root/memlayout.h

/*   */

INCLUDED FROM

   1 // Memory layout
   2 
   3 #define EXTMEM  0x100000            // Start of extended memory
   4 #define PHYSTOP 0xE000000           // Top physical memory
   5 #define DEVSPACE 0xFE000000         // Other devices are at high addresses
   6 
   7 // Key addresses for address space layout (see kmap in vm.c for layout)
   8 #define KERNBASE 0x80000000         // First kernel virtual address
   9 #define KERNLINK (KERNBASE+EXTMEM)  // Address where kernel is linked
  10 
  11 #define V2P(a) (((uint) (a)) - KERNBASE)
  12 #define P2V(a) ((void *)(((char *) (a)) + KERNBASE))
  13 
  14 #define V2P_WO(x) ((x) - KERNBASE)    // same as V2P, but without casts
  15 #define P2V_WO(x) ((x) + KERNBASE)    // same as P2V, but without casts

/*   */