1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department, and code derived from software contributed to 11 * Berkeley by William Jolitz. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 38 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 /* 45 * Memory special file 46 */ 47 48 #include <sys/param.h> 49 #include <sys/conf.h> 50 #include <sys/fcntl.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/ioccom.h> 54 #include <sys/malloc.h> 55 #include <sys/memrange.h> 56 #include <sys/module.h> 57 #include <sys/mutex.h> 58 #include <sys/proc.h> 59 #include <sys/msgbuf.h> 60 #include <sys/systm.h> 61 #include <sys/signalvar.h> 62 #include <sys/uio.h> 63 64 #include <machine/md_var.h> 65 #include <machine/vmparam.h> 66 67 #include <vm/vm.h> 68 #include <vm/pmap.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_page.h> 71 72 #include <machine/memdev.h> 73 74 static void ppc_mrinit(struct mem_range_softc *); 75 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *); 76 77 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 78 79 static struct mem_range_ops ppc_mem_range_ops = { 80 ppc_mrinit, 81 ppc_mrset, 82 NULL, 83 NULL 84 }; 85 struct mem_range_softc mem_range_softc = { 86 &ppc_mem_range_ops, 87 0, 0, NULL 88 }; 89 90 /* ARGSUSED */ 91 int 92 memrw(struct cdev *dev, struct uio *uio, int flags) 93 { 94 struct iovec *iov; 95 int error = 0; 96 vm_offset_t va, eva, off, v; 97 vm_prot_t prot; 98 struct vm_page m; 99 vm_page_t marr; 100 vm_size_t cnt; 101 ssize_t orig_resid; 102 103 cnt = 0; 104 error = 0; 105 orig_resid = uio->uio_resid; 106 107 while (uio->uio_resid > 0 && !error) { 108 iov = uio->uio_iov; 109 if (iov->iov_len == 0) { 110 uio->uio_iov++; 111 uio->uio_iovcnt--; 112 if (uio->uio_iovcnt < 0) 113 panic("memrw"); 114 continue; 115 } 116 if (dev2unit(dev) == CDEV_MINOR_MEM) { 117 v = uio->uio_offset; 118 119 kmem_direct_mapped: off = v & PAGE_MASK; 120 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 121 PAGE_MASK); 122 cnt = min(cnt, PAGE_SIZE - off); 123 cnt = min(cnt, iov->iov_len); 124 125 if (mem_valid(v, cnt)) { 126 error = EFAULT; 127 break; 128 } 129 130 if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) { 131 error = uiomove((void *)PHYS_TO_DMAP(v), cnt, 132 uio); 133 } else { 134 m.phys_addr = trunc_page(v); 135 marr = &m; 136 error = uiomove_fromphys(&marr, off, cnt, uio); 137 } 138 } 139 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 140 va = uio->uio_offset; 141 142 if (hw_direct_map && 143 ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))) { 144 v = DMAP_TO_PHYS(va); 145 goto kmem_direct_mapped; 146 } 147 148 va = trunc_page(uio->uio_offset); 149 eva = round_page(uio->uio_offset 150 + iov->iov_len); 151 152 /* 153 * Make sure that all the pages are currently resident 154 * so that we don't create any zero-fill pages. 155 */ 156 157 for (; va < eva; va += PAGE_SIZE) { 158 if (pmap_extract(kernel_pmap, va) == 0) { 159 error = EFAULT; 160 break; 161 } 162 } 163 if (error != 0) 164 break; 165 166 prot = (uio->uio_rw == UIO_READ) 167 ? VM_PROT_READ : VM_PROT_WRITE; 168 169 va = uio->uio_offset; 170 if (((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) && 171 !kernacc((void *) va, iov->iov_len, prot)) { 172 error = EFAULT; 173 break; 174 } 175 176 error = uiomove((void *)va, iov->iov_len, uio); 177 } 178 } 179 /* 180 * Don't return error if any byte was written. Read and write 181 * can return error only if no i/o was performed. 