cpuid.zig

fn cpuid(leaf_id: u32) [16]u8 {
    var result: [16]u8 = undefined;

    asm volatile (
        \\ cpuid
        \\ movl %%eax, 0(%[leaf_ptr])
        \\ movl %%ebx, 4(%[leaf_ptr])
        \\ movl %%ecx, 8(%[leaf_ptr])
        \\ movl %%edx, 12(%[leaf_ptr])
        :
        : [leaf_id] "{eax}" (leaf_id),
          [subid] "{ecx}" (@as(u32, 0)),
          [leaf_ptr] "r" (&result)
        : "eax", "ebx", "ecx", "edx"
    );

    return result;
}

pub fn main() !void {
    @import("std").debug.print("{}{}{}\n", .{
        cpuid(0x80000002),
        cpuid(0x80000003),
        cpuid(0x80000004),
    });
}