arch/sh/lib/div64.S

File Facts

System

Linux kernel

Corpus path

arch/sh/lib/div64.S

Extension

.S

Size

586 bytes

Lines

48

Domain

Architecture Layer

Bucket

arch/sh

Inferred role

Architecture Layer: arch/sh

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.

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

Dependency Surface

• linux/linkage.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#include <linux/linkage.h>

.text
ENTRY(__xdiv64_32)
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	mov	r4, r0
	mov	r5, r1
#else
	mov	r4, r1
	mov	r5, r0
#endif
	cmp/hs	r6, r1
	bf.s	1f
	 mov	#0, r2

	mov	r1, r2
	mov	#0, r3
	div0u
	.rept	32
	rotcl	r2
	div1	r6, r3
	.endr
	rotcl	r2
	mul.l	r6, r2
	sts	macl, r3
	sub	r3, r1
1:
	div0u
	.rept	32
	rotcl	r0
	div1	r6, r1
	.endr
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	mov	r2, r1
	rts
	 rotcl	r0
#else
	rotcl	r0
	mov	r0, r1
	rts
	 mov	r2, r0
#endif

Annotation

• Immediate include surface: `linux/linkage.h`.
• Atlas domain: Architecture Layer / arch/sh.
• Implementation status: atlas-only.

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.