From aec200a3b8b4d5aabcc945536f9c872e7b4e4996 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 8 Jun 2024 18:05:18 -0400
Subject: kernel/amd64: lapic: Serialize lapic_timer_init()
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/arch/amd64/amd64/lapic.c | 6 ++++++
1 file changed, 6 insertions(+)
(limited to 'sys/arch')
diff --git a/sys/arch/amd64/amd64/lapic.c b/sys/arch/amd64/amd64/lapic.c
index 3a87b74..7b3bd98 100644
--- a/sys/arch/amd64/amd64/lapic.c
+++ b/sys/arch/amd64/amd64/lapic.c
@@ -32,6 +32,7 @@
#include <sys/panic.h>
#include <sys/mmio.h>
#include <sys/syslog.h>
+#include <sys/spinlock.h>
#include <dev/timer.h>
#include <machine/intr.h>
#include <machine/isa/i8254.h>
@@ -262,6 +263,9 @@ lapic_timer_init(void)
uint16_t ticks_start, ticks_end;
size_t ticks_total, freq;
const uint16_t MAX_SAMPLES = 0xFFFF;
+ static struct spinlock lock = {0};
+
+ spinlock_acquire(&lock);
lapic_timer_stop();
i8254_set_reload(MAX_SAMPLES);
@@ -275,6 +279,8 @@ lapic_timer_init(void)
freq = (MAX_SAMPLES / ticks_total) * I8254_DIVIDEND;
lapic_timer_stop();
+
+ spinlock_release(&lock);
return freq;
}
--
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