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
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