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authorVojtech Pavlik <vojtech@suse.cz>2006-09-26 04:52:28 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 04:52:28 -0400
commitc08c820508233b424deab3302bc404bbecc6493a (patch)
treed6ed79fb2d03513f6c71fc7e47705c4a19512f53 /include/asm-x86_64/smp.h
parenta670fad0adb1cc6202a607d250f10bd380593905 (diff)
[PATCH] Add the vgetcpu vsyscall
This patch adds a vgetcpu vsyscall, which depending on the CPU RDTSCP capability uses either the RDTSCP or CPUID to obtain a CPU and node numbers and pass them to the program. AK: Lots of changes over Vojtech's original code: Better prototype for vgetcpu() It's better to pass the cpu / node numbers as separate arguments to avoid mistakes when going from SMP to NUMA. Also add a fast time stamp based cache using a user supplied argument to speed things more up. Use fast method from Chuck Ebbert to retrieve node/cpu from GDT limit instead of CPUID Made sure RDTSCP init is always executed after node is known. Drop printk Signed-off-by: Vojtech Pavlik <vojtech@suse.cz> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/smp.h')
-rw-r--r--include/asm-x86_64/smp.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/asm-x86_64/smp.h b/include/asm-x86_64/smp.h
index 6805e1feb300..d61547fd833b 100644
--- a/include/asm-x86_64/smp.h
+++ b/include/asm-x86_64/smp.h
@@ -133,13 +133,19 @@ static __inline int logical_smp_processor_id(void)
133 /* we don't want to mark this access volatile - bad code generation */ 133 /* we don't want to mark this access volatile - bad code generation */
134 return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR)); 134 return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
135} 135}
136#endif
137 136
138#ifdef CONFIG_SMP 137#ifdef CONFIG_SMP
139#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu] 138#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu]
140#else 139#else
141#define cpu_physical_id(cpu) boot_cpu_id 140#define cpu_physical_id(cpu) boot_cpu_id
142#endif 141static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
143 142 void *info, int retry, int wait)
143{
144 /* Disable interrupts here? */
145 func(info);
146 return 0;
147}
148#endif /* !CONFIG_SMP */
149#endif /* !__ASSEMBLY */
144#endif 150#endif
145 151