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

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/* GENpage.S: Generic clear and copy page.

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 *

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 * Copyright (C) 2007 ([email protected])

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 */

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#include <asm/page.h>

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	.text

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	.align	32

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GENcopy_user_page:

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	set	PAGE_SIZE, %g7

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1:	ldx	[%o1 + 0x00], %o2

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	ldx	[%o1 + 0x08], %o3

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	ldx	[%o1 + 0x10], %o4

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	ldx	[%o1 + 0x18], %o5

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	stx	%o2, [%o0 + 0x00]

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	stx	%o3, [%o0 + 0x08]

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	stx	%o4, [%o0 + 0x10]

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	stx	%o5, [%o0 + 0x18]

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	ldx	[%o1 + 0x20], %o2

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	ldx	[%o1 + 0x28], %o3

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	ldx	[%o1 + 0x30], %o4

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	ldx	[%o1 + 0x38], %o5

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	stx	%o2, [%o0 + 0x20]

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	stx	%o3, [%o0 + 0x28]

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	stx	%o4, [%o0 + 0x30]

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	stx	%o5, [%o0 + 0x38]

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	subcc	%g7, 64, %g7

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	add	%o1, 64, %o1

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	bne,pt	%xcc, 1b

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	 add	%o0, 64, %o0

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	retl

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	 nop

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GENclear_page:

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GENclear_user_page:

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	set	PAGE_SIZE, %g7

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1:	stx	%g0, [%o0 + 0x00]

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	stx	%g0, [%o0 + 0x08]

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	stx	%g0, [%o0 + 0x10]

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	stx	%g0, [%o0 + 0x18]

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	stx	%g0, [%o0 + 0x20]

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	stx	%g0, [%o0 + 0x28]

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	stx	%g0, [%o0 + 0x30]

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	stx	%g0, [%o0 + 0x38]

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	subcc	%g7, 64, %g7

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	bne,pt	%xcc, 1b

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	 add	%o0, 64, %o0

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#define BRANCH_ALWAYS	0x10680000

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#define NOP		0x01000000

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#define GEN_DO_PATCH(OLD, NEW)	\

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	sethi	%hi(NEW), %g1; \

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	or	%g1, %lo(NEW), %g1; \

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	sethi	%hi(OLD), %g2; \

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	or	%g2, %lo(OLD), %g2; \

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	sub	%g1, %g2, %g1; \

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	sethi	%hi(BRANCH_ALWAYS), %g3; \

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	sll	%g1, 11, %g1; \

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	srl	%g1, 11 + 2, %g1; \

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	or	%g3, %lo(BRANCH_ALWAYS), %g3; \

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	or	%g3, %g1, %g3; \

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	stw	%g3, [%g2]; \

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	sethi	%hi(NOP), %g3; \

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	or	%g3, %lo(NOP), %g3; \

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	stw	%g3, [%g2 + 0x4]; \

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	flush	%g2;

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	.globl	generic_patch_pageops

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	.type	generic_patch_pageops,#function

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generic_patch_pageops:

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	GEN_DO_PATCH(copy_user_page, GENcopy_user_page)

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	GEN_DO_PATCH(_clear_page, GENclear_page)

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	GEN_DO_PATCH(clear_user_page, GENclear_user_page)

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	retl

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	 nop

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	.size	generic_patch_pageops,.-generic_patch_pageops

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