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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/include/uapi/asm/guarded_storage.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _GUARDED_STORAGE_H

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#define _GUARDED_STORAGE_H

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#include <linux/types.h>

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struct gs_cb {

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	__u64 reserved;

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	__u64 gsd;

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	__u64 gssm;

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	__u64 gs_epl_a;

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};

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struct gs_epl {

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	__u8 pad1;

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	union {

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		__u8 gs_eam;

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		struct {

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			__u8	: 6;

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			__u8 e	: 1;

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			__u8 b	: 1;

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		};

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	};

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	union {

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		__u8 gs_eci;

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		struct {

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			__u8 tx	: 1;

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			__u8 cx	: 1;

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			__u8	: 5;

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			__u8 in	: 1;

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		};

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	};

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	union {

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		__u8 gs_eai;

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		struct {

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			__u8	: 1;

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			__u8 t	: 1;

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			__u8 as	: 2;

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			__u8 ar	: 4;

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		};

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	};

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	__u32 pad2;

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	__u64 gs_eha;

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	__u64 gs_eia;

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	__u64 gs_eoa;

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	__u64 gs_eir;

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	__u64 gs_era;

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};

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#define GS_ENABLE	0

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#define	GS_DISABLE	1

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#define GS_SET_BC_CB	2

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#define GS_CLEAR_BC_CB	3

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#define GS_BROADCAST	4

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static inline void load_gs_cb(struct gs_cb *gs_cb)

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{

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	asm volatile(".insn rxy,0xe3000000004d,0,%0" : : "Q" (*gs_cb));

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}

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static inline void store_gs_cb(struct gs_cb *gs_cb)

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{

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	asm volatile(".insn rxy,0xe30000000049,0,%0" : : "Q" (*gs_cb));

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}

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static inline void save_gs_cb(struct gs_cb *gs_cb)

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{

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	if (gs_cb)

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		store_gs_cb(gs_cb);

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}

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static inline void restore_gs_cb(struct gs_cb *gs_cb)

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{

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	if (gs_cb)

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		load_gs_cb(gs_cb);

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}

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#endif /* _GUARDED_STORAGE_H */

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