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   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 Waldorf GMBH
   7  * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
   8  * Copyright (C) 1996 Paul M. Antoine
   9  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  10  */
  11 #ifndef _ASM_PROCESSOR_H
  12 #define _ASM_PROCESSOR_H
  13
  14 #include <linux/cpumask.h>
  15 #include <linux/threads.h>
  16
  17 #include <asm/cachectl.h>
  18 #include <asm/cpu.h>
  19 #include <asm/cpu-info.h>
  20 #include <asm/mipsregs.h>
  21 #include <asm/prefetch.h>
  22 #include <asm/system.h>
  23
  24 /*
  25  * Return current * instruction pointer ("program counter").
  26  */
  27 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  28
  29 /*
  30  * System setup and hardware flags..
  31  */
  32 extern void (*cpu_wait)(void);
  33
  34 extern unsigned int vced_count, vcei_count;
  35
  36 #ifdef CONFIG_32BIT
  37 /*
  38  * User space process size: 2GB. This is hardcoded into a few places,
  39  * so don't change it unless you know what you are doing.
  40  */
  41 #define TASK_SIZE       0x7fff8000UL
  42 #define STACK_TOP       TASK_SIZE
  43
  44 /*
  45  * This decides where the kernel will search for a free chunk of vm
  46  * space during mmap's.
  47  */
  48 #define TASK_UNMAPPED_BASE      ((TASK_SIZE / 3) & ~(PAGE_SIZE))
  49 #endif
  50
  51 #ifdef CONFIG_64BIT
  52 /*
  53  * User space process size: 1TB. This is hardcoded into a few places,
  54  * so don't change it unless you know what you are doing.  TASK_SIZE
  55  * is limited to 1TB by the R4000 architecture; R10000 and better can
  56  * support 16TB; the architectural reserve for future expansion is
  57  * 8192EB ...
  58  */
  59 #define TASK_SIZE32     0x7fff8000UL
  60 #define TASK_SIZE       0x10000000000UL
  61 #define STACK_TOP       \
  62       (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
  63
  64 /*
  65  * This decides where the kernel will search for a free chunk of vm
  66  * space during mmap's.
  67  */
  68 #define TASK_UNMAPPED_BASE                                              \
  69         (test_thread_flag(TIF_32BIT_ADDR) ?                             \
  70                 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
  71 #define TASK_SIZE_OF(tsk)                                               \
  72         (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
  73 #endif
  74
  75 #ifdef __KERNEL__
  76 #define STACK_TOP_MAX   TASK_SIZE
  77 #endif
  78
  79 #define NUM_FPU_REGS    32
  80
  81 typedef __u64 fpureg_t;
  82
  83 /*
  84  * It would be nice to add some more fields for emulator statistics, but there
  85  * are a number of fixed offsets in offset.h and elsewhere that would have to
  86  * be recalculated by hand.  So the additional information will be private to
  87  * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
  88  */
  89
  90 struct mips_fpu_struct {
  91         fpureg_t        fpr[NUM_FPU_REGS];
  92         unsigned int    fcr31;
  93 };
  94
  95 #define NUM_DSP_REGS   6
  96
  97 typedef __u32 dspreg_t;
  98
  99 struct mips_dsp_state {
 100         dspreg_t        dspr[NUM_DSP_REGS];
 101         unsigned int    dspcontrol;
 102 };
 103
 104 #define INIT_CPUMASK { \
 105         {0,} \
 106 }
 107
 108 typedef struct {
 109         unsigned long seg;
 110 } mm_segment_t;
 111
 112 #define ARCH_MIN_TASKALIGN      8
 113
 114 struct mips_abi;
 115
 116 /*
 117  * If you change thread_struct remember to change the #defines below too!
