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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/power/hibernate_asm.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * hibernate_asm.S:  Hibernaton support specific for sparc64.

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 *

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 * Copyright (C) 2013 Kirill V Tkhai ([email protected])

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 */

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#include <linux/linkage.h>

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#include <asm/asm-offsets.h>

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#include <asm/cpudata.h>

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#include <asm/page.h>

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ENTRY(swsusp_arch_suspend)

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	save	%sp, -128, %sp

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	save	%sp, -128, %sp

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	flushw

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	setuw	saved_context, %g3

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	/* Save window regs */

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	rdpr	%cwp, %g2

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	stx	%g2, [%g3 + SC_REG_CWP]

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	rdpr	%wstate, %g2

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	stx	%g2, [%g3 + SC_REG_WSTATE]

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	stx	%fp, [%g3 + SC_REG_FP]

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	/* Save state regs */

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	rdpr	%tick, %g2

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	stx	%g2, [%g3 + SC_REG_TICK]

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	rdpr	%pstate, %g2

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	stx	%g2, [%g3 + SC_REG_PSTATE]

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	/* Save global regs */

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	stx	%g4, [%g3 + SC_REG_G4]

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	stx	%g5, [%g3 + SC_REG_G5]

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	stx	%g6, [%g3 + SC_REG_G6]

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	call	swsusp_save

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	 nop

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	mov	%o0, %i0

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	restore

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	mov	%o0, %i0

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	ret

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	 restore

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ENTRY(swsusp_arch_resume)

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	/* Write restore_pblist to %l0 */

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	sethi	%hi(restore_pblist), %l0

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	ldx	[%l0 + %lo(restore_pblist)], %l0

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	call	__flush_tlb_all

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	 nop

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	/* Write PAGE_OFFSET to %g7 */

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	sethi	%hi(PAGE_OFFSET), %g7

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	ldx	[%g7 + %lo(PAGE_OFFSET)], %g7

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	setuw	(PAGE_SIZE-8), %g3

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	/* Use MMU Bypass */

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	rd	%asi, %g1

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	wr	%g0, ASI_PHYS_USE_EC, %asi

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	ba	fill_itlb

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	 nop

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pbe_loop:

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	cmp	%l0, %g0

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	be	restore_ctx

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	 sub	%l0, %g7, %l0

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	ldxa	[%l0    ] %asi, %l1 /* address */

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	ldxa	[%l0 + 8] %asi, %l2 /* orig_address */

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	/* phys addr */

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	sub	%l1, %g7, %l1

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	sub	%l2, %g7, %l2

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	mov	%g3, %l3 /* PAGE_SIZE-8 */

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copy_loop:

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	ldxa	[%l1 + %l3] ASI_PHYS_USE_EC, %g2

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	stxa	%g2, [%l2 + %l3] ASI_PHYS_USE_EC

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	cmp	%l3, %g0

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	bne	copy_loop

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	 sub	%l3, 8, %l3

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	/* next pbe */

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	ba	pbe_loop

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	 ldxa	[%l0 + 16] %asi, %l0

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restore_ctx:

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	setuw	saved_context, %g3

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	/* Restore window regs */

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	wrpr    %g0, 0, %canrestore

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	wrpr    %g0, 0, %otherwin

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	wrpr	%g0, 6, %cansave

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	wrpr    %g0, 0, %cleanwin

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	ldxa	[%g3 + SC_REG_CWP] %asi, %g2

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	wrpr	%g2, %cwp

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	ldxa	[%g3 + SC_REG_WSTATE] %asi, %g2

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	wrpr	%g2, %wstate

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	ldxa	[%g3 + SC_REG_FP] %asi, %fp

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	/* Restore state regs */

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	ldxa	[%g3 + SC_REG_PSTATE] %asi, %g2

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	wrpr	%g2, %pstate

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	ldxa	[%g3 + SC_REG_TICK] %asi, %g2

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	wrpr	%g2, %tick

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	/* Restore global regs */

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	ldxa	[%g3 + SC_REG_G4] %asi, %g4

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	ldxa	[%g3 + SC_REG_G5] %asi, %g5

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	ldxa	[%g3 + SC_REG_G6] %asi, %g6

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	wr	%g1, %g0, %asi

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	restore

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	restore

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	wrpr	%g0, 14, %pil

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	retl

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	 mov	%g0, %o0

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fill_itlb:

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	ba	pbe_loop

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	 wrpr	%g0, 15, %pil

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