diff options
Diffstat (limited to 'src/cpu/intel/model_f2x')
| -rw-r--r-- | src/cpu/intel/model_f2x/Config.lb | 9 | ||||
| -rw-r--r-- | src/cpu/intel/model_f2x/apic_timer.c | 26 |
2 files changed, 34 insertions, 1 deletions
diff --git a/src/cpu/intel/model_f2x/Config.lb b/src/cpu/intel/model_f2x/Config.lb index 508e1da172..b985ffc12d 100644 --- a/src/cpu/intel/model_f2x/Config.lb +++ b/src/cpu/intel/model_f2x/Config.lb @@ -1,4 +1,5 @@ -dir /cpu/x86/tsc +uses CONFIG_UDELAY_TSC + dir /cpu/x86/mtrr dir /cpu/x86/fpu dir /cpu/x86/mmx @@ -8,3 +9,9 @@ dir /cpu/x86/cache dir /cpu/intel/microcode dir /cpu/intel/hyperthreading driver model_f2x_init.o + +if CONFIG_UDELAY_TSC + dir /cpu/x86/tsc +else + object apic_timer.o +end diff --git a/src/cpu/intel/model_f2x/apic_timer.c b/src/cpu/intel/model_f2x/apic_timer.c new file mode 100644 index 0000000000..5a81f912c5 --- /dev/null +++ b/src/cpu/intel/model_f2x/apic_timer.c @@ -0,0 +1,26 @@ +#include <stdint.h> +#include <delay.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/lapic.h> + +void init_timer(void) +{ + /* Set the apic timer to no interrupts and periodic mode */ + lapic_write(LAPIC_LVTT, (1 << 17)|(1<< 16)|(0 << 12)|(0 << 0)); + /* Set the divider to 1, no divider */ + lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1); + /* Set the initial counter to 0xffffffff */ + lapic_write(LAPIC_TMICT, 0xffffffff); +} + +void udelay(unsigned usecs) +{ + uint32_t start, value, ticks; + /* Calculate the number of ticks to run, our FSB runs a 200Mhz */ + ticks = usecs * 200; + start = lapic_read(LAPIC_TMCCT); + do { + value = lapic_read(LAPIC_TMCCT); + } while((start - value) < ticks); + +} |