1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department and Ralph Campbell. 9 * 10 * %sccs.include.redist.c% 11 * 12 * from: Utah $Hdr: machparam.h 1.11 89/08/14$ 13 * 14 * @(#)param.h 8.5 (Berkeley) 06/02/95 15 */ 16 17 /* 18 * Machine dependent constants for DEC Station 3100. 19 */ 20 #define MACHINE "mips" 21 #define NCPUS 1 22 23 /* 24 * Round p (pointer or byte index) up to a correctly-aligned value for all 25 * data types (int, long, ...). The result is u_int and must be cast to 26 * any desired pointer type. 27 */ 28 #define ALIGNBYTES 7 29 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 30 31 #define NBPG 4096 /* bytes/page */ 32 #define PGOFSET (NBPG-1) /* byte offset into page */ 33 #define PGSHIFT 12 /* LOG2(NBPG) */ 34 #define NPTEPG (NBPG/4) 35 36 #define NBSEG 0x400000 /* bytes/segment */ 37 #define SEGOFSET (NBSEG-1) /* byte offset into segment */ 38 #define SEGSHIFT 22 /* LOG2(NBSEG) */ 39 40 #define KERNBASE 0x80000000 /* start of kernel virtual */ 41 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 42 43 #define DEV_BSIZE 512 44 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 45 #define BLKDEV_IOSIZE 2048 46 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 47 48 #define CLSIZE 1 49 #define CLSIZELOG2 0 50 51 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 52 #define SSIZE 1 /* initial stack size/NBPG */ 53 #define SINCR 1 /* increment of stack/NBPG */ 54 55 #define UPAGES 2 /* pages of u-area */ 56 #define UADDR 0xffffd000 /* address of u */ 57 #define UVPN (UADDR>>PGSHIFT)/* virtual page number of u */ 58 #define KERNELSTACK (UADDR+UPAGES*NBPG) /* top of kernel stack */ 59 60 /* 61 * Constants related to network buffer management. 62 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 63 * on machines that exchange pages of input or output buffers with mbuf 64 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 65 * of the hardware page size. 66 */ 67 #define MSIZE 128 /* size of an mbuf */ 68 #define MCLBYTES 1024 69 #define MCLSHIFT 10 70 #define MCLOFSET (MCLBYTES - 1) 71 #ifndef NMBCLUSTERS 72 #ifdef GATEWAY 73 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 74 #else 75 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 76 #endif 77 #endif 78 79 /* 80 * Size of kernel malloc arena in CLBYTES-sized logical pages 81 */ 82 #ifndef NKMEMCLUSTERS 83 #define NKMEMCLUSTERS (512*1024/CLBYTES) 84 #endif 85 86 /* pages ("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 /* pages to bytes */ 92 #define ctob(x) ((x)<<PGSHIFT) 93 94 /* bytes to pages */ 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 should use the bsize 105 * field from the disk label. 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 pmax_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 114 #define pmax_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 115 #define pmax_btop(x) ((unsigned)(x) >> PGSHIFT) 116 #define pmax_ptob(x) ((unsigned)(x) << PGSHIFT) 117 118 #ifndef LOCORE 119 #ifdef KERNEL 120 extern int (*Mach_splnet)(), (*Mach_splbio)(), (*Mach_splimp)(), 121 (*Mach_spltty)(), (*Mach_splclock)(), (*Mach_splstatclock)(); 122 #define splnet() ((*Mach_splnet)()) 123 #define splbio() ((*Mach_splbio)()) 124 #define splimp() ((*Mach_splimp)()) 125 #define spltty() ((*Mach_spltty)()) 126 #define splclock() ((*Mach_splclock)()) 127 #define splstatclock() ((*Mach_splstatclock)()) 128 extern int cpuspeed; 129 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 130 #else /* !KERNEL */ 131 #define DELAY(n) { register int N = (n); while (--N > 0); } 132 #endif /* !KERNEL */ 133 134 #ifndef _SIMPLELOCK_H_ 135 #define _SIMPLELOCK_H_ 136 /* 137 * A simple spin lock. 138 * 139 * This structure only sets one bit of data, but is sized based on the 140 * minimum word size that can be operated on by the hardware test-and-set 141 * instruction. It is only needed for multiprocessors, as uniprocessors 142 * will always run to completion or a sleep. It is an error to hold one 143 * of these locks while a process is sleeping. 144 */ 145 struct simplelock { 146 int lock_data; 147 }; 148 149 #if !defined(DEBUG) && NCPUS > 1 150 /* 151 * The simple-lock routines are the primitives out of which the lock 152 * package is built. The machine-dependent code must implement an 153 * atomic test_and_set operation that indivisibly sets the simple lock 154 * to non-zero and returns its old value. It also assumes that the 155 * setting of the lock to zero below is indivisible. Simple locks may 156 * only be used for exclusive locks. 157 */ 158 static __inline void 159 simple_lock_init(lkp) 160 struct simplelock *lkp; 161 { 162 163 lkp->lock_data = 0; 164 } 165 166 static __inline void 167 simple_lock(lkp) 168 __volatile struct simplelock *lkp; 169 { 170 171 while (test_and_set(&lkp->lock_data)) 172 continue; 173 } 174 175 static __inline int 176 simple_lock_try(lkp) 177 __volatile struct simplelock *lkp; 178 { 179 180 return (!test_and_set(&lkp->lock_data)) 181 } 182 183 static __inline void 184 simple_unlock(lkp) 185 __volatile struct simplelock *lkp; 186 { 187 188 lkp->lock_data = 0; 189 } 190 #endif /* NCPUS > 1 */ 191 #endif /* !_SIMPLELOCK_H_ */ 192 #endif /* LOCORE */ 193