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/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/ioccom.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/msgbuf.h> 58 #include <sys/systm.h> 59 #include <sys/signalvar.h> 60 #include <sys/uio.h> 61 62 #include <machine/md_var.h> 63 #include <machine/vmparam.h> 64 65 #include <vm/vm.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vm_page.h> 69 70 #include <machine/memdev.h> 71 72 static void ppc_mrinit(struct mem_range_softc *); 73 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *); 74 75 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 76 77 static struct mem_range_ops ppc_mem_range_ops = { 78 ppc_mrinit, 79 ppc_mrset, 80 NULL, 81 NULL 82 }; 83 struct mem_range_softc mem_range_softc = { 84 &ppc_mem_range_ops, 85 0, 0, NULL 86 }; 87 88 /* ARGSUSED */ 89 int 90 memrw(struct cdev *dev, struct uio *uio, int flags) 91 { 92 struct iovec *iov; 93 int error = 0; 94 vm_offset_t va, eva, off, v; 95 vm_prot_t prot; 96 struct vm_page m; 97 vm_page_t marr; 98 vm_size_t cnt; 99 100 cnt = 0; 101 error = 0; 102 103 while (uio->uio_resid > 0 && !error) { 104 iov = uio->uio_iov; 105 if (iov->iov_len == 0) { 106 uio->uio_iov++; 107 uio->uio_iovcnt--; 108 if (uio->uio_iovcnt < 0) 109 panic("memrw"); 110 continue; 111 } 112 if (dev2unit(dev) == CDEV_MINOR_MEM) { 113 kmem_direct_mapped: v = uio->uio_offset; 114 115 off = uio->uio_offset & PAGE_MASK; 116 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 117 PAGE_MASK); 118 cnt = min(cnt, PAGE_SIZE - off); 119 cnt = min(cnt, iov->iov_len); 120 121 if (mem_valid(v, cnt)) { 122 error = EFAULT; 123 break; 124 } 125 126 if (!pmap_dev_direct_mapped(v, cnt)) { 127 error = uiomove((void *)v, cnt, uio); 128 } else { 129 m.phys_addr = trunc_page(v); 130 marr = &m; 131 error = uiomove_fromphys(&marr, off, cnt, uio); 132 } 133 } 134 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 135 va = uio->uio_offset; 136 137 if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end)) 138 goto kmem_direct_mapped; 139 140 va = trunc_page(uio->uio_offset); 141 eva = round_page(uio->uio_offset 142 + iov->iov_len); 143 144 /* 145 * Make sure that all the pages are currently resident 146 * so that we don't create any zero-fill pages. 147 */ 148 149 for (; va < eva; va += PAGE_SIZE) 150 if (pmap_extract(kernel_pmap, va) == 0) 151 return (EFAULT); 152 153 prot = (uio->uio_rw == UIO_READ) 154 ? VM_PROT_READ : VM_PROT_WRITE; 155 156 va = uio->uio_offset; 157 if (kernacc((void *) va, iov->iov_len, prot) 158 == FALSE) 159 return (EFAULT); 160 161 error = uiomove((void *)va, iov->iov_len, uio); 162 163 continue; 164 } 165 } 166 167 return (error); 168 } 169 170 /* 171 * allow user processes to MMAP some memory sections 172 * instead of going through read/write 173 */ 174 int 175 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 176 int prot, vm_memattr_t *memattr) 177 { 178 int i; 179 180 if (dev2unit(dev) == CDEV_MINOR_MEM) 181 *paddr = offset; 182 else if (dev2unit(dev) == CDEV_MINOR_KMEM) 183 *paddr = vtophys(offset); 184 else 185 return (EFAULT); 186 187 for (i = 0; i < mem_range_softc.mr_ndesc; i++) { 188 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE)) 189 continue; 190 191 