From ac2ec34fd28dad54269774b3881bc7aebfb40229 Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Tue, 10 Jul 2012 15:19:23 -0700 Subject: Re-initialize Local APIC timer on APs In order to be able to use udelay in code running on AP cores the timer has to be initialized on the according local APICs or the system will just hang when udelay is used. Change-Id: I776bc96aa6d876ff2582d0c05cbc9c7611cb06b5 Signed-off-by: Stefan Reinauer Reviewed-on: http://review.coreboot.org/1267 Tested-by: build bot (Jenkins) Reviewed-by: Sven Schnelle --- src/cpu/x86/lapic/apic_timer.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'src/cpu/x86') diff --git a/src/cpu/x86/lapic/apic_timer.c b/src/cpu/x86/lapic/apic_timer.c index a4106d40f3..1fd0c60234 100644 --- a/src/cpu/x86/lapic/apic_timer.c +++ b/src/cpu/x86/lapic/apic_timer.c @@ -79,7 +79,9 @@ void udelay(u32 usecs) { u32 start, value, ticks; - if (!timer_fsb) + if (!timer_fsb || (lapic_read(LAPIC_LVTT) & + (LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) != + (LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) init_timer(); /* Calculate the number of ticks to run, our FSB runs at timer_fsb Mhz */ -- cgit v1.2.3