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 <linux/config.h>
  14 #include <asm/reg.h>
  15
  16 #ifndef __ASSEMBLY__
  17 #include <linux/compiler.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/types.h>
  20
  21 /* We do _not_ want to define new machine types at all, those must die
  22  * in favor of using the device-tree
  23  * -- BenH.
  24  */
  25
  26 /* Platforms codes (to be obsoleted) */
  27 #define PLATFORM_PSERIES        0x0100
  28 #define PLATFORM_PSERIES_LPAR   0x0101
  29 #define PLATFORM_ISERIES_LPAR   0x0201
  30 #define PLATFORM_LPAR           0x0001
  31 #define PLATFORM_POWERMAC       0x0400
  32 #define PLATFORM_MAPLE          0x0500
  33 #define PLATFORM_PREP           0x0600
  34 #define PLATFORM_CHRP           0x0700
  35 #define PLATFORM_CELL           0x1000
  36
  37 /* Compat platform codes for 32 bits */
  38 #define _MACH_prep      PLATFORM_PREP
  39 #define _MACH_Pmac      PLATFORM_POWERMAC
  40 #define _MACH_chrp      PLATFORM_CHRP
  41
  42 /* PREP sub-platform types see residual.h for these */
  43 #define _PREP_Motorola  0x01    /* motorola prep */
  44 #define _PREP_Firm      0x02    /* firmworks prep */
  45 #define _PREP_IBM       0x00    /* ibm prep */
  46 #define _PREP_Bull      0x03    /* bull prep */
  47
  48 /* CHRP sub-platform types. These are arbitrary */
  49 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  50 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  51 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  52
  53 #define platform_is_pseries()   (_machine == PLATFORM_PSERIES || \
  54                                  _machine == PLATFORM_PSERIES_LPAR)
  55 #define platform_is_lpar()      (!!(_machine & PLATFORM_LPAR))
  56
  57 #if defined(CONFIG_PPC_MULTIPLATFORM)
  58 extern int _machine;
  59
  60 #ifdef CONFIG_PPC32
  61
  62 /* what kind of prep workstation we are */
  63 extern int _prep_type;
  64 extern int _chrp_type;
  65
  66 /*
  67  * This is used to identify the board type from a given PReP board
  68  * vendor. Board revision is also made available. This will be moved
  69  * elsewhere soon
  70  */
  71 extern unsigned char ucBoardRev;
  72 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  73
  74 #endif /* CONFIG_PPC32 */
  75
  76 #elif defined(CONFIG_PPC_ISERIES)
  77 /*
  78  * iSeries is soon to become MULTIPLATFORM hopefully ...
  79  */
  80 #define _machine PLATFORM_ISERIES_LPAR
  81 #else
  82 #define _machine 0
  83 #endif /* CONFIG_PPC_MULTIPLATFORM */
  84
  85 /*
  86  * Default implementation of macro that returns current
  87  * instruction pointer ("program counter").
  88  */
  89 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  90
  91 /* Macros for adjusting thread priority (hardware multi-threading) */
  92 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  93 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  94 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  95 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  96 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  97 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  98
  99 #ifdef __KERNEL__
 100
 101 extern int have_of;
 102
 103 struct task_struct;
 104 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
 105 void release_thread(struct task_struct *);
 106
 107 /* Prepare to copy thread state - unlazy all lazy status */
 108 extern void prepare_to_copy(struct task_struct *tsk);
 109
 110 /* Create a new kernel thread. */
 111 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 112
 113 /* Lazy FPU handling on uni-processor */
 114 extern struct task_struct *last_task_used_math;
 115 extern struct task_struct *last_task_used_altivec;
 116 extern struct task_struct *last_task_used_spe;
 117
 118 #ifdef CONFIG_PPC32
 119 #define TASK_SIZE       (CONFIG_TASK_SIZE)
 120
 121 /* This decides where the kernel will search for a free chunk of vm
 122  * space during mmap's.
 123  */
 124 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 125 #endif
 126
 127 #ifdef CONFIG_PPC64
 128 /* 64-bit user address space is 44-bits (16TB user VM) */
 129 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 130
 131 /*
 132  * 32-bit user address space is 4GB - 1 page
 133  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 134  */
 135 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 136
 137 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
 138                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 139
 140 /* This decides where the kernel will search for a free chunk of vm
 141  * space during mmap's.
 142  */
 143 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 144 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 145
 146 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 147                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 148 #endif
 149
 150 typedef struct {
 151         unsigned long seg;
 152 } mm_segment_t;
 153
 154 struct thread_struct {
 155         unsigned long   ksp;            /* Kernel stack pointer */
 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         signed long     last_syscall;
 164 #endif
 165 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 166         unsigned long   dbcr0;          /* debug control register values */
 167         unsigned long   dbcr1;
 168 #endif
 169         double          fpr[32];        /* Complete floating point set */
 170         struct {                        /* fpr ... fpscr must be contiguous */
 171
 172                 unsigned int pad;
 173                 unsigned int val;       /* Floating point status */
 174         } fpscr;
 175         int             fpexc_mode;     /* floating-point exception mode */
 176 #ifdef CONFIG_PPC64
 177         unsigned long   start_tb;       /* Start purr when proc switched in */
 178         unsigned long   accum_tb;       /* Total accumilated purr for process */
 179 #endif
 180         unsigned long   vdso_base;      /* base of the vDSO library */
 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_SPE
 191         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 192         u64             acc;            /* Accumulator */
 193         unsigned long   spefscr;        /* SPE & eFP status */
 194         int             used_spe;       /* set if process has used spe */
 195 #endif /* CONFIG_SPE */
 196 };
 197
 198 #define ARCH_MIN_TASKALIGN 16
 199
 200 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 201
 202
 203 #ifdef CONFIG_PPC32
 204 #define INIT_THREAD { \
 205         .ksp = INIT_SP, \
 206         .fs = KERNEL_DS, \
 207         .pgdir = swapper_pg_dir, \
 208         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 209 }
 210 #else
 211 #define INIT_THREAD  { \
 212         .ksp = INIT_SP, \
 213         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 214         .fs = KERNEL_DS, \
 215         .fpr = {0}, \
 216         .fpscr = { .val = 0, }, \
 217         .fpexc_mode = MSR_FE0|MSR_FE1, \
 218 }
 219 #endif
 220
 221 /*
 222  * Return saved PC of a blocked thread. For now, this is the "user" PC
 223  */
 224 #define thread_saved_pc(tsk)    \
 225         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 226
 227 unsigned long get_wchan(struct task_struct *p);
 228
 229 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 230 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 231
 232 /* Get/set floating-point exception mode */
 233 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 234 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 235
 236 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 237 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 238
 239 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 240 {
 241         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 242 }
 243
 244 static inline unsigned long __pack_fe01(unsigned int fpmode)
 245 {
 246         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 247 }
 248
 249 #ifdef CONFIG_PPC64
 250 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 251 #else
 252 #define cpu_relax()     barrier()
 253 #endif
 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 */