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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sparc/lib/NG2page.S
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/* NG2page.S: Niagara-2 optimized 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/asi.h>

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#include <asm/page.h>

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#include <asm/visasm.h>

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	.text

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	.align	32

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	/* This is heavily simplified from the sun4u variants

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	 * because Niagara-2 does not have any D-cache aliasing issues.

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	 */

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NG2copy_user_page:	/* %o0=dest, %o1=src, %o2=vaddr */

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	prefetch	[%o1 + 0x00], #one_read

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	prefetch	[%o1 + 0x40], #one_read

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	VISEntryHalf

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	set		PAGE_SIZE, %g7

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	sub		%o0, %o1, %g3

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1:	stxa		%g0, [%o1 + %g3] ASI_BLK_INIT_QUAD_LDD_P

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	subcc		%g7, 64, %g7

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	ldda		[%o1] ASI_BLK_P, %f0

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	stda		%f0, [%o1 + %g3] ASI_BLK_P

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	add		%o1, 64, %o1

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	bne,pt		%xcc, 1b

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	 prefetch	[%o1 + 0x40], #one_read

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	membar		#Sync

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	VISExitHalf

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	retl

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	 nop

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#define BRANCH_ALWAYS	0x10680000

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#define NOP		0x01000000

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#define NG_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	niagara2_patch_pageops

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	.type	niagara2_patch_pageops,#function

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niagara2_patch_pageops:

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	NG_DO_PATCH(copy_user_page, NG2copy_user_page)

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	NG_DO_PATCH(_clear_page, NGclear_page)

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	NG_DO_PATCH(clear_user_page, NGclear_user_page)

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	retl

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	 nop

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	.size	niagara2_patch_pageops,.-niagara2_patch_pageops

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