xref: /openbmc/linux/arch/loongarch/include/asm/vdso.h (revision 7fc96d71)
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