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 #ifdef CONFIG_PPC64
  21 #include <asm/systemcfg.h>
  22 #endif
  23
  24 #ifdef CONFIG_PPC32
  25 /* 32-bit platform types */
  26 /* We only need to define a new _MACH_xxx for machines which are part of
  27  * a configuration which supports more than one type of different machine.
  28  * This is currently limited to CONFIG_PPC_MULTIPLATFORM and CHRP/PReP/PMac.
  29  * -- Tom
  30  */
  31 #define _MACH_prep      0x00000001
  32 #define _MACH_Pmac      0x00000002      /* pmac or pmac clone (non-chrp) */
  33 #define _MACH_chrp      0x00000004      /* chrp machine */
  34
  35 /* see residual.h for these */
  36 #define _PREP_Motorola  0x01    /* motorola prep */
  37 #define _PREP_Firm      0x02    /* firmworks prep */
  38 #define _PREP_IBM       0x00    /* ibm prep */
  39 #define _PREP_Bull      0x03    /* bull prep */
  40
  41 /* these are arbitrary */
  42 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  43 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  44 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  45
  46 #ifdef CONFIG_PPC_MULTIPLATFORM
  47 extern int _machine;
  48
  49 /* what kind of prep workstation we are */
  50 extern int _prep_type;
  51 extern int _chrp_type;
  52
  53 /*
  54  * This is used to identify the board type from a given PReP board
  55  * vendor. Board revision is also made available.
  56  */
  57 extern unsigned char ucSystemType;
  58 extern unsigned char ucBoardRev;
  59 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  60 #else
  61 #define _machine 0
  62 #endif /* CONFIG_PPC_MULTIPLATFORM */
  63 #endif /* CONFIG_PPC32 */
  64
  65 #ifdef CONFIG_PPC64
  66 /* Platforms supported by PPC64 */
  67 #define PLATFORM_PSERIES      0x0100
  68 #define PLATFORM_PSERIES_LPAR 0x0101
  69 #define PLATFORM_ISERIES_LPAR 0x0201
  70 #define PLATFORM_LPAR         0x0001
  71 #define PLATFORM_POWERMAC     0x0400
  72 #define PLATFORM_MAPLE        0x0500
  73 #define PLATFORM_BPA          0x1000
  74
  75 /* Compatibility with drivers coming from PPC32 world */
  76 #define _machine        (systemcfg->platform)
  77 #define _MACH_Pmac      PLATFORM_POWERMAC
  78 #endif
  79
  80 /*
  81  * Default implementation of macro that returns current
  82  * instruction pointer ("program counter").
  83  */
  84 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  85
  86 /* Macros for adjusting thread priority (hardware multi-threading) */
  87 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  88 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  89 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  90 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  91 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  92 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  93
  94 #ifdef __KERNEL__
  95
  96 extern int have_of;
  97
  98 struct task_struct;
  99 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
 100 void release_thread(struct task_struct *);
 101
 102 /* Prepare to copy thread state - unlazy all lazy status */
 103 extern void prepare_to_copy(struct task_struct *tsk);
 104
 105 /* Create a new kernel thread. */
 106 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 107
 108 /* Lazy FPU handling on uni-processor */
 109 extern struct task_struct *last_task_used_math;
 110 extern struct task_struct *last_task_used_altivec;
 111 extern struct task_struct *last_task_used_spe;
 112
 113 #ifdef CONFIG_PPC32
 114 #define TASK_SIZE       (CONFIG_TASK_SIZE)
 115
 116 /* This decides where the kernel will search for a free chunk of vm
 117  * space during mmap's.
 118  */
 119 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 120 #endif
 121
 122 #ifdef CONFIG_PPC64
 123 /* 64-bit user address space is 44-bits (16TB user VM) */
 124 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 125
 126 /*
 127  * 32-bit user address space is 4GB - 1 page
 128  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 129  */
 130 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 131
 132 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
 133                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 134
 135 /* This decides where the kernel will search for a free chunk of vm
 136  * space during mmap's.