182 */ 183 if (uio->uio_resid != orig_resid) 184 error = 0; 185 return (error); 186 } 187 188 /* 189 * allow user processes to MMAP some memory sections 190 * instead of going through read/write 191 */ 192 int 193 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 194 int prot, vm_memattr_t *memattr) 195 { 196 int i; 197 198 if (dev2unit(dev) == CDEV_MINOR_MEM) 199 *paddr = offset; 200 else 201 return (EFAULT); 202 203 for (i = 0; i < mem_range_softc.mr_ndesc; i++) { 204 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE)) 205 continue; 206 207 if (offset >= mem_range_softc.mr_desc[i].mr_base && 208 offset < mem_range_softc.mr_desc[i].mr_base + 209 mem_range_softc.mr_desc[i].mr_len) { 210 switch (mem_range_softc.mr_desc[i].mr_flags & 211 MDF_ATTRMASK) { 212 case MDF_WRITEBACK: 213 *memattr = VM_MEMATTR_WRITE_BACK; 214 break; 215 case MDF_WRITECOMBINE: 216 *memattr = VM_MEMATTR_WRITE_COMBINING; 217 break; 218 case MDF_UNCACHEABLE: 219 *memattr = VM_MEMATTR_UNCACHEABLE; 220 break; 221 case MDF_WRITETHROUGH: 222 *memattr = VM_MEMATTR_WRITE_THROUGH; 223 break; 224 } 225 226 break; 227 } 228 } 229 230 return (0); 231 } 232 233 static void 234 ppc_mrinit(struct mem_range_softc *sc) 235 { 236 sc->mr_cap = 0; 237 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */ 238 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), 239 M_MEMDESC, M_WAITOK | M_ZERO); 240 } 241 242 static int 243 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) 244 { 245 int i; 246 247 switch(*arg) { 248 case MEMRANGE_SET_UPDATE: 249 for (i = 0; i < sc->mr_ndesc; i++) { 250 if (!sc->mr_desc[i].mr_len) { 251 sc->mr_desc[i] = *desc; 252 sc->mr_desc[i].mr_flags |= MDF_ACTIVE; 253 return (0); 254 } 255 if (sc->mr_desc[i].mr_base == desc->mr_base && 256 sc->mr_desc[i].mr_len == desc->mr_len) 257 return (EEXIST); 258 } 259 return (ENOSPC); 260 case MEMRANGE_SET_REMOVE: 261 for (i = 0; i < sc->mr_ndesc; i++) 262 if (sc->mr_desc[i].mr_base == desc->mr_base && 263 sc->mr_desc[i].mr_len == desc->mr_len) { 264 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i])); 265 return (0); 266 } 267 return (ENOENT); 268 default: 269 return (EOPNOTSUPP); 270 } 271 272 return (0); 273 } 274 275 /* 276 * Operations for changing memory attributes. 277 * 278 * This is basically just an ioctl shim for mem_range_attr_get 279 * and mem_range_attr_set. 280 */ 281 /* ARGSUSED */ 282 int 283 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 284 struct thread *td) 285 { 286 int nd, error = 0; 287 struct mem_range_op *mo = (struct mem_range_op *)data; 288 struct mem_range_desc *md; 289 290 /* is this for us? */ 291 if ((cmd != MEMRANGE_GET) && 292 (cmd != MEMRANGE_SET)) 293 return (ENOTTY); 294 295 /* any chance we can handle this? */ 296 if (mem_range_softc.mr_op == NULL) 297 return (EOPNOTSUPP); 298 299 /* do we have any descriptors? */ 300 if (mem_range_softc.mr_ndesc == 0) 301 return (ENXIO); 302 303 switch (cmd) { 304 case MEMRANGE_GET: 305 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 306 if (nd > 0) { 307 md = (struct mem_range_desc *) 308 malloc(nd * sizeof(struct mem_range_desc), 309 M_MEMDESC, M_WAITOK); 310 error = mem_range_attr_get(md, &nd); 311 if (!error) 312 error = copyout(md, mo->mo_desc, 313 nd * sizeof(struct mem_range_desc)); 314 free(md, M_MEMDESC); 315 } 316 else 317 nd = mem_range_softc.mr_ndesc; 318 mo->mo_arg[0] = nd; 319 break; 320 321 case MEMRANGE_SET: 322 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 323 M_MEMDESC, M_WAITOK); 324 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 325 /* clamp description string */ 326 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 327 if (error == 0) 328 error = mem_range_attr_set(md, &mo->mo_arg[0]); 329 free(md, M_MEMDESC); 330 break; 331 } 332 return (error); 333 } 334 335