This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / kernel / idle_power4.S

diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S
new file mode 100644 (file)
index 0000000..d85c7c9
--- /dev/null
+++ b/arch/powerpc/kernel/idle_power4.S
@@ -0,0 +1,50 @@
+/*
+ *  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/config.h>
+#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
+