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

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/*

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 * Copyright (C) 2023 StarFive Technology Co., Ltd.

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 *

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 * Author: Jee Heng Sia <[email protected]>

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 */

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#ifndef __ASSEMBLY__

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#error "Only include this from assembly code"

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#endif

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#ifndef __ASM_ASSEMBLER_H

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#define __ASM_ASSEMBLER_H

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#include <asm/asm.h>

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#include <asm/asm-offsets.h>

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#include <asm/csr.h>

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/*

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 * suspend_restore_csrs - restore CSRs

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 */

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	.macro suspend_restore_csrs

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		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)

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		csrw	CSR_EPC, t0

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		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)

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		csrw	CSR_STATUS, t0

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		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)

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		csrw	CSR_TVAL, t0

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		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)

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		csrw	CSR_CAUSE, t0

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	.endm

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/*

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 * suspend_restore_regs - Restore registers (except A0 and T0-T6)

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 */

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	.macro suspend_restore_regs

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		REG_L	ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)

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		REG_L	sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)

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		REG_L	gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)

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		REG_L	tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)

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		REG_L	s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)

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		REG_L	s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)

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		REG_L	a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)

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		REG_L	a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)

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		REG_L	a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)

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		REG_L	a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)

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		REG_L	a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)

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		REG_L	a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)

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		REG_L	a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)

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		REG_L	s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)

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		REG_L	s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)

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		REG_L	s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)

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		REG_L	s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)

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		REG_L	s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)

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		REG_L	s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)

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		REG_L	s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)

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		REG_L	s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)

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		REG_L	s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)

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		REG_L	s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)

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	.endm

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/*

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 * copy_page - copy 1 page (4KB) of data from source to destination

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 * @a0 - destination

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 * @a1 - source

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 */

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	.macro	copy_page a0, a1

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		lui	a2, 0x1

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		add	a2, a2, a0

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1 :

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		REG_L	t0, 0(a1)

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		REG_L	t1, SZREG(a1)

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		REG_S	t0, 0(a0)

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		REG_S	t1, SZREG(a0)

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		addi	a0, a0, 2 * SZREG

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		addi	a1, a1, 2 * SZREG

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		bne	a2, a0, 1b

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	.endm

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#endif	/* __ASM_ASSEMBLER_H */

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