mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 16:16:42 +07:00
6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
50 lines
1.1 KiB
ArmAsm
50 lines
1.1 KiB
ArmAsm
/*
|
|
* This file contains the power_save function for 970-family CPUs.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/threads.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/page.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/ppc_asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#undef DEBUG
|
|
|
|
.text
|
|
|
|
_GLOBAL(power4_idle)
|
|
BEGIN_FTR_SECTION
|
|
blr
|
|
END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
|
|
/* Now check if user or arch enabled NAP mode */
|
|
LOAD_REG_ADDRBASE(r3,powersave_nap)
|
|
lwz r4,ADDROFF(powersave_nap)(r3)
|
|
cmpwi 0,r4,0
|
|
beqlr
|
|
|
|
/* Go to NAP now */
|
|
BEGIN_FTR_SECTION
|
|
DSSALL
|
|
sync
|
|
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
|
|
clrrdi r9,r1,THREAD_SHIFT /* current thread_info */
|
|
ld r8,TI_LOCAL_FLAGS(r9) /* set napping bit */
|
|
ori r8,r8,_TLF_NAPPING /* so when we take an exception */
|
|
std r8,TI_LOCAL_FLAGS(r9) /* it will return to our caller */
|
|
mfmsr r7
|
|
ori r7,r7,MSR_EE
|
|
oris r7,r7,MSR_POW@h
|
|
1: sync
|
|
isync
|
|
mtmsrd r7
|
|
isync
|
|
b 1b
|
|
|