From 2b8dbfda5913761aa0bd42de9f9adf3a2a3bd4e5 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 9 Jul 2024 14:24:02 -0400
Subject: kernel/amd64: Add function to set cache policy

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/vm/pmap.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'sys/include')

diff --git a/sys/include/vm/pmap.h b/sys/include/vm/pmap.h
index 4cd334c..741eaf2 100644
--- a/sys/include/vm/pmap.h
+++ b/sys/include/vm/pmap.h
@@ -39,6 +39,10 @@
 #define PROT_EXEC       BIT(1)      /* Executable */
 #define PROT_USER       BIT(2)      /* User accessible */
 
+/* Caching types */
+#define VM_CACHE_UC 0x00000U /* Uncachable */
+#define VM_CACHE_WT 0x00001U /* Write-through */
+
 typedef uint32_t vm_prot_t;
 
 /*
@@ -71,4 +75,10 @@ int pmap_map(struct vas vas, vaddr_t va, paddr_t pa, vm_prot_t prot);
  */
 int pmap_unmap(struct vas vas, vaddr_t va);
 
+/*
+ * Mark a virtual address with a specific
+ * caching type.
+ */
+int pmap_set_cache(struct vas vas, vaddr_t va, int type);
+
 #endif  /* !_VM_PMAP_H_ */
-- 
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