1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright (C) 2015 Imagination Technologies
4  * Author: Alex Smith <alex.smith@imgtec.com>
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 mips_vdso_image - Details of a VDSO image.
17  * @data: Pointer to VDSO image data (page-aligned).
18  * @size: Size of the VDSO image data (page-aligned).
19  * @off_sigreturn: Offset of the sigreturn() trampoline.
20  * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline.
21  * @mapping: Special mapping structure.
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 mips_vdso_image {
29 	void *data;
30 	unsigned long size;
31 
32 	unsigned long off_sigreturn;
33 	unsigned long off_rt_sigreturn;
34 
35 	struct vm_special_mapping mapping;
36 };
37 
38 /*
39  * The following structures are auto-generated as part of the build for each
40  * ABI by genvdso, see arch/mips/vdso/Makefile.
41  */
42 
43 extern struct mips_vdso_image vdso_image;
44 
45 #ifdef CONFIG_MIPS32_O32
46 extern struct mips_vdso_image vdso_image_o32;
47 #endif
48 
49 #ifdef CONFIG_MIPS32_N32
50 extern struct mips_vdso_image vdso_image_n32;
51 #endif
52 
53 union mips_vdso_data {
54 	struct vdso_data data[CS_BASES];
55 	u8 page[PAGE_SIZE];
56 };
57 
58 #endif /* __ASM_VDSO_H */
59