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/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/memrange.h> 53 #include <sys/module.h> 54 #include <sys/mutex.h> 55 #include <sys/proc.h> 56 #include <sys/signalvar.h> 57 #include <sys/systm.h> 58 #include <sys/uio.h> 59 60 #include <machine/specialreg.h> 61 62 #include <vm/vm.h> 63 #include <vm/pmap.h> 64 #include <vm/vm_extern.h> 65 66 #include <machine/memdev.h> 67 68 struct mem_range_softc mem_range_softc; 69 70 /* ARGSUSED */ 71 int 72 memrw(struct cdev *dev, struct uio *uio, int flags) 73 { 74 int o; 75 u_long c = 0, v; 76 struct iovec *iov; 77 int error = 0; 78 vm_offset_t addr, eaddr; 79 80 GIANT_REQUIRED; 81 82 while (uio->uio_resid > 0 && error == 0) { 83 iov = uio->uio_iov; 84 if (iov->iov_len == 0) { 85 uio->uio_iov++; 86 uio->uio_iovcnt--; 87 if (uio->uio_iovcnt < 0) 88 panic("memrw"); 89 continue; 90 } 91 if (minor(dev) == CDEV_MINOR_MEM) { 92 v = uio->uio_offset; 93 kmemphys: 94 o = v & PAGE_MASK; 95 c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o)); 96 error = uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio); 97 continue; 98 } 99 else if (minor(dev) == CDEV_MINOR_KMEM) { 100 v = uio->uio_offset; 101 102 if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) { 103 v = DMAP_TO_PHYS(v); 104 goto kmemphys; 105 } 106 107 c = iov->iov_len; 108 109 /* 110 * Make sure that all of the pages are currently 111 * resident so that we don't create any zero-fill 112 * pages. 113 */ 114 addr = trunc_page(v); 115 eaddr = round_page(v + c); 116 117 if (addr < (vm_offset_t)KERNBASE) 118 return (EFAULT); 119 for (; addr < eaddr; addr += PAGE_SIZE) 120 if (pmap_extract(kernel_pmap, addr) == 0) 121 return (EFAULT); 122 123 if (!kernacc((caddr_t)(long)v, c, 124 uio->uio_rw == UIO_READ ? 125 VM_PROT_READ : VM_PROT_WRITE)) 126 return (EFAULT); 127 128 error = uiomove((caddr_t)(long)v, (int)c, uio); 129 continue; 130 } 131 /* else panic! */ 132 } 133 return (error); 134 } 135 136 /* 137 * allow user processes to MMAP some memory sections 138 * instead of going through read/write 139 */ 140 int 141 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot) 142 { 143 if (minor(dev) == CDEV_MINOR_MEM) 144 *paddr = offset; 145 else if (minor(dev) == CDEV_MINOR_KMEM) 146 *paddr = vtophys(offset); 147 /* else panic! */ 148 return (0); 149 } 150 151 /* 152 * Operations for changing memory attributes. 153 * 154 * This is basically just an ioctl shim for mem_range_attr_get 155 * and mem_range_attr_set. 156 */ 157 int 158 memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, 159 struct thread *td) 160 { 161 int nd, error = 0; 162 struct mem_range_op *mo = (struct mem_range_op *)data; 163 struct mem_range_desc *md; 164 165 /* is this for us? */ 166 if ((cmd != MEMRANGE_GET) && 167 (cmd != MEMRANGE_SET)) 168 return (ENOTTY); 169 170 /* any chance we can handle this? */ 171 if (mem_range_softc.mr_op == NULL) 172 return (EOPNOTSUPP); 173 174 /* do we have any descriptors? */ 175 if (mem_range_softc.mr_ndesc == 0) 176 return (ENXIO); 177 178 switch (cmd) { 179 case MEMRANGE_GET: 180 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 181 if (nd > 0) { 182 md = (struct mem_range_desc *) 183 malloc(nd * sizeof(struct mem_range_desc), 184 M_MEMDESC, M_WAITOK); 185 error = mem_range_attr_get(md, &nd); 186 if (!error) 187 error = copyout(md, mo->mo_desc, 188 nd * sizeof(struct mem_range_desc)); 189 free(md, M_MEMDESC); 190 } 191 else 192 nd = mem_range_softc.mr_ndesc; 193 mo->mo_arg[0] = nd; 194 break; 195 196 case MEMRANGE_SET: 197 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 198 M_MEMDESC, M_WAITOK); 199 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 200 /* clamp description string */ 201 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 202 if (error == 0) 203 error = mem_range_attr_set(md, &mo->mo_arg[0]); 204 free(md, M_MEMDESC); 205 break; 206 } 207 return (error); 208 } 209 210 /* 211 * Implementation-neutral, kernel-callable functions for manipulating 212 * memory range attributes. 213 */ 214 int 215 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 216 { 217 /* can we handle this? */ 218 if (mem_range_softc.mr_op == NULL) 219 return (EOPNOTSUPP); 220 221 if (*arg == 0) 222 *arg = mem_range_softc.mr_ndesc; 223 else 224 bcopy(mem_range_softc.mr_desc, mrd, 225 (*arg) * sizeof(struct mem_range_desc)); 226 return (0); 227 } 228 229 int 230 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 231 { 232 /* can we handle this? */ 233 if (mem_range_softc.mr_op == NULL) 234 return (EOPNOTSUPP); 235 236 return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); 237 } 238 239 #ifdef SMP 240 void 241 mem_range_AP_init(void) 242 { 243 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) 244 (mem_range_softc.mr_op->initAP(&mem_range_softc)); 245 } 246 #endif 247 248 void 249 dev_mem_md_init(void) 250 { 251 if (mem_range_softc.mr_op != NULL) 252 mem_range_softc.mr_op->init(&mem_range_softc); 253 } 254