arch/sparc/lib/csum_copy_from_user.S

File Facts

System

Linux kernel

Corpus path

arch/sparc/lib/csum_copy_from_user.S

Extension

.S

Size

472 bytes

Lines

23

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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.

Dependency Surface

• csum_copy.S

Detected Declarations

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

Annotated Snippet

#define EX_LD(x)		\
98:	x;			\
	.section .fixup, "ax";	\
	.align 4;		\
99:	retl;			\
	 mov	0, %o0;		\
	.section __ex_table,"a";\
	.align 4;		\
	.word 98b, 99b;		\
	.text;			\
	.align 4;

#define FUNC_NAME		csum_and_copy_from_user
#define LOAD(type,addr,dest)	type##a [addr] %asi, dest

#include "csum_copy.S"

Annotation

• Immediate include surface: `csum_copy.S`.
• Atlas domain: Architecture Layer / arch/sparc.
• Implementation status: atlas-only.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.