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-rw-r--r--arch/s390/include/uapi/asm/guarded_storage.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/guarded_storage.h b/arch/s390/include/uapi/asm/guarded_storage.h
new file mode 100644
index 000000000..666af1c33
--- /dev/null
+++ b/arch/s390/include/uapi/asm/guarded_storage.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _GUARDED_STORAGE_H
+#define _GUARDED_STORAGE_H
+
+#include <linux/types.h>
+
+struct gs_cb {
+ __u64 reserved;
+ __u64 gsd;
+ __u64 gssm;
+ __u64 gs_epl_a;
+};
+
+struct gs_epl {
+ __u8 pad1;
+ union {
+ __u8 gs_eam;
+ struct {
+ __u8 : 6;
+ __u8 e : 1;
+ __u8 b : 1;
+ };
+ };
+ union {
+ __u8 gs_eci;
+ struct {
+ __u8 tx : 1;
+ __u8 cx : 1;
+ __u8 : 5;
+ __u8 in : 1;
+ };
+ };
+ union {
+ __u8 gs_eai;
+ struct {
+ __u8 : 1;
+ __u8 t : 1;
+ __u8 as : 2;
+ __u8 ar : 4;
+ };
+ };
+ __u32 pad2;
+ __u64 gs_eha;
+ __u64 gs_eia;
+ __u64 gs_eoa;
+ __u64 gs_eir;
+ __u64 gs_era;
+};
+
+#define GS_ENABLE 0
+#define GS_DISABLE 1
+#define GS_SET_BC_CB 2
+#define GS_CLEAR_BC_CB 3
+#define GS_BROADCAST 4
+
+static inline void load_gs_cb(struct gs_cb *gs_cb)
+{
+ asm volatile(".insn rxy,0xe3000000004d,0,%0" : : "Q" (*gs_cb));
+}
+
+static inline void store_gs_cb(struct gs_cb *gs_cb)
+{
+ asm volatile(".insn rxy,0xe30000000049,0,%0" : : "Q" (*gs_cb));
+}
+
+static inline void save_gs_cb(struct gs_cb *gs_cb)
+{
+ if (gs_cb)
+ store_gs_cb(gs_cb);
+}
+
+static inline void restore_gs_cb(struct gs_cb *gs_cb)
+{
+ if (gs_cb)
+ load_gs_cb(gs_cb);
+}
+
+#endif /* _GUARDED_STORAGE_H */