/* * 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 [31mCONFIG_TRACE_IRQFLAGS[0m 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 |