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 75 struct mem_range_softc mem_range_softc; 76 77 /* ARGSUSED */ 78 int 79 memrw(struct cdev *dev, struct uio *uio, int flags) 80 { 81 int o; 82 u_long c = 0, v; 83 struct iovec *iov; 84 int error = 0; 85 vm_offset_t addr, eaddr; 86 87 GIANT_REQUIRED; 88 89 while (uio->uio_resid > 0 && error == 0) { 90 iov = uio->uio_iov; 91 if (iov->iov_len == 0) { 92 uio->uio_iov++; 93 uio->uio_iovcnt--; 94 if (uio->uio_iovcnt < 0) 95 panic("memrw"); 96 continue; 97 } 98 if (dev2unit(dev) == CDEV_MINOR_MEM) { 99 v = uio->uio_offset; 100 kmemphys: 101 o = v & PAGE_MASK; 102 c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o)); 103 error = uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio); 104 continue; 105 } 106 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 107 v = uio->uio_offset; 108 109 if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) { 110 v = DMAP_TO_PHYS(v); 111 goto kmemphys; 112 } 113 114 c = iov->iov_len; 115 116 /* 117 * Make sure that all of the pages are currently 118 * resident so that we don't create any zero-fill 119 * pages. 120 */ 121 addr = trunc_page(v); 122 eaddr = round_page(v + c); 123 124 if (addr < VM_MIN_KERNEL_ADDRESS) 125 return (EFAULT); 126 for (; addr < eaddr; addr += PAGE_SIZE) 127 if (pmap_extract(kernel_pmap, addr) == 0) 128 return (EFAULT); 129 130 if (!kernacc((caddr_t)(long)v, c, 131 uio->uio_rw == UIO_READ ? 132 VM_PROT_READ : VM_PROT_WRITE)) 133 return (EFAULT); 134 135 error = uiomove((caddr_t)(long)v, (int)c, uio); 136 continue; 137 } 138 /* else panic! */ 139 } 140 return (error); 141 } 142 143 /* 144 * allow user processes to MMAP some memory sections 145 * instead of going through read/write 146 */ 147 /* ARGSUSED */ 148 int 149 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 150 int prot __unused, vm_memattr_t *memattr __unused) 151 { 152 if (dev2unit(dev) == CDEV_MINOR_MEM) 153 *paddr = offset; 154 else if (dev2unit(dev) == CDEV_MINOR_KMEM) 155 *paddr = vtophys(offset); 156 /* else panic! */ 157 return (0); 158 } 159 160 /* 161 * Operations for changing memory attributes. 162 * 163 * This is basically just an ioctl shim for mem_range_attr_get 164 * and mem_range_attr_set. 165 */ 166 /* ARGSUSED */ 167 int 168 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 169 struct thread *td) 170 { 171 int nd, error = 0; 172 struct mem_range_op *mo = (struct mem_range_op *)data; 173 struct mem_range_desc *md; 174 175 /* is this for us? */ 176 if ((cmd != MEMRANGE_GET) && 177 (cmd != MEMRANGE_SET)) 178 return (ENOTTY); 179 180 /* any chance we can handle this? */ 181 if (mem_range_softc.mr_op == NULL) 182 return (EOPNOTSUPP); 183 184 /* do we have any descriptors? */ 185 if (mem_range_softc.mr_ndesc == 0) 186 return (ENXIO); 187 188 switch (cmd) { 189 case MEMRANGE_GET: 190 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 191 if (nd > 0) { 192 md = (struct mem_range_desc *) 193 malloc(nd * sizeof(struct mem_range_desc), 194 M_MEMDESC, M_WAITOK); 195 error = mem_range_attr_get(md, &nd); 196 if (!error) 197 error = copyout(md, mo->mo_desc, 198 nd * sizeof(struct mem_range_desc)); 199 free(md, M_MEMDESC); 200 } 201 else 202 nd = mem_range_softc.mr_ndesc; 203 mo->mo_arg[0] = nd; 204 break; 205 206 case MEMRANGE_SET: 207 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 208 M_MEMDESC, M_WAITOK); 209 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 210 /* clamp description string */ 211 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 212 if (error == 0) 213 error = mem_range_attr_set(md, &mo->mo_arg[0]); 214 free(md, M_MEMDESC); 215 break; 216 } 217 return (error); 218 } 219