New patch to review for coreboot: cpu/intel/speedstep/acpi.c: Add Netburst and Pentium 4 CPUs

[HAOUAS Elyes]

HAOUAS Elyes ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18019

-gerrit

commit 8e259c92247e7de72054e9feb4aaaeb783f35136
Author: Elyes HAOUAS 
Date:   Mon Jan 2 21:00:59 2017 +0100

cpu/intel/speedstep/acpi.c: Add Netburst and Pentium 4 CPUs

MSR(0x2c) provides information abour FSB frequency

Change-Id: I42b0dcfdd62e07422acb77462aefc2d9b62fba19
    Signed-off-by: Elyes HAOUAS 
---
 src/cpu/intel/speedstep/acpi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/cpu/intel/speedstep/acpi.c b/src/cpu/intel/speedstep/acpi.c
index d85e487..fb06cb6 100644
--- a/src/cpu/intel/speedstep/acpi.c
+++ b/src/cpu/intel/speedstep/acpi.c
@@ -49,7 +49,17 @@ static int determine_total_number_of_cores(void)
  */
 static int get_fsb(void)
 {
-	const u32 fsbcode = rdmsr(MSR_FSB_FREQ).lo & 7;
+	const u32 fsbcode;
+	const u32 eax;
+	msr_t msr;
+
+	if (((eax >> 8) & 0xf) == 0xf) {
+		msr = rdmsr(0x2c);
+		fsbcode = (msr.lo >> 16) & 7;
+	} else {
+		fsbcode = rdmsr(MSR_FSB_FREQ).lo & 7;
+	}
+
    switch (fsbcode) {
    	case 0: return  800; /*  / 3 == 266 */
    	case 1: return  400; /*  / 3 == 133 */