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100 lines
1.9 KiB
100 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* FP/SIMD state saving and restoring |
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* |
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* Copyright (C) 2012 ARM Ltd. |
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* Author: Catalin Marinas <catalin.marinas@arm.com> |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include <asm/fpsimdmacros.h> |
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/* |
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* Save the FP registers. |
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* |
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* x0 - pointer to struct fpsimd_state |
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*/ |
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SYM_FUNC_START(fpsimd_save_state) |
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fpsimd_save x0, 8 |
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ret |
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SYM_FUNC_END(fpsimd_save_state) |
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/* |
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* Load the FP registers. |
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* |
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* x0 - pointer to struct fpsimd_state |
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*/ |
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SYM_FUNC_START(fpsimd_load_state) |
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fpsimd_restore x0, 8 |
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ret |
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SYM_FUNC_END(fpsimd_load_state) |
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#ifdef CONFIG_ARM64_SVE |
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/* |
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* Save the SVE state |
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* |
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* x0 - pointer to buffer for state |
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* x1 - pointer to storage for FPSR |
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*/ |
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SYM_FUNC_START(sve_save_state) |
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sve_save 0, x1, 2 |
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ret |
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SYM_FUNC_END(sve_save_state) |
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/* |
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* Load the SVE state |
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* |
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* x0 - pointer to buffer for state |
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* x1 - pointer to storage for FPSR |
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* x2 - VQ-1 |
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*/ |
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SYM_FUNC_START(sve_load_state) |
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sve_load 0, x1, x2, 3, x4 |
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ret |
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SYM_FUNC_END(sve_load_state) |
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SYM_FUNC_START(sve_get_vl) |
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_sve_rdvl 0, 1 |
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ret |
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SYM_FUNC_END(sve_get_vl) |
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SYM_FUNC_START(sve_set_vq) |
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sve_load_vq x0, x1, x2 |
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ret |
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SYM_FUNC_END(sve_set_vq) |
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/* |
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* Load SVE state from FPSIMD state. |
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* |
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* x0 = pointer to struct fpsimd_state |
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* x1 = VQ - 1 |
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* |
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* Each SVE vector will be loaded with the first 128-bits taken from FPSIMD |
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* and the rest zeroed. All the other SVE registers will be zeroed. |
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*/ |
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SYM_FUNC_START(sve_load_from_fpsimd_state) |
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sve_load_vq x1, x2, x3 |
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fpsimd_restore x0, 8 |
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sve_flush_p_ffr |
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ret |
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SYM_FUNC_END(sve_load_from_fpsimd_state) |
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/* |
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* Zero all SVE registers but the first 128-bits of each vector |
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* |
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* VQ must already be configured by caller, any further updates of VQ |
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* will need to ensure that the register state remains valid. |
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* |
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* x0 = VQ - 1 |
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*/ |
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SYM_FUNC_START(sve_flush_live) |
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cbz x0, 1f // A VQ-1 of 0 is 128 bits so no extra Z state |
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sve_flush_z |
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1: sve_flush_p_ffr |
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ret |
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SYM_FUNC_END(sve_flush_live) |
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#endif /* CONFIG_ARM64_SVE */
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