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 const char *get_cpu_subtype(void);
  31
  32 /*
  33  *  CPU type and hardware bug flags. Kept separately for each CPU.
  34  *
  35  *  Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
  36  *  in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
  37  *  for parsing the subtype in get_cpu_subtype().
  38  */
  39 enum cpu_type {
  40         /* SH-2 types */
  41         CPU_SH7604, CPU_SH7619,
  42
  43         /* SH-2A types */
  44         CPU_SH7206,
  45
  46         /* SH-3 types */
  47         CPU_SH7705, CPU_SH7706, CPU_SH7707,
  48         CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
  49         CPU_SH7709, CPU_SH7709A, CPU_SH7710,
  50         CPU_SH7729, CPU_SH7300,
  51
  52         /* SH-4 types */
  53         CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
  54         CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
  55
  56         /* SH-4A types */
  57         CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785,
  58
  59         /* SH4AL-DSP types */
  60         CPU_SH73180, CPU_SH7343, CPU_SH7722,
  61
  62         /* Unknown subtype */
  63         CPU_SH_NONE
  64 };
  65
  66 struct sh_cpuinfo {
  67         unsigned int type;
  68         unsigned long loops_per_jiffy;
  69
  70         struct cache_info icache;       /* Primary I-cache */
  71         struct cache_info dcache;       /* Primary D-cache */
  72         struct cache_info scache;       /* Secondary cache */
  73
  74         unsigned long flags;
  75 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
  76
  77 extern struct sh_cpuinfo boot_cpu_data;
  78
  79 #ifdef CONFIG_SMP
  80 extern struct sh_cpuinfo cpu_data[];
  81 #define current_cpu_data cpu_data[smp_processor_id()]
  82 #else
  83 #define cpu_data (&boot_cpu_data)
  84 #define current_cpu_data boot_cpu_data
  85 #endif
  86
  87 /*
  88  * User space process size: 2GB.
  89  *
  90  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  91  */
  92 #define TASK_SIZE       0x7c000000UL
  93
  94 /* This decides where the kernel will search for a free chunk of vm
  95  * space during mmap's.
  96  */
  97 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  98
  99 /*
 100  * Bit of SR register
 101  *
 102  * FD-bit:
 103  *     When it's set, it means the processor doesn't have right to use FPU,
 104  *     and it results exception when the floating operation is executed.
 105  *
 106  * IMASK-bit:
 107  *     Interrupt level mask
 108  */
 109 #define SR_FD           0x00008000
 110 #define SR_DSP          0x00001000
 111 #define SR_IMASK        0x000000f0
 112
 113 /*
 114  * FPU structure and data
 115  */
 116
 117 struct sh_fpu_hard_struct {
 118         unsigned long fp_regs[16];
 119         unsigned long xfp_regs[16];
 120         unsigned long fpscr;
 121         unsigned long fpul;
 122
 123         long status; /* software status information */
 124 };
 125
 126 /* Dummy fpu emulator  */
 127 struct sh_fpu_soft_struct {
 128         unsigned long fp_regs[16];
 129         unsigned long xfp_regs[16];
 130         unsigned long fpscr;
 131         unsigned long fpul;
 132
 133         unsigned char lookahead;
 134         unsigned long entry_pc;
 135 };
 136
 137 union sh_fpu_union {
 138         struct sh_fpu_hard_struct hard;
 139         struct sh_fpu_soft_struct soft;
 140 };
 141
 142 struct thread_struct {
 143         /* Saved registers when thread is descheduled */
 144         unsigned long sp;
 145         unsigned long pc;
 146
 147         /* Hardware debugging registers */
 148         unsigned long ubc_pc;
 149
 150         /* floating point info */
 151         union sh_fpu_union fpu;
 152 };
 153
 154 typedef struct {
 155         unsigned long seg;
 156 } mm_segment_t;
 157
 158 /* Count of active tasks with UBC settings */
 159 extern int ubc_usercnt;
 160
 161 #define INIT_THREAD  {                                          \
 162         .sp = sizeof(init_stack) + (long) &init_stack,          \
 163 }
 164
 165 /*
 166  * Do necessary setup to start up a newly executed thread.
