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 /* 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 /* ARGSUSED */ 141 int 142 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, 143 int prot __unused) 144 { 145 if (minor(dev) == CDEV_MINOR_MEM) 146 *paddr = offset; 147 else if (minor(dev) == CDEV_MINOR_KMEM) 148 *paddr = vtophys(offset); 149 /* else panic! */ 150 return (0); 151 } 152 153 /* 154 * Operations for changing memory attributes. 155 * 156 * This is basically just an ioctl shim for mem_range_attr_get 157 * and mem_range_attr_set. 158 */ 159 /* ARGSUSED */ 160 int 161 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 162 struct thread *td) 163 { 164 int nd, error = 0; 165 struct mem_range_op *mo = (struct mem_range_op *)data; 166 struct mem_range_desc *md; 167 168 /* is this for us? */ 169 if ((cmd != MEMRANGE_GET) && 170 (cmd != MEMRANGE_SET)) 171 return (ENOTTY); 172 173 /* any chance we can handle this? */ 174 if (mem_range_softc.mr_op == NULL) 175 return (EOPNOTSUPP); 176 177 /* do we have any descriptors? */ 178 if (mem_range_softc.mr_ndesc == 0) 179 return (ENXIO); 180 181 switch (cmd) { 182 case MEMRANGE_GET: 183 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 184 if (nd > 0) { 185 md = (struct mem_range_desc *) 186 malloc(nd * sizeof(struct mem_range_desc), 187 M_MEMDESC, M_WAITOK); 188 error = mem_range_attr_get(md, &nd); 189 if (!error) 190 error = copyout(md, mo->mo_desc, 191 nd * sizeof(struct mem_range_desc)); 192 free(md, M_MEMDESC); 193 } 194 else 195 nd = mem_range_softc.mr_ndesc; 196 mo->mo_arg[0] = nd; 197 break; 198 199 case MEMRANGE_SET: 200 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 201 M_MEMDESC, M_WAITOK); 202 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 203 /* clamp description string */ 204 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 205 if (error == 0) 206 error = mem_range_attr_set(md, &mo->mo_arg[0]); 207 free(md, M_MEMDESC); 208 break; 209 } 210 return (error); 211 } 212 213 void 214 dev_mem_md_init(void) 215 { 216 if (mem_range_softc.mr_op != NULL) 217 mem_range_softc.mr_op->init(&mem_range_softc); 218 } 219