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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/lib/NG4patch.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.

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 *

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 * Copyright (C) 2012 David S. Miller <[email protected]>

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 */

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#include <linux/linkage.h>

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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	niagara4_patch_copyops

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	.type	niagara4_patch_copyops,#function

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niagara4_patch_copyops:

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	NG_DO_PATCH(memcpy, NG4memcpy)

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	NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)

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	NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)

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	retl

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	 nop

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	.size	niagara4_patch_copyops,.-niagara4_patch_copyops

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	.globl	niagara4_patch_bzero

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	.type	niagara4_patch_bzero,#function

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niagara4_patch_bzero:

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	NG_DO_PATCH(memset, NG4memset)

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	NG_DO_PATCH(__bzero, NG4bzero)

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	NG_DO_PATCH(__clear_user, NGclear_user)

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	NG_DO_PATCH(tsb_init, NGtsb_init)

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	retl

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	 nop

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	.size	niagara4_patch_bzero,.-niagara4_patch_bzero

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	.globl	niagara4_patch_pageops

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	.type	niagara4_patch_pageops,#function

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niagara4_patch_pageops:

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	NG_DO_PATCH(copy_user_page, NG4copy_user_page)

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	NG_DO_PATCH(_clear_page, NG4clear_page)

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	NG_DO_PATCH(clear_user_page, NG4clear_user_page)

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	retl

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	 nop

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	.size	niagara4_patch_pageops,.-niagara4_patch_pageops

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ENTRY(niagara4_patch_fls)

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	NG_DO_PATCH(fls, NG4fls)

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	NG_DO_PATCH(__fls, __NG4fls)

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	retl

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	 nop

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ENDPROC(niagara4_patch_fls)

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