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 */ 33