--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uprogs/memlayout.h	Sun Oct 22 18:25:39 2017 +0900
@@ -0,0 +1,27 @@
+// Memory layout
+
+#define EXTMEM  0x8000    /* start of kernel code */
+#define PHYSTOP         0x8000000  /* assuming 128M RAM; need a fix to find the true RAM size */
+#define DEVSPACE        0xFE000000      /* i/o registers */
+
+// 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 USERBOUND 0x40000000        // maximum user space due to one page pgd
+
+#define MACHADDR        (KERNBASE+0x2000)
+#define PA_START 0x0
+#define PHYSIO          0x20000000
+#define RAMSIZE         (128*MByte)
+#define IOSIZE          (16*MByte)
+#define TVSIZE          0x1000
+
+static inline uint v2p(void *a) { return ((uint) (a))  - KERNBASE; }
+static inline void *p2v(uint a) { return (void *) ((a) + KERNBASE); }
+
+#define V2P(a) (((uint) (a)) - KERNBASE)
+#define P2V(a) (((void *) (a)) + KERNBASE)
+
+#define V2P_WO(x) ((x) - KERNBASE)    // same as V2P, but without casts
+#define P2V_WO(x) ((x) + KERNBASE)    // same as V2P, but without casts
+