1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Author: Huacai Chen <chenhuacai@loongson.cn> 4 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 5 */ 6 7 #ifndef __ASM_VDSO_H 8 #define __ASM_VDSO_H 9 10 #include <linux/mm_types.h> 11 #include <vdso/datapage.h> 12 13 #include <asm/barrier.h> 14 15 /* 16 * struct loongarch_vdso_info - Details of a VDSO image. 17 * @vdso: Pointer to VDSO image (page-aligned). 18 * @size: Size of the VDSO image (page-aligned). 19 * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline. 20 * @code_mapping: Special mapping structure for vdso code. 21 * @code_mapping: Special mapping structure for vdso data. 22 * 23 * This structure contains details of a VDSO image, including the image data 24 * and offsets of certain symbols required by the kernel. It is generated as 25 * part of the VDSO build process, aside from the mapping page array, which is 26 * populated at runtime. 27 */ 28 struct loongarch_vdso_info { 29 void *vdso; 30 unsigned long size; 31 unsigned long offset_sigreturn; 32 struct vm_special_mapping code_mapping; 33 struct vm_special_mapping data_mapping; 34 }; 35 36 extern struct loongarch_vdso_info vdso_info; 37 38 #endif /* __ASM_VDSO_H */ 39