From 0d6c636c0ef3bcdc3285afb914cf28326b1b84ff Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 15 Sep 2025 14:57:21 -0400
Subject: kern/amd64: lapic: Add LAPIC timer support

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/arch/amd64/lapic.h | 15 +++++++++++++++
 src/sys/include/arch/amd64/mdcpu.h |  2 ++
 2 files changed, 17 insertions(+)

(limited to 'src/sys/include/arch/amd64')

diff --git a/src/sys/include/arch/amd64/lapic.h b/src/sys/include/arch/amd64/lapic.h
index d73e7d0..3cb2f3a 100644
--- a/src/sys/include/arch/amd64/lapic.h
+++ b/src/sys/include/arch/amd64/lapic.h
@@ -31,10 +31,25 @@
 #ifndef _MACHINE_LAPIC_H_
 #define _MACHINE_LAPIC_H_ 1
 
+#define LAPIC_TIMER_VEC 0x81
+
 /*
  * Initialize the local APIC on the current
  * processor.
  */
 void lapic_init(void);
 
+/*
+ * Send an end-of-interrupt message to the current
+ * processor's Local APIC
+ */
+void lapic_eoi(void);
+
+/*
+ * Start Local APIC timer oneshot in microseconds.
+ *
+ * @us: Microseconds.
+ */
+void lapic_timer_oneshot_us(size_t usec);
+
 #endif  /* !_MACHINE_LAPIC_H_ */
diff --git a/src/sys/include/arch/amd64/mdcpu.h b/src/sys/include/arch/amd64/mdcpu.h
index 1503adb..3fccc42 100644
--- a/src/sys/include/arch/amd64/mdcpu.h
+++ b/src/sys/include/arch/amd64/mdcpu.h
@@ -48,6 +48,7 @@
  * @lapic_base: LAPIC register interface base
  * @x2apic: Has the x2APIC? Is 1 if true
  * @tss: Task state segment for this core
+ * @lapic_tmr_freq: Local APIC timer frequency
  */
 struct mdcore {
     uint32_t apic_id;
@@ -55,6 +56,7 @@ struct mdcore {
     void *lapic_base;
     uint8_t x2apic : 1;
     struct tss_entry tss;
+    size_t lapic_tmr_freq;
 };
 
 #endif  /* !_MACHINE_MDCPU_H_ */
-- 
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