1 /* 2 * Copyright (C) 2012 ARM Limited 3 * Copyright (C) 2014 Regents of the University of California 4 * Copyright (C) 2017 SiFive 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef _ASM_RISCV_VDSO_H 20 #define _ASM_RISCV_VDSO_H 21 22 #include <linux/types.h> 23 24 struct vdso_data { 25 }; 26 27 /* 28 * The VDSO symbols are mapped into Linux so we can just use regular symbol 29 * addressing to get their offsets in userspace. The symbols are mapped at an 30 * offset of 0, but since the linker must support setting weak undefined 31 * symbols to the absolute address 0 it also happens to support other low 32 * addresses even when the code model suggests those low addresses would not 33 * otherwise be availiable. 34 */ 35 #define VDSO_SYMBOL(base, name) \ 36 ({ \ 37 extern const char __vdso_##name[]; \ 38 (void __user *)((unsigned long)(base) + __vdso_##name); \ 39 }) 40 41 asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t); 42 43 #endif /* _ASM_RISCV_VDSO_H */ 44