From 312b5687c905a7614cdd1e5080a69bd12cbc95b4 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 2 Jun 2024 21:42:28 -0400
Subject: kernel/amd64: pmap: Add helper 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/vm')

diff --git a/sys/include/vm/pmap.h b/sys/include/vm/pmap.h
index 8c69372..cb18885 100644
--- a/sys/include/vm/pmap.h
+++ b/sys/include/vm/pmap.h
@@ -54,6 +54,10 @@
 #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 */
+
 #define is_vas_valid(vas) (vas.top_level != 0)
 
 /*
@@ -66,6 +70,12 @@ struct vm_ctx {
     struct spinlock dynalloc_lock;
 };
 
+/*
+ * Mark a virtual address with a specific caching
+ * type.
+ */
+int pmap_set_cache(struct vm_ctx *, struct vas, vaddr_t, int);
+
 /*
  * Create a virtual address space
  * and return the descriptor.
-- 
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