1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 37 * $Id: param.h,v 1.38 1997/08/29 09:02:40 kato Exp $ 38 */ 39 40 #ifndef _MACHINE_PARAM_H_ 41 #define _MACHINE_PARAM_H_ 42 43 /* 44 * Machine dependent constants for Intel 386. 45 */ 46 47 #define MACHINE "i386" 48 #ifdef SMP 49 #define NCPUS 2 50 #else 51 #define NCPUS 1 52 #endif 53 #define MID_MACHINE MID_I386 54 55 /* 56 * Architecture dependent constant for i386 based machines. 57 */ 58 #ifdef PC98 59 /* NEC PC-9801/9821 series and compatibles. */ 60 #define MACHINE_ARCH "pc-98" 61 #else 62 /* IBM-PC compatibles. */ 63 #define MACHINE_ARCH "ibm-pc" 64 #endif 65 66 #ifndef LOCORE 67 68 /* 69 * Round p (pointer or byte index) up to a correctly-aligned value 70 * for all data types (int, long, ...). The result is unsigned int 71 * and must be cast to any desired pointer type. 72 */ 73 #define ALIGNBYTES (sizeof(int) - 1) 74 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 75 76 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 77 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 78 #define PAGE_MASK (PAGE_SIZE-1) 79 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 80 81 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 82 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 83 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 84 #define PDRMASK (NBPDR-1) 85 86 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 87 #define DEV_BSIZE (1<<DEV_BSHIFT) 88 89 #define BLKDEV_IOSIZE 2048 90 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 91 92 #define IOPAGES 2 /* pages of i/o permission bitmap */ 93 #define UPAGES 2 /* pages of u-area */ 94 #define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 95 /* the upages used to be. DO NOT CHANGE! */ 96 97 /* 98 * Constants related to network buffer management. 99 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 100 * on machines that exchange pages of input or output buffers with mbuf 101 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 102 * of the hardware page size. 103 */ 104 #ifndef MSIZE 105 #define MSIZE 128 /* size of an mbuf */ 106 #endif /* MSIZE */ 107 108 #ifndef MCLSHIFT 109 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 110 #endif /* MCLSHIFT */ 111 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 112 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 113 114 /* 115 * Some macros for units conversion 116 */ 117 118 /* clicks to bytes */ 119 #define ctob(x) ((x)<<PAGE_SHIFT) 120 121 /* bytes to clicks */ 122 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 123 124 /* 125 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 126 * want to shift an unsigned type to avoid sign extension and we don't 127 * want to widen `bytes' unnecessarily. Assume that the result fits in 128 * a daddr_t. 129 */ 130 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 131 (sizeof (bytes) > sizeof(long) \ 132 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 133 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 134 135 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 136 ((off_t)(db) << DEV_BSHIFT) 137 138 /* 139 * Mach derived conversion macros 140 */ 141 #define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 142 #define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 143 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 144 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 145 146 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 147 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 148 149 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 150 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 151 152 #endif /* !LOCORE */ 153 154 155 #ifndef _SIMPLELOCK_H_ 156 #define _SIMPLELOCK_H_ 157 158 /* 159 * XXX some temp debug control of cpl locks 160 */ 161 #define REAL_ECPL /* exception.s: SCPL_LOCK/SCPL_UNLOCK */ 162 #define REAL_ICPL /* ipl.s: CPL_LOCK/CPL_UNLOCK/FAST */ 163 #define REAL_AICPL /* apic_ipl.s: SCPL_LOCK/SCPL_UNLOCK */ 164 #define REAL_AVCPL /* apic_vector.s: CPL_LOCK/CPL_UNLOCK */ 165 166 #define REAL_IFCPL /* ipl_funcs.c: SCPL_LOCK/SCPL_UNLOCK */ 167 168 #define REAL_MCPL_NOT /* microtime.s: CPL_LOCK/movl $0,_cpl_lock */ 169 170 171 #ifdef LOCORE 172 173 #ifdef SMP 174 175 #define MPLOCKED lock ; 176 177 /* 178 * Some handy macros to allow logical organization and 179 * convenient reassignment of various locks. 180 */ 181 182 #define FPU_LOCK call _get_fpu_lock 183 #define ALIGN_LOCK call _get_align_lock 184 #define SYSCALL_LOCK call _get_syscall_lock 185 #define ALTSYSCALL_LOCK call _get_altsyscall_lock 186 187 /* 188 * Protects INTR() ISRs. 189 */ 190 #define ISR_TRYLOCK \ 191 pushl $_mp_lock ; /* GIANT_LOCK */ \ 192 call _MPtrylock ; /* try to get lock */ \ 193 add $4, %esp 194 195 #define ISR_RELLOCK \ 196 pushl $_mp_lock ; /* GIANT_LOCK */ \ 197 call _MPrellock ; \ 198 add $4, %esp 199 200 /* 201 * Protects the IO APIC and apic_imen as a critical region. 