1 /* $NetBSD: mips_param.h,v 1.15 1999/12/04 21:20:48 ragge Exp $ */ 2 3 /* 4 * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code 5 * to be the number of per-process-wired kernel-stack pages/PTES. 6 */ 7 8 #define SSIZE 1 /* initial stack size/NBPG */ 9 #define SINCR 1 /* increment of stack/NBPG */ 10 11 #define UPAGES 2 /* pages of u-area */ 12 #define USPACE (UPAGES*NBPG) /* size of u-area in bytes */ 13 14 #ifndef MSGBUFSIZE 15 #define MSGBUFSIZE NBPG /* default message buffer size */ 16 #endif 17 18 /* 19 * Round p (pointer or byte index) up to a correctly-aligned value for all 20 * data types (int, long, ...). The result is u_int and must be cast to 21 * any desired pointer type. 22 * 23 * ALIGNED_POINTER is a boolean macro that checks whether an address 24 * is valid to fetch data elements of type t from on this architecture. 25 * This does not reflect the optimal alignment, just the possibility 26 * (within reasonable limits). 27 * 28 */ 29 #define ALIGNBYTES 7 30 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 31 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 32 33 #ifdef MIPS_16K_PAGE /* enable kernel support for 16k pages */ 34 #define NBPG (1024*16) /* bytes/page */ 35 #define PGOFSET (NBPG-1) /* byte offset into page */ 36 #define PGSHIFT 14 /* LOG2(NBPG) */ 37 #else 38 #define NBPG 4096 /* bytes/page */ 39 #define PGOFSET (NBPG-1) /* byte offset into page */ 40 #define PGSHIFT 12 /* LOG2(NBPG) */ 41 #endif 42 #define NPTEPG (NBPG/4) 43 44 #define NBSEG 0x400000 /* bytes/segment */ 45 #define SEGOFSET (NBSEG-1) /* byte offset into segment */ 46 #define SEGSHIFT 22 /* LOG2(NBSEG) */ 47 48 /* 49 * Size of kernel malloc arena in NBPG-sized logical pages 50 */ 51 #ifndef NKMEMCLUSTERS 52 #define NKMEMCLUSTERS (6 * 1024 * 1024 / NBPG) 53 #endif 54 55 /* pages ("clicks") (4096 bytes) to disk blocks */ 56 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 57 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 58 59 /* pages to bytes */ 60 #define ctob(x) ((x) << PGSHIFT) 61 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 62 63 /* bytes to disk blocks */ 64 #define btodb(x) ((x) >> DEV_BSHIFT) 65 #define dbtob(x) ((x) << DEV_BSHIFT) 66 67 /* 68 * Map a ``block device block'' to a file system block. 69 * This should be device dependent, and should use the bsize 70 * field from the disk label. 71 * For now though just use DEV_BSIZE. 72 */ 73 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 74 75 /* 76 * Mach derived conversion macros 77 */ 78 #define mips_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 79 #define mips_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 80 #define mips_btop(x) ((unsigned)(x) >> PGSHIFT) 81 #define mips_ptob(x) ((unsigned)(x) << PGSHIFT) 82