linux/arch/arm64/kernel/entry-fpsimd.S

/*
 * FP/SIMD state saving and restoring
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/linkage.h>

#include <asm/assembler.h>
#include <asm/fpsimdmacros.h>

/*
 * Save the FP registers.
 *
 * x0 - pointer to struct fpsimd_state
 */
ENTRY(fpsimd_save_state)
	fpsimd_save x0, 8
	ret
ENDPROC(fpsimd_save_state)

/*
 * Load the FP registers.
 *
 * x0 - pointer to struct fpsimd_state
 */
ENTRY(fpsimd_load_state)
	fpsimd_restore x0, 8
	ret
ENDPROC(fpsimd_load_state)

#ifdef CONFIG_KERNEL_MODE_NEON

/*
 * Save the bottom n FP registers.
 *
 * x0 - pointer to struct fpsimd_partial_state
 */
ENTRY(fpsimd_save_partial_state)
	fpsimd_save_partial x0, 1, 8, 9
	ret
ENDPROC(fpsimd_save_partial_state)

/*
 * Load the bottom n FP registers.
 *
 * x0 - pointer to struct fpsimd_partial_state
 */
ENTRY(fpsimd_load_partial_state)
	fpsimd_restore_partial x0, 8, 9
	ret
ENDPROC(fpsimd_load_partial_state)

#endif
arm64: Floating point and SIMD This patch adds support for FP/ASIMD register bank saving and restoring during context switch and FP exception handling to generate SIGFPE. There are 32 128-bit registers and the context switching is currently done non-lazily. Benchmarks on real hardware are required before implementing lazy FP state saving/restoring. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> 2012-03-05 11:49:32 +00:00			`/*`
			`* FP/SIMD state saving and restoring`
			`*`
			`* Copyright (C) 2012 ARM Ltd.`
			`* Author: Catalin Marinas <catalin.marinas@arm.com>`
			`*`
			`* This program is free software; you can redistribute it and/or modify`
			`* it under the terms of the GNU General Public License version 2 as`
			`* published by the Free Software Foundation.`
			`*`
			`* This program is distributed in the hope that it will be useful,`
			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
			`* GNU General Public License for more details.`
			`*`
			`* You should have received a copy of the GNU General Public License`
			`* along with this program. If not, see <http://www.gnu.org/licenses/>.`
			`*/`

			`#include <linux/linkage.h>`

			`#include <asm/assembler.h>`
arm64: move FP-SIMD save/restore code to a macro In order to be able to reuse the save-restore code in KVM, move it to a pair of macros, similar to what the 32bit code does. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2012-11-12 13:24:27 +00:00			`#include <asm/fpsimdmacros.h>`
arm64: Floating point and SIMD This patch adds support for FP/ASIMD register bank saving and restoring during context switch and FP exception handling to generate SIGFPE. There are 32 128-bit registers and the context switching is currently done non-lazily. Benchmarks on real hardware are required before implementing lazy FP state saving/restoring. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> 2012-03-05 11:49:32 +00:00
			`/*`
			`* Save the FP registers.`
			`*`
			`* x0 - pointer to struct fpsimd_state`
			`*/`
			`ENTRY(fpsimd_save_state)`
arm64: move FP-SIMD save/restore code to a macro In order to be able to reuse the save-restore code in KVM, move it to a pair of macros, similar to what the 32bit code does. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2012-11-12 13:24:27 +00:00			`fpsimd_save x0, 8`
arm64: Floating point and SIMD This patch adds support for FP/ASIMD register bank saving and restoring during context switch and FP exception handling to generate SIGFPE. There are 32 128-bit registers and the context switching is currently done non-lazily. Benchmarks on real hardware are required before implementing lazy FP state saving/restoring. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> 2012-03-05 11:49:32 +00:00			`ret`
			`ENDPROC(fpsimd_save_state)`

			`/*`
			`* Load the FP registers.`
			`*`
			`* x0 - pointer to struct fpsimd_state`
			`*/`
			`ENTRY(fpsimd_load_state)`
arm64: move FP-SIMD save/restore code to a macro In order to be able to reuse the save-restore code in KVM, move it to a pair of macros, similar to what the 32bit code does. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2012-11-12 13:24:27 +00:00			`fpsimd_restore x0, 8`
arm64: Floating point and SIMD This patch adds support for FP/ASIMD register bank saving and restoring during context switch and FP exception handling to generate SIGFPE. There are 32 128-bit registers and the context switching is currently done non-lazily. Benchmarks on real hardware are required before implementing lazy FP state saving/restoring. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> 2012-03-05 11:49:32 +00:00			`ret`
			`ENDPROC(fpsimd_load_state)`
arm64: add support for kernel mode NEON in interrupt context This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> 2014-02-24 15:26:29 +01:00
			`#ifdef CONFIG_KERNEL_MODE_NEON`

			`/*`
			`* Save the bottom n FP registers.`
			`*`
			`* x0 - pointer to struct fpsimd_partial_state`
			`*/`
			`ENTRY(fpsimd_save_partial_state)`
			`fpsimd_save_partial x0, 1, 8, 9`
			`ret`
arm64: fpsimd: fix a typo in fpsimd_save_partial_state ENDPROC Commit 190f1ca85d07 ("arm64: add support for kernel mode NEON in interrupt context") introduced a typing error in fpsimd_save_partial_state ENDPROC. This patch fixes the typing error. Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: byungchul.park <byungchul.park@lge.com> Signed-off-by: Will Deacon <will.deacon@arm.com> 2014-07-31 11:05:36 +01:00			`ENDPROC(fpsimd_save_partial_state)`
arm64: add support for kernel mode NEON in interrupt context This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> 2014-02-24 15:26:29 +01:00
			`/*`
			`* Load the bottom n FP registers.`
			`*`
			`* x0 - pointer to struct fpsimd_partial_state`
			`*/`
			`ENTRY(fpsimd_load_partial_state)`
			`fpsimd_restore_partial x0, 8, 9`
			`ret`
			`ENDPROC(fpsimd_load_partial_state)`

			`#endif`