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.com> 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-bits of each vector 72 * 73 * VQ must already be configured by caller, any further updates of VQ 74 * will need to ensure that the register state remains valid. 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 is 128 bits so no extra Z state 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 = VL/8 110 sme_save_za 0, x2, 12 // Leaves x0 pointing to the end of ZA 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 = VL/8 126 sme_load_za 0, x2, 12 // Leaves x0 pointing to the end of ZA 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 */
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