Commit e95ade08 authored by David S. Miller's avatar David S. Miller
Browse files

sparc: Minor tweaks to Niagara page copy/clear. 



Don't use floating point on Niagara2, use the traditional
plain Niagara code instead.

Unroll Niagara loops to 128 bytes for copy, and 256 bytes
for clear.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ac85fe8b

arch/sparc/kernel/head_64.S

+1 −1
Original line number Diff line number Diff line
@@ -559,7 +559,7 @@ niagara2_patch: 
	 nop

	call	niagara_patch_bzero

	 nop

	call	niagara2_patch_pageops

	call	niagara_patch_pageops

	 nop



	ba,a,pt	%xcc, 80f

arch/sparc/lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ lib-$(CONFIG_SPARC64) += NGmemcpy.o NGcopy_from_user.o NGcopy_to_user.o 
lib-$(CONFIG_SPARC64) += NGpatch.o NGpage.o NGbzero.o



lib-$(CONFIG_SPARC64) += NG2memcpy.o NG2copy_from_user.o NG2copy_to_user.o

lib-$(CONFIG_SPARC64) +=  NG2patch.o NG2page.o

lib-$(CONFIG_SPARC64) +=  NG2patch.o



lib-$(CONFIG_SPARC64) += GENmemcpy.o GENcopy_from_user.o GENcopy_to_user.o

lib-$(CONFIG_SPARC64) += GENpatch.o GENpage.o GENbzero.o

arch/sparc/lib/NG2page.S

deleted100644 → 0
+0 −61
Original line number Diff line number Diff line 
/* NG2page.S: Niagara-2 optimized clear and copy page.

 *

 * Copyright (C) 2007 (davem@davemloft.net)

 */



#include <asm/asi.h>

#include <asm/page.h>

#include <asm/visasm.h>



	.text

	.align	32



	/* This is heavily simplified from the sun4u variants

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

	 */

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

	prefetch	[%o1 + 0x00], #one_read

	prefetch	[%o1 + 0x40], #one_read

	VISEntryHalf

	set		PAGE_SIZE, %g7

	sub		%o0, %o1, %g3

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

	subcc		%g7, 64, %g7

	ldda		[%o1] ASI_BLK_P, %f0

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

	add		%o1, 64, %o1

	bne,pt		%xcc, 1b

	 prefetch	[%o1 + 0x40], #one_read

	membar		#Sync

	VISExitHalf

	retl

	 nop



#define BRANCH_ALWAYS	0x10680000

#define NOP		0x01000000

#define NG_DO_PATCH(OLD, NEW)	\

	sethi	%hi(NEW), %g1; \

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

	sethi	%hi(OLD), %g2; \

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

	sub	%g1, %g2, %g1; \

	sethi	%hi(BRANCH_ALWAYS), %g3; \

	sll	%g1, 11, %g1; \

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

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

	or	%g3, %g1, %g3; \

	stw	%g3, [%g2]; \

	sethi	%hi(NOP), %g3; \

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

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

	flush	%g2;



	.globl	niagara2_patch_pageops

	.type	niagara2_patch_pageops,#function

niagara2_patch_pageops:

	NG_DO_PATCH(copy_user_page, NG2copy_user_page)

	NG_DO_PATCH(_clear_page, NGclear_page)

	NG_DO_PATCH(clear_user_page, NGclear_user_page)

	retl

	 nop

	.size	niagara2_patch_pageops,.-niagara2_patch_pageops

arch/sparc/lib/NGpage.S

+75 −39
Original line number Diff line number Diff line
@@ -16,55 +16,91 @@ 
	 */



