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 /* ARGSUSED */ 76 int 77 memrw(struct cdev *dev, struct uio *uio, int flags) 78 { 79 struct iovec *iov; 80 u_long c, v, vd; 81 int error, o, sflags; 82 vm_offset_t addr, eaddr; 83 84 error = 0; 85 c = 0; 86 sflags = curthread_pflags_set(TDP_DEVMEMIO); 87 while (uio->uio_resid > 0 && error == 0) { 88 iov = uio->uio_iov; 89 if (iov->iov_len == 0) { 90 uio->uio_iov++; 91 uio->uio_iovcnt--; 92 if (uio->uio_iovcnt < 0) 93 panic("memrw"); 94 continue; 95 } 96 if (dev2unit(dev) == CDEV_MINOR_MEM) { 97 v = uio->uio_offset; 98 kmemphys: 99 o = v & PAGE_MASK; 100 c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o)); 101 vd = PHYS_TO_DMAP_RAW(v); 102 if (vd < DMAP_MIN_ADDRESS || 103 (vd > DMAP_MIN_ADDRESS + dmaplimit && 104 vd <= DMAP_MAX_ADDRESS) || 105 (pmap_kextract(vd) == 0 && (v & PG_FRAME) != 0)) { 106 error = EFAULT; 107 goto ret; 108 } 109 error = uiomove((void *)vd, (int)c, uio); 110 continue; 111 } else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 112 v = uio->uio_offset; 113 114 if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) { 115 v = DMAP_TO_PHYS_RAW(v); 116 goto kmemphys; 117 } 118 119 c = iov->iov_len; 120 121 /* 122 * Make sure that all of the pages are currently 123 * resident so that we don't create any zero-fill 124 * pages. 125 */ 126 addr = trunc_page(v); 127 eaddr = round_page(v + c); 128 129 if (addr < VM_MIN_KERNEL_ADDRESS) { 130 error = EFAULT; 131 goto ret; 132 } 133 for (; addr < eaddr; addr += PAGE_SIZE) { 134 if (pmap_extract(kernel_pmap, addr) == 0) { 135 error = EFAULT; 136 goto ret; 137 } 138 } 139 if (!kernacc((caddr_t)(long)v, c, 140 uio->uio_rw == UIO_READ ? 141 VM_PROT_READ : VM_PROT_WRITE)) { 142 error = EFAULT; 143 goto ret; 144 } 145 146 error = uiomove((caddr_t)(long)v, (int)c, uio); 147 continue; 148 } 149 /* else panic! */ 150 } 151 ret: 152 curthread_pflags_restore(sflags); 153 return (error); 154 } 155 156 /* 157 * allow user processes to MMAP some memory sections 158 * instead of going through read/write 159 */ 160 /* ARGSUSED */ 161 int 162 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 163 int prot __unused, vm_memattr_t *memattr __unused) 164 { 165 if (dev2unit(dev) == CDEV_MINOR_MEM) 166 *paddr = offset; 167 else if (dev2unit(dev) == CDEV_MINOR_KMEM) 168 *paddr = vtophys(offset); 169 /* else panic! */ 170 return (0); 171 } 172 173 /* 174 * Operations for changing memory attributes. 175 * 176 * This is basically just an ioctl shim for mem_range_attr_get 177 * and mem_range_attr_set. 178 */ 179 /* ARGSUSED */ 180 int 181 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 182 struct thread *td) 183 { 184 int nd, error = 0; 185 struct mem_range_op *mo = (struct mem_range_op *)data; 186 struct mem_range_desc *md; 187 188 /* is this for us? */ 189 if ((cmd != MEMRANGE_GET) && 190 (cmd != MEMRANGE_SET)) 191 return (ENOTTY); 192 193 /* any chance we can handle this? */ 194 if (mem_range_softc.mr_op == NULL) 195 return (EOPNOTSUPP); 196 197 /* do we have any descriptors? */ 198 if (mem_range_softc.mr_ndesc == 0) 199 return (ENXIO); 200 201 switch (cmd) { 202 case MEMRANGE_GET: 203 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 204 if (nd > 0) { 205 md = (struct mem_range_desc *) 206 malloc(nd * sizeof(struct mem_range_desc), 207 M_MEMDESC, M_WAITOK); 208 error = mem_range_attr_get(md, &nd); 209 if (!error) 210 error = copyout(md, mo->mo_desc, 211 nd * sizeof(struct mem_range_desc)); 212 free(md, M_MEMDESC); 213 } 214 else 215 nd = mem_range_softc.mr_ndesc; 216 mo->mo_arg[0] = nd; 217 break; 218 219 case MEMRANGE_SET: 220 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 221 M_MEMDESC, M_WAITOK); 222 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 223 /* clamp description string */ 224 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 225 if (error == 0) 226 error = mem_range_attr_set(md, &mo->mo_arg[0]); 227 free(md, M_MEMDESC); 228 break; 229 } 230 return (error); 231 } 232