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 */ 39 40 #include <sys/cdefs.h> 41 /* 42 * Memory special file 43 */ 44 45 #include <sys/param.h> 46 #include <sys/conf.h> 47 #include <sys/fcntl.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/ioccom.h> 51 #include <sys/malloc.h> 52 #include <sys/memrange.h> 53 #include <sys/module.h> 54 #include <sys/mutex.h> 55 #include <sys/proc.h> 56 #include <sys/msgbuf.h> 57 #include <sys/systm.h> 58 #include <sys/signalvar.h> 59 #include <sys/uio.h> 60 61 #include <machine/md_var.h> 62 #include <machine/vmparam.h> 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_page.h> 68 69 #include <machine/memdev.h> 70 71 static void ppc_mrinit(struct mem_range_softc *); 72 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *); 73 74 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 75 76 static struct mem_range_ops ppc_mem_range_ops = { 77 ppc_mrinit, 78 ppc_mrset, 79 NULL