cpu: Add support for microcode version and CPU ID
Some CPUs use microcode and each core can have a different version of
microcode loaded. Also some CPUs support the concept of an integer ID used
for identification purposes. Add support for these in the CPU uclass.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/cmd/cpu.c b/cmd/cpu.c
index b4af64f5..bc4dc5c 100644
--- a/cmd/cpu.c
+++ b/cmd/cpu.c
@@ -14,6 +14,7 @@
static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
"L1 cache",
"MMU",
+ "Microcode",
};
static int print_cpu_list(bool detail)
@@ -58,6 +59,12 @@
}
}
printf("\n");
+ if (info.features & (1 << CPU_FEAT_UCODE)) {
+ printf("\tMicrocode version %#x\n",
+ plat->ucode_version);
+ }
+ if (info.features & (1 << CPU_FEAT_DEVICE_ID))
+ printf("\tDevice ID %#lx\n", plat->device_id);
}
return 0;
diff --git a/include/cpu.h b/include/cpu.h
index bfb0db2..bda5315 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -15,15 +15,20 @@
* device.
*
* @cpu_id: Platform-specific way of identifying the CPU.
+ * @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
*/
struct cpu_platdata {
int cpu_id;
+ int ucode_version;
+ ulong device_id;
};
/* CPU features - mostly just a placeholder for now */
enum {
CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
CPU_FEAT_MMU = 1, /* Supports virtual memory */
+ CPU_FEAT_UCODE = 2, /* Requires/uses microcode */
+ CPU_FEAT_DEVICE_ID = 3, /* Provides a device ID */
CPU_FEAT_COUNT,
};