From 73dea47faeb96d54a984b9d7f4de564816966354 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Fri, 3 Feb 2006 21:50:50 +0100 Subject: [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 Signed-off-by: Linus Torvalds --- include/asm-x86_64/proto.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/asm-x86_64/proto.h') diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index d35c7e06f340..c1e2307445d4 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); -- cgit v1.2.3