From b1ed22d84f2aae617c90c60701e9f25345cab980 Mon Sep 17 00:00:00 2001
From: Colin Davidson <colrdavidson@gmail.com>
Date: Sun, 8 Jun 2025 16:16:34 -0700
Subject: [PATCH] fix frequency grab

---
 core/sys/darwin/mach_darwin.odin | 4 ++--
 core/time/tsc_darwin.odin        | 8 +++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/core/sys/darwin/mach_darwin.odin b/core/sys/darwin/mach_darwin.odin
index 01affa6e8..2c8f38002 100644
--- a/core/sys/darwin/mach_darwin.odin
+++ b/core/sys/darwin/mach_darwin.odin
@@ -123,7 +123,7 @@ x86_thread_state32_t :: struct {
 }
 X86_THREAD_STATE32_COUNT :: size_of(x86_thread_state32_t) / size_of(u32)
 
-x86_thread_state64_t :: struct {
+x86_thread_state64_t :: struct #packed {
 	rax: u64,
 	rbx: u64,
 	rcx: u64,
@@ -148,7 +148,7 @@ x86_thread_state64_t :: struct {
 }
 X86_THREAD_STATE64_COUNT :: size_of(x86_thread_state64_t) / size_of(u32)
 
-arm_thread_state64_t :: struct {
+arm_thread_state64_t :: struct #packed {
 	x: [29]u64,
 	fp: u64,
 	lr: u64,
diff --git a/core/time/tsc_darwin.odin b/core/time/tsc_darwin.odin
index 3726cff49..1210992a6 100644
--- a/core/time/tsc_darwin.odin
+++ b/core/time/tsc_darwin.odin
@@ -4,7 +4,13 @@ package time
 import "core:sys/unix"
 
 _get_tsc_frequency :: proc "contextless" () -> (freq: u64, ok: bool) {
-	unix.sysctlbyname("machdep.tsc.frequency", &freq) or_return
+    if ODIN_ARCH == .amd64 {
+        unix.sysctlbyname("machdep.tsc.frequency", &freq) or_return
+    } else if ODIN_ARCH == .arm64 {
+        unix.sysctlbyname("hw.tbfrequency", &freq) or_return
+    } else {
+        return
+    }
 	ok = true
 	return
 }