arch/sparc/lib/NG4patch.S

Source file repositories/reference/linux-study-clean/arch/sparc/lib/NG4patch.S

File Facts

System
Linux kernel
Corpus path
arch/sparc/lib/NG4patch.S
Extension
.S
Size
1664 bytes
Lines
65
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: arch/sparc
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/linkage.h>

#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	niagara4_patch_copyops
	.type	niagara4_patch_copyops,#function
niagara4_patch_copyops:
	NG_DO_PATCH(memcpy, NG4memcpy)
	NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)
	NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)
	retl
	 nop
	.size	niagara4_patch_copyops,.-niagara4_patch_copyops

	.globl	niagara4_patch_bzero
	.type	niagara4_patch_bzero,#function
niagara4_patch_bzero:
	NG_DO_PATCH(memset, NG4memset)
	NG_DO_PATCH(__bzero, NG4bzero)
	NG_DO_PATCH(__clear_user, NGclear_user)
	NG_DO_PATCH(tsb_init, NGtsb_init)
	retl
	 nop
	.size	niagara4_patch_bzero,.-niagara4_patch_bzero

	.globl	niagara4_patch_pageops
	.type	niagara4_patch_pageops,#function
niagara4_patch_pageops:
	NG_DO_PATCH(copy_user_page, NG4copy_user_page)
	NG_DO_PATCH(_clear_page, NG4clear_page)
	NG_DO_PATCH(clear_user_page, NG4clear_user_page)
	retl
	 nop
	.size	niagara4_patch_pageops,.-niagara4_patch_pageops

ENTRY(niagara4_patch_fls)
	NG_DO_PATCH(fls, NG4fls)
	NG_DO_PATCH(__fls, __NG4fls)
	retl
	 nop
ENDPROC(niagara4_patch_fls)

Annotation

Implementation Notes