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| author | kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk> | 2006-04-21 17:35:15 +0100 |
|---|---|---|
| committer | kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk> | 2006-04-21 17:35:15 +0100 |
| commit | ea608cc36d26fb5b100630b98cbe28555dad8434 (patch) | |
| tree | 61f68ff13710ba157d8216da7739bc3a1a387b57 /xen/include/asm-x86/percpu.h | |
| parent | dadf394db4b56349c0aea6f72e406e5d3e2e80ac (diff) | |
| download | xen-ea608cc36d26fb5b100630b98cbe28555dad8434.tar.gz xen-ea608cc36d26fb5b100630b98cbe28555dad8434.tar.bz2 xen-ea608cc36d26fb5b100630b98cbe28555dad8434.zip | |
Pull the Linux percpu interface into Xen. Implemented for
x86 and used it to eliminate the percpu_ctxt struct from
arch/x86/domain.c.
Signed-off-by: Keir Fraser <keir@xensource.com>
Diffstat (limited to 'xen/include/asm-x86/percpu.h')
| -rw-r--r-- | xen/include/asm-x86/percpu.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/xen/include/asm-x86/percpu.h b/xen/include/asm-x86/percpu.h new file mode 100644 index 0000000000..d76206587f --- /dev/null +++ b/xen/include/asm-x86/percpu.h @@ -0,0 +1,20 @@ +#ifndef __X86_PERCPU_H__ +#define __X86_PERCPU_H__ + +#define PERCPU_SHIFT 12 +#define PERCPU_SIZE (1UL << PERCPU_SHIFT) + +/* Separate out the type, so (int[3], foo) works. */ +#define DEFINE_PER_CPU(type, name) \ + __attribute__((__section__(".data.percpu"))) \ + __typeof__(type) per_cpu__##name + +/* var is in discarded region: offset to particular copy we want */ +#define per_cpu(var, cpu) \ + (*RELOC_HIDE(&per_cpu__##var, ((unsigned int)(cpu))<<PERCPU_SHIFT)) +#define __get_cpu_var(var) \ + (per_cpu(var, smp_processor_id())) + +#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name + +#endif /* __X86_PERCPU_H__ */ |