1 /*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4 * 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 code derived from software contributed to 9 * Berkeley by William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 40 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 41 * $Id: mem.c,v 1.16 1995/10/29 11:37:56 bde Exp $ 42 */ 43 44 /* 45 * Memory special file 46 */ 47 48 #include <sys/param.h> 49 #include <sys/conf.h> 50 #include <sys/buf.h> 51 #include <sys/systm.h> 52 #include <sys/uio.h> 53 #include <sys/malloc.h> 54 #include <sys/proc.h> 55 56 #include <machine/cpu.h> 57 #include <machine/random.h> 58 #include <machine/psl.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_param.h> 62 #include <vm/lock.h> 63 #include <vm/vm_prot.h> 64 #include <vm/pmap.h> 65 66 #ifdef DEVFS 67 #include <sys/devfsext.h> 68 #include "sys/kernel.h" 69 int mmopen(); 70 71 void memdev_init(void *data) /* data not used */ 72 { 73 void * x; 74 /* path name devsw minor type uid gid perm*/ 75 x=dev_add("/misc", "mem", mmopen, 0, DV_CHR, 0, 2, 0640); 76 x=dev_add("/misc", "kmem", mmopen, 1, DV_CHR, 0, 2, 0640); 77 x=dev_add("/misc", "null", mmopen, 2, DV_CHR, 0, 0, 0666); 78 #ifdef DEVRANDOM 79 x=dev_add("/misc", "random", mmopen, 3, DV_CHR, 0, 0, 0666); 80 x=dev_add("/misc", "urandom", mmopen, 4, DV_CHR, 0, 0, 0666); 81 #endif 82 x=dev_add("/misc", "zero", mmopen, 12, DV_CHR, 0, 0, 0666); 83 x=dev_add("/misc", "io", mmopen, 14, DV_CHR, 0, 2, 0640); 84 } 85 SYSINIT(memdev,SI_SUB_DEVFS, SI_ORDER_ANY, memdev_init, NULL) 86 #endif /*DEVFS*/ 87 88 89 90 extern char *ptvmmap; /* poor name! */ 91 /*ARGSUSED*/ 92 int 93 mmclose(dev, flags, fmt, p) 94 dev_t dev; 95 int flags; 96 int fmt; 97 struct proc *p; 98 { 99 struct trapframe *fp; 100 101 switch (minor(dev)) { 102 case 14: 103 fp = (struct trapframe *)curproc->p_md.md_regs; 104 fp->tf_eflags &= ~PSL_IOPL; 105 break; 106 default: 107 break; 108 } 109 return(0); 110 } 111 /*ARGSUSED*/ 112 int 113 mmopen(dev, flags, fmt, p) 114 dev_t dev; 115 int flags; 116 int fmt; 117 struct proc *p; 118 { 119 struct trapframe *fp; 120 121 switch (minor(dev)) { 122 case 14: 123 fp = (struct trapframe *)curproc->p_md.md_regs; 124 fp->tf_eflags |= PSL_IOPL; 125 break; 126 default: 127 break; 128 } 129 return(0); 130 } 131 /*ARGSUSED*/ 132 int 133 mmrw(dev, uio, flags) 134 dev_t dev; 135 struct uio *uio; 136 int flags; 137 { 138 register int o; 139 register u_int c, v; 140 #ifdef DEVRANDOM 141 u_int poolsize; 142 #endif 143 register struct iovec *iov; 144 int error = 0; 145 caddr_t buf = NULL; 146 147 while (uio->uio_resid > 0 && error == 0) { 148 iov = uio->uio_iov; 149 if (iov->iov_len == 0) { 150 uio->uio_iov++; 151 uio->uio_iovcnt--; 152 if (uio->uio_iovcnt < 0) 153 panic("mmrw"); 154 continue; 155 } 156 switch (minor(dev)) { 157 158 /* minor device 0 is physical memory */ 159 case 0: 160 v = uio->uio_offset; 161 pmap_enter(kernel_pmap, (vm_offset_t)ptvmmap, v, 162 uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE, 163 TRUE); 164 o = (int)uio->uio_offset & PGOFSET; 165 c = (u_int)(NBPG - ((int)iov->iov_base & PGOFSET)); 166 c = min(c, (u_int)(NBPG - o)); 167 c = min(c, (u_int)iov->iov_len); 168 error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio); 169 pmap_remove(kernel_pmap, (vm_offset_t)ptvmmap, 170 (vm_offset_t)&ptvmmap[NBPG]); 171 continue; 172 173 /* minor device 1 is kernel memory */ 174 case 1: { 175 vm_offset_t addr, eaddr; 176 c = iov->iov_len; 177 178 /* 179 * Make sure that all of the pages are currently resident so 180 * that we don't create any zero-fill pages. 181 */ 182 addr = trunc_page(uio->uio_offset); 183 eaddr = round_page(uio->uio_offset + c); 184 for (; addr < eaddr; addr += PAGE_SIZE) 185 if (pmap_extract(kernel_pmap, addr) == 0) 186 return EFAULT; 187 188 if (!kernacc((caddr_t)(int)uio->uio_offset, c, 189 uio->uio_rw == UIO_READ ? B_READ : B_WRITE)) 190 return(EFAULT); 191 error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio); 192 continue; 193 } 194 195 /* minor device 2 is EOF/RATHOLE */ 196 case 2: 197 if (uio->uio_rw == UIO_READ) 198 return (0); 199 c = iov->iov_len; 200 break; 201 202 #ifdef DEVRANDOM 203 /* minor device 3 (/dev/random) is source of filth on read, rathole on write */ 204 case 3: 205 if (uio->uio_rw == UIO_WRITE) { 206 c = iov->iov_len; 207 break; 208 } 209 if (buf == NULL) 210 buf = (caddr_t) 211 malloc(CLBYTES, M_TEMP, M_WAITOK); 212 c = min(iov->iov_len, CLBYTES); 213 poolsize = read_random(buf, c); 214 if (poolsize == 0) { 215 if (buf) 216 free(buf, M_TEMP); 217 return (0); 218 } 219 c = min(c, poolsize); 220 error = uiomove(buf, (int)c, uio); 221 continue; 222 223 /* minor device 4 (/dev/urandom) is source of muck on read, rathole on write */ 224 case 4: 225 if (uio->uio_rw == UIO_WRITE) { 226 c = iov->iov_len; 227 break; 228 } 229 if (buf == NULL) 230 buf = (caddr_t) 231 malloc(CLBYTES, M_TEMP, M_WAITOK); 232 c = min(iov->iov_len, CLBYTES); 233 poolsize = read_random_unlimited(buf, c); 234 c = min(c, poolsize); 235 error = uiomove(buf, (int)c, uio); 236 continue; 237 #endif 238 239 /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */ 240 case 12: 241 if (uio->uio_rw == UIO_WRITE) { 242 c = iov->iov_len; 243 break; 244 } 245 if (buf == NULL) { 246 buf = (caddr_t) 247 malloc(CLBYTES, M_TEMP, M_WAITOK); 248 bzero(buf, CLBYTES); 249 } 250 c = min(iov->iov_len, CLBYTES); 251 error = uiomove(buf, (int)c, uio); 252 continue; 253 254 #ifdef notyet 255 /* 386 I/O address space (/dev/ioport[bwl]) is a read/write access to seperate 256 i/o device address bus, different than memory bus. Semantics here are 257 very different than ordinary read/write, as if iov_len is a multiple 258 an implied string move from a single port will be done. Note that lseek 259 must be used to set the port number reliably. */ 260 case 14: 261 if (iov->iov_len == 1) { 262 u_char tmp; 263 tmp = inb(uio->uio_offset); 264 error = uiomove (&tmp, iov->iov_len, uio); 265 } else { 266 if (!useracc((caddr_t)iov->iov_base, 267 iov->iov_len, uio->uio_rw)) 268 return (EFAULT); 269 insb(uio->uio_offset, iov->iov_base, 270 iov->iov_len); 271 } 272 break; 273 case 15: 274 if (iov->iov_len == sizeof (short)) { 275 u_short tmp; 276 tmp = inw(uio->uio_offset); 277 error = uiomove (&tmp, iov->iov_len, uio); 278 } else { 279 if (!useracc((caddr_t)iov->iov_base, 280 iov->iov_len, uio->uio_rw)) 281 return (EFAULT); 282 insw(uio->uio_offset, iov->iov_base, 283 iov->iov_len/ sizeof (short)); 284 } 285 break; 286 case 16: 287 if (iov->iov_len == sizeof (long)) { 288 u_long tmp; 289 tmp = inl(uio->uio_offset); 290 error = uiomove (&tmp, iov->iov_len, uio); 291 } else { 292 if (!useracc((caddr_t)iov->iov_base, 293 iov->iov_len, uio->uio_rw)) 294 return (EFAULT); 295 insl(uio->uio_offset, iov->iov_base, 296 iov->iov_len/ sizeof (long)); 297 } 298 break; 299 #endif 300 301 default: 302 return (ENXIO); 303 } 304 if (error) 305 break; 306 iov->iov_base += c; 307 iov->iov_len -= c; 308 uio->uio_offset += c; 309 uio->uio_resid -= c; 310 } 311 if (buf) 312 free(buf, M_TEMP); 313 return (error); 314 } 315 316 317 318 319 /*******************************************************\ 320 * allow user processes to MMAP some memory sections * 321 * instead of going through read/write * 322 \*******************************************************/ 323 int memmmap(dev_t dev, int offset, int nprot) 324 { 325 switch (minor(dev)) 326 { 327 328 /* minor device 0 is physical memory */ 329 case 0: 330 return i386_btop(offset); 331 332 /* minor device 1 is kernel memory */ 333 case 1: 334 return i386_btop(vtophys(offset)); 335 336 default: 337 return -1; 338 } 339 } 340 341 /* 342 * Allow userland to select which interrupts will be used in the muck 343 * gathering business. 344 */ 345 int 346 mmioctl(dev, cmd, cmdarg, flags, p) 347 dev_t dev; 348 int cmd; 349 caddr_t cmdarg; 350 int flags; 351 struct proc *p; 352 { 353 #ifdef DEVRANDOM 354 int error; 355 356 if (minor(dev) != 3 && minor(dev) != 4) 357 return (ENODEV); 358 359 if (*(u_int16_t *)cmdarg >= 16) 360 return (EINVAL); 361 362 /* Only root can do this */ 363 error = suser(p->p_ucred, &p->p_acflag); 364 if (error != 0) { 365 return (error); 366 } 367 368 switch (cmd){ 369 370 case MEM_SETIRQ: 371 interrupt_allowed |= 1 << *(u_int16_t *)cmdarg; 372 break; 373 374 case MEM_CLEARIRQ: 375 interrupt_allowed &= ~(1 << *(u_int16_t *)cmdarg); 376 break; 377 378 case MEM_RETURNIRQ: 379 *(u_int16_t *)cmdarg = interrupt_allowed; 380 break; 381 382 default: 383 return (ENOTTY); 384 } 385 return (0); 386 #else 387 return (ENODEV); 388 #endif /* DEVRANDOM */ 389 } 390