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| author | David S. Miller <davem@davemloft.net> | 2010-03-01 04:23:06 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-01 04:23:06 +0100 |
| commit | 47871889c601d8199c51a4086f77eebd77c29b0b (patch) | |
| tree | 40cdcac3bff0ee40cc33dcca61d0577cdf965f77 /arch/s390/kernel/switch_cpu.S | |
| parent | bnx2x: Tx barriers and locks (diff) | |
| parent | Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
| download | linux-47871889c601d8199c51a4086f77eebd77c29b0b.tar.xz linux-47871889c601d8199c51a4086f77eebd77c29b0b.zip | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Conflicts:
drivers/firmware/iscsi_ibft.c
Diffstat (limited to 'arch/s390/kernel/switch_cpu.S')
| -rw-r--r-- | arch/s390/kernel/switch_cpu.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/s390/kernel/switch_cpu.S b/arch/s390/kernel/switch_cpu.S new file mode 100644 index 000000000000..469f11b574fa --- /dev/null +++ b/arch/s390/kernel/switch_cpu.S @@ -0,0 +1,58 @@ +/* + * 31-bit switch cpu code + * + * Copyright IBM Corp. 2009 + * + */ + +#include <asm/asm-offsets.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: + stm %r6,%r15,__SF_GPRS(%r15) + lr %r1,%r15 + ahi %r15,-STACK_FRAME_OVERHEAD + st %r1,__SF_BACKCHAIN(%r15) + basr %r13,0 +0: la %r1,.gprregs_addr-0b(%r13) + l %r1,0(%r1) + stm %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: + basr %r13,0 +0: la %r1,.gprregs_addr-0b(%r13) + l %r1,0(%r1) + lm %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 + ltr %r4,%r4 /* New stack ? */ + jz 1f + lr %r15,%r4 +1: basr %r14,%r2 + +.gprregs_addr: + .long .gprregs + + .section .data,"aw",@progbits +.gprregs: + .rept 16 + .long 0 + .endr |