include/asm-sh64/system.h

   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 #define tas(ptr) (xchg((ptr), 1))
  47
  48 extern void __xchg_called_with_bad_pointer(void);
  49
  50 #define mb()    __asm__ __volatile__ ("synco": : :"memory")
  51 #define rmb()   mb()
  52 #define wmb()   __asm__ __volatile__ ("synco": : :"memory")
  53 #define read_barrier_depends()  do { } while (0)
  54
  55 #ifdef CONFIG_SMP
  56 #define smp_mb()        mb()
  57 #define smp_rmb()       rmb()
  58 #define smp_wmb()       wmb()
  59 #define smp_read_barrier_depends()      read_barrier_depends()
  60 #else
  61 #define smp_mb()        barrier()
  62 #define smp_rmb()       barrier()
  63 #define smp_wmb()       barrier()
  64 #define smp_read_barrier_depends()      do { } while (0)
  65 #endif /* CONFIG_SMP */
  66
  67 #define set_rmb(var, value) do { (void)xchg(&var, value); } while (0)
  68 #define set_mb(var, value) set_rmb(var, value)
  69
  70 /* Interrupt Control */
  71 #ifndef HARD_CLI
  72 #define SR_MASK_L 0x000000f0L
  73 #define SR_MASK_LL 0x00000000000000f0LL
  74 #else
  75 #define SR_MASK_L 0x10000000L
  76 #define SR_MASK_LL 0x0000000010000000LL
  77 #endif
  78
  79 static __inline__ void local_irq_enable(void)
  80 {
  81         /* cli/sti based on SR.BL */
  82         unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
  83
  84         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  85                              "and       %0, %1, %0\n\t"
  86                              "putcon    %0, " __SR "\n\t"
  87                              : "=&r" (__dummy0)
  88                              : "r" (__dummy1));
  89 }
  90
  91 static __inline__ void local_irq_disable(void)
  92 {
  93         /* cli/sti based on SR.BL */
  94         unsigned long long __dummy0, __dummy1=SR_MASK_LL;
  95         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  96                              "or        %0, %1, %0\n\t"
  97                              "putcon    %0, " __SR "\n\t"
  98                              : "=&r" (__dummy0)
  99                              : "r" (__dummy1));
 100 }
 101
 102 #define local_save_flags(x)                                             \
 103 (__extension__ ({       unsigned long long __dummy=SR_MASK_LL;          \
 104         __asm__ __volatile__(                                           \
 105                 "getcon " __SR ", %0\n\t"                               \
 106                 "and    %0, %1, %0"                                     \
 107                 : "=&r" (x)                                             \
 108                 : "r" (__dummy));}))
 109
 110 #define local_irq_save(x)                                               \
 111 (__extension__ ({       unsigned long long __d2=SR_MASK_LL, __d1;       \
 112         __asm__ __volatile__(                                           \
 113                 "getcon " __SR ", %1\n\t"                               \
 114                 "or     %1, r63, %0\n\t"                                \
 115                 "or     %1, %2, %1\n\t"                                 \
 116                 "putcon %1, " __SR "\n\t"                               \
 117                 "and    %0, %2, %0"                                     \
 118                 : "=&r" (x), "=&r" (__d1)                               \
 119                 : "r" (__d2));}));
 120
 121 #define local_irq_restore(x) do {                                       \
 122         if ( ((x) & SR_MASK_L) == 0 )           /* dropping to 0 ? */   \
 123                 local_irq_enable();             /* yes...re-enable */   \
 124 } while (0)
 125
 126 #define irqs_disabled()                 \
 127 ({                                      \
 128         unsigned long flags;            \
 129         local_save_flags(flags);        \
 130         (flags != 0);                   \
 131 })
 132
 133 static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 134 {
 135         unsigned long flags, retval;
 136
 137         local_irq_save(flags);
 138         retval = *m;
 139         *m = val;
 140         local_irq_restore(flags);
 141         return retval;
 142 }
 143
 144 static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
 145 {
 146         unsigned long flags, retval;
 147
 148         local_irq_save(flags);
 149         retval = *m;
 150         *m = val & 0xff;
 151         local_irq_restore(flags);
 152         return retval;
 153 }
 154
 155 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 156 {
 157         switch (size) {
 158         case 4:
 159                 return xchg_u32(ptr, x);
 160                 break;
 161         case 1:
 162                 return xchg_u8(ptr, x);
 163                 break;
 164         }
 165         __xchg_called_with_bad_pointer();
 166         return x;
 167 }
 168
 169 /* XXX
 170  * disable hlt during certain critical i/o operations
 171  */
 172 #define HAVE_DISABLE_HLT
 173 void disable_hlt(void);
 174 void enable_hlt(void);
 175
 176
 177 #define smp_mb()        barrier()
 178 #define smp_rmb()       barrier()
 179 #define smp_wmb()       barrier()
 180
 181 #ifdef CONFIG_SH_ALPHANUMERIC
 182 /* This is only used for debugging. */
 183 extern void print_seg(char *file,int line);
 184 #define PLS() print_seg(__FILE__,__LINE__)
 185 #else   /* CONFIG_SH_ALPHANUMERIC */
 186 #define PLS()
 187 #endif  /* CONFIG_SH_ALPHANUMERIC */
 188
 189 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
 190
 191 #define arch_align_stack(x) (x)
 192
 193 #endif /* __ASM_SH64_SYSTEM_H */