0x0100
  27 #define PLATFORM_PSERIES_LPAR   0x0101
  28 #define PLATFORM_ISERIES_LPAR   0x0201
  29 #define PLATFORM_LPAR           0x0001
  30 #define PLATFORM_POWERMAC       0x0400
  31 #define PLATFORM_MAPLE          0x0500
  32 #define PLATFORM_PREP           0x0600
  33 #define PLATFORM_CHRP           0x0700
  34 #define PLATFORM_CELL           0x1000
  35
  36 /* Compat platform codes for 32 bits */
  37 #define _MACH_prep      PLATFORM_PREP
  38 #define _MACH_Pmac      PLATFORM_POWERMAC
  39 #define _MACH_chrp      PLATFORM_CHRP
  40
  41 /* PREP sub-platform types see residual.h for these */
  42 #define _PREP_Motorola  0x01    /* motorola prep */
  43 #define _PREP_Firm      0x02    /* firmworks prep */
  44 #define _PREP_IBM       0x00    /* ibm prep */
  45 #define _PREP_Bull      0x03    /* bull prep */
  46
  47 /* CHRP sub-platform types. These are arbitrary */
  48 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  49 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  50 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  51
  52 #ifdef __KERNEL__
  53 #define platform_is_pseries()   (_machine == PLATFORM_PSERIES || \
  54                                  _machine == PLATFORM_PSERIES_LPAR)
  55
  56 #if defined(CONFIG_PPC_MULTIPLATFORM)
  57 extern int _machine;
  58
  59 #ifdef CONFIG_PPC32
  60
  61 /* what kind of prep workstation we are */
  62 extern int _prep_type;
  63 extern int _chrp_type;
  64
  65 /*
  66  * This is used to identify the board type from a given PReP board
  67  * vendor. Board revision is also made available. This will be moved
  68  * elsewhere soon
  69  */
  70 extern unsigned char ucBoardRev;
  71 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  72
  73 #endif /* CONFIG_PPC32 */
  74
  75 #elif defined(CONFIG_PPC_ISERIES)
  76 /*
  77  * iSeries is soon to become MULTIPLATFORM hopefully ...
  78  */
  79 #define _machine PLATFORM_ISERIES_LPAR
  80 #else
  81 #define _machine 0
  82 #endif /* CONFIG_PPC_MULTIPLATFORM */
  83 #endif /* __KERNEL__ */
  84 /*
  85  * Default implementation of macro that returns current
  86  * instruction pointer ("program counter").
  87  */
  88 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  89
  90 /* Macros for adjusting thread priority (hardware multi-threading) */
  91 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  92 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  93 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  94 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  95 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  96 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  97
  98 #ifdef __KERNEL__
  99
 100 extern int have_of;
 101
 102 struct task_struct;
 103 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
 104 void release_thread(struct task_struct *);
 105
 106 /* Prepare to copy thread state - unlazy all lazy status */
 107 extern void prepare_to_copy(struct task_struct *tsk);
 108
 109 /* Create a new kernel thread. */
 110 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 111
 112 /* Lazy FPU handling on uni-processor */
 113 extern struct task_struct *last_task_used_math;
 114 extern struct task_struct *last_task_used_altivec;
 115 extern struct task_struct *last_task_used_spe;
 116
 117 #ifdef CONFIG_PPC32
 118 #define TASK_SIZE       (CONFIG_TASK_SIZE)
 119
 120 /* This decides where the kernel will search for a free chunk of vm
 121  * space during mmap's.
 122  */
 123 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 124 #endif
 125
 126 #ifdef CONFIG_PPC64
 127 /* 64-bit user address space is 44-bits (16TB user VM) */
 128 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 129
 130 /*
 131  * 32-bit user address space is 4GB - 1 page
 132  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 133  */
 134 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 135
 136 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
 137                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 138
 139 /* This decides where the kernel will search for a free chunk of vm
 140  * space during mmap's.
