diff options
Diffstat (limited to 'src/cpu/intel/common/fsb.c')
| -rw-r--r-- | src/cpu/intel/common/fsb.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/src/cpu/intel/common/fsb.c b/src/cpu/intel/common/fsb.c index d66e87a396..2d86abd929 100644 --- a/src/cpu/intel/common/fsb.c +++ b/src/cpu/intel/common/fsb.c @@ -11,12 +11,16 @@ * GNU General Public License for more details. */ +#include <arch/early_variables.h> #include <cpu/cpu.h> #include <cpu/x86/msr.h> #include <cpu/intel/speedstep.h> #include <cpu/intel/fsb.h> #include <console/console.h> #include <commonlib/helpers.h> +#include <delay.h> + +static u32 g_timer_fsb CAR_GLOBAL; static int get_fsb(void) { @@ -67,16 +71,31 @@ static int get_fsb(void) return ret; } -int get_ia32_fsb(void) +static int set_timer_fsb(void) { - int ret; + int ret = get_fsb(); - ret = get_fsb(); + if (ret > 0) { + car_set_var(g_timer_fsb, ret); + return 0; + } if (ret == -1) printk(BIOS_ERR, "FSB not found\n"); if (ret == -2) printk(BIOS_ERR, "CPU not supported\n"); - return ret; + return -1; +} + +u32 get_timer_fsb(void) +{ + u32 fsb; + + fsb = car_get_var(g_timer_fsb); + if (fsb > 0) + return fsb; + + set_timer_fsb(); + return car_get_var(g_timer_fsb); } /** @@ -87,7 +106,7 @@ int get_ia32_fsb(void) */ int get_ia32_fsb_x3(void) { - const int fsb = get_ia32_fsb(); + const int fsb = get_timer_fsb(); if (fsb > 0) return 100 * DIV_ROUND_CLOSEST(3 * fsb, 100); |