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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arc/include/asm/dsp-impl.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com)

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 *

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 * Author: Eugeniy Paltsev <[email protected]>

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 */

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#ifndef __ASM_ARC_DSP_IMPL_H

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#define __ASM_ARC_DSP_IMPL_H

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#include <asm/dsp.h>

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#define DSP_CTRL_DISABLED_ALL		0

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#ifdef __ASSEMBLER__

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/* clobbers r5 register */

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.macro DSP_EARLY_INIT

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#ifdef CONFIG_ISA_ARCV2

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	lr	r5, [ARC_AUX_DSP_BUILD]

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	bmsk	r5, r5, 7

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	breq    r5, 0, 1f

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	mov	r5, DSP_CTRL_DISABLED_ALL

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	sr	r5, [ARC_AUX_DSP_CTRL]

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1:

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#endif

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.endm

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/* clobbers r10, r11 registers pair */

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.macro DSP_SAVE_REGFILE_IRQ

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#if defined(CONFIG_ARC_DSP_KERNEL)

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	/*

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	 * Drop any changes to DSP_CTRL made by userspace so userspace won't be

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	 * able to break kernel - reset it to DSP_CTRL_DISABLED_ALL value

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	 */

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	mov	r10, DSP_CTRL_DISABLED_ALL

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	sr	r10, [ARC_AUX_DSP_CTRL]

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#elif defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)

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	/*

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	 * Save DSP_CTRL register and reset it to value suitable for kernel

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	 * (DSP_CTRL_DISABLED_ALL)

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	 */

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	mov	r10, DSP_CTRL_DISABLED_ALL

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	aex	r10, [ARC_AUX_DSP_CTRL]

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	st	r10, [sp, PT_DSP_CTRL]

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#endif

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.endm

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/* clobbers r10, r11 registers pair */

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.macro DSP_RESTORE_REGFILE_IRQ

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#if defined(CONFIG_ARC_DSP_SAVE_RESTORE_REGS)

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	ld	r10, [sp, PT_DSP_CTRL]

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	sr	r10, [ARC_AUX_DSP_CTRL]

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#endif

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.endm

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#else /* __ASEMBLY__ */

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#include <linux/sched.h>

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#include <asm/asserts.h>

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#include <asm/switch_to.h>

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#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS

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/*

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 * As we save new and restore old AUX register value in the same place we

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 * can optimize a bit and use AEX instruction (swap contents of an auxiliary

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 * register with a core register) instead of LR + SR pair.

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 */

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#define AUX_SAVE_RESTORE(_saveto, _readfrom, _offt, _aux)		\

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do {									\

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	long unsigned int _scratch;					\

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									\

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	__asm__ __volatile__(						\

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		"ld	%0, [%2, %4]			\n"		\

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		"aex	%0, [%3]			\n"		\

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		"st	%0, [%1, %4]			\n"		\

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		:							\

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		  "=&r" (_scratch)	/* must be early clobber */	\

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		:							\

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		   "r" (_saveto),					\

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		   "r" (_readfrom),					\

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		   "Ir" (_aux),						\

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		   "Ir" (_offt)						\

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		:							\

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		  "memory"						\

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	);								\

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} while (0)

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#define DSP_AUX_SAVE_RESTORE(_saveto, _readfrom, _aux)			\

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	AUX_SAVE_RESTORE(_saveto, _readfrom,				\

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		offsetof(struct dsp_callee_regs, _aux),			\

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		ARC_AUX_##_aux)

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static inline void dsp_save_restore(struct task_struct *prev,

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					struct task_struct *next)

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{

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	long unsigned int *saveto = &prev->thread.dsp.ACC0_GLO;

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	long unsigned int *readfrom = &next->thread.dsp.ACC0_GLO;

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GLO);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, ACC0_GHI);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_BFLY0);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, DSP_FFT_CTRL);

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#ifdef CONFIG_ARC_DSP_AGU_USERSPACE

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP0);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP1);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP2);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_AP3);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS0);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_OS1);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD0);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD1);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD2);

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	DSP_AUX_SAVE_RESTORE(saveto, readfrom, AGU_MOD3);

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#endif /* CONFIG_ARC_DSP_AGU_USERSPACE */

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}

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#else /* !CONFIG_ARC_DSP_SAVE_RESTORE_REGS */

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#define dsp_save_restore(p, n)

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#endif /* CONFIG_ARC_DSP_SAVE_RESTORE_REGS */

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static inline bool dsp_exist(void)

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{

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	struct bcr_generic bcr;

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	READ_BCR(ARC_AUX_DSP_BUILD, bcr);

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	return !!bcr.ver;

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}

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static inline bool agu_exist(void)

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{

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	struct bcr_generic bcr;

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	READ_BCR(ARC_AUX_AGU_BUILD, bcr);

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	return !!bcr.ver;

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}

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static inline void dsp_config_check(void)

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{

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	CHK_OPT_STRICT(CONFIG_ARC_DSP_HANDLED, dsp_exist());

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	CHK_OPT_WEAK(CONFIG_ARC_DSP_AGU_USERSPACE, agu_exist());

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}

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#endif /* __ASEMBLY__ */

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#endif /* __ASM_ARC_DSP_IMPL_H */

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