arch/powerpc/lib/string.S

File Facts

System

Linux kernel

Corpus path

arch/powerpc/lib/string.S

Extension

.S

Size

647 bytes

Lines

44

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

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

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

• linux/export.h
• asm/ppc_asm.h
• asm/cache.h

Detected Declarations

• export strncmp
• export memchr

Annotated Snippet

#include <linux/export.h>
#include <asm/ppc_asm.h>
#include <asm/cache.h>

	.text
	
_GLOBAL(strncmp)
	PPC_LCMPI 0,r5,0
	beq-	2f
	mtctr	r5
	addi	r5,r3,-1
	addi	r4,r4,-1
	.balign IFETCH_ALIGN_BYTES
1:	lbzu	r3,1(r5)
	cmpwi	1,r3,0
	lbzu	r0,1(r4)
	subf.	r3,r0,r3
	beqlr	1
	bdnzt	eq,1b
	blr
2:	li	r3,0
	blr
EXPORT_SYMBOL(strncmp)

_GLOBAL(memchr)
	PPC_LCMPI 0,r5,0
	beq-	2f
	mtctr	r5
	addi	r3,r3,-1
	.balign IFETCH_ALIGN_BYTES
1:	lbzu	r0,1(r3)
	cmpw	0,r0,r4
	bdnzf	2,1b
	beqlr
2:	li	r3,0
	blr
EXPORT_SYMBOL(memchr)

Annotation

• Immediate include surface: `linux/export.h`, `asm/ppc_asm.h`, `asm/cache.h`.
• Detected declarations: `export strncmp`, `export memchr`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: integration implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.