diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/speedstep/acpi.c | 31 |
1 files changed, 7 insertions, 24 deletions
diff --git a/src/cpu/intel/speedstep/acpi.c b/src/cpu/intel/speedstep/acpi.c index 5cff4125ae..7111f5efd5 100644 --- a/src/cpu/intel/speedstep/acpi.c +++ b/src/cpu/intel/speedstep/acpi.c @@ -21,6 +21,7 @@ #include <arch/acpigen.h> #include <arch/cpu.h> #include <cpu/x86/msr.h> +#include <cpu/intel/fsb.h> #include <cpu/intel/speedstep.h> #include <device/device.h> @@ -40,29 +41,6 @@ static int determine_total_number_of_cores(void) return count; } -/** - * @brief Returns three times the FSB clock in MHz - * - * The result of calculations with the returned value shall be divided by 3. - * This helps to avoid rounding errors. - */ -static int get_fsb(void) -{ - const u32 fsbcode = rdmsr(MSR_FSB_FREQ).lo & 7; - switch (fsbcode) { - case 0: return 800; /* / 3 == 266 */ - case 1: return 400; /* / 3 == 133 */ - case 2: return 600; /* / 3 == 200 */ - case 3: return 500; /* / 3 == 166 */ - case 4: return 1000; /* / 3 == 333 */ - case 5: return 300; /* / 3 == 100 */ - case 6: return 1200; /* / 3 == 400 */ - } - printk(BIOS_WARNING, - "Warning: No supported FSB frequency. Assuming 200MHz\n"); - return 600; -} - static void gen_pstate_entries(const sst_table_t *const pstates, const int cpuID, const int cores_per_package, const uint8_t coordination) @@ -75,7 +53,12 @@ static void gen_pstate_entries(const sst_table_t *const pstates, cpuID, cores_per_package, coordination); acpigen_write_name("_PSS"); - const int fsb3 = get_fsb(); + int fsb3 = get_ia32_fsb_x3(); + if (fsb3 <= 0) { + printk(BIOS_ERR, "CPU or FSB not supported. Assuming 200MHz\n"); + fsb3 = 600; + } + const int min_ratio2 = SPEEDSTEP_DOUBLE_RATIO( pstates->states[pstates->num_states - 1]); const int max_ratio2 = SPEEDSTEP_DOUBLE_RATIO(pstates->states[0]); |