1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)param.h 8.3 (Berkeley) 05/14/95 11 */ 12 13 /* 14 * Machine dependent constants for Intel 386. 15 */ 16 17 #define MACHINE "i386" 18 #define NCPUS 1 19 20 /* 21 * Round p (pointer or byte index) up to a correctly-aligned value for all 22 * data types (int, long, ...). The result is u_int and must be cast to 23 * any desired pointer type. 24 */ 25 #define ALIGNBYTES 3 26 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 27 28 #define NBPG 4096 /* bytes/page */ 29 #define PGOFSET (NBPG-1) /* byte offset into page */ 30 #define PGSHIFT 12 /* LOG2(NBPG) */ 31 #define NPTEPG (NBPG/(sizeof (struct pte))) 32 33 #define NBPDR (1024*NBPG) /* bytes/page dir */ 34 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 35 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 36 37 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 38 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 39 40 #define DEV_BSIZE 512 41 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 42 #define BLKDEV_IOSIZE 2048 43 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 44 45 #define CLSIZE 1 46 #define CLSIZELOG2 0 47 48 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 49 #define SSIZE 1 /* initial stack size/NBPG */ 50 #define SINCR 1 /* increment of stack/NBPG */ 51 52 #define UPAGES 2 /* pages of u-area */ 53 54 /* 55 * Constants related to network buffer management. 56 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 57 * on machines that exchange pages of input or output buffers with mbuf 58 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 59 * of the hardware page size. 60 */ 61 #define MSIZE 128 /* size of an mbuf */ 62 #define MCLBYTES 1024 63 #define MCLSHIFT 10 64 #define MCLOFSET (MCLBYTES - 1) 65 #ifndef NMBCLUSTERS 66 #ifdef GATEWAY 67 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 68 #else 69 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 70 #endif 71 #endif 72 73 /* 74 * Size of kernel malloc arena in CLBYTES-sized logical pages 75 */ 76 #ifndef NKMEMCLUSTERS 77 #define NKMEMCLUSTERS (2048*1024/CLBYTES) 78 #endif 79 /* 80 * Some macros for units conversion 81 */ 82 /* Core clicks (4096 bytes) to segments and vice versa */ 83 #define ctos(x) (x) 84 #define stoc(x) (x) 85 86 /* Core clicks (4096 bytes) to disk blocks */ 87 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 88 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 89 #define dtob(x) ((x)<<DEV_BSHIFT) 90 91 /* clicks to bytes */ 92 #define ctob(x) ((x)<<PGSHIFT) 93 94 /* bytes to clicks */ 95 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 96 97 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 98 ((bytes) >> DEV_BSHIFT) 99 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 100 ((db) << DEV_BSHIFT) 101 102 /* 103 * Map a ``block device block'' to a file system block. 104 * This should be device dependent, and will be if we 105 * add an entry to cdevsw/bdevsw for that purpose. 106 * For now though just use DEV_BSIZE. 107 */ 108 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 109 110 /* 111 * Mach derived conversion macros 112 */ 113 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 114 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 115 #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 116 #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 117 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 118 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 119 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 120 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 121 122 #ifndef KERNEL 123 /* DELAY is in locore.s for the kernel */ 124 #define DELAY(n) { register int N = (n); while (--N > 0); } 125 #endif 126 127 #ifndef _SIMPLELOCK_H_ 128 #define _SIMPLELOCK_H_ 129 /* 130 * A simple spin lock. 131 * 132 * This structure only sets one bit of data, but is sized based on the 133 * minimum word size that can be operated on by the hardware test-and-set 134 * instruction. It is only needed for multiprocessors, as uniprocessors 135 * will always run to completion or a sleep. It is an error to hold one 136 * of these locks while a process is sleeping. 137 */ 138 struct simplelock { 139 int lock_data; 140 }; 141 142 #if !defined(DEBUG) && NCPUS > 1 143 /* 144 * The simple-lock routines are the primitives out of which the lock 145 * package is built. The machine-dependent code must implement an 146 * atomic test_and_set operation that indivisibly sets the simple lock 147 * to non-zero and returns its old value. It also assumes that the 148 * setting of the lock to zero below is indivisible. Simple locks may 149 * only be used for exclusive locks. 150 */ 151 static __inline void 152 simple_lock_init(lkp) 153 struct simplelock *lkp; 154 { 155 156 lkp->lock_data = 0; 157 } 158 159 static __inline void 160 simple_lock(lkp) 161 __volatile struct simplelock *lkp; 162 { 163 164 while (test_and_set(&lkp->lock_data)) 165 continue; 166 } 167 168 static __inline int 169 simple_lock_try(lkp) 170 __volatile struct simplelock *lkp; 171 { 172 173 return (!test_and_set(&lkp->lock_data)) 174 } 175 176 static __inline void 177 simple_unlock(lkp) 178 __volatile struct simplelock *lkp; 179 { 180 181 lkp->lock_data = 0; 182 } 183 #endif /* NCPUS > 1 */ 184 #endif /* !_SIMPLELOCK_H_ */ 185