In fact the info is fetch through /proc/cpuinfo and not through cpuid for now.
This call can fetch:
cpu_info->vendor
cpu_info->family
cpu_info->model
cpu_info->stepping
cpu_info->cpuid_level
cpu_info->ext_cpuid_level
Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
CC: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
CC: cpufreq@xxxxxxxxxxxxxxx
---
lib/cpuid.h | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 86 insertions(+), 0 deletions(-)
diff --git a/lib/cpuid.h b/lib/cpuid.h
index 5f179db..c00c58d 100644
--- a/lib/cpuid.h
+++ b/lib/cpuid.h
@@ -3,6 +3,22 @@
#include <stdint.h>
+enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
+ X86_VENDOR_AMD, X86_VENDOR_MAX};
+
+static const char *cpu_vendor_table[] = {
+ "Unknown", "GenuineIntel", "AuthenticAMD",
+};
+
+struct cpupower_cpu_info {
+ enum cpupower_cpu_vendor vendor;
+ unsigned int family;
+ unsigned int model;
+ unsigned int stepping;
+ unsigned int cpuid_level;
+ uint32_t ext_cpuid_level;
+};
+
static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
@@ -62,4 +78,74 @@ static inline unsigned int cpuid_edx(unsigned int op)
return edx;
}
+/* get_cpu_info
+ *
+ * Extract CPU vendor, family, model, stepping info from /proc/cpuinfo
+ *
+ * Returns 0 on success or a negativ error code
+ *
+ * TBD: Should there be a cpuid alternative for this if /proc is not mounted?
+ */
+int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info)
+{
+ FILE *fp;
+ char value[64];
+ unsigned int proc, x;
+ unsigned int unknown = 0xffffff;
+
+ cpu_info->vendor = X86_VENDOR_UNKNOWN;
+ cpu_info->family = unknown;
+ cpu_info->model = unknown;
+ cpu_info->stepping = unknown;
+ cpu_info->cpuid_level = cpuid_eax(0);
+ cpu_info->ext_cpuid_level = cpuid_eax(0x80000000);
+
+
+ fp = fopen("/proc/cpuinfo", "r");
+ if (!fp)
+ return -EIO;
+
+ while (!feof(fp)) {
+ if (!fgets(value, 64, fp))
+ continue;
+ value[63 - 1] = '\0';
+
+ if (!strncmp(value, "processor\t: ", 12)) {
+ sscanf(value, "processor\t: %u", &proc);
+ }
+ if (proc != cpu)
+ continue;
+
+ /* Get CPU vendor */
+ if (!strncmp(value, "vendor_id", 9))
+ for (x = 1; x < X86_VENDOR_MAX; x++) {
+ if (strstr(value, cpu_vendor_table[x]))
+ cpu_info->vendor = x;
+ }
+ /* Get CPU family, etc. */
+ else if (!strncmp(value, "cpu family\t: ", 13)) {
+ sscanf(value, "cpu family\t: %u",
+ &cpu_info->family);
+ }
+ else if (!strncmp(value, "model\t\t: ", 9)) {
+ sscanf(value, "model\t\t: %u",
+ &cpu_info->model);
+ }
+ else if (!strncmp(value, "stepping\t: ", 10)) {
+ sscanf(value, "stepping\t: %u",
+ &cpu_info->stepping);
+
+ /* Exit -> all values must have been set */
+ if (cpu_info->vendor == X86_VENDOR_UNKNOWN ||
+ cpu_info->family == unknown ||
+ cpu_info->model == unknown ||
+ cpu_info->stepping == unknown)
+ return -EINVAL;
+
+ return 0;
+ }
+ }
+ return -ENODEV;
+}
+
#endif /* _CPUFREQ_CPUID_H */
--
1.6.4.2
--
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