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x86: Move common Intel CPU info code into a function

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Add cpu_intel_get_info() to find out the CPU info on modern Intel CPUs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: add parameter and return value descriptions]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-09-25 08:11:35 -06:00 committed by Bin Meng
parent 46dd41fa5a
commit d3abc5d1ee
4 changed files with 32 additions and 14 deletions
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9
arch/x86/cpu/broadwell/cpu_full.c
View file

@ -645,14 +645,7 @@ void cpu_set_power_limits(int power_limit_1_time)
static int broadwell_get_info(struct udevice *dev, struct cpu_info *info)
{
msr_t msr;
msr = msr_read(IA32_PERF_CTL);
info->cpu_freq = ((msr.lo >> 8) & 0xff) * BROADWELL_BCLK * 1000000;
info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU |
1 << CPU_FEAT_UCODE | 1 << CPU_FEAT_DEVICE_ID;
return 0;
return cpu_intel_get_info(info, BROADWELL_BCLK);
}
static int broadwell_get_count(struct udevice *dev)

13
arch/x86/cpu/intel_common/cpu.c
View file

@ -4,6 +4,7 @@
*/
#include <common.h>
#include <cpu.h>
#include <dm.h>
#include <errno.h>
#include <asm/cpu_common.h>
@ -110,3 +111,15 @@ int cpu_set_flex_ratio_to_tdp_nominal(void)
/* Not reached */
return -EINVAL;
}
int cpu_intel_get_info(struct cpu_info *info, int bclk)
{
msr_t msr;
msr = msr_read(IA32_PERF_CTL);
info->cpu_freq = ((msr.lo >> 8) & 0xff) * bclk * 1000000;
info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU |
1 << CPU_FEAT_UCODE | 1 << CPU_FEAT_DEVICE_ID;
return 0;
}

8
arch/x86/cpu/ivybridge/model_206ax.c
View file

@ -12,6 +12,7 @@
#include <fdtdec.h>
#include <malloc.h>
#include <asm/cpu.h>
#include <asm/cpu_common.h>
#include <asm/cpu_x86.h>
#include <asm/msr.h>
#include <asm/msr-index.h>
@ -436,12 +437,7 @@ static int model_206ax_init(struct udevice *dev)
static int model_206ax_get_info(struct udevice *dev, struct cpu_info *info)
{
msr_t msr;
msr = msr_read(MSR_IA32_PERF_CTL);
info->cpu_freq = ((msr.lo >> 8) & 0xff) * SANDYBRIDGE_BCLK * 1000000;
info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU |
1 << CPU_FEAT_UCODE;
return cpu_intel_get_info(info, SANDYBRIDGE_BCLK);
return 0;
}

16
arch/x86/include/asm/cpu_common.h
View file

@ -8,6 +8,8 @@
#define IA32_PERF_CTL 0x199
struct cpu_info;
/**
* cpu_common_init() - Set up common CPU init
*
@ -31,4 +33,18 @@ int cpu_common_init(void);
*/
int cpu_set_flex_ratio_to_tdp_nominal(void);
/**
* cpu_intel_get_info() - Obtain CPU info for Intel CPUs
*
* Most Intel CPUs use the same MSR to obtain the clock speed, and use the same
* features. This function fills in these values, given the value of the base
* clock in MHz (typically this should be set to 100).
*
* @info: cpu_info struct to fill in
* @bclk_mz: the base clock in MHz
*
* @return 0 always
*/
int cpu_intel_get_info(struct cpu_info *info, int bclk_mz);
#endif