 141  */
 142 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 143 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 144
 145 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 146                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 147 #endif
 148
 149 typedef struct {
 150         unsigned long seg;
 151 } mm_segment_t;
 152
 153 struct thread_struct {
 154         unsigned long   ksp;            /* Kernel stack pointer */
 155 #ifdef CONFIG_PPC64
 156         unsigned long   ksp_vsid;
 157 #endif
 158         struct pt_regs  *regs;          /* Pointer to saved register state */
 159         mm_segment_t    fs;             /* for get_fs() validation */
 160 #ifdef CONFIG_PPC32
 161         void            *pgdir;         /* root of page-table tree */
 162         signed long     last_syscall;
 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         double          fpr[32];        /* Complete floating point set */
 169         struct {                        /* fpr ... fpscr must be contiguous */
 170
 171                 unsigned int pad;
 172                 unsigned int val;       /* Floating point status */
 173         } fpscr;
 174         int             fpexc_mode;     /* floating-point exception mode */
 175 #ifdef CONFIG_PPC64
 176         unsigned long   start_tb;       /* Start purr when proc switched in */
 177         unsigned long   accum_tb;       /* Total accumilated purr for process */
 178 #endif
 179         unsigned long   vdso_base;      /* base of the vDSO library */
 180         unsigned long   dabr;           /* Data address breakpoint register */
 181 #ifdef CONFIG_ALTIVEC
 182         /* Complete AltiVec register set */
 183         vector128       vr[32] __attribute((aligned(16)));
 184         /* AltiVec status */
 185         vector128       vscr __attribute((aligned(16)));
 186         unsigned long   vrsave;
 187         int             used_vr;        /* set if process has used altivec */
 188 #endif /* CONFIG_ALTIVEC */
 189 #ifdef CONFIG_SPE
 190         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 191         u64             acc;            /* Accumulator */
 192         unsigned long   spefscr;        /* SPE & eFP status */
 193         int             used_spe;       /* set if process has used spe */
 194 #endif /* CONFIG_SPE */
 195 };
 196
 197 #define ARCH_MIN_TASKALIGN 16
 198
 199 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 200
 201
 202 #ifdef CONFIG_PPC32
 203 #define INIT_THREAD { \
 204         .ksp = INIT_SP, \
 205         .fs = KERNEL_DS, \
 206         .pgdir = swapper_pg_dir, \
 207         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 208 }
 209 #else
 210 #define INIT_THREAD  { \
 211         .ksp = INIT_SP, \
 212         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 213         .fs = KERNEL_DS, \
 214         .fpr = {0}, \
 215         .fpscr = { .val = 0, }, \
 216         .fpexc_mode = MSR_FE0|MSR_FE1, \
 217 }
 218 #endif
 219
 220 /*
 221  * Return saved PC of a blocked thread. For now, this is the "user" PC
 222  */
 223 #define thread_saved_pc(tsk)    \
 224         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 225
 226 unsigned long get_wchan(struct task_struct *p);
 227
 228 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 229 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 230
 231 /* Get/set floating-point exception mode */
 232 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 233 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 234
 235 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 236 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 237
 238 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 239 {
 240         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 241 }
 242
 243 static inline unsigned long __pack_fe01(unsigned int fpmode)
 244 {
 245         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 246 }
 247
 248 #ifdef CONFIG_PPC64
 249 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 250 #else
 251 #define cpu_relax()     barrier()
 252 #endif
 253
 254 /*
 255  * Prefetch macros.
 256  */
 257 #define ARCH_HAS_PREFETCH
 258 #define ARCH_HAS_PREFETCHW
 259 #define ARCH_HAS_SPINLOCK_PREFETCH
 260
 261 static inline void prefetch(const void *x)
 262 {
 263         if (unlikely(!x))
 264                 return;
 265
 266         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 267 }
 268
 269 static inline void prefetchw(const void *x)
 270 {
 271         if (unlikely(!x))
 272                 return;
 273
 274         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 275 }
 276
 277 #define spin_lock_prefetch(x)   prefetchw(x)
 278
 279 #ifdef CONFIG_PPC64
 280 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 281 #endif
 282
 283 #endif /* __KERNEL__ */
 284 #endif /* __ASSEMBLY__ */
 285 #endif /* _ASM_POWERPC_PROCESSOR_H */