arch/m68k/lib/memmove.c

File Facts

System

Linux kernel

Corpus path

arch/m68k/lib/memmove.c

Extension

.c

Size

2198 bytes

Lines

122

Domain

Architecture Layer

Bucket

arch/m68k

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/module.h
• linux/string.h

Detected Declarations

• export memmove

Annotated Snippet

if ((long)dest & 1) {
			char *cdest = dest;
			const char *csrc = src;
			*cdest++ = *csrc++;
			dest = cdest;
			src = csrc;
			n--;
		}
#if defined(CONFIG_M68000)
		if ((long)src & 1) {
			char *cdest = dest;
			const char *csrc = src;
			for (; n; n--)
				*cdest++ = *csrc++;
			return xdest;
		}
#endif
		if (n > 2 && (long)dest & 2) {
			short *sdest = dest;
			const short *ssrc = src;
			*sdest++ = *ssrc++;
			dest = sdest;
			src = ssrc;
			n -= 2;
		}
		temp = n >> 2;
		if (temp) {
			long *ldest = dest;
			const long *lsrc = src;
			temp--;
			do
				*ldest++ = *lsrc++;
			while (temp--);
			dest = ldest;
			src = lsrc;
		}
		if (n & 2) {
			short *sdest = dest;
			const short *ssrc = src;
			*sdest++ = *ssrc++;
			dest = sdest;
			src = ssrc;
		}
		if (n & 1) {
			char *cdest = dest;
			const char *csrc = src;
			*cdest = *csrc;
		}
	} else {
		dest = (char *)dest + n;
		src = (const char *)src + n;
		if ((long)dest & 1) {
			char *cdest = dest;
			const char *csrc = src;
			*--cdest = *--csrc;
			dest = cdest;
			src = csrc;
			n--;
		}
#if defined(CONFIG_M68000)
		if ((long)src & 1) {
			char *cdest = dest;
			const char *csrc = src;
			for (; n; n--)
				*--cdest = *--csrc;
			return xdest;
		}
#endif
		if (n > 2 && (long)dest & 2) {
			short *sdest = dest;
			const short *ssrc = src;
			*--sdest = *--ssrc;
			dest = sdest;
			src = ssrc;
			n -= 2;
		}
		temp = n >> 2;
		if (temp) {
			long *ldest = dest;
			const long *lsrc = src;
			temp--;
			do
				*--ldest = *--lsrc;
			while (temp--);
			dest = ldest;
			src = lsrc;
		}
		if (n & 2) {
			short *sdest = dest;
			const short *ssrc = src;

Annotation

• Immediate include surface: `linux/module.h`, `linux/string.h`.
• Detected declarations: `export memmove`.
• Atlas domain: Architecture Layer / arch/m68k.
• 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.