From e4df7e2dc4d1d97900d3189a76a8116934b5467a Mon Sep 17 00:00:00 2001
From: AlmuHS <almuhs@github.com>
Date: Mon, 8 Jul 2019 20:55:49 +0200
Subject: experiment: added mutex in cpu_setup

---
 i386/i386/mp_desc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/i386/i386/mp_desc.c b/i386/i386/mp_desc.c
index 6eb3c6e6..3bb207b1 100644
--- a/i386/i386/mp_desc.c
+++ b/i386/i386/mp_desc.c
@@ -90,6 +90,7 @@ vm_offset_t	cpu_stack_high;
 
 
 static struct kmutex mp_cpu_boot_lock;
+static struct kmutex ap_config_lock;
 
 /*
  * Multiprocessor i386/i486 systems use a separate copy of the
@@ -299,6 +300,10 @@ cpu_setup()
 
     int i = 1;
     int kernel_id = 0;
+
+    kmutex_init(&ap_config_lock);
+    kmutex_lock(&ap_config_lock, FALSE);
+
     while(i < ncpu && (machine_slot[i].running == TRUE)) i++;
 
     /* assume Pentium 4, Xeon, or later processors */
@@ -354,6 +359,8 @@ cpu_setup()
     ktss_init();
     slave_main();
 
+    kmutex_unlock(&ap_config_lock);
+
     kernel_id = cpu_number();
     printf("cpu %d enabled\n", kernel_id);
 
-- 
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