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-rw-r--r--arch/s390/kernel/switch_cpu64.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/s390/kernel/switch_cpu64.S b/arch/s390/kernel/switch_cpu64.S
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+/*
+ * 64-bit switch cpu code
+ *
+ * Copyright IBM Corp. 2009
+ *
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/lowcore.h>
+#include <asm/ptrace.h>
+
+# smp_switch_to_cpu switches to destination cpu and executes the passed function
+# Parameter: %r2 - function to call
+# %r3 - function parameter
+# %r4 - stack poiner
+# %r5 - current cpu
+# %r6 - destination cpu
+
+ .section .text
+ .align 4
+ .globl smp_switch_to_cpu
+smp_switch_to_cpu:
+ stmg %r6,%r15,__SF_GPRS(%r15)
+ lgr %r1,%r15
+ aghi %r15,-STACK_FRAME_OVERHEAD
+ stg %r1,__SF_BACKCHAIN(%r15)
+ larl %r1,.gprregs
+ stmg %r0,%r15,0(%r1)
+1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
+ brc 2,1b /* busy, try again */
+2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
+ brc 2,2b /* busy, try again */
+3: j 3b
+
+ .globl smp_restart_cpu
+smp_restart_cpu:
+ larl %r1,.gprregs
+ lmg %r0,%r15,0(%r1)
+1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
+ brc 10,1b /* busy, accepted (status 0), running */
+ tmll %r0,0x40 /* Test if calling CPU is stopped */
+ jz 1b
+ ltgr %r4,%r4 /* New stack ? */
+ jz 1f
+ lgr %r15,%r4
+1: basr %r14,%r2
+
+ .section .data,"aw",@progbits
+.gprregs:
+ .rept 16
+ .quad 0
+ .endr