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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-27 16:20:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-27 16:20:17 -0800 |
| commit | 7981164791d18d5ed1dcdfa9598949ed158a5333 (patch) | |
| tree | 6565e7406dd55eb5014efd3e54109159a47cb10e /arch/s390/kernel/switch_cpu64.S | |
| parent | f1dd6ad599732fc89f36fdd65a2c2cf3c63a8711 (diff) | |
| parent | a8d6356cdabf4495aaae7d3e89eb058b1909761c (diff) | |
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (35 commits)
[S390] time: remove unused code
[S390] zcore: Add prefix registers to dump header
[S390] correct vdso version string
[S390] add support for compressed kernels
[S390] Define new s390 ELF note sections in elf.h
[S390] codepage conversion of kernel parameter line
[S390] seq_file: convert drivers/s390/
[S390] add z9-ec/z10 instruction to kernel disassembler
[S390] dasd: correct offline processing
[S390] dasd: fix refcounting.
[S390] dasd: fix online/offline race
[S390] use kprobes_built_in() in mm/fault code
[S390] bug: use relative pointers in bug table entries
[S390] Cleanup struct _lowcore usage and defines.
[S390] free_initmem: reduce code duplication
[S390] Replace ENOTSUPP usage with EOPNOTSUPP
[S390] spinlock: check virtual cpu running status
[S390] sysinfo: fix SYSIB 3,2,2 structure
[S390] add MACHINE_IS_LPAR flag
[S390] qdio: optimize cache line usage of struct qdio_irq
...
Diffstat (limited to 'arch/s390/kernel/switch_cpu64.S')
| -rw-r--r-- | arch/s390/kernel/switch_cpu64.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/s390/kernel/switch_cpu64.S b/arch/s390/kernel/switch_cpu64.S new file mode 100644 index 000000000000..d94aacc898cb --- /dev/null +++ b/arch/s390/kernel/switch_cpu64.S @@ -0,0 +1,51 @@ +/* + * 64-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: + 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 |