1 /* $NetBSD: mips_param.h,v 1.14 1999/09/25 00:00:37 shin Exp $ */ 2 3 /* 4 * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE. 5 * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code 6 * to be the number of per-process-wired kernel-stack pages/PTES. 7 */ 8 9 #define SSIZE 1 /* initial stack size/NBPG */ 10 #define SINCR 1 /* increment of stack/NBPG */ 11 12 #define UPAGES 2 /* pages of u-area */ 13 #define USPACE (UPAGES*NBPG) /* size of u-area in bytes */ 14 15 #ifndef MSGBUFSIZE 16 #define MSGBUFSIZE NBPG /* default message buffer size */ 17 #endif 18 19 /* 20 * Round p (pointer or byte index) up to a correctly-aligned value for all 21 * data types (int, long, ...). The result is u_int and must be cast to 22 * any desired pointer type. 23 * 24 * ALIGNED_POINTER is a boolean macro that checks whether an address 25 * is valid to fetch data elements of type t from on this architecture. 26 * This does not reflect the optimal alignment, just the possibility 27 * (within reasonable limits). 28 * 29 */ 30 #define ALIGNBYTES 7 31 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 32 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 33 34 #ifdef MIPS_16K_PAGE /* enable kernel support for 16k pages */ 35 #define NBPG (1024*16) /* bytes/page */ 36 #define PGOFSET (NBPG-1) /* byte offset into page */ 37 #define PGSHIFT 14 /* LOG2(NBPG) */ 38 #else 39 #define NBPG 4096 /* bytes/page */ 40 #define PGOFSET (NBPG-1) /* byte offset into page */ 41 #define PGSHIFT 12 /* LOG2(NBPG) */ 42 #endif 43 #define NPTEPG (NBPG/4) 44 45 #define NBSEG 0x400000 /* bytes/segment */ 46 #define SEGOFSET (NBSEG-1) /* byte offset into segment */ 47 #define SEGSHIFT 22 /* LOG2(NBSEG) */ 48 49 /* 50 * Size of kernel malloc arena in CLBYTES-sized logical pages 51 */ 52 #ifndef NKMEMCLUSTERS 53 #define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES) 54 #endif 55 56 /* pages ("clicks") (4096 bytes) to disk blocks */ 57 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 58 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 59 60 /* pages to bytes */ 61 #define ctob(x) ((x) << PGSHIFT) 62 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 63 64 /* bytes to disk blocks */ 65 #define btodb(x) ((x) >> DEV_BSHIFT) 66 #define dbtob(x) ((x) << DEV_BSHIFT) 67 68 /* 69 * Map a ``block device block'' to a file system block. 70 * This should be device dependent, and should use the bsize 71 * field from the disk label. 72 * For now though just use DEV_BSIZE. 73 */ 74 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 75 76 /* 77 * Mach derived conversion macros 78 */ 79 #define mips_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 80 #define mips_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 81 #define mips_btop(x) ((unsigned)(x) >> PGSHIFT) 82 #define mips_ptob(x) ((unsigned)(x) << PGSHIFT) 83