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cpu: Support querying the address width

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Different CPUs may support different address widths, meaning the amount of
memory they can address. Add a property for this to the cpu_info struct.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-04-08 16:57:20 -06:00 committed by Bin Meng
parent 98036fbdaf
commit 600f584d81
3 changed files with 4 additions and 0 deletions
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1
drivers/cpu/cpu_sandbox.c
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@ -19,6 +19,7 @@ int cpu_sandbox_get_info(struct udevice *dev, struct cpu_info *info)
{ {
info->cpu_freq = 42 * 42 * 42 * 42 * 42; info->cpu_freq = 42 * 42 * 42 * 42 * 42;
info->features = 0x42424242; info->features = 0x42424242;
info->address_width = IS_ENABLED(CONFIG_PHYS_64BIT) ? 64 : 32;
return 0; return 0;
} }

2
include/cpu.h
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@ -44,10 +44,12 @@ enum {
* *
* @cpu_freq: Current CPU frequency in Hz * @cpu_freq: Current CPU frequency in Hz
* @features: Flags for supported CPU features * @features: Flags for supported CPU features
* @address_width: Width of the CPU address space in bits (e.g. 32)
*/ */
struct cpu_info { struct cpu_info {
ulong cpu_freq; ulong cpu_freq;
ulong features; ulong features;
uint address_width;
}; };
struct cpu_ops { struct cpu_ops {

1
test/dm/cpu.c
View File

@ -33,6 +33,7 @@ static int dm_test_cpu(struct unit_test_state *uts)
ut_assertok(cpu_get_info(dev, &info)); ut_assertok(cpu_get_info(dev, &info));
ut_asserteq(info.cpu_freq, 42 * 42 * 42 * 42 * 42); ut_asserteq(info.cpu_freq, 42 * 42 * 42 * 42 * 42);
ut_asserteq(info.features, 0x42424242); ut_asserteq(info.features, 0x42424242);
ut_asserteq(info.address_width, 32);
ut_asserteq(cpu_get_count(dev), 42); ut_asserteq(cpu_get_count(dev), 42);