1 /* $NetBSD: mips_param.h,v 1.18 2000/02/19 09:22:51 mycroft Exp $ */ 2 3 #ifdef _KERNEL 4 #include <machine/cpu.h> 5 #endif 6 7 /* 8 * On mips, UPAGES is fixed by sys/arch/mips/mips/locore code 9 * to be the number of per-process-wired kernel-stack pages/PTES. 10 */ 11 12 #define SSIZE 1 /* initial stack size/NBPG */ 13 #define SINCR 1 /* increment of stack/NBPG */ 14 15 #define UPAGES 2 /* pages of u-area */ 16 #define USPACE (UPAGES*NBPG) /* size of u-area in bytes */ 17 18 #ifndef MSGBUFSIZE 19 #define MSGBUFSIZE NBPG /* default message buffer size */ 20 #endif 21 22 /* 23 * Round p (pointer or byte index) up to a correctly-aligned value for all 24 * data types (int, long, ...). The result is u_int and must be cast to 25 * any desired pointer type. 26 * 27 * ALIGNED_POINTER is a boolean macro that checks whether an address 28 * is valid to fetch data elements of type t from on this architecture. 29 * This does not reflect the optimal alignment, just the possibility 30 * (within reasonable limits). 31 * 32 */ 33 #define ALIGNBYTES 7 34 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 35 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 36 37 #ifdef MIPS_16K_PAGE /* enable kernel support for 16k pages */ 38 #define NBPG (1024*16) /* bytes/page */ 39 #define PGOFSET (NBPG-1) /* byte offset into page */ 40 #define PGSHIFT 14 /* LOG2(NBPG) */ 41 #else 42 #define NBPG 4096 /* bytes/page */ 43 #define PGOFSET (NBPG-1) /* byte offset into page */ 44 #define PGSHIFT 12 /* LOG2(NBPG) */ 45 #endif 46 #define NPTEPG (NBPG/4) 47 48 #define NBSEG 0x400000 /* bytes/segment */ 49 #define SEGOFSET (NBSEG-1) /* byte offset into segment */ 50 #define SEGSHIFT 22 /* LOG2(NBSEG) */ 51 52 /* 53 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 54 * logical pages. 55 */ 56 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 57 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 58 59 /* pages ("clicks") (4096 bytes) to disk blocks */ 60 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 61 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 62 63 /* pages to bytes */ 64 #define ctob(x) ((x) << PGSHIFT) 65 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 66 67 /* bytes to disk blocks */ 68 #define btodb(x) ((x) >> DEV_BSHIFT) 69 #define dbtob(x) ((x) << DEV_BSHIFT) 70 71 /* 72 * Map a ``block device block'' to a file system block. 73 * This should be device dependent, and should use the bsize 74 * field from the disk label. 75 * For now though just use DEV_BSIZE. 76 */ 77 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 78 79 /* 80 * Mach derived conversion macros 81 */ 82 #define mips_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 83 #define mips_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 84 #define mips_btop(x) ((unsigned)(x) >> PGSHIFT) 85 #define mips_ptob(x) ((unsigned)(x) << PGSHIFT) 86