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 #include <linux/bug.h>
  11
  12 #define __ctl_load(array, low, high) {                                  \
  13         typedef struct { char _[sizeof(array)]; } addrtype;             \
  14                                                                         \
  15         BUILD_BUG_ON(sizeof(addrtype) != (high - low + 1) * sizeof(long));\
  16         asm volatile(                                                   \
  17                 "       lctlg   %1,%2,%0\n"                             \
  18                 :                                                       \
  19                 : "Q" (*(addrtype *)(&array)), "i" (low), "i" (high)    \
  20                 : "memory");                                            \
  21 }
  22
  23 #define __ctl_store(array, low, high) {                                 \
  24         typedef struct { char _[sizeof(array)]; } addrtype;             \
  25                                                                         \
  26         BUILD_BUG_ON(sizeof(addrtype) != (high - low + 1) * sizeof(long));\
  27         asm volatile(                                                   \
  28                 "       stctg   %1,%2,%0\n"                             \
  29                 : "=Q" (*(addrtype *)(&array))                          \
  30                 : "i" (low), "i" (high));                               \
  31 }
  32
  33 static inline void __ctl_set_bit(unsigned int cr, unsigned int bit)
  34 {
  35         unsigned long reg;
  36
  37         __ctl_store(reg, cr, cr);
  38         reg |= 1UL << bit;
  39         __ctl_load(reg, cr, cr);
  40 }
  41
  42 static inline void __ctl_clear_bit(unsigned int cr, unsigned int bit)
  43 {
  44         unsigned long reg;
  45
  46         __ctl_store(reg, cr, cr);
  47         reg &= ~(1UL << bit);
  48         __ctl_load(reg, cr, cr);
  49 }
  50
  51 void smp_ctl_set_bit(int cr, int bit);
  52 void smp_ctl_clear_bit(int cr, int bit);
  53
  54 union ctlreg0 {
  55         unsigned long val;
  56         struct {
  57                 unsigned long      : 32;
  58                 unsigned long      : 3;
  59                 unsigned long lap  : 1; /* Low-address-protection control */
  60                 unsigned long      : 4;
  61                 unsigned long edat : 1; /* Enhanced-DAT-enablement control */
  62                 unsigned long      : 4;
  63                 unsigned long afp  : 1; /* AFP-register control */
  64                 unsigned long vx   : 1; /* Vector enablement control */
  65                 unsigned long      : 17;
  66         };
  67 };
  68
  69 #ifdef CONFIG_SMP
  70 # define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
  71 # define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
  72 #else
  73 # define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
  74 # define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
  75 #endif
  76
  77 #endif /* __ASM_CTL_REG_H */