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feat(amd64): add read/write_cr

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Loïc Grégoire
2026-03-29 21:19:47 -04:00
parent b0fb96dc5b
commit 6efee3aec3
1 changed files with 15 additions and 0 deletions
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src/platform/amd64/cpu.zig
+15
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@@ -137,6 +137,21 @@ pub inline fn rdtsc() u64 {
return @as(u64, high) << 32 | low; return @as(u64, high) << 32 | low;
} }
pub inline fn read_cr(comptime n: u2) u64 {
comptime std.debug.assert(n != 1);
return asm volatile (std.fmt.comptimePrint("mov %%cr{}, %[ret]", .{n})
: [ret] "=r" (-> u64),
);
}
pub inline fn write_cr(comptime n: u2, value: u64) void {
comptime std.debug.assert(n != 1);
asm volatile (std.fmt.comptimePrint("mov %[value], %%cr{}", .{n})
:
: [value] "r" (value),
);
}
pub const CpuidResult = struct { eax: u32, ebx: u32, ecx: u32, edx: u32 }; pub const CpuidResult = struct { eax: u32, ebx: u32, ecx: u32, edx: u32 };
pub inline fn cpuid(leaf: u32, subleaf: u32) CpuidResult { pub inline fn cpuid(leaf: u32, subleaf: u32) CpuidResult {