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
16