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/* bibop.h
*
* COPYRIGHT (c) 1994 AT&T Bell Laboratories.
*
* The BIBOP maps memory pages to page IDs. The interpretation of most
* of these IDs is defined by the GC (see ../gc/arena-id.h), but the
* IDs for unmapped memory are defined here.
*
*/
#ifndef _BIBOP_
#define _BIBOP_
typedef Unsigned16_t page_id_t;
#define PAGEID_unmapped 0xffff
#define isUNMAPPED(ID) ((ID) == PAGEID_unmapped)
/** The BIBOP **/
#ifdef TWO_LEVEL_MAP
# error two level BIBOP mapping not implemented
typedef page_id_t **bibop_t;
#else
#define BIBOP_SHIFT 16 /* log2(BIBOP_PAGE_SZB) */
#define BIBOP_BITS (BITS_PER_WORD-BIBOP_SHIFT)
#define BIBOP_SZ (1<<BIBOP_BITS)
#define BIBOP_ADDR_TO_INDEX(a) (((Addr_t)(a))>>BIBOP_SHIFT)
#define BIBOP_INDEX_TO_ADDR(i) ((Addr_t)((i) << BIBOP_SHIFT))
#define BIBOP_NBLKS_TO_SZB(i) ((Addr_t)((i) << BIBOP_SHIFT))
typedef page_id_t *bibop_t;
extern bibop_t BIBOP;
#define ADDR_TO_PAGEID(bibop,a) ((bibop)[BIBOP_ADDR_TO_INDEX(a)])
#endif /* !TWO_LEVEL_MAP */
#endif /* !_BIBOP_ */
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