Cleaner include paths + some paging definitions

src/mem/paging/paging.h

@@ -1,16 +1,29 @@
-#ifndef PAGING_PMM_H
-#define PAGING_PMM_H
-
-/*
-We are going to use a bitmap, consisting of an array of uint64_t
-to represent pages for the PMM (physical memory manager).
-
-Bit set (1) = page used
-Bit clear (0) = page free
-
-*/
+#ifndef PAGING_H
+#define PAGING_H
 
 #define PAGE_SIZE 4096
 #define BITS_PER_ROW 64
 
+#include <stdint.h>
+
+void paging_init();
+
+extern uint64_t hhdm_off;
+
+#define PHYS_TO_VIRT(x) ((void*)((uintptr_t)(x) + hhdm_off))
+#define VIRT_TO_PHYS(x) ((uintptr_t)(x) - hhdm_off)
+
+// Stole it
+#define ALIGN_UP(x, align)   (((x) + ((align) - 1)) & ~((align) - 1))
+#define ALIGN_DOWN(x, align) ((x) & ~((align) - 1))
+
+// Page entry special bits
+// Bits set on a parent (directory, table) fall back to their children
+#define PTE_PRESENT  (1ULL << 0)
+#define PTE_WRITE    (1ULL << 1)
+#define PTE_USER     (1ULL << 2)
+#define PTE_HUGE     (1ULL << 7)
+#define PTE_NOEXEC   (1ULL << 63)
+
+
 #endif