 167  */
 168 #define start_thread(regs, new_pc, new_sp)       \
 169         set_fs(USER_DS);                         \
 170         regs->pr = 0;                            \
 171         regs->sr = SR_FD;       /* User mode. */ \
 172         regs->pc = new_pc;                       \
 173         regs->regs[15] = new_sp
 174
 175 /* Forward declaration, a strange C thing */
 176 struct task_struct;
 177 struct mm_struct;
 178
 179 /* Free all resources held by a thread. */
 180 extern void release_thread(struct task_struct *);
 181
 182 /* Prepare to copy thread state - unlazy all lazy status */
 183 #define prepare_to_copy(tsk)    do { } while (0)
 184
 185 /*
 186  * create a kernel thread without removing it from tasklists
 187  */
 188 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 189
 190 /* Copy and release all segment info associated with a VM */
 191 #define copy_segments(p, mm)    do { } while(0)
 192 #define release_segments(mm)    do { } while(0)
 193
 194 /*
 195  * FPU lazy state save handling.
 196  */
 197
 198 static __inline__ void disable_fpu(void)
 199 {
 200         unsigned long __dummy;
 201
 202         /* Set FD flag in SR */
 203         __asm__ __volatile__("stc       sr, %0\n\t"
 204                              "or        %1, %0\n\t"
 205                              "ldc       %0, sr"
 206                              : "=&r" (__dummy)
 207                              : "r" (SR_FD));
 208 }
 209
 210 static __inline__ void enable_fpu(void)
 211 {
 212         unsigned long __dummy;
 213
 214         /* Clear out FD flag in SR */
 215         __asm__ __volatile__("stc       sr, %0\n\t"
 216                              "and       %1, %0\n\t"
 217                              "ldc       %0, sr"
 218                              : "=&r" (__dummy)
 219                              : "r" (~SR_FD));
 220 }
 221
 222 static __inline__ void release_fpu(struct pt_regs *regs)
 223 {
 224         regs->sr |= SR_FD;
 225 }
 226
 227 static __inline__ void grab_fpu(struct pt_regs *regs)
 228 {
 229         regs->sr &= ~SR_FD;
 230 }
 231
 232 #ifdef CONFIG_CPU_SH4
 233 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
 234 #else
 235 #define save_fpu(tsk)   do { } while (0)
 236 #endif
 237
 238 #define unlazy_fpu(tsk, regs) do {                      \
 239         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {   \
 240                 save_fpu(tsk, regs);                    \
 241         }                                               \
 242 } while (0)
 243
 244 #define clear_fpu(tsk, regs) do {                               \
 245         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {           \
 246                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);        \
 247                 release_fpu(regs);                              \
 248         }                                                       \
 249 } while (0)
 250
 251 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 252 #define FPSCR_INIT  0x00080000
 253
 254 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 255 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 256
 257 /*
 258  * Return saved PC of a blocked thread.
 259  */
 260 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 261
 262 void show_trace(struct task_struct *tsk, unsigned long *sp,
 263                 struct pt_regs *regs);
 264 extern unsigned long get_wchan(struct task_struct *p);
 265
 266 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 267 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 268
 269 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 270 #define cpu_relax()     barrier()
 271
 272 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 273     defined(CONFIG_CPU_SH4)
 274 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 275 #define ARCH_HAS_PREFETCH
 276 #define ARCH_HAS_PREFETCHW
 277 static inline void prefetch(void *x)
 278 {
 279         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 280 }
 281
 282 #define prefetchw(x)    prefetch(x)
 283 #endif
 284
 285 #ifdef CONFIG_VSYSCALL
 286 extern int vsyscall_init(void);
 287 #else
 288 #define vsyscall_init() do { } while (0)
 289 #endif
 290
 291 #endif /* __KERNEL__ */
 292 #endif /* __ASM_SH_PROCESSOR_H */