[mirror_ubuntu-jammy-kernel.git] / arch / riscv / include / asm / vdso.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 ARM Limited
 * Copyright (C) 2014 Regents of the University of California
 * Copyright (C) 2017 SiFive
 */

#ifndef _ASM_RISCV_VDSO_H
#define _ASM_RISCV_VDSO_H

#include <linux/types.h>

#ifndef CONFIG_GENERIC_TIME_VSYSCALL
struct vdso_data {
};
#endif

/*
 * The VDSO symbols are mapped into Linux so we can just use regular symbol
 * addressing to get their offsets in userspace.  The symbols are mapped at an
 * offset of 0, but since the linker must support setting weak undefined
 * symbols to the absolute address 0 it also happens to support other low
 * addresses even when the code model suggests those low addresses would not
 * otherwise be availiable.
 */
#define VDSO_SYMBOL(base, name)							\
({										\
	extern const char __vdso_##name[];					\
	(void __user *)((unsigned long)(base) + __vdso_##name);			\
})

asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);

#endif /* _ASM_RISCV_VDSO_H */
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
e2c0cdfb PD	2	/*
	3	* Copyright (C) 2012 ARM Limited
	4	* Copyright (C) 2014 Regents of the University of California
	5	* Copyright (C) 2017 SiFive
e2c0cdfb PD	6	*/
	7
	8	#ifndef _ASM_RISCV_VDSO_H
	9	#define _ASM_RISCV_VDSO_H
	10
	11	#include <linux/types.h>
	12
0aa2ec8a	13	#ifndef CONFIG_GENERIC_TIME_VSYSCALL
e2c0cdfb PD	14	struct vdso_data {
e2c0cdfb PD	15	};
ad5d1122	16	#endif
e2c0cdfb PD	17
	18	/*
	19	* The VDSO symbols are mapped into Linux so we can just use regular symbol
	20	* addressing to get their offsets in userspace. The symbols are mapped at an
	21	* offset of 0, but since the linker must support setting weak undefined
	22	* symbols to the absolute address 0 it also happens to support other low
	23	* addresses even when the code model suggests those low addresses would not
	24	* otherwise be availiable.
	25	*/
	26	#define VDSO_SYMBOL(base, name) \
	27	({ \
	28	extern const char __vdso_##name[]; \
	29	(void __user *)((unsigned long)(base) + __vdso_##name); \
	30	})
	31
921ebd8f	32	asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
921ebd8f	33
e2c0cdfb	34	#endif /* _ASM_RISCV_VDSO_H */