1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Author: Huacai Chen <chenhuacai@loongson.cn>
4 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
5 */
6
7 #ifndef __ASSEMBLY__
8
9 #include <asm/asm.h>
10 #include <asm/page.h>
11 #include <asm/vdso.h>
12
13 struct vdso_pcpu_data {
14 u32 node;
15 } ____cacheline_aligned_in_smp;
16
17 struct loongarch_vdso_data {
18 struct vdso_pcpu_data pdata[NR_CPUS];
19 };
20
21 /*
22 * The layout of vvar:
23 *
24 * high
25 * +---------------------+--------------------------+
26 * | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE |
27 * +---------------------+--------------------------+
28 * | time-ns vdso data | PAGE_SIZE |
29 * +---------------------+--------------------------+
30 * | generic vdso data | PAGE_SIZE |
31 * +---------------------+--------------------------+
32 * low
33 */
34 #define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
35 #define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT)
36
37 enum vvar_pages {
38 VVAR_GENERIC_PAGE_OFFSET,
39 VVAR_TIMENS_PAGE_OFFSET,
40 VVAR_LOONGARCH_PAGES_START,
41 VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1,
42 VVAR_NR_PAGES,
43 };
44
45 #define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
46
47 static inline unsigned long get_vdso_base(void)
48 {
49 unsigned long addr;
50
51 __asm__(
52 " la.pcrel %0, _start\n"
53 : "=r" (addr)
54 :
55 :);
56
57 return addr;
58 }
59
60 static inline unsigned long get_vdso_data(void)
61 {
62 return get_vdso_base() - VVAR_SIZE;
63 }
64
65 #endif /* __ASSEMBLY__ */
66
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.