1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * FP/SIMD state saving and restoring
4 *
5 * Copyright (C) 2012 ARM Ltd.
6 * Author: Catalin Marinas <catalin.marinas@arm
7 */
8
9 #include <linux/linkage.h>
10
11 #include <asm/assembler.h>
12 #include <asm/fpsimdmacros.h>
13
14 /*
15 * Save the FP registers.
16 *
17 * x0 - pointer to struct fpsimd_state
18 */
19 SYM_FUNC_START(fpsimd_save_state)
20 fpsimd_save x0, 8
21 ret
22 SYM_FUNC_END(fpsimd_save_state)
23
24 /*
25 * Load the FP registers.
26 *
27 * x0 - pointer to struct fpsimd_state
28 */
29 SYM_FUNC_START(fpsimd_load_state)
30 fpsimd_restore x0, 8
31 ret
32 SYM_FUNC_END(fpsimd_load_state)
33
34 #ifdef CONFIG_ARM64_SVE
35
36 /*
37 * Save the SVE state
38 *
39 * x0 - pointer to buffer for state
40 * x1 - pointer to storage for FPSR
41 * x2 - Save FFR if non-zero
42 */
43 SYM_FUNC_START(sve_save_state)
44 sve_save 0, x1, x2, 3
45 ret
46 SYM_FUNC_END(sve_save_state)
47
48 /*
49 * Load the SVE state
50 *
51 * x0 - pointer to buffer for state
52 * x1 - pointer to storage for FPSR
53 * x2 - Restore FFR if non-zero
54 */
55 SYM_FUNC_START(sve_load_state)
56 sve_load 0, x1, x2, 4
57 ret
58 SYM_FUNC_END(sve_load_state)
59
60 SYM_FUNC_START(sve_get_vl)
61 _sve_rdvl 0, 1
62 ret
63 SYM_FUNC_END(sve_get_vl)
64
65 SYM_FUNC_START(sve_set_vq)
66 sve_load_vq x0, x1, x2
67 ret
68 SYM_FUNC_END(sve_set_vq)
69
70 /*
71 * Zero all SVE registers but the first 128-bi
72 *
73 * VQ must already be configured by caller, an
74 * will need to ensure that the register state
75 *
76 * x0 = include FFR?
77 * x1 = VQ - 1
78 */
79 SYM_FUNC_START(sve_flush_live)
80 cbz x1, 1f // A VQ-1 of 0
81 sve_flush_z
82 1: sve_flush_p
83 tbz x0, #0, 2f
84 sve_flush_ffr
85 2: ret
86 SYM_FUNC_END(sve_flush_live)
87
88 #endif /* CONFIG_ARM64_SVE */
89
90 #ifdef CONFIG_ARM64_SME
91
92 SYM_FUNC_START(sme_get_vl)
93 _sme_rdsvl 0, 1
94 ret
95 SYM_FUNC_END(sme_get_vl)
96
97 SYM_FUNC_START(sme_set_vq)
98 sme_load_vq x0, x1, x2
99 ret
100 SYM_FUNC_END(sme_set_vq)
101
102 /*
103 * Save the ZA and ZT state
104 *
105 * x0 - pointer to buffer for state
106 * x1 - number of ZT registers to save
107 */
108 SYM_FUNC_START(sme_save_state)
109 _sme_rdsvl 2, 1 // x2
110 sme_save_za 0, x2, 12 // Lea
111
112 cbz x1, 1f
113 _str_zt 0
114 1:
115 ret
116 SYM_FUNC_END(sme_save_state)
117
118 /*
119 * Load the ZA and ZT state
120 *
121 * x0 - pointer to buffer for state
122 * x1 - number of ZT registers to save
123 */
124 SYM_FUNC_START(sme_load_state)
125 _sme_rdsvl 2, 1 // x2
126 sme_load_za 0, x2, 12 // Lea
127
128 cbz x1, 1f
129 _ldr_zt 0
130 1:
131 ret
132 SYM_FUNC_END(sme_load_state)
133
134 #endif /* CONFIG_ARM64_SME */
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.