[M] Change in coreboot[master]: src/arch/x86 Add CPU frequency APIs

[Wonkyu Kim (Code Review)]

Wonkyu Kim has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74389 )

Change subject: src/arch/x86 Add CPU frequency APIs
......................................................................

src/arch/x86 Add CPU frequency APIs

Signed-off-by: Wonkyu Kim 
Change-Id: I8eb4397b4a8d4058af1b5c67716ee625261c4e2a
---
M src/arch/x86/cpu_common.c
M src/arch/x86/include/arch/cpu.h
2 files changed, 52 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/89/74389/1

diff --git a/src/arch/x86/cpu_common.c b/src/arch/x86/cpu_common.c
index e674afa..58eb57b 100644
--- a/src/arch/x86/cpu_common.c
+++ b/src/arch/x86/cpu_common.c
@@ -2,6 +2,8 @@

#include <cpu/cpu.h>
 #include <types.h>
+#include <cpu/x86/msr.h>
+#include <intelblocks/msr.h>

#if ENV_X86_32
 /* Standard macro to see if a specific flag is changeable */
@@ -212,3 +214,38 @@

return true;
 }
+
+uint32_t cpu_get_current_freq(void)
+{
+	msr_t msr;
+	uint32_t ratio, freq;
+	msr = rdmsr(IA32_PERF_CTL);
+	ratio =  (msr.lo >> 8) & 0xff;
+	freq = ratio * CONFIG_CPU_BCLK_MHZ;
+	return freq;
+}
+
+uint32_t cpu_get_max_turbo_freq(void)
+{
+	msr_t msr;
+	uint32_t ratio, freq;
+	msr = rdmsr(MSR_TURBO_RATIO_LIMIT);
+	ratio = msr.lo  & 0xff;
+	freq = ratio * CONFIG_CPU_BCLK_MHZ;
+	return freq;
+}
+
+uint32_t cpu_get_max_non_turbo_freq(void)
+{
+	msr_t msr;
+	uint32_t ratio, freq;
+	msr = rdmsr(MSR_PLATFORM_INFO);
+	ratio = (msr.lo >> 8) & 0xff;
+	freq = ratio * CONFIG_CPU_BCLK_MHZ;
+	return freq;
+}
+
+uint32_t cpu_get_base_freq(void)
+{
+	return cpuid_eax(0x16);
+}
diff --git a/src/arch/x86/include/arch/cpu.h b/src/arch/x86/include/arch/cpu.h
index b8c990e..3819f44 100644
--- a/src/arch/x86/include/arch/cpu.h
+++ b/src/arch/x86/include/arch/cpu.h
@@ -313,4 +313,9 @@
  */
 bool fill_cpu_cache_info(uint8_t level, struct cpu_cache_info *info);

+uint32_t cpu_get_current_freq(void);
+uint32_t cpu_get_max_turbo_freq(void);
+uint32_t cpu_get_max_non_turbo_freq(void);
+uint32_t cpu_get_base_freq(void);
+
 #endif /* ARCH_CPU_H */