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//! CPUID Operations
pub const CpuidResult = struct {
eax: u32,
ebx: u32,
ecx: u32,
edx: u32,
};
/// Execute CPUID instruction with given leaf
pub inline fn cpuid(leaf: u32) CpuidResult {
var eax: u32 = undefined;
var ebx: u32 = undefined;
var ecx: u32 = undefined;
var edx: u32 = undefined;
asm volatile ("cpuid"
: [eax] "={eax}" (eax),
[ebx] "={ebx}" (ebx),
[ecx] "={ecx}" (ecx),
[edx] "={edx}" (edx),
: [leaf] "{eax}" (leaf),
);
return CpuidResult{
.eax = eax,
.ebx = ebx,
.ecx = ecx,
.edx = edx,
};
}
/// Get maximum extended CPUID leaf
pub inline fn get_max_extended() u32 {
return cpuid(0x80000000).eax;
}
/// Check if extended brand string is supported
pub inline fn has_brand_string() bool {
return get_max_extended() >= 0x80000004;
}
/// Get CPU brand string (48 bytes)
pub fn get_brand_string(buffer: *[48]u8) void {
var pos: usize = 0;
inline for ([_]u32{ 0x80000002, 0x80000003, 0x80000004 }) |leaf| {
const result = cpuid(leaf);
inline for ([_]u32{ result.eax, result.ebx, result.ecx, result.edx }) |reg| {
buffer[pos] = @truncate(reg);
buffer[pos + 1] = @truncate(reg >> 8);
buffer[pos + 2] = @truncate(reg >> 16);
buffer[pos + 3] = @truncate(reg >> 24);
pos += 4;
}
}
}
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