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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>
This commit is contained in:
Simon Glass 2016-03-06 19:27:49 -07:00 committed by Bin Meng
parent e23c6c28b0
commit 740d5d34b1
2 changed files with 12 additions and 0 deletions
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7
cmd/cpu.c
View File

@ -14,6 +14,7 @@
static const char *cpu_feature_name[CPU_FEAT_COUNT] = { static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
"L1 cache", "L1 cache",
"MMU", "MMU",
"Microcode",
}; };
static int print_cpu_list(bool detail) static int print_cpu_list(bool detail)
@ -58,6 +59,12 @@ static int print_cpu_list(bool detail)
} }
} }
printf("\n"); 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; return 0;

5
include/cpu.h
View File

@ -15,15 +15,20 @@
* device. * device.
* *
* @cpu_id: Platform-specific way of identifying the CPU. * @cpu_id: Platform-specific way of identifying the CPU.
* @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
*/ */
struct cpu_platdata { struct cpu_platdata {
int cpu_id; int cpu_id;
int ucode_version;
ulong device_id;
}; };
/* CPU features - mostly just a placeholder for now */ /* CPU features - mostly just a placeholder for now */
enum { enum {
CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */ CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
CPU_FEAT_MMU = 1, /* Supports virtual memory */ 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, CPU_FEAT_COUNT,
}; };