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   1 #ifndef __ASM_SH64_SYSTEM_H
   2 #define __ASM_SH64_SYSTEM_H
   3
   4 /*
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * include/asm-sh64/system.h
  10  *
  11  * Copyright (C) 2000, 2001  Paolo Alberelli
  12  * Copyright (C) 2003  Paul Mundt
  13  * Copyright (C) 2004  Richard Curnow
  14  *
  15  */
  16
  17 #include <asm/registers.h>
  18 #include <asm/processor.h>
  19
  20 /*
  21  *      switch_to() should switch tasks to task nr n, first
  22  */
  23
  24 typedef struct {
  25         unsigned long seg;
  26 } mm_segment_t;
  27
  28 extern struct task_struct *sh64_switch_to(struct task_struct *prev,
  29                                           struct thread_struct *prev_thread,
  30                                           struct task_struct *next,
  31                                           struct thread_struct *next_thread);
  32
  33 #define switch_to(prev,next,last) \
  34         do {\
  35                 if (last_task_used_math != next) {\
  36                         struct pt_regs *regs = next->thread.uregs;\
  37                         if (regs) regs->sr |= SR_FD;\
  38                 }\
  39                 last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
  40         } while(0)
  41
  42 #define nop() __asm__ __volatile__ ("nop")
  43
  44 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
  45
  46 extern void __xchg_called_with_bad_pointer(void);
  47
  48 #define mb()    __asm__ __volatile__ ("synco": : :"memory")
  49 #define rmb()   mb()
  50 #define wmb()   __asm__ __volatile__ ("synco": : :"memory")
  51 #define read_barrier_depends()  do { } while (0)
  52
  53 #ifdef CONFIG_SMP
  54 #define smp_mb()        mb()
  55 #define smp_rmb()       rmb()
  56 #define smp_wmb()       wmb()
  57 #define smp_read_barrier_depends()      read_barrier_depends()
  58 #else
  59 #define smp_mb()        barrier()
  60 #define smp_rmb()       barrier()
  61 #define smp_wmb()       barrier()
  62 #define smp_read_barrier_depends()      do { } while (0)
  63 #endif /* CONFIG_SMP */
  64
  65 #define set_rmb(var, value) do { (void)xchg(&var, value); } while (0)
  66 #define set_mb(var, value) set_rmb(var, value)
  67
  68 /* Interrupt Control */
  69 #ifndef HARD_CLI
  70 #define SR_MASK_L 0x000000f0L
  71 #define SR_MASK_LL 0x00000000000000f0LL
  72 #else
  73 #define SR_MASK_L 0x10000000L
  74 #define SR_MASK_LL 0x0000000010000000LL
  75 #endif
  76
  77 static __inline__ void local_irq_enable(void)
  78 {
  79         /* cli/sti based on SR.BL */
  80         unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
  81
  82         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  83                              "and       %0, %1, %0\n\t"
  84                              "putcon    %0, " __SR "\n\t"
  85                              : "=&r" (__dummy0)
  86                              : "r" (__dummy1));
  87 }
  88
  89 static __inline__ void local_irq_disable(void)
  90 {
  91         /* cli/sti based on SR.BL */
  92         unsigned long long __dummy0, __dummy1=SR_MASK_LL;
  93         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  94                              "or        %0, %1, %0\n\t"
  95                              "putcon    %0, " __SR "\n\t"
  96                              : "=&r" (__dummy0)
  97                              : "r" (__dummy1));
  98 }
  99
 100 #define local_save_flags(x)                                             \
 101 (__extension__ ({       unsigned long long __dummy=SR_MASK_LL;          \
 102         __asm__ __volatile__(                                           \
 103                 "getcon " __SR ", %0\n\t"                               \
 104                 "and    %0, %1, %0"                                     \
 105                 : "=&r" (x)                                             \
 106                 : "r" (__dummy));}))
 107
 108 #define local_irq_save(x)                                               \
 109 (__extension__ ({       unsigned long long __d2=SR_MASK_LL, __d1;       \
 110         __asm__ __volatile__(                                           \
 111                 "getcon " __SR ", %1\n\t"                               \
 112                 "or     %1, r63, %0\n\t"                                \
 113                 "or     %1, %2, %1\n\t"                                 \
 114                 "putcon %1, " __SR "\n\t"                               \
 115                 "and    %0, %2, %0"                                     \
 116                 : "=&r" (x), "=&r" (__d1)                               \
 117                 : "r" (__d2));}));
 118
 119 #define local_irq_restore(x) do {                                       \
 120         if ( ((x) & SR_MASK_L) == 0 )           /* dropping to 0 ? */   \
 121                 local_irq_enable();             /* yes...re-enable */   \
 122 } while (0)
 123
 124 #define irqs_disabled()                 \
 125 ({                                      \
 126         unsigned long flags;            \
 127         local_save_flags(flags);        \
 128         (flags != 0);                   \
 129 })
 130
 131 static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 132 {
 133         unsigned long flags, retval;
 134
 135         local_irq_save(flags);
 136         retval = *m;
 137         *m = val;
 138         local_irq_restore(flags);
 139         return retval;
 140 }
 141
 142 static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
 143 {
 144         unsigned long flags, retval;
 145
 146         local_irq_save(flags);
 147         retval = *m;
 148         *m = val & 0xff;
 149         local_irq_restore(flags);
 150         return retval;
 151 }
 152
 153 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 154 {
 155         switch (size) {
 156         case 4:
 157                 return xchg_u32(ptr, x);
 158                 break;
 159         case 1:
 160                 return xchg_u8(ptr, x);
 161                 break;
 162         }
 163         __xchg_called_with_bad_pointer();
 164         return x;
 165 }
 166
 167 /* XXX
 168  * disable hlt during certain critical i/o operations
 169  */
 170 #define HAVE_DISABLE_HLT
 171 void disable_hlt(void);
 172 void enable_hlt(void);
 173
 174
 175 #define smp_mb()        barrier()
 176 #define smp_rmb()       barrier()
 177 #define smp_wmb()       barrier()
 178
 179 #ifdef CONFIG_SH_ALPHANUMERIC
 180 /* This is only used for debugging. */
 181 extern void print_seg(char *file,int line);
 182 #define PLS() print_seg(__FILE__,__LINE__)
 183 #else   /* CONFIG_SH_ALPHANUMERIC */
 184 #define PLS()
 185 #endif  /* CONFIG_SH_ALPHANUMERIC */
 186
 187 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
 188
 189 #define arch_align_stack(x) (x)
 190
 191 #endif /* __ASM_SH64_SYSTEM_H */