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

[linux-2.6.git] / arch / avr32 / kernel / switch_to.S

diff --git a/arch/avr32/kernel/switch_to.S b/arch/avr32/kernel/switch_to.S
new file mode 100644 (file)
index 0000000..a48d046
--- /dev/null
+++ b/arch/avr32/kernel/switch_to.S
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/sysreg.h>
+
+       .text
+       .global __switch_to
+       .type   __switch_to, @function
+
+       /* Switch thread context from "prev" to "next", returning "last"
+        *   r12 :      prev
+        *   r11 :      &prev->thread + 1
+        *   r10 :      &next->thread
+        */
+__switch_to:
+       stm     --r11, r0,r1,r2,r3,r4,r5,r6,r7,sp,lr
+       mfsr    r9, SYSREG_SR
+       st.w    --r11, r9
+       ld.w    r8, r10++
+       /*
+        * schedule() may have been called from a mode with a different
+        * set of registers. Make sure we don't lose anything here.
+        */
+       pushm   r10,r12
+       mtsr    SYSREG_SR, r8
+       frs                     /* flush the return stack */
+       sub     pc, -2          /* flush the pipeline */
+       popm    r10,r12
+       ldm     r10++, r0,r1,r2,r3,r4,r5,r6,r7,sp,pc
+       .size   __switch_to, . - __switch_to