kernel/amd64: pmap: Add helper to set cache policy

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 10 insertions, 0 deletions

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)
 
 /*
@@ -67,6 +71,12 @@ struct vm_ctx {
 };
 
 /*
+ * 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.
  */