stos/amd64: mmu: Implement page mapping

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/stos/head/hal/mmu.h

@@ -10,8 +10,18 @@
 #define _HAL_MMU_H_ 1
 
 #include <stdef.h>
+#include <stapi/status.h>
 #include <machine/vas.h>
 
+#define PAGE_READONLY       0x00    /* Readonly */
+#define PAGE_READONLY_X     0x02    /* Read/execute */
+#define PAGE_READWRITE      0x03    /* Read/write */
+#define PAGE_READWRITE_X    0x04    /* Read/write/execute */
+
+typedef enum {
+    PAGESIZE_4K
+} MMU_PAGESIZE;
+
 /*
  * Read the current virtual address space
  *
@@ -26,4 +36,18 @@ VOID HalMmuReadVas(MMU_VAS *Result);
  */
 VOID HalMmuWriteVas(MMU_VAS *Vas);
 
+/*
+ * Map a single page of memory
+ *
+ * @Vas:        Virtual address space to map within
+ * @Vma:        Virtual memory address to map
+ * @Pma:        Physical memory address to map
+ * @Flags:      Flags to map with
+ * @PageSize:   Pagesize to map
+ */
+ST_STATUS HalMmuMapSingle(
+    MMU_VAS *Vas, UPTR Vma, UPTR Pma,
+    USHORT Flags, MMU_PAGESIZE PageSize
+);
+
 #endif  /* !_HAL_MMU_H_ */