arch/s390/include/asm/ctl_reg.h

   1 /*
   2  * Copyright IBM Corp. 1999, 2009
   3  *
   4  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   5  */
   6
   7 #ifndef __ASM_CTL_REG_H
   8 #define __ASM_CTL_REG_H
   9
  10 #ifdef CONFIG_64BIT
  11 # define __CTL_LOAD     "lctlg"
  12 # define __CTL_STORE    "stctg"
  13 #else
  14 # define __CTL_LOAD     "lctl"
  15 # define __CTL_STORE    "stctl"
  16 #endif
  17
  18 #define __ctl_load(array, low, high) {                                  \
  19         typedef struct { char _[sizeof(array)]; } addrtype;             \
  20                                                                         \
  21         BUILD_BUG_ON(sizeof(addrtype) != (high - low + 1) * sizeof(long));\
  22         asm volatile(                                                   \
  23                 __CTL_LOAD " %1,%2,%0\n"                                \
  24                 : : "Q" (*(addrtype *)(&array)), "i" (low), "i" (high));\
  25 }
  26
  27 #define __ctl_store(array, low, high) {                                 \
  28         typedef struct { char _[sizeof(array)]; } addrtype;             \
  29                                                                         \
  30         BUILD_BUG_ON(sizeof(addrtype) != (high - low + 1) * sizeof(long));\
  31         asm volatile(                                                   \
  32                 __CTL_STORE " %1,%2,%0\n"                               \
  33                 : "=Q" (*(addrtype *)(&array))                          \
  34                 : "i" (low), "i" (high));                               \
  35 }
  36
  37 static inline void __ctl_set_bit(unsigned int cr, unsigned int bit)
  38 {
  39         unsigned long reg;
  40
  41         __ctl_store(reg, cr, cr);
  42         reg |= 1UL << bit;
  43         __ctl_load(reg, cr, cr);
  44 }
  45
  46 static inline void __ctl_clear_bit(unsigned int cr, unsigned int bit)
  47 {
  48         unsigned long reg;
  49
  50         __ctl_store(reg, cr, cr);
  51         reg &= ~(1UL << bit);
  52         __ctl_load(reg, cr, cr);
  53 }
  54
  55 void smp_ctl_set_bit(int cr, int bit);
  56 void smp_ctl_clear_bit(int cr, int bit);
  57
  58 #ifdef CONFIG_SMP
  59 # define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
  60 # define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
  61 #else
  62 # define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
  63 # define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
  64 #endif
  65
  66 #endif /* __ASM_CTL_REG_H */