arch/powerpc/lib/mem_64.S

Source file repositories/reference/linux-study-clean/arch/powerpc/lib/mem_64.S

File Facts

System
Linux kernel
Corpus path
arch/powerpc/lib/mem_64.S
Extension
.S
Size
2260 bytes
Lines
143
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/export.h>
#include <asm/processor.h>
#include <asm/errno.h>
#include <asm/ppc_asm.h>
#include <asm/kasan.h>

#ifndef CONFIG_KASAN
_GLOBAL(__memset16)
	rlwimi	r4,r4,16,0,15
	/* fall through */

_GLOBAL(__memset32)
	rldimi	r4,r4,32,0
	/* fall through */

_GLOBAL(__memset64)
	neg	r0,r3
	andi.	r0,r0,7
	cmplw	cr1,r5,r0
	b	.Lms
EXPORT_SYMBOL(__memset16)
EXPORT_SYMBOL(__memset32)
EXPORT_SYMBOL(__memset64)
#endif

_GLOBAL_KASAN(memset)
	neg	r0,r3
	rlwimi	r4,r4,8,16,23
	andi.	r0,r0,7			/* # bytes to be 8-byte aligned */
	rlwimi	r4,r4,16,0,15
	cmplw	cr1,r5,r0		/* do we get that far? */
	rldimi	r4,r4,32,0
.Lms:	PPC_MTOCRF(1,r0)
	mr	r6,r3
	blt	cr1,8f
	beq	3f			/* if already 8-byte aligned */
	subf	r5,r0,r5
	bf	31,1f
	stb	r4,0(r6)
	addi	r6,r6,1
1:	bf	30,2f
	sth	r4,0(r6)
	addi	r6,r6,2
2:	bf	29,3f
	stw	r4,0(r6)
	addi	r6,r6,4
3:	srdi.	r0,r5,6
	clrldi	r5,r5,58
	mtctr	r0
	beq	5f
	.balign 16
4:	std	r4,0(r6)
	std	r4,8(r6)
	std	r4,16(r6)
	std	r4,24(r6)
	std	r4,32(r6)
	std	r4,40(r6)
	std	r4,48(r6)
	std	r4,56(r6)
	addi	r6,r6,64
	bdnz	4b
5:	srwi.	r0,r5,3
	clrlwi	r5,r5,29
	PPC_MTOCRF(1,r0)
	beq	8f
	bf	29,6f
	std	r4,0(r6)
	std	r4,8(r6)
	std	r4,16(r6)
	std	r4,24(r6)

Annotation

Implementation Notes