include/asm-sh/system.h

   1 #ifndef __ASM_SH_SYSTEM_H
   2 #define __ASM_SH_SYSTEM_H
   3
   4 /*
   5  * Copyright (C) 1999, 2000  Niibe Yutaka  &  Kaz Kojima
   6  * Copyright (C) 2002 Paul Mundt
   7  */
   8
   9 #include <linux/irqflags.h>
  10 #include <linux/compiler.h>
  11 #include <linux/linkage.h>
  12 #include <asm/types.h>
  13 #include <asm/ptrace.h>
  14
  15 #define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
  16
  17 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
  18 #define __icbi()                        \
  19 {                                       \
  20         unsigned long __addr;           \
  21         __addr = 0xa8000000;            \
  22         __asm__ __volatile__(           \
  23                 "icbi   %0\n\t"         \
  24                 : /* no output */       \
  25                 : "m" (__m(__addr)));   \
  26 }
  27 #endif
  28
  29 /*
  30  * A brief note on ctrl_barrier(), the control register write barrier.
  31  *
  32  * Legacy SH cores typically require a sequence of 8 nops after
  33  * modification of a control register in order for the changes to take
  34  * effect. On newer cores (like the sh4a and sh5) this is accomplished
  35  * with icbi.
  36  *
  37  * Also note that on sh4a in the icbi case we can forego a synco for the
  38  * write barrier, as it's not necessary for control registers.
  39  *
  40  * Historically we have only done this type of barrier for the MMUCR, but
  41  * it's also necessary for the CCR, so we make it generic here instead.
  42  */
  43 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
  44 #define mb()            __asm__ __volatile__ ("synco": : :"memory")
  45 #define rmb()           mb()
  46 #define wmb()           __asm__ __volatile__ ("synco": : :"memory")
  47 #define ctrl_barrier()  __icbi()
  48 #define read_barrier_depends()  do { } while(0)
  49 #else
  50 #define mb()            __asm__ __volatile__ ("": : :"memory")
  51 #define rmb()           mb()
  52 #define wmb()           __asm__ __volatile__ ("": : :"memory")
  53 #define ctrl_barrier()  __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
  54 #define read_barrier_depends()  do { } while(0)
  55 #endif
  56
  57 #ifdef CONFIG_SMP
  58 #define smp_mb()        mb()
  59 #define smp_rmb()       rmb()
  60 #define smp_wmb()       wmb()
  61 #define smp_read_barrier_depends()      read_barrier_depends()
  62 #else
  63 #define smp_mb()        barrier()
  64 #define smp_rmb()       barrier()
  65 #define smp_wmb()       barrier()
  66 #define smp_read_barrier_depends()      do { } while(0)
  67 #endif
  68
  69 #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
  70
  71 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
  72 {
  73         unsigned long flags, retval;
  74
  75         local_irq_save(flags);
  76         retval = *m;
  77         *m = val;
  78         local_irq_restore(flags);
  79         return retval;
  80 }
  81
  82 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  83 {
  84         unsigned long flags, retval;
  85
  86         local_irq_save(flags);
  87         retval = *m;
  88         *m = val & 0xff;
  89         local_irq_restore(flags);
  90         return retval;
  91 }
  92
  93 extern void __xchg_called_with_bad_pointer(void);
  94
  95 #define __xchg(ptr, x, size)                            \
  96 ({                                                      \
  97         unsigned long __xchg__res;                      \
  98         volatile void *__xchg_ptr = (ptr);              \
  99         switch (size) {                                 \
 100         case 4:                                         \
 101                 __xchg__res = xchg_u32(__xchg_ptr, x);  \
 102                 break;                                  \
 103         case 1:                                         \
 104                 __xchg__res = xchg_u8(__xchg_ptr, x);   \
 105                 break;                                  \
 106         default:                                        \
 107                 __xchg_called_with_bad_pointer();       \
 108                 __xchg__res = x;                        \
 109                 break;                                  \
 110         }                                               \
 111                                                         \
 112         __xchg__res;                                    \
 113 })
 114
 115 #define xchg(ptr,x)     \
 116         ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
 117
 118 static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
 119         unsigned long new)
 120 {
 121         __u32 retval;
 122         unsigned long flags;
 123
 124         local_irq_save(flags);
 125         retval = *m;
 126         if (retval == old)
 127                 *m = new;
 128         local_irq_restore(flags);       /* implies memory barrier  */
 129         return retval;
 130 }
 131
 132 /* This function doesn't exist, so you'll get a linker error
 133  * if something tries to do an invalid cmpxchg(). */
 134 extern void __cmpxchg_called_with_bad_pointer(void);
 135
 136 #define __HAVE_ARCH_CMPXCHG 1
 137
 138 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 139                 unsigned long new, int size)
 140 {
 141         switch (size) {
 142         case 4:
 143                 return __cmpxchg_u32(ptr, old, new);
 144         }
 145         __cmpxchg_called_with_bad_pointer();
 146         return old;
 147 }
 148
 149 #define cmpxchg(ptr,o,n)                                                 \
 150   ({                                                                     \
 151      __typeof__(*(ptr)) _o_ = (o);                                       \
 152      __typeof__(*(ptr)) _n_ = (n);                                       \
 153      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
 154                                     (unsigned long)_n_, sizeof(*(ptr))); \
 155   })
 156
 157 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
 158
 159 extern void *set_exception_table_vec(unsigned int vec, void *handler);
 160
 161 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
 162 {
 163         return set_exception_table_vec(evt >> 5, handler);
 164 }
 165
 166 /*
 167  * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
 168  */
 169 #ifdef CONFIG_CPU_SH2A
 170 extern unsigned int instruction_size(unsigned int insn);
 171 #elif defined(CONFIG_SUPERH32)
 172 #define instruction_size(insn)  (2)
 173 #else
 174 #define instruction_size(insn)  (4)
 175 #endif
 176
 177 /* XXX
 178  * disable hlt during certain critical i/o operations
 179  */
 180 #define HAVE_DISABLE_HLT
 181 void disable_hlt(void);
 182 void enable_hlt(void);
 183
 184 void default_idle(void);
 185 void per_cpu_trap_init(void);
 186
 187 asmlinkage void break_point_trap(void);
 188
 189 #ifdef CONFIG_SUPERH32
 190 #define BUILD_TRAP_HANDLER(name)                                        \
 191 asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
 192                                     unsigned long r6, unsigned long r7, \
 193                                     struct pt_regs __regs)
 194
 195 #define TRAP_HANDLER_DECL                               \
 196         struct pt_regs *regs = RELOC_HIDE(&__regs, 0);  \
 197         unsigned int vec = regs->tra;                   \
 198         (void)vec;
 199 #else
 200 #define BUILD_TRAP_HANDLER(name)        \
 201 asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
 202 #define TRAP_HANDLER_DECL
 203 #endif
 204
 205 BUILD_TRAP_HANDLER(address_error);
 206 BUILD_TRAP_HANDLER(debug);
 207 BUILD_TRAP_HANDLER(bug);
 208 BUILD_TRAP_HANDLER(fpu_error);
 209 BUILD_TRAP_HANDLER(fpu_state_restore);
 210
 211 #define arch_align_stack(x) (x)
 212
 213 #ifdef CONFIG_SUPERH32
 214 # include "system_32.h"
 215 #else
 216 # include "system_64.h"
 217 #endif
 218
 219 #endif