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authorAndi Kleen <ak@suse.de>2006-02-03 21:50:50 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-04 16:43:13 -0800
commit73dea47faeb96d54a984b9d7f4de564816966354 (patch)
tree6b1f090e9071e281367bc106c1b2ab05cb43e459 /include/asm-x86_64
parent76b461c21468f41837283b7888d55f1c0671f719 (diff)
[PATCH] x86_64: Allow to run main time keeping from the local APIC interrupt
Another piece from the no-idle-tick patch. This can be enabled with the "apicmaintimer" option. This is mainly useful when the PIT/HPET interrupt is unreliable. Note there are some systems that are known to stop the APIC timer in C3. For those it will never work, but this case should be automatically detected. It also only works with PM timer right now. When HPET is used the way the main timer handler computes the delay doesn't work. It should be a bit more efficient because there is one less regular interrupt to process on the boot processor. Requires earlier bugfix from Venkatesh Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/apic.h1
-rw-r--r--include/asm-x86_64/proto.h5
2 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h
index 4f6a4dc455b..bdbd8935612 100644
--- a/include/asm-x86_64/apic.h
+++ b/include/asm-x86_64/apic.h
@@ -17,6 +17,7 @@
#define APIC_DEBUG 2
extern int apic_verbosity;
+extern int apic_runs_main_timer;
/*
* Define the default level of output to be very little
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index d35c7e06f34..c1e2307445d 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -49,6 +49,8 @@ extern u32 pmtmr_ioport;
#endif
extern unsigned long long monotonic_base;
extern int sysctl_vsyscall;
+extern int nohpet;
+extern unsigned long vxtime_hz;
extern void do_softirq_thunk(void);
@@ -69,6 +71,9 @@ extern void free_bootmem_generic(unsigned long phys, unsigned len);
extern void load_gs_index(unsigned gs);
+extern void stop_timer_interrupt(void);
+extern void main_timer_handler(struct pt_regs *regs);
+
extern unsigned long end_pfn_map;
extern void show_trace(unsigned long * rsp);