From 0fa389d2fdb6ae7779f1a85c3fc4d37770ce771f Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 19 Nov 2025 23:41:15 -0500
Subject: kern/amd64: mp: Tear down lower half per AP

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/cpu/mp.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sys/arch/amd64/cpu/mp.c b/sys/arch/amd64/cpu/mp.c
index ea36829..ddd4d8a 100644
--- a/sys/arch/amd64/cpu/mp.c
+++ b/sys/arch/amd64/cpu/mp.c
@@ -42,6 +42,7 @@
 #include <md/cpu.h>
 #include <md/gdt.h>
 #include <mu/cpu.h>
+#include <mu/mmu.h>
 #include <os/process.h>
 #include <os/sched.h>
 #include <vm/vm.h>
@@ -116,6 +117,16 @@ static uint32_t ap_count = 0;
 static volatile uint32_t aps_up = 0;
 __section(".trampoline") static char ap_code[4096];
 
+static void
+clean_addrsp(void)
+{
+    struct mmu_vas old, new;
+
+    mu_pmap_readvas(&old);
+    mu_pmap_forkvas(&new);
+    mu_pmap_writevas(&new);
+}
+
 static void
 cpu_idle(struct mcb *mcb)
 {
@@ -271,6 +282,7 @@ cpu_lm_entry(void)
     );
 
     cpu_mtrr_fetch();
+    clean_addrsp();
 
     /*
      * Now we load all the MTRRs given to us by the BSP
-- 
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