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 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 /* 43 * Memory special file 44 */ 45 46 #include <sys/param.h> 47 #include <sys/conf.h> 48 #include <sys/fcntl.h> 49 #include <sys/ioccom.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/malloc.h> 53 #include <sys/memrange.h> 54 #include <sys/module.h> 55 #include <sys/mutex.h> 56 #include <sys/proc.h> 57 #include <sys/signalvar.h> 58 #include <sys/systm.h> 59 #include <sys/uio.h> 60 61 #include <machine/specialreg.h> 62 #include <machine/vmparam.h> 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_extern.h> 67 68 #include <machine/memdev.h> 69 70 /* 71 * Used in /dev/mem drivers and elsewhere 72 */ 73 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 74 struct mem_range_softc mem_range_softc; 75 76 void 77 mem_range_AP_init(void) 78 { 79 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) 80 mem_range_softc.mr_op->initAP(&mem_range_softc); 81 } 82 83 /* ARGSUSED */ 84 int 85 memrw(struct cdev *dev, struct uio *uio, int flags) 86 { 87 int o; 88 u_long c = 0, v; 89 struct iovec *iov; 90 int error = 0; 91 vm_offset_t addr, eaddr; 92 93 GIANT_REQUIRED; 94 95 while (uio->uio_resid > 0 && error == 0) { 96 iov = uio->uio_iov; 97 if (iov->iov_len == 0) { 98 uio->uio_iov++; 99 uio->uio_iovcnt--; 100 if (uio->uio_iovcnt < 0) 101 panic("memrw"); 102 continue; 103 } 104 if (minor(dev) == CDEV_MINOR_MEM) { 105 v = uio->uio_offset; 106 kmemphys: 107 o = v & PAGE_MASK; 108 c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o)); 109 error = uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio); 110 continue; 111 } 112 else if (minor(dev) == CDEV_MINOR_KMEM) { 113 v = uio->uio_offset; 114 115 if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) { 116 v = DMAP_TO_PHYS(v); 117 goto kmemphys; 118 } 119 120 c = iov->iov_len; 121 122 /* 123 * Make sure that all of the pages are currently 124 * resident so that we don't create any zero-fill 125 * pages. 126 */ 127 addr = trunc_page(v); 128 eaddr = round_page(v + c); 129 130 if (addr < (vm_offset_t)KERNBASE) 131 return (EFAULT); 132 for (; addr < eaddr; addr += PAGE_SIZE) 133 if (pmap_extract(kernel_pmap, addr) == 0) 134 return (EFAULT); 135 136 if (!kernacc((caddr_t)(long)v, c, 137 uio->uio_rw == UIO_READ ? 138 VM_PROT_READ : VM_PROT_WRITE)) 139 return (EFAULT); 140 141 error = uiomove((caddr_t)(long)v, (int)c, uio); 142 continue; 143 } 144 /* else panic! */ 145 } 146 return (error); 147 } 148 149 /* 150 * allow user processes to MMAP some memory sections 151 * instead of going through read/write 152 */ 153 /* ARGSUSED */ 154 int 155 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, 156 int prot __unused) 157 { 158 if (minor(dev) == CDEV_MINOR_MEM) 159 *paddr = offset; 160 else if (minor(dev) == CDEV_MINOR_KMEM) 161 *paddr = vtophys(offset); 162 /* else panic! */ 163 return (0); 164 } 165 166 /* 167 * Operations for changing memory attributes. 168 * 169 * This is basically just an ioctl shim for mem_range_attr_get 170 * and mem_range_attr_set. 171 */ 172 /* ARGSUSED */ 173 int 174 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 175 struct thread *td) 176 { 177 int nd, error = 0; 178 struct mem_range_op *mo = (struct mem_range_op *)data; 179 struct mem_range_desc *md; 180 181 /* is this for us? */ 182 if ((cmd != MEMRANGE_GET) && 183 (cmd != MEMRANGE_SET)) 184 return (ENOTTY); 185 186 /* any chance we can handle this? */ 187 if (mem_range_softc.mr_op == NULL) 188 return (EOPNOTSUPP); 189 190 /* do we have any descriptors? */ 191 if (mem_range_softc.mr_ndesc == 0) 192 return (ENXIO); 193 194 switch (cmd) { 195 case MEMRANGE_GET: 196 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 197 if (nd > 0) { 198 md = (struct mem_range_desc *) 199 malloc(nd * sizeof(struct mem_range_desc), 200 M_MEMDESC, M_WAITOK); 201 error = mem_range_attr_get(md, &nd); 202 if (!error) 203 error = copyout(md, mo->mo_desc, 204 nd * sizeof(struct mem_range_desc)); 205 free(md, M_MEMDESC); 206 } 207 else 208 nd = mem_range_softc.mr_ndesc; 209 mo->mo_arg[0] = nd; 210 break; 211 212 case MEMRANGE_SET: 213 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 214 M_MEMDESC, M_WAITOK); 215 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 216 /* clamp description string */ 217 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 218 if (error == 0) 219 error = mem_range_attr_set(md, &mo->mo_arg[0]); 220 free(md, M_MEMDESC); 221 break; 222 } 223 return (error); 224 } 225 226 /* 227 * Implementation-neutral, kernel-callable functions for manipulating 228 * memory range attributes. 229 */ 230 int 231 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 232 { 233 /* can we handle this? */ 234 if (mem_range_softc.mr_op == NULL) 235 return (EOPNOTSUPP); 236 237 if (*arg == 0) 238 *arg = mem_range_softc.mr_ndesc; 239 else 240 bcopy(mem_range_softc.mr_desc, mrd, 241 (*arg) * sizeof(struct mem_range_desc)); 242 return (0); 243 } 244 245 int 246 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 247 { 248 /* can we handle this? */ 249 if (mem_range_softc.mr_op == NULL) 250 return (EOPNOTSUPP); 251 252 return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); 253 } 254 255 void 256 dev_mem_md_init(void) 257 { 258 if (mem_range_softc.mr_op != NULL) 259 mem_range_softc.mr_op->init(&mem_range_softc); 260 } 261