arch/s390/include/uapi/asm/guarded_storage.h

   1 #ifndef _GUARDED_STORAGE_H
   2 #define _GUARDED_STORAGE_H
   3
   4 #include <linux/types.h>
   5
   6 struct gs_cb {
   7         __u64 reserved;
   8         __u64 gsd;
   9         __u64 gssm;
  10         __u64 gs_epl_a;
  11 };
  12
  13 struct gs_epl {
  14         __u8 pad1;
  15         union {
  16                 __u8 gs_eam;
  17                 struct {
  18                         __u8    : 6;
  19                         __u8 e  : 1;
  20                         __u8 b  : 1;
  21                 };
  22         };
  23         union {
  24                 __u8 gs_eci;
  25                 struct {
  26                         __u8 tx : 1;
  27                         __u8 cx : 1;
  28                         __u8    : 5;
  29                         __u8 in : 1;
  30                 };
  31         };
  32         union {
  33                 __u8 gs_eai;
  34                 struct {
  35                         __u8    : 1;
  36                         __u8 t  : 1;
  37                         __u8 as : 2;
  38                         __u8 ar : 4;
  39                 };
  40         };
  41         __u32 pad2;
  42         __u64 gs_eha;
  43         __u64 gs_eia;
  44         __u64 gs_eoa;
  45         __u64 gs_eir;
  46         __u64 gs_era;
  47 };
  48
  49 #define GS_ENABLE       0
  50 #define GS_DISABLE      1
  51 #define GS_SET_BC_CB    2
  52 #define GS_CLEAR_BC_CB  3
  53 #define GS_BROADCAST    4
  54
  55 static inline void load_gs_cb(struct gs_cb *gs_cb)
  56 {
  57         asm volatile(".insn rxy,0xe3000000004d,0,%0" : : "Q" (*gs_cb));
  58 }
  59
  60 static inline void store_gs_cb(struct gs_cb *gs_cb)
  61 {
  62         asm volatile(".insn rxy,0xe30000000049,0,%0" : : "Q" (*gs_cb));
  63 }
  64
  65 static inline void save_gs_cb(struct gs_cb *gs_cb)
  66 {
  67         if (gs_cb)
  68                 store_gs_cb(gs_cb);
  69 }
  70
  71 static inline void restore_gs_cb(struct gs_cb *gs_cb)
  72 {
  73         if (gs_cb)
  74                 load_gs_cb(gs_cb);
  75 }
  76
  77 #endif /* _GUARDED_STORAGE_H */