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