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