Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mem.c
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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 * $FreeBSD: releng/5.1/sys/i386/i386/mem.c 113040 2003-04-03 23:44:35Z jake $ 42 */ 43 44 /* 45 * Memory special file 46 */ 47 48 #include <sys/param.h> 49 #include <sys/conf.h> 50 #include <sys/fcntl.h> 51 #include <sys/ioccom.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/memrange.h> 56 #include <sys/mutex.h> 57 #include <sys/proc.h> 58 #include <sys/signalvar.h> 59 #include <sys/systm.h> 60 #include <sys/uio.h> 61 62 #include <machine/db_machdep.h> 63 #include <machine/frame.h> 64 #include <machine/psl.h> 65 #include <machine/specialreg.h> 66 67 #include <vm/vm.h> 68 #include <vm/pmap.h> 69 #include <vm/vm_extern.h> 70 71 static dev_t memdev, kmemdev, iodev; 72 73 static d_open_t mmopen; 74 static d_close_t mmclose; 75 static d_read_t mmrw; 76 static d_ioctl_t mmioctl; 77 static d_mmap_t memmmap; 78 79 #define CDEV_MAJOR 2 80 static struct cdevsw mem_cdevsw = { 81 .d_open = mmopen, 82 .d_close = mmclose, 83 .d_read = mmrw, 84 .d_write = mmrw, 85 .d_ioctl = mmioctl, 86 .d_mmap = memmmap, 87 .d_name = "mem", 88 .d_maj = CDEV_MAJOR, 89 .d_flags = D_MEM, 90 }; 91 92 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 93 94 struct mem_range_softc mem_range_softc; 95 96 static int 97 mmclose(dev_t dev, int flags, int fmt, struct thread *td) 98 { 99 switch (minor(dev)) { 100 case 14: 101 td->td_frame->tf_eflags &= ~PSL_IOPL; 102 } 103 return (0); 104 } 105 106 static int 107 mmopen(dev_t dev, int flags, int fmt, struct thread *td) 108 { 109 int error; 110 111 switch (minor(dev)) { 112 case 0: 113 case 1: 114 if (flags & FWRITE) { 115 error = securelevel_gt(td->td_ucred, 0); 116 if (error != 0) 117 return (error); 118 } 119 break; 120 case 14: 121 error = suser(td); 122 if (error != 0) 123 return (error); 124 error = securelevel_gt(td->td_ucred, 0); 125 if (error != 0) 126 return (error); 127 td->td_frame->tf_eflags |= PSL_IOPL; 128 break; 129 } 130 return (0); 131 } 132 133 /*ARGSUSED*/ 134 static int 135 mmrw(dev_t dev, struct uio *uio, int flags) 136 { 137 int o; 138 u_int c = 0, v; 139 struct iovec *iov; 140 int error = 0; 141 vm_offset_t addr, eaddr; 142 143 GIANT_REQUIRED; 144 145 while (uio->uio_resid > 0 && error == 0) { 146 iov = uio->uio_iov; 147 if (iov->iov_len == 0) { 148 uio->uio_iov++; 149 uio->uio_iovcnt--; 150 if (uio->uio_iovcnt < 0) 151 panic("mmrw"); 152 continue; 153 } 154 switch (minor(dev)) { 155 156 /* minor device 0 is physical memory */ 157 case 0: 158 v = uio->uio_offset; 159 v &= ~PAGE_MASK; 160 pmap_kenter((vm_offset_t)ptvmmap, v); 161 o = (int)uio->uio_offset & PAGE_MASK; 162 c = (u_int)(PAGE_SIZE - ((int)iov->iov_base & PAGE_MASK)); 163 c = min(c, (u_int)(PAGE_SIZE - o)); 164 c = min(c, (u_int)iov->iov_len); 165 error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio); 166 pmap_qremove((vm_offset_t)ptvmmap, 1); 167 continue; 168 169 /* minor device 1 is kernel memory */ 170 case 1: 171 c = iov->iov_len; 172 173 /* 174 * Make sure that all of the pages are currently resident so 175 * that we don't create any zero-fill pages. 176 */ 177 addr = trunc_page(uio->uio_offset); 178 eaddr = round_page(uio->uio_offset + c); 179 180 if (addr < (vm_offset_t)VADDR(PTDPTDI, 0)) 181 return (EFAULT); 182 for (; addr < eaddr; addr += PAGE_SIZE) 183 if (pmap_extract(kernel_pmap, addr) == 0) 184 return (EFAULT); 185 186 if (!kernacc((caddr_t)(int)uio->uio_offset, c, 187 uio->uio_rw == UIO_READ ? 