arch/arm/lib/csumpartialcopy.S

Source file repositories/reference/linux-study-clean/arch/arm/lib/csumpartialcopy.S

File Facts

System
Linux kernel
Corpus path
arch/arm/lib/csumpartialcopy.S
Extension
.S
Size
979 bytes
Lines
51
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: arch/arm
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>
#include <asm/assembler.h>

		.text

/* Function: __u32 csum_partial_copy_nocheck(const char *src, char *dst, int len)
 * Params  : r0 = src, r1 = dst, r2 = len
 * Returns : r0 = new checksum
 */

		.macro	save_regs
		stmfd	sp!, {r1, r4 - r8, lr}
		.endm

		.macro	load_regs
		ldmfd	sp!, {r1, r4 - r8, pc}
		.endm

		.macro	load1b, reg1
		ldrb	\reg1, [r0], #1
		.endm

		.macro	load2b, reg1, reg2
		ldrb	\reg1, [r0], #1
		ldrb	\reg2, [r0], #1
		.endm

		.macro	load1l, reg1
		ldr	\reg1, [r0], #4
		.endm

		.macro	load2l, reg1, reg2
		ldr	\reg1, [r0], #4
		ldr	\reg2, [r0], #4
		.endm

		.macro	load4l, reg1, reg2, reg3, reg4
		ldmia	r0!, {\reg1, \reg2, \reg3, \reg4}
		.endm

#define FN_ENTRY	ENTRY(csum_partial_copy_nocheck)
#define FN_EXIT		ENDPROC(csum_partial_copy_nocheck)

#include "csumpartialcopygeneric.S"

Annotation

Implementation Notes