include/asm-arm/proc-armv/system.h

   1 /*
   2  * linux/include/asm-arm/proc-armv/system.h
   3  *
   4  * Copyright (C) 1996 Russell King
   5  */
   6
   7 #ifndef __ASM_PROC_SYSTEM_H
   8 #define __ASM_PROC_SYSTEM_H
   9
  10 extern __inline__ unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
  11 {
  12         extern void __bad_xchg(volatile void *, int);
  13
  14         switch (size) {
  15                 case 1: __asm__ __volatile__ ("swpb %0, %1, [%2]" : "=r" (x) : "r" (x), "r" (ptr) : "memory");
  16                         break;
  17                 case 4: __asm__ __volatile__ ("swp %0, %1, [%2]" : "=r" (x) : "r" (x), "r" (ptr) : "memory");
  18                         break;
  19                 default: __bad_xchg(ptr, size);
  20         }
  21         return x;
  22 }
  23
  24 #define set_cr(x)                                       \
  25         __asm__ __volatile__(                           \
  26         "mcr    p15, 0, %0, c1, c0      @ set CR"       \
  27         : : "r" (x))
  28
  29 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
  30 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
  31
  32 /*
  33  * A couple of speedups for the ARM
  34  */
  35
  36 /*
  37  * Save the current interrupt enable state & disable IRQs
  38  */
  39 #define __save_flags_cli(x)                                     \
  40         ({                                                      \
  41                 unsigned long temp;                             \
  42         __asm__ __volatile__(                                   \
  43         "mrs    %0, cpsr                @ save_flags_cli\n"     \
  44 "       orr     %1, %0, #128\n"                                 \
  45 "       msr     cpsr_c, %1"                                     \
  46         : "=r" (x), "=r" (temp)                                 \
  47         :                                                       \
  48         : "memory");                                            \
  49         })
  50
  51 /*
  52  * Enable IRQs
  53  */
  54 #define __sti()                                                 \
  55         ({                                                      \
  56                 unsigned long temp;                             \
  57         __asm__ __volatile__(                                   \
  58         "mrs    %0, cpsr                @ sti\n"                \
  59 "       bic     %0, %0, #128\n"                                 \
  60 "       msr     cpsr_c, %0"                                     \
  61         : "=r" (temp)                                           \
  62         :                                                       \
  63         : "memory");                                            \
  64         })
  65
  66 /*
  67  * Disable IRQs
  68  */
  69 #define __cli()                                                 \
  70         ({                                                      \
  71                 unsigned long temp;                             \
  72         __asm__ __volatile__(                                   \
  73         "mrs    %0, cpsr                @ cli\n"                \
  74 "       orr     %0, %0, #128\n"                                 \
  75 "       msr     cpsr_c, %0"                                     \
  76         : "=r" (temp)                                           \
  77         :                                                       \
  78         : "memory");                                            \
  79         })
  80
  81 /*
  82  * Enable FIQs
  83  */
  84 #define __stf()                                                 \
  85         ({                                                      \
  86                 unsigned long temp;                             \
  87         __asm__ __volatile__(                                   \
  88         "mrs    %0, cpsr                @ stf\n"                \
  89 "       bic     %0, %0, #64\n"                                  \
  90 "       msr     cpsr_c, %0"                                     \
  91         : "=r" (temp)                                           \
  92         :                                                       \
  93         : "memory");                                            \
  94         })
  95
  96 /*
  97  * Disable FIQs
  98  */
  99 #define __clf()                                                 \
 100         ({                                                      \
 101                 unsigned long temp;                             \
 102         __asm__ __volatile__(                                   \
 103         "mrs    %0, cpsr                @ clf\n"                \
 104 "       orr     %0, %0, #64\n"                                  \
 105 "       msr     cpsr_c, %0"                                     \
 106         : "=r" (temp)                                           \
 107         :                                                       \
 108         : "memory");                                            \
 109         })
 110
 111 /*
 112  * Enable FIQs
 113  */
 114 #define __stf()                                                 \
 115         ({                                                      \
 116                 unsigned long temp;                             \
 117         __asm__ __volatile__(                                   \
 118         "mrs    %0, cpsr                @ stf\n"                \
 119 "       bic     %0, %0, #64\n"                                  \
 120 "       msr     cpsr_c, %0"                                     \
 121         : "=r" (temp)                                           \
 122         :                                                       \
 123         : "memory");                                            \
 124         })
 125
 126 /*
 127  * Disable FIQs
 128  */
 129 #define __clf()                                                 \
 130         ({                                                      \
 131                 unsigned long temp;                             \
 132         __asm__ __volatile__(                                   \
 133         "mrs    %0, cpsr                @ clf\n"                \
 134 "       orr     %0, %0, #64\n"                                  \
 135 "       msr     cpsr_c, %0"                                     \
 136         : "=r" (temp)                                           \
 137         :                                                       \
 138         : "memory");                                            \
 139         })
 140
 141 /*
 142  * save current IRQ & FIQ state
 143  */
 144 #define __save_flags(x)                                         \
 145         __asm__ __volatile__(                                   \
 146         "mrs    %0, cpsr                @ save_flags\n"         \
 147           : "=r" (x)                                            \
 148           :                                                     \
 149           : "memory")
 150
 151 /*
 152  * restore saved IRQ & FIQ state
 153  */
 154 #define __restore_flags(x)                                      \
 155         __asm__ __volatile__(                                   \
 156         "msr    cpsr_c, %0              @ restore_flags\n"      \
 157         :                                                       \
 158         : "r" (x)                                               \
 159         : "memory")
 160
 161 #endif