70093f7875
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1616 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
27 lines
662 B
C
27 lines
662 B
C
#include <stdint.h>
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#include <delay.h>
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#include <cpu/p6/msr.h>
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#include <cpu/p6/apic.h>
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void init_timer(void)
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{
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/* Set the apic timer to no interrupts and periodic mode */
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apic_write(APIC_LVTT, (1 << 17)|(1<< 16)|(0 << 12)|(0 << 0));
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/* Set the divider to 1, no divider */
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apic_write(APIC_TDCR, APIC_TDR_DIV_1);
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/* Set the initial counter to 0xffffffff */
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apic_write(APIC_TMICT, 0xffffffff);
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}
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void udelay(unsigned usecs)
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{
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uint32_t start, value, ticks;
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/* Calculate the number of ticks to run, our FSB runs a 200Mhz */
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ticks = usecs * 200;
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start = apic_read(APIC_TMCCT);
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do {
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value = apic_read(APIC_TMCCT);
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} while((start - value) < ticks);
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}
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