From 31aa84528af5a92c3019e6abaa949eb20a4e73d9 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 29 Feb 2024 21:55:23 -0500
Subject: kernel/amd64: pmap: Add routine to switch vas

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/pmap.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'sys/arch/amd64')

diff --git a/sys/arch/amd64/amd64/pmap.c b/sys/arch/amd64/amd64/pmap.c
index 5fe1e3b..e898e74 100644
--- a/sys/arch/amd64/amd64/pmap.c
+++ b/sys/arch/amd64/amd64/pmap.c
@@ -215,6 +215,17 @@ pmap_create_vas(struct vm_ctx *ctx)
     return new_vas;
 }
 
+void
+pmap_switch_vas(struct vm_ctx *ctx, struct vas vas)
+{
+    uintptr_t cr3_val = vas.cr3_flags | vas.top_level;
+
+    __ASMV("mov %0, %%cr3"
+           :
+           : "r" (cr3_val)
+           : "memory");
+}
+
 struct vas
 pmap_read_vas(void)
 {
-- 
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