root/memlayout.h

INCLUDED FROM

DEFINITIONS

1. v2p
2. p2v

   1 // Memory layout
   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
   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
  11 #ifndef __ASSEMBLER__
  13 static inline uint v2p(void *a) { return ((uint) (a))  - KERNBASE; }
  14 static inline void *p2v(uint a) { return (void *) ((a) + KERNBASE); }
  16 #endif
  18 #define V2P(a) (((uint) (a)) - KERNBASE)
  19 #define P2V(a) (((void *) (a)) + KERNBASE)
  21 #define V2P_WO(x) ((x) - KERNBASE)    // same as V2P, but without casts
  22 #define P2V_WO(x) ((x) + KERNBASE)    // same as V2P, but without casts