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- /*
- * 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>
- #include <asm/irqflags.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
- /* Hard disable interrupts */
- mfmsr r7
- rldicl r0,r7,48,1
- rotldi r0,r0,16
- mtmsrd r0,1
- /* Check if something happened while soft-disabled */
- lbz r0,PACAIRQHAPPENED(r13)
- cmpwi cr0,r0,0
- bnelr
- /* Soft-enable interrupts */
- #ifdef CONFIG_TRACE_IRQFLAGS
- mflr r0
- std r0,16(r1)
- stdu r1,-128(r1)
- bl trace_hardirqs_on
- addi r1,r1,128
- ld r0,16(r1)
- mtlr r0
- mfmsr r7
- #endif /* CONFIG_TRACE_IRQFLAGS */
- li r0,1
- stb r0,PACASOFTIRQEN(r13) /* we'll hard-enable shortly */
- BEGIN_FTR_SECTION
- DSSALL
- sync
- END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
- CURRENT_THREAD_INFO(r9, r1)
- 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 */
- ori r7,r7,MSR_EE
- oris r7,r7,MSR_POW@h
- 1: sync
- isync
- mtmsrd r7
- isync
- b 1b
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