kernel: add header files

arch/x86_64/include/kernel/machine/vm.h

@@ -0,0 +1,30 @@
+#ifndef KERNEL_X86_64_VM_H_
+#define KERNEL_X86_64_VM_H_
+
+/* kernel higher-half base virtual address. */
+#define VM_KERNEL_VOFFSET 0xFFFFFFFF80000000
+
+/* direct page-mapping region.
+   NOTE that these are the maximum bounds of this region.
+   the actual size depends on the amount of physical
+   memory present. */
+#define VM_PAGEMAP_BASE   0xFFFF888000000000
+#define VM_PAGEMAP_LIMIT  0xFFFFC87FFFFFFFFF
+
+#define VM_PAGE_SIZE      0x1000
+#define VM_PAGE_MASK      (VM_PAGE_SIZE - 1)
+#define VM_PAGE_SHIFT     12
+
+#define VM_PAGE_MIN_ORDER VM_PAGE_4K
+#define VM_PAGE_MAX_ORDER VM_PAGE_8M
+
+#define VM_ZONE_MIN       VM_ZONE_DMA
+#define VM_ZONE_MAX       VM_ZONE_NORMAL
+
+#define VM_USER_BASE      0x0000000000100000
+#define VM_USER_LIMIT     0x00007fffffffffff
+
+#define VM_KERNEL_BASE    0XFFFF800000000000
+#define VM_KERNEL_LIMIT   0XFFFFFFFFFFFFFFFF
+
+#endif