arch/powerpc/platforms/pasemi/powersave.S

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/pasemi/powersave.S

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/pasemi/powersave.S
Extension
.S
Size
1246 bytes
Lines
77
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: arch/powerpc
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 <asm/processor.h>
#include <asm/page.h>
#include <asm/ppc_asm.h>
#include <asm/cputable.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>

/* Power savings opcodes since not all binutils have them at this time */
#define DOZE	.long	0x4c000324
#define NAP	.long	0x4c000364
#define SLEEP	.long	0x4c0003a4
#define RVW	.long	0x4c0003e4

/* Common sequence to do before going to any of the
 * powersavings modes.
 */

#define PRE_SLEEP_SEQUENCE	\
	std	r3,8(r1);	\
	ptesync	;		\
	ld	r3,8(r1);	\
1:	cmpd 	r3,r3;		\
	bne	1b

_doze:
	PRE_SLEEP_SEQUENCE
	DOZE
	b	.


_GLOBAL(idle_spin)
	blr

_GLOBAL(idle_doze)
	LOAD_REG_ADDR(r3, _doze)
	b	sleep_common

/* Add more modes here later */

sleep_common:
	mflr	r0
	std	r0, 16(r1)
	stdu	r1,-64(r1)
#ifdef CONFIG_PPC_PASEMI_CPUFREQ
	std	r3, 48(r1)

	/* Only do power savings when in astate 0 */
	bl	check_astate
	cmpwi	r3,0
	bne	1f

	ld	r3, 48(r1)
#endif
	LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE)
	mfmsr	r4
	andc	r5,r4,r6
	mtmsrd	r5,0

	mtctr	r3
	bctrl

	mtmsrd	r4,0

1:	addi	r1,r1,64
	ld	r0,16(r1)
	mtlr	r0
	blr

Annotation

Implementation Notes