LXR linux/arch/s390/include/uapi/asm/guarded

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _GUARDED_STORAGE_H
   3#define _GUARDED_STORAGE_H
   4
   5#include <linux/types.h>
   6
   7struct gs_cb {
   8        __u64 reserved;
   9        __u64 gsd;
  10        __u64 gssm;
  11        __u64 gs_epl_a;
  12};
  13
  14struct gs_epl {
  15        __u8 pad1;
  16        union {
  17                __u8 gs_eam;
  18                struct {
  19                        __u8    : 6;
  20                        __u8 e  : 1;
  21                        __u8 b  : 1;
  22                };
  23        };
  24        union {
  25                __u8 gs_eci;
  26                struct {
  27                        __u8 tx : 1;
  28                        __u8 cx : 1;
  29                        __u8    : 5;
  30                        __u8 in : 1;
  31                };
  32        };
  33        union {
  34                __u8 gs_eai;
  35                struct {
  36                        __u8    : 1;
  37                        __u8 t  : 1;
  38                        __u8 as : 2;
  39                        __u8 ar : 4;
  40                };
  41        };
  42        __u32 pad2;
  43        __u64 gs_eha;
  44        __u64 gs_eia;
  45        __u64 gs_eoa;
  46        __u64 gs_eir;
  47        __u64 gs_era;
  48};
  49
  50#define GS_ENABLE       0
  51#define GS_DISABLE      1
  52#define GS_SET_BC_CB    2
  53#define GS_CLEAR_BC_CB  3
  54#define GS_BROADCAST    4
  55
  56static inline void load_gs_cb(struct gs_cb *gs_cb)
  57{
  58        asm volatile(".insn rxy,0xe3000000004d,0,%0" : : "Q" (*gs_cb));
  59}
  60
  61static inline void store_gs_cb(struct gs_cb *gs_cb)
  62{
  63        asm volatile(".insn rxy,0xe30000000049,0,%0" : : "Q" (*gs_cb));
  64}
  65
  66static inline void save_gs_cb(struct gs_cb *gs_cb)
  67{
  68        if (gs_cb)
  69                store_gs_cb(gs_cb);
  70}
  71
  72static inline void restore_gs_cb(struct gs_cb *gs_cb)
  73{
  74        if (gs_cb)
  75                load_gs_cb(gs_cb);
  76}
  77
  78#endif /* _GUARDED_STORAGE_H */
  79