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
  36 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
  37
  38 extern int _chrp_type;
  39
  40 #ifdef CONFIG_PPC_PREP
  41
  42 /* what kind of prep workstation we are */
  43 extern int _prep_type;
  44
  45 /*
  46  * This is used to identify the board type from a given PReP board
  47  * vendor. Board revision is also made available. This will be moved
  48  * elsewhere soon
  49  */
  50 extern unsigned char ucBoardRev;
  51 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  52
  53 #endif /* CONFIG_PPC_PREP */
  54
  55 #ifndef CONFIG_PPC_MULTIPLATFORM
  56 #define _machine 0
  57 #endif /* CONFIG_PPC_MULTIPLATFORM */
  58
  59 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  60
  61 /*
  62  * Default implementation of macro that returns current
  63  * instruction pointer ("program counter").
  64  */
  65 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  66
  67 /* Macros for adjusting thread priority (hardware multi-threading) */
  68 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  69 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  70 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  71 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  72 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  73 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  74
  75 #ifdef __KERNEL__
  76
  77 extern int have_of;
  78
  79 struct task_struct;
  80 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  81 void release_thread(struct task_struct *);
  82
  83 /* Prepare to copy thread state - unlazy all lazy status */
  84 extern void prepare_to_copy(struct task_struct *tsk);
  85
  86 /* Create a new kernel thread. */
  87 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  88
  89 /* Lazy FPU handling on uni-processor */
  90 extern struct task_struct *last_task_used_math;
  91 extern struct task_struct *last_task_used_altivec;
  92 extern struct task_struct *last_task_used_spe;
  93
  94 #ifdef CONFIG_PPC32
  95 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  96
  97 /* This decides where the kernel will search for a free chunk of vm
  98  * space during mmap's.
  99  */
 100 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 101 #endif
 102
 103 #ifdef CONFIG_PPC64
 104 /* 64-bit user address space is 44-bits (16TB user VM) */
 105 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 106
 107 /*
 108  * 32-bit user address space is 4GB - 1 page
 109  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 110  */
 111 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 112
 113 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
 114                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 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_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 120 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 121
 122 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
 123                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 124 #endif
 125
 126 typedef struct {
 127         unsigned long seg;
 128 } mm_segment_t;
 129
 130 struct thread_struct {
 131         unsigned long   ksp;            /* Kernel stack pointer */
 132 #ifdef CONFIG_PPC64
 133         unsigned long   ksp_vsid;
 134 #endif
 135         struct pt_regs  *regs;          /* Pointer to saved register state */
 136         mm_segment_t    fs;             /* for get_fs() validation */
 137 #ifdef CONFIG_PPC32
 138         void            *pgdir;         /* root of page-table tree */
 139         signed long     last_syscall;
 140 #endif
 141 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 142         unsigned long   dbcr0;          /* debug control register values */
 143         unsigned long   dbcr1;
 144 #endif
 145         double          fpr[32];        /* Complete floating point set */
 146         struct {                        /* fpr ... fpscr must be contiguous */
 147
 148                 unsigned int pad;
 149                 unsigned int val;       /* Floating point status */
 150         } fpscr;
 151         int             fpexc_mode;     /* floating-point exception mode */
 152 #ifdef CONFIG_PPC64
 153         unsigned long   start_tb;       /* Start purr when proc switched in */
 154         unsigned long   accum_tb;       /* Total accumilated purr for process */
 155 #endif
 156         unsigned long   vdso_base;      /* base of the vDSO library */
 157         unsigned long   dabr;           /* Data address breakpoint register */
 158 #ifdef CONFIG_ALTIVEC
 159         /* Complete AltiVec register set */
 160         vector128       vr[32] __attribute((aligned(16)));
 161         /* AltiVec status */
 162         vector128       vscr __attribute((aligned(16)));
 163         unsigned long   vrsave;
 164         int             used_vr;        /* set if process has used altivec */
 165 #endif /* CONFIG_ALTIVEC */
 166 #ifdef CONFIG_SPE
 167         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 168         u64             acc;            /* Accumulator */
 169         unsigned long   spefscr;        /* SPE & eFP status */
 170         int             used_spe;       /* set if process has used spe */
 171 #endif /* CONFIG_SPE */
 172 };
 173
 174 #define ARCH_MIN_TASKALIGN 16
 175
 176 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 177
 178
 179 #ifdef CONFIG_PPC32
 180 #define INIT_THREAD { \
 181         .ksp = INIT_SP, \
 182         .fs = KERNEL_DS, \
 183         .pgdir = swapper_pg_dir, \
 184         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 185 }
 186 #else
 187 #define INIT_THREAD  { \
 188         .ksp = INIT_SP, \
 189         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 190         .fs = KERNEL_DS, \
 191         .fpr = {0}, \
 192         .fpscr = { .val = 0, }, \
 193         .fpexc_mode = MSR_FE0|MSR_FE1, \
 194 }
 195 #endif
 196
 197 /*
 198  * Return saved PC of a blocked thread. For now, this is the "user" PC
 199  */
 200 #define thread_saved_pc(tsk)    \
 201         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 202
 203 unsigned long get_wchan(struct task_struct *p);
 204
 205 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 206 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 207
 208 /* Get/set floating-point exception mode */
 209 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 210 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 211
 212 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 213 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 214
 215 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 216 {
 217         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 218 }
 219
 220 static inline unsigned long __pack_fe01(unsigned int fpmode)
 221 {
 222         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 223 }
 224
 225 #ifdef CONFIG_PPC64
 226 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 227 #else
 228 #define cpu_relax()     barrier()
 229 #endif
 230
 231 /* Check that a certain kernel stack pointer is valid in task_struct p */
 232 int validate_sp(unsigned long sp, struct task_struct *p,
 233                        unsigned long nbytes);
 234
 235 /*
 236  * Prefetch macros.
 237  */
 238 #define ARCH_HAS_PREFETCH
 239 #define ARCH_HAS_PREFETCHW
 240 #define ARCH_HAS_SPINLOCK_PREFETCH
 241
 242 static inline void prefetch(const void *x)
 243 {
 244         if (unlikely(!x))
 245                 return;
 246
 247         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 248 }
 249
 250 static inline void prefetchw(const void *x)
 251 {
 252         if (unlikely(!x))
 253                 return;
 254
 255         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 256 }
 257
 258 #define spin_lock_prefetch(x)   prefetchw(x)
 259
 260 #ifdef CONFIG_PPC64
 261 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 262 #endif
 263
 264 #endif /* __KERNEL__ */
 265 #endif /* __ASSEMBLY__ */
 266 #endif /* _ASM_POWERPC_PROCESSOR_H */