| /* |
| * 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) |
| 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 */ |
| ori r7,r7,MSR_EE |
| oris r7,r7,MSR_POW@h |
| 1: sync |
| isync |
| mtmsrd r7 |
| isync |
| b 1b |
| |