[coreboot] New patch to review: ca06106 Crank up CPU speed on Intel Core and Core2 CPUs

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/176

-gerrit

commit ca06106e0e8de1777aa311c4ea1c1fd45f7eee38
Author: Patrick Georgi 
Date:   Tue Aug 9 08:52:14 2011 +0200

Crank up CPU speed on Intel Core and Core2 CPUs

The CPUs start on their slowest speed, and were left that way by
    coreboot. This change will speed up coreboot a bit, as well as
    systems that don't change the clock for whatever reason.

Change-Id: Ia6225eea97299a473cf50eccc6c5e7de830b1ddc
    Signed-off-by: Patrick Georgi 
---
 src/cpu/intel/model_6ex/model_6ex_init.c |   14 ++++++++++++++
 src/cpu/intel/model_6fx/model_6fx_init.c |   14 ++++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/src/cpu/intel/model_6ex/model_6ex_init.c b/src/cpu/intel/model_6ex/model_6ex_init.c
index eee651a..abd9cf4 100644
--- a/src/cpu/intel/model_6ex/model_6ex_init.c
+++ b/src/cpu/intel/model_6ex/model_6ex_init.c
@@ -30,6 +30,7 @@
 #include <cpu/intel/microcode.h>
 #include <cpu/intel/hyperthreading.h>
 #include <cpu/intel/speedstep.h>
+#include <cpu/intel/acpi.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/name.h>
 #include <usbdebug.h>
@@ -129,6 +130,19 @@ static void configure_misc(void)

msr.lo |= (1 << 20);	/* Lock Enhanced SpeedStep Enable */
    wrmsr(IA32_MISC_ENABLE, msr);
+
+	// set maximum CPU speed
+	msr = rdmsr(IA32_PERF_STS);
+	int busratio_max=(msr.hi >> (40-32)) & 0x1f;
+
+	msr = rdmsr(IA32_PLATFORM_ID);
+	int vid_max=msr.lo & 0x3f;
+
+	msr.lo &= ~0xffff;
+	msr.lo |= busratio_max << 8;
+	msr.lo |= vid_max;
+
+	wrmsr(IA32_PERF_CTL, msr);
 }

#define PIC_SENS_CFG	0x1aa
diff --git a/src/cpu/intel/model_6fx/model_6fx_init.c b/src/cpu/intel/model_6fx/model_6fx_init.c
index a3939c9..5cb1cae 100644
--- a/src/cpu/intel/model_6fx/model_6fx_init.c
+++ b/src/cpu/intel/model_6fx/model_6fx_init.c
@@ -29,6 +29,7 @@
 #include <cpu/x86/lapic.h>
 #include <cpu/intel/microcode.h>
 #include <cpu/intel/speedstep.h>
+#include <cpu/intel/acpi.h>
 #include <cpu/intel/hyperthreading.h>
 #include <cpu/x86/cache.h>
 #include <cpu/x86/name.h>
@@ -156,6 +157,19 @@ static void configure_misc(void)

msr.lo |= (1 << 20);	/* Lock Enhanced SpeedStep Enable */
    wrmsr(IA32_MISC_ENABLE, msr);
+
+	// set maximum CPU speed
+	msr = rdmsr(IA32_PERF_STS);
+	int busratio_max=(msr.hi >> (40-32)) & 0x1f;
+
+	msr = rdmsr(IA32_PLATFORM_ID);
+	int vid_max=msr.lo & 0x3f;
+
+	msr.lo &= ~0xffff;
+	msr.lo |= busratio_max << 8;
+	msr.lo |= vid_max;
+
+	wrmsr(IA32_PERF_CTL, msr);
 }

#define PIC_SENS_CFG	0x1aa