1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Author: Huacai Chen <chenhuacai@loongson.cn> 4 * Copyright (C) 2020 Loongson Technology Corporation Limited 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #ifndef __ASM_VDSO_H 13 #define __ASM_VDSO_H 14 15 #include <linux/mm.h> 16 #include <linux/mm_types.h> 17 #include <vdso/datapage.h> 18 19 #include <asm/barrier.h> 20 21 /* 22 * struct loongarch_vdso_info - Details of a VDSO image. 23 * @vdso: Pointer to VDSO image (page-aligned). 24 * @size: Size of the VDSO image (page-aligned). 25 * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline. 26 * @code_mapping: Special mapping structure for vdso code. 27 * @code_mapping: Special mapping structure for vdso data. 28 * 29 * This structure contains details of a VDSO image, including the image data 30 * and offsets of certain symbols required by the kernel. It is generated as 31 * part of the VDSO build process, aside from the mapping page array, which is 32 * populated at runtime. 33 */ 34 struct loongarch_vdso_info { 35 void *vdso; 36 unsigned long size; 37 unsigned long offset_sigreturn; 38 struct vm_special_mapping code_mapping; 39 struct vm_special_mapping data_mapping; 40 }; 41 42 extern struct loongarch_vdso_info vdso_info; 43 44 #endif /* __ASM_VDSO_H */ 45