202 */ 203 #define IMASK_LOCK \ 204 pushl $_imen_lock ; /* address of lock */ \ 205 call _s_lock ; /* MP-safe */ \ 206 addl $4, %esp 207 208 #define IMASK_UNLOCK \ 209 pushl $_imen_lock ; /* address of lock */ \ 210 call _s_unlock ; /* MP-safe */ \ 211 addl $4, %esp 212 213 /* 214 * Variations of CPL_LOCK protect spl updates as a critical region. 215 * Items within this 'region' include: 216 * cpl 217 * cil 218 * ipending 219 * ??? 220 */ 221 222 /* 223 * Botom half routines, ie. those already protected from INTs. 224 * 225 * Used in: 226 * sys/i386/i386/microtime.s (XXX currently NOT used, possible race?) 227 * sys/i386/isa/ipl.s: _doreti 228 * sys/i386/isa/apic_vector.s: _Xintr0, ..., _Xintr23 229 */ 230 #define CPL_LOCK \ 231 pushl $_cpl_lock ; /* address of lock */ \ 232 call _s_lock ; /* MP-safe */ \ 233 addl $4, %esp 234 235 #define CPL_UNLOCK \ 236 pushl $_cpl_lock ; /* address of lock */ \ 237 call _s_unlock ; /* MP-safe */ \ 238 addl $4, %esp 239 240 /* 241 * INT safe version for top half of kernel. 242 * 243 * Used in: 244 * sys/i386/i386/exception.s: _Xfpu, _Xalign, _Xsyscall, _Xint0x80_syscall 245 * sys/i386/isa/apic_ipl.s: splz() 246 */ 247 #define SCPL_LOCK \ 248 pushl $_cpl_lock ; \ 249 call _ss_lock ; \ 250 addl $4, %esp 251 252 #define SCPL_UNLOCK \ 253 pushl $_cpl_lock ; \ 254 call _ss_unlock ; \ 255 addl $4, %esp 256 257 #else /* SMP */ 258 259 #define MPLOCKED /* NOP */ 260 261 #define FPU_LOCK /* NOP */ 262 #define ALIGN_LOCK /* NOP */ 263 #define SYSCALL_LOCK /* NOP */ 264 #define ALTSYSCALL_LOCK /* NOP */ 265 266 #endif /* SMP */ 267 268 #else /* LOCORE */ 269 270 #ifdef SMP 271 272 /* 273 * Protects cpl/cil/ipending data as a critical region. 274 * 275 * Used in: 276 * sys/i386/isa/ipl_funcs.c: DO_SETBITS, softclockpending(), GENSPL, 277 * spl0(), splx(), splq() 278 */ 279 280 /* Bottom half */ 281 #define CPL_LOCK() s_lock(&cpl_lock) 282 #define CPL_UNLOCK() s_unlock(&cpl_lock) 283 284 /* INT safe version for top half of kernel */ 285 #define SCPL_LOCK() ss_lock(&cpl_lock) 286 #define SCPL_UNLOCK() ss_unlock(&cpl_lock) 287 288 /* 289 * Protects com/tty data as a critical region. 290 */ 291 #define COM_LOCK() s_lock(&com_lock) 292 #define COM_UNLOCK() s_unlock(&com_lock) 293 294 #else /* SMP */ 295 296 #define CPL_LOCK() 297 #define CPL_UNLOCK() 298 #define SCPL_LOCK() 299 #define SCPL_UNLOCK() 300 301 #define COM_LOCK() 302 #define COM_UNLOCK() 303 304 #endif /* SMP */ 305 306 /* 307 * A simple spin lock. 308 * 309 * This structure only sets one bit of data, but is sized based on the 310 * minimum word size that can be operated on by the hardware test-and-set 311 * instruction. It is only needed for multiprocessors, as uniprocessors 312 * will always run to completion or a sleep. It is an error to hold one 313 * of these locks while a process is sleeping. 314 */ 315 struct simplelock { 316 volatile int lock_data; 317 }; 318 319 /* functions in simplelock.s */ 320 void s_lock_init __P((struct simplelock *)); 321 void s_lock __P((struct simplelock *)); 322 int s_lock_try __P((struct simplelock *)); 323 void s_unlock __P((struct simplelock *)); 324 void ss_lock __P((struct simplelock *)); 325 void ss_unlock __P((struct simplelock *)); 326 327 /* global data in mp_machdep.c */ 328 extern struct simplelock imen_lock; 329 extern struct simplelock cpl_lock; 330 extern struct simplelock fast_intr_lock; 331 extern struct simplelock intr_lock; 332 extern struct simplelock com_lock; 333 334 #if !defined(SIMPLELOCK_DEBUG) && NCPUS > 1 335 /* 336 * The simple-lock routines are the primitives out of which the lock 337 * package is built. The machine-dependent code must implement an 338 * atomic test_and_set operation that indivisibly sets the simple lock 339 * to non-zero and returns its old value. It also assumes that the 340 * setting of the lock to zero below is indivisible. Simple locks may 341 * only be used for exclusive locks. 342 */ 343 344 #ifdef the_original_code 345 346 static __inline void 347 simple_lock_init(struct simplelock *lkp) 348 { 349 350 lkp->lock_data = 0; 351 } 352 353 static __inline void 354 simple_lock(struct simplelock *lkp) 355 { 356 357 while (test_and_set(&lkp->lock_data)) 358 continue; 359 } 360 361 static __inline int 362 simple_lock_try(struct simplelock *lkp) 363 { 364 365 return (!test_and_set(&lkp->lock_data)); 366 } 367 368 static __inline void 369 simple_unlock(struct simplelock *lkp) 370 { 371 372 lkp->lock_data = 0; 373 } 374 375 #else /* the_original_code */ 376 377 /* 378 * This set of defines turns on the real functions in i386/isa/apic_ipl.s. 379 * It has never actually been tested. 380 */ 381 #define simple_lock_init(alp) s_lock_init(alp) 382 #define simple_lock(alp) s_lock(alp) 383 #define simple_lock_try(alp) s_lock_try(alp) 384 #define simple_unlock(alp) s_unlock(alp) 385 386 #endif /* the_original_code */ 387 388 #endif /* NCPUS > 1 */ 389 #endif /* LOCORE */ 390 #endif /* !_SIMPLELOCK_H_ */ 391 392 #endif /* !_MACHINE_PARAM_H_ */ 393