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-rw-r--r--arch/powerpc/kernel/idle_power4.S73
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S
new file mode 100644
index 000000000..f57a19348
--- /dev/null
+++ b/arch/powerpc/kernel/idle_power4.S
@@ -0,0 +1,73 @@
+/*
+ * 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
+