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

	prefetch	[%o1 + 0x00], #one_read

	mov		8, %g1

	mov		16, %g2

	mov		24, %g3

	save		%sp, -192, %sp

	rd		%asi, %g3

	wr		%g0, ASI_BLK_INIT_QUAD_LDD_P, %asi

	set		PAGE_SIZE, %g7

	prefetch	[%i1 + 0x00], #one_read

	prefetch	[%i1 + 0x40], #one_read



1:	ldda		[%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2

	ldda		[%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4

	prefetch	[%o1 + 0x40], #one_read

	add		%o1, 32, %o1

	stxa		%o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P

	ldda		[%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2

	stxa		%o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P

	ldda		[%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4

	add		%o1, 32, %o1

	add		%o0, 32, %o0

	stxa		%o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P

	subcc		%g7, 64, %g7

1:	prefetch	[%i1 + 0x80], #one_read

	prefetch	[%i1 + 0xc0], #one_read

	ldda		[%i1 + 0x00] %asi, %o2

	ldda		[%i1 + 0x10] %asi, %o4

	ldda		[%i1 + 0x20] %asi, %l2

	ldda		[%i1 + 0x30] %asi, %l4

	stxa		%o2, [%i0 + 0x00] %asi

	stxa		%o3, [%i0 + 0x08] %asi

	stxa		%o4, [%i0 + 0x10] %asi

	stxa		%o5, [%i0 + 0x18] %asi

	stxa		%l2, [%i0 + 0x20] %asi

	stxa		%l3, [%i0 + 0x28] %asi

	stxa		%l4, [%i0 + 0x30] %asi

	stxa		%l5, [%i0 + 0x38] %asi

	ldda		[%i1 + 0x40] %asi, %o2

	ldda		[%i1 + 0x50] %asi, %o4

	ldda		[%i1 + 0x60] %asi, %l2

	ldda		[%i1 + 0x70] %asi, %l4

	stxa		%o2, [%i0 + 0x40] %asi

	stxa		%o3, [%i0 + 0x48] %asi

	stxa		%o4, [%i0 + 0x50] %asi

	stxa		%o5, [%i0 + 0x58] %asi

	stxa		%l2, [%i0 + 0x60] %asi

	stxa		%l3, [%i0 + 0x68] %asi

	stxa		%l4, [%i0 + 0x70] %asi

	stxa		%l5, [%i0 + 0x78] %asi

	add		%i1, 128, %i1

	subcc		%g7, 128, %g7

	bne,pt		%xcc, 1b

	 add		%o0, 32, %o0

	 add		%i0, 128, %i0

	wr		%g3, 0x0, %asi

	membar		#Sync

	retl

	 nop

	ret

	 restore



	.globl		NGclear_page, NGclear_user_page

	.align		32

NGclear_page:		/* %o0=dest */

NGclear_user_page:	/* %o0=dest, %o1=vaddr */

	mov		8, %g1

	mov		16, %g2

	mov		24, %g3

	rd		%asi, %g3

	wr		%g0, ASI_BLK_INIT_QUAD_LDD_P, %asi

	set		PAGE_SIZE, %g7



1:	stxa		%g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P

	add		%o0, 32, %o0

	stxa		%g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P

	stxa		%g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P

	subcc		%g7, 64, %g7

1:	stxa		%g0, [%o0 + 0x00] %asi

	stxa		%g0, [%o0 + 0x08] %asi

	stxa		%g0, [%o0 + 0x10] %asi

	stxa		%g0, [%o0 + 0x18] %asi

	stxa		%g0, [%o0 + 0x20] %asi

	stxa		%g0, [%o0 + 0x28] %asi

	stxa		%g0, [%o0 + 0x30] %asi

	stxa		%g0, [%o0 + 0x38] %asi

	stxa		%g0, [%o0 + 0x40] %asi

	stxa		%g0, [%o0 + 0x48] %asi

	stxa		%g0, [%o0 + 0x50] %asi

	stxa		%g0, [%o0 + 0x58] %asi

	stxa		%g0, [%o0 + 0x60] %asi

	stxa		%g0, [%o0 + 0x68] %asi

	stxa		%g0, [%o0 + 0x70] %asi

	stxa		%g0, [%o0 + 0x78] %asi

	stxa		%g0, [%o0 + 0x80] %asi

	stxa		%g0, [%o0 + 0x88] %asi

	stxa		%g0, [%o0 + 0x90] %asi

	stxa		%g0, [%o0 + 0x98] %asi

	stxa		%g0, [%o0 + 0xa0] %asi

	stxa		%g0, [%o0 + 0xa8] %asi

	stxa		%g0, [%o0 + 0xb0] %asi

	stxa		%g0, [%o0 + 0xb8] %asi

	stxa		%g0, [%o0 + 0xc0] %asi

	stxa		%g0, [%o0 + 0xc8] %asi

	stxa		%g0, [%o0 + 0xd0] %asi

	stxa		%g0, [%o0 + 0xd8] %asi

	stxa		%g0, [%o0 + 0xe0] %asi

	stxa		%g0, [%o0 + 0xe8] %asi

	stxa		%g0, [%o0 + 0xf0] %asi

	stxa		%g0, [%o0 + 0xf8] %asi

	subcc		%g7, 256, %g7

	bne,pt		%xcc, 1b

	 add		%o0, 32, %o0

	 add		%o0, 256, %o0

	wr		%g3, 0x0, %asi

	membar		#Sync

	retl

	 nop

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