188 VM_PROT_READ : VM_PROT_WRITE)) 189 return (EFAULT); 190 error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio); 191 continue; 192 193 default: 194 return (ENODEV); 195 } 196 197 if (error) 198 break; 199 iov->iov_base = (char *)iov->iov_base + c; 200 iov->iov_len -= c; 201 uio->uio_offset += c; 202 uio->uio_resid -= c; 203 } 204 return (error); 205 } 206 207 /*******************************************************\ 208 * allow user processes to MMAP some memory sections * 209 * instead of going through read/write * 210 \*******************************************************/ 211 static int 212 memmmap(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr, int prot) 213 { 214 switch (minor(dev)) 215 { 216 217 /* minor device 0 is physical memory */ 218 case 0: 219 *paddr = offset; 220 break; 221 222 /* minor device 1 is kernel memory */ 223 case 1: 224 *paddr = vtophys(offset); 225 break; 226 227 default: 228 return (-1); 229 } 230 return (0); 231 } 232 233 /* 234 * Operations for changing memory attributes. 235 * 236 * This is basically just an ioctl shim for mem_range_attr_get 237 * and mem_range_attr_set. 238 */ 239 static int 240 mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 241 { 242 int nd, error = 0; 243 struct mem_range_op *mo = (struct mem_range_op *)data; 244 struct mem_range_desc *md; 245 246 /* is this for us? */ 247 if ((cmd != MEMRANGE_GET) && 248 (cmd != MEMRANGE_SET)) 249 return (ENOTTY); 250 251 /* any chance we can handle this? */ 252 if (mem_range_softc.mr_op == NULL) 253 return (EOPNOTSUPP); 254 255 /* do we have any descriptors? */ 256 if (mem_range_softc.mr_ndesc == 0) 257 return (ENXIO); 258 259 switch (cmd) { 260 case MEMRANGE_GET: 261 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 262 if (nd > 0) { 263 md = (struct mem_range_desc *) 264 malloc(nd * sizeof(struct mem_range_desc), 265 M_MEMDESC, M_WAITOK); 266 error = mem_range_attr_get(md, &nd); 267 if (!error) 268 error = copyout(md, mo->mo_desc, 269 nd * sizeof(struct mem_range_desc)); 270 free(md, M_MEMDESC); 271 } 272 else 273 nd = mem_range_softc.mr_ndesc; 274 mo->mo_arg[0] = nd; 275 break; 276 277 case MEMRANGE_SET: 278 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 279 M_MEMDESC, M_WAITOK); 280 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 281 /* clamp description string */ 282 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 283 if (error == 0) 284 error = mem_range_attr_set(md, &mo->mo_arg[0]); 285 free(md, M_MEMDESC); 286 break; 287 } 288 return (error); 289 } 290 291 /* 292 * Implementation-neutral, kernel-callable functions for manipulating 293 * memory range attributes. 294 */ 295 int 296 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 297 { 298 /* can we handle this? */ 299 if (mem_range_softc.mr_op == NULL) 300 return (EOPNOTSUPP); 301 302 if (*arg == 0) 303 *arg = mem_range_softc.mr_ndesc; 304 else 305 bcopy(mem_range_softc.mr_desc, mrd, 306 (*arg) * sizeof(struct mem_range_desc)); 307 return (0); 308 } 309 310 int 311 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 312 { 313 /* can we handle this? */ 314 if (mem_range_softc.mr_op == NULL) 315 return (EOPNOTSUPP); 316 317 return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); 318 } 319 320 #ifdef SMP 321 void 322 mem_range_AP_init(void) 323 { 324 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) 325 (mem_range_softc.mr_op->initAP(&mem_range_softc)); 326 } 327 #endif 328 329 static int 330 mem_modevent(module_t mod, int type, void *data) 331 { 332 switch(type) { 333 case MOD_LOAD: 334 if (bootverbose) 335 printf("mem: <memory & I/O>\n"); 336 /* Initialise memory range handling */ 337 if (mem_range_softc.mr_op != NULL) 338 mem_range_softc.mr_op->init(&mem_range_softc); 339 340 memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM, 341 0640, "mem"); 342 kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM, 343 0640, "kmem"); 344 iodev = make_dev(&mem_cdevsw, 14, UID_ROOT, GID_WHEEL, 345 0600, "io"); 346 return (0); 347 348 case MOD_UNLOAD: 349 destroy_dev(memdev); 350 destroy_dev(kmemdev); 351 destroy_dev(iodev); 352 return (0); 353 354 case MOD_SHUTDOWN: 355 return (0); 356 357 default: 358 return (EOPNOTSUPP); 359 } 360 } 361 362 DEV_MODULE(mem, mem_modevent, NULL);
Cache object: 5e98a16d00928e09655579fd99f0b7e3
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