 118  */
 119 struct thread_struct {
 120         /* Saved main processor registers. */
 121         unsigned long reg16;
 122         unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
 123         unsigned long reg29, reg30, reg31;
 124
 125         /* Saved cp0 stuff. */
 126         unsigned long cp0_status;
 127
 128         /* Saved fpu/fpu emulator stuff. */
 129         struct mips_fpu_struct fpu;
 130 #ifdef CONFIG_MIPS_MT_FPAFF
 131         /* Emulated instruction count */
 132         unsigned long emulated_fp;
 133         /* Saved per-thread scheduler affinity mask */
 134         cpumask_t user_cpus_allowed;
 135 #endif /* CONFIG_MIPS_MT_FPAFF */
 136
 137         /* Saved state of the DSP ASE, if available. */
 138         struct mips_dsp_state dsp;
 139
 140         /* Other stuff associated with the thread. */
 141         unsigned long cp0_badvaddr;     /* Last user fault */
 142         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
 143         unsigned long error_code;
 144         unsigned long trap_no;
 145         unsigned long irix_trampoline;  /* Wheee... */
 146         unsigned long irix_oldctx;
 147         struct mips_abi *abi;
 148 };
 149
 150 #ifdef CONFIG_MIPS_MT_FPAFF
 151 #define FPAFF_INIT                                              \
 152         .emulated_fp                    = 0,                    \
 153         .user_cpus_allowed              = INIT_CPUMASK,
 154 #else
 155 #define FPAFF_INIT
 156 #endif /* CONFIG_MIPS_MT_FPAFF */
 157
 158 #define INIT_THREAD  {                                          \
 159         /*                                                      \
 160          * Saved main processor registers                       \
 161          */                                                     \
 162         .reg16                  = 0,                            \
 163         .reg17                  = 0,                            \
 164         .reg18                  = 0,                            \
 165         .reg19                  = 0,                            \
 166         .reg20                  = 0,                            \
 167         .reg21                  = 0,                            \
 168         .reg22                  = 0,                            \
 169         .reg23                  = 0,                            \
 170         .reg29                  = 0,                            \
 171         .reg30                  = 0,                            \
 172         .reg31                  = 0,                            \
 173         /*                                                      \
 174          * Saved cp0 stuff                                      \
 175          */                                                     \
 176         .cp0_status             = 0,                            \
 177         /*                                                      \
 178          * Saved FPU/FPU emulator stuff                         \
 179          */                                                     \
 180         .fpu                    = {                             \
 181                 .fpr            = {0,},                         \
 182                 .fcr31          = 0,                            \
 183         },                                                      \
 184         /*                                                      \
 185          * FPU affinity state (null if not FPAFF)               \
 186          */                                                     \
 187         FPAFF_INIT                                              \
 188         /*                                                      \
 189          * Saved DSP stuff                                      \
 190          */                                                     \
 191         .dsp                    = {                             \
 192                 .dspr           = {0, },                        \
 193                 .dspcontrol     = 0,                            \
 194         },                                                      \
 195         /*                                                      \
 196          * Other stuff associated with the process              \
 197          */                                                     \
 198         .cp0_badvaddr           = 0,                            \
 199         .cp0_baduaddr           = 0,                            \
 200         .error_code             = 0,                            \
 201         .trap_no                = 0,                            \
 202         .irix_trampoline        = 0,                            \
 203         .irix_oldctx            = 0,                            \
 204 }
 205
 206 struct task_struct;
 207
 208 /* Free all resources held by a thread. */
 209 #define release_thread(thread) do { } while(0)
 210
 211 /* Prepare to copy thread state - unlazy all lazy status */
 212 #define prepare_to_copy(tsk)    do { } while (0)
 213
 214 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 215
 216 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 217
 218 /*
 219  * Do necessary setup to start up a newly executed thread.
 220  */
 221 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 222
 223 unsigned long get_wchan(struct task_struct *p);
 224
 225 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
 226 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
 227 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
 228 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
 229 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
 230
 231 #define cpu_relax()     barrier()
 232
 233 /*
 234  * Return_address is a replacement for __builtin_return_address(count)
 235  * which on certain architectures cannot reasonably be implemented in GCC
 236  * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
 237  * Note that __builtin_return_address(x>=1) is forbidden because GCC
 238  * aborts compilation on some CPUs.  It's simply not possible to unwind
 239  * some CPU's stackframes.
 240  *
 241  * __builtin_return_address works only for non-leaf functions.  We avoid the
 242  * overhead of a function call by forcing the compiler to save the return
 243  * address register on the stack.
 244  */
 245 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
 246
 247 #ifdef CONFIG_CPU_HAS_PREFETCH
 248
 249 #define ARCH_HAS_PREFETCH
 250
 251 static inline void prefetch(const void *addr)
 252 {
 253         __asm__ __volatile__(
 254         "       .set    mips4           \n"
 255         "       pref    %0, (%1)        \n"
 256         "       .set    mips0           \n"
 257         :
 258         : "i" (Pref_Load), "r" (addr));
 259 }
 260
 261 #endif
 262
 263 #endif /* _ASM_PROCESSOR_H */