include/asm-sh/processor.h

   1 /*
   2  * include/asm-sh/processor.h
   3  *
   4  * Copyright (C) 1999, 2000  Niibe Yutaka
   5  * Copyright (C) 2002, 2003  Paul Mundt
   6  */
   7
   8 #ifndef __ASM_SH_PROCESSOR_H
   9 #define __ASM_SH_PROCESSOR_H
  10 #ifdef __KERNEL__
  11
  12 #include <linux/compiler.h>
  13 #include <asm/page.h>
  14 #include <asm/types.h>
  15 #include <asm/cache.h>
  16 #include <asm/ptrace.h>
  17 #include <asm/cpu-features.h>
  18
  19 /*
  20  * Default implementation of macro that returns current
  21  * instruction pointer ("program counter").
  22  */
  23 #define current_text_addr() ({ void *pc; __asm__("mova  1f, %0\n1:":"=z" (pc)); pc; })
  24
  25 /* Core Processor Version Register */
  26 #define CCN_PVR         0xff000030
  27 #define CCN_CVR         0xff000040
  28 #define CCN_PRR         0xff000044
  29
  30 /*
  31  *  CPU type and hardware bug flags. Kept separately for each CPU.
  32  *
  33  *  Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
  34  *  in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
  35  *  for parsing the subtype in get_cpu_subtype().
  36  */
  37 enum cpu_type {
  38         /* SH-2 types */
  39         CPU_SH7619,
  40
  41         /* SH-2A types */
  42         CPU_SH7206,
  43
  44         /* SH-3 types */
  45         CPU_SH7705, CPU_SH7706, CPU_SH7707,
  46         CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
  47         CPU_SH7709, CPU_SH7709A, CPU_SH7710, CPU_SH7712,
  48         CPU_SH7720, CPU_SH7729,
  49
  50         /* SH-4 types */
  51         CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
  52         CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
  53
  54         /* SH-4A types */
  55         CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, CPU_SHX3,
  56
  57         /* SH4AL-DSP types */
  58         CPU_SH7343, CPU_SH7722,
  59
  60         /* Unknown subtype */
  61         CPU_SH_NONE
  62 };
  63
  64 struct sh_cpuinfo {
  65         unsigned int type;
  66         unsigned long loops_per_jiffy;
  67         unsigned long asid_cache;
  68
  69         struct cache_info icache;       /* Primary I-cache */
  70         struct cache_info dcache;       /* Primary D-cache */
  71         struct cache_info scache;       /* Secondary cache */
  72
  73         unsigned long flags;
  74 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
  75
  76 extern struct sh_cpuinfo cpu_data[];
  77 #define boot_cpu_data cpu_data[0]
  78 #define current_cpu_data cpu_data[smp_processor_id()]
  79 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
  80
  81 /*
  82  * User space process size: 2GB.
  83  *
  84  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  85  */
  86 #define TASK_SIZE       0x7c000000UL
  87
  88 /* This decides where the kernel will search for a free chunk of vm
  89  * space during mmap's.
  90  */
  91 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  92
  93 /*
  94  * Bit of SR register
  95  *
  96  * FD-bit:
  97  *     When it's set, it means the processor doesn't have right to use FPU,
  98  *     and it results exception when the floating operation is executed.
  99  *
 100  * IMASK-bit:
 101  *     Interrupt level mask
 102  */
 103 #define SR_FD           0x00008000
 104 #define SR_DSP          0x00001000
 105 #define SR_IMASK        0x000000f0
 106
 107 /*
 108  * FPU structure and data
 109  */
 110
 111 struct sh_fpu_hard_struct {
 112         unsigned long fp_regs[16];
 113         unsigned long xfp_regs[16];
 114         unsigned long fpscr;
 115         unsigned long fpul;
 116
 117         long status; /* software status information */
 118 };
 119
 120 /* Dummy fpu emulator  */
 121 struct sh_fpu_soft_struct {
 122         unsigned long fp_regs[16];
 123         unsigned long xfp_regs[16];
 124         unsigned long fpscr;
 125         unsigned long fpul;
 126
 127         unsigned char lookahead;
 128         unsigned long entry_pc;
 129 };
 130
 131 union sh_fpu_union {
 132         struct sh_fpu_hard_struct hard;
 133         struct sh_fpu_soft_struct soft;
 134 };
 135
 136 struct thread_struct {
 137         /* Saved registers when thread is descheduled */
 138         unsigned long sp;
 139         unsigned long pc;
 140
 141         /* Hardware debugging registers */
 142         unsigned long ubc_pc;
 143
 144         /* floating point info */
 145         union sh_fpu_union fpu;
 146 };
 147
 148 typedef struct {
 149         unsigned long seg;
 150 } mm_segment_t;
 151
 152 /* Count of active tasks with UBC settings */
 153 extern int ubc_usercnt;
 154
 155 #define INIT_THREAD  {                                          \
 156         .sp = sizeof(init_stack) + (long) &init_stack,          \
 157 }
 158
 159 /*
 160  * Do necessary setup to start up a newly executed thread.