if (offset >= mem_range_softc.mr_desc[i].mr_base && 192 offset < mem_range_softc.mr_desc[i].mr_base + 193 mem_range_softc.mr_desc[i].mr_len) { 194 switch (mem_range_softc.mr_desc[i].mr_flags & 195 MDF_ATTRMASK) { 196 case MDF_WRITEBACK: 197 *memattr = VM_MEMATTR_WRITE_BACK; 198 break; 199 case MDF_WRITECOMBINE: 200 *memattr = VM_MEMATTR_WRITE_COMBINING; 201 break; 202 case MDF_UNCACHEABLE: 203 *memattr = VM_MEMATTR_UNCACHEABLE; 204 break; 205 case MDF_WRITETHROUGH: 206 *memattr = VM_MEMATTR_WRITE_THROUGH; 207 break; 208 } 209 210 break; 211 } 212 } 213 214 return (0); 215 } 216 217 static void 218 ppc_mrinit(struct mem_range_softc *sc) 219 { 220 sc->mr_cap = 0; 221 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */ 222 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), 223 M_MEMDESC, M_WAITOK | M_ZERO); 224 } 225 226 static int 227 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) 228 { 229 int i; 230 231 switch(*arg) { 232 case MEMRANGE_SET_UPDATE: 233 for (i = 0; i < sc->mr_ndesc; i++) { 234 if (!sc->mr_desc[i].mr_len) { 235 sc->mr_desc[i] = *desc; 236 sc->mr_desc[i].mr_flags |= MDF_ACTIVE; 237 return (0); 238 } 239 if (sc->mr_desc[i].mr_base == desc->mr_base && 240 sc->mr_desc[i].mr_len == desc->mr_len) 241 return (EEXIST); 242 } 243 return (ENOSPC); 244 case MEMRANGE_SET_REMOVE: 245 for (i = 0; i < sc->mr_ndesc; i++) 246 if (sc->mr_desc[i].mr_base == desc->mr_base && 247 sc->mr_desc[i].mr_len == desc->mr_len) { 248 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i])); 249 return (0); 250 } 251 return (ENOENT); 252 default: 253 return (EOPNOTSUPP); 254 } 255 256 return (0); 257 } 258 259 /* 260 * Operations for changing memory attributes. 261 * 262 * This is basically just an ioctl shim for mem_range_attr_get 263 * and mem_range_attr_set. 264 */ 265 /* ARGSUSED */ 266 int 267 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 268 struct thread *td) 269 { 270 int nd, error = 0; 271 struct mem_range_op *mo = (struct mem_range_op *)data; 272 struct mem_range_desc *md; 273 274 /* is this for us? */ 275 if ((cmd != MEMRANGE_GET) && 276 (cmd != MEMRANGE_SET)) 277 return (ENOTTY); 278 279 /* any chance we can handle this? */ 280 if (mem_range_softc.mr_op == NULL) 281 return (EOPNOTSUPP); 282 283 /* do we have any descriptors? */ 284 if (mem_range_softc.mr_ndesc == 0) 285 return (ENXIO); 286 287 switch (cmd) { 288 case MEMRANGE_GET: 289 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 290 if (nd > 0) { 291 md = (struct mem_range_desc *) 292 malloc(nd * sizeof(struct mem_range_desc), 293 M_MEMDESC, M_WAITOK); 294 error = mem_range_attr_get(md, &nd); 295 if (!error) 296 error = copyout(md, mo->mo_desc, 297 nd * sizeof(struct mem_range_desc)); 298 free(md, M_MEMDESC); 299 } 300 else 301 nd = mem_range_softc.mr_ndesc; 302 mo->mo_arg[0] = nd; 303 break; 304 305 case MEMRANGE_SET: 306 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 307 M_MEMDESC, M_WAITOK); 308 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 309 /* clamp description string */ 310 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 311 if (error == 0) 312 error = mem_range_attr_set(md, &mo->mo_arg[0]); 313 free(md, M_MEMDESC); 314 break; 315 } 316 return (error); 317 } 318 319