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memlayout.h

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+// Memory layout
+
+#define EXTMEM  0x100000            // Start of extended memory
+#define PHYSTOP 0xE000000           // Top physical memory
+#define DEVSPACE 0xFE000000         // Other devices are at high addresses
+
+// Key addresses for address space layout (see kmap in vm.c for layout)
+#define KERNBASE 0x80000000         // First kernel virtual address
+#define KERNLINK (KERNBASE + EXTMEM)  // Address where kernel is linked
+
+#define V2P(a) (((uint) (a)) - KERNBASE)
+#define P2V(a) ((void *)(((char *) (a)) + KERNBASE))
+
+#define V2P_WO(x) ((x) - KERNBASE)    // same as V2P, but without casts
+#define P2V_WO(x) ((x) + KERNBASE)    // same as P2V, but without casts