 161  */
 162 #define start_thread(regs, new_pc, new_sp)       \
 163         set_fs(USER_DS);                         \
 164         regs->pr = 0;                            \
 165         regs->sr = SR_FD;       /* User mode. */ \
 166         regs->pc = new_pc;                       \
 167         regs->regs[15] = new_sp
 168
 169 /* Forward declaration, a strange C thing */
 170 struct task_struct;
 171 struct mm_struct;
 172
 173 /* Free all resources held by a thread. */
 174 extern void release_thread(struct task_struct *);
 175
 176 /* Prepare to copy thread state - unlazy all lazy status */
 177 #define prepare_to_copy(tsk)    do { } while (0)
 178
 179 /*
 180  * create a kernel thread without removing it from tasklists
 181  */
 182 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 183
 184 /* Copy and release all segment info associated with a VM */
 185 #define copy_segments(p, mm)    do { } while(0)
 186 #define release_segments(mm)    do { } while(0)
 187
 188 /*
 189  * FPU lazy state save handling.
 190  */
 191
 192 static __inline__ void disable_fpu(void)
 193 {
 194         unsigned long __dummy;
 195
 196         /* Set FD flag in SR */
 197         __asm__ __volatile__("stc       sr, %0\n\t"
 198                              "or        %1, %0\n\t"
 199                              "ldc       %0, sr"
 200                              : "=&r" (__dummy)
 201                              : "r" (SR_FD));
 202 }
 203
 204 static __inline__ void enable_fpu(void)
 205 {
 206         unsigned long __dummy;
 207
 208         /* Clear out FD flag in SR */
 209         __asm__ __volatile__("stc       sr, %0\n\t"
 210                              "and       %1, %0\n\t"
 211                              "ldc       %0, sr"
 212                              : "=&r" (__dummy)
 213                              : "r" (~SR_FD));
 214 }
 215
 216 static __inline__ void release_fpu(struct pt_regs *regs)
 217 {
 218         regs->sr |= SR_FD;
 219 }
 220
 221 static __inline__ void grab_fpu(struct pt_regs *regs)
 222 {
 223         regs->sr &= ~SR_FD;
 224 }
 225
 226 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
 227
 228 #define unlazy_fpu(tsk, regs) do {                      \
 229         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {   \
 230                 save_fpu(tsk, regs);                    \
 231         }                                               \
 232 } while (0)
 233
 234 #define clear_fpu(tsk, regs) do {                               \
 235         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {           \
 236                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);        \
 237                 release_fpu(regs);                              \
 238         }                                                       \
 239 } while (0)
 240
 241 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 242 #define FPSCR_INIT  0x00080000
 243
 244 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 245 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 246
 247 /*
 248  * Return saved PC of a blocked thread.
 249  */
 250 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 251
 252 void show_trace(struct task_struct *tsk, unsigned long *sp,
 253                 struct pt_regs *regs);
 254 extern unsigned long get_wchan(struct task_struct *p);
 255
 256 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 257 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 258
 259 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 260 #define cpu_relax()     barrier()
 261
 262 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 263     defined(CONFIG_CPU_SH4)
 264 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 265 #define ARCH_HAS_PREFETCH
 266 #define ARCH_HAS_PREFETCHW
 267 static inline void prefetch(void *x)
 268 {
 269         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 270 }
 271
 272 #define prefetchw(x)    prefetch(x)
 273 #endif
 274
 275 #ifdef CONFIG_VSYSCALL
 276 extern int vsyscall_init(void);
 277 #else
 278 #define vsyscall_init() do { } while (0)
 279 #endif
 280
 281 /* arch/sh/kernel/setup.c */
 282 const char *get_cpu_subtype(struct sh_cpuinfo *c);
 283
 284 #endif /* __KERNEL__ */
 285 #endif /* __ASM_SH_PROCESSOR_H */