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