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.h> 11 #include <linux/mm_types.h> 12 #include <vdso/datapage.h> 13 14 #include <asm/barrier.h> 15 16 /* 17 * struct loongarch_vdso_info - Details of a VDSO image. 18 * @vdso: Pointer to VDSO image (page-aligned). 19 * @size: Size of the VDSO image (page-aligned). 20 * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline. 21 * @code_mapping: Special mapping structure for vdso code. 22 * @code_mapping: Special mapping structure for vdso data. 23 * 24 * This structure contains details of a VDSO image, including the image data 25 * and offsets of certain symbols required by the kernel. It is generated as 26 * part of the VDSO build process, aside from the mapping page array, which is 27 * populated at runtime. 28 */ 29 struct loongarch_vdso_info { 30 void *vdso; 31 unsigned long size; 32 unsigned long offset_sigreturn; 33 struct vm_special_mapping code_mapping; 34 struct vm_special_mapping data_mapping; 35 }; 36 37 extern struct loongarch_vdso_info vdso_info; 38 39 #endif /* __ASM_VDSO_H */ 40