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 #ifndef CONFIG_GENERIC_TIME_VSYSCALL 14 struct vdso_data { 15 }; 16 #endif 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 32 asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t); 33 34 #endif /* _ASM_RISCV_VDSO_H */ 35