1 files changed, 58 insertions, 0 deletions
diff --git a/mirai/asm/cpuid.zig b/mirai/asm/cpuid.zig
new file mode 100644
index 0000000..6367b42
--- /dev/null
+++ b/mirai/asm/cpuid.zig
@@ -0,0 +1,58 @@
+//! 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;
+        }
+    }
+}