 137  */
 138 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 139 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 140
 141 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 142                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 143 #endif
 144
 145 typedef struct {
 146         unsigned long seg;
 147 } mm_segment_t;
 148
 149 struct thread_struct {
 150         unsigned long   ksp;            /* Kernel stack pointer */
 151 #ifdef CONFIG_PPC64
 152         unsigned long   ksp_vsid;
 153 #endif
 154         struct pt_regs  *regs;          /* Pointer to saved register state */
 155         mm_segment_t    fs;             /* for get_fs() validation */
 156 #ifdef CONFIG_PPC32
 157         void            *pgdir;         /* root of page-table tree */
 158         signed long     last_syscall;
 159 #endif
 160 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 161         unsigned long   dbcr0;          /* debug control register values */
 162         unsigned long   dbcr1;
 163 #endif
 164         double          fpr[32];        /* Complete floating point set */
 165 #ifdef CONFIG_PPC32
 166         unsigned long   fpscr_pad;      /* fpr ... fpscr must be contiguous */
 167 #endif
 168         unsigned long   fpscr;          /* Floating point status */
 169         int             fpexc_mode;     /* floating-point exception mode */
 170 #ifdef CONFIG_PPC64
 171         unsigned long   start_tb;       /* Start purr when proc switched in */
 172         unsigned long   accum_tb;       /* Total accumilated purr for process */
 173         unsigned long   vdso_base;      /* base of the vDSO library */
 174 #endif
 175         unsigned long   dabr;           /* Data address breakpoint register */
 176 #ifdef CONFIG_ALTIVEC
 177         /* Complete AltiVec register set */
 178         vector128       vr[32] __attribute((aligned(16)));
 179         /* AltiVec status */
 180         vector128       vscr __attribute((aligned(16)));
 181         unsigned long   vrsave;
 182         int             used_vr;        /* set if process has used altivec */
 183 #endif /* CONFIG_ALTIVEC */
 184 #ifdef CONFIG_SPE
 185         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 186         u64             acc;            /* Accumulator */
 187         unsigned long   spefscr;        /* SPE & eFP status */
 188         int             used_spe;       /* set if process has used spe */
 189 #endif /* CONFIG_SPE */
 190 };
 191
 192 #define ARCH_MIN_TASKALIGN 16
 193
 194 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 195
 196
 197 #ifdef CONFIG_PPC32
 198 #define INIT_THREAD { \
 199         .ksp = INIT_SP, \
 200         .fs = KERNEL_DS, \
 201         .pgdir = swapper_pg_dir, \
 202         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 203 }
 204 #else
 205 #define INIT_THREAD  { \
 206         .ksp = INIT_SP, \
 207         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 208         .fs = KERNEL_DS, \
 209         .fpr = {0}, \
 210         .fpscr = 0, \
 211         .fpexc_mode = MSR_FE0|MSR_FE1, \
 212 }
 213 #endif
 214
 215 /*
 216  * Return saved PC of a blocked thread. For now, this is the "user" PC
 217  */
 218 #define thread_saved_pc(tsk)    \
 219         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 220
 221 unsigned long get_wchan(struct task_struct *p);
 222
 223 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 224 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 225
 226 /* Get/set floating-point exception mode */
 227 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 228 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 229
 230 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 231 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 232
 233 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 234 {
 235         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 236 }
 237
 238 static inline unsigned long __pack_fe01(unsigned int fpmode)
 239 {
 240         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 241 }
 242
 243 #ifdef CONFIG_PPC64
 244 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 245 #else
 246 #define cpu_relax()     barrier()
 247 #endif
 248
 249 /*
 250  * Prefetch macros.
 251  */
 252 #define ARCH_HAS_PREFETCH
 253 #define ARCH_HAS_PREFETCHW
 254 #define ARCH_HAS_SPINLOCK_PREFETCH
 255
 256 static inline void prefetch(const void *x)
 257 {
 258         if (unlikely(!x))
 259                 return;
 260
 261         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 262 }
 263
 264 static inline void prefetchw(const void *x)
 265 {
 266         if (unlikely(!x))
 267                 return;
 268
 269         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 270 }
 271
 272 #define spin_lock_prefetch(x)   prefetchw(x)
 273
 274 #ifdef CONFIG_PPC64
 275 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 276 #endif
 277
 278 #endif /* __KERNEL__ */
 279 #endif /* __ASSEMBLY__ */
 280 #endif /* _ASM_POWERPC_PROCESSOR_H */