xv6_rpi_port/include/memlayout.h

/*****************************************************************
*       memlayout.h
*       by Zhiyi Huang, [email protected]
*       University of Otago
*
********************************************************************/



// Memory layout

#define EXTMEM  	0x8000    /* start of kernel code */
#define PHYSTOP         0xC000000  /* 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 GPUMEMBASE	0x40000000
#define GPUMEMSIZE	(1024*MBYTE)

#define PA_START 	0x0
#define PHYSIO          0x20000000
#define RAMSIZE         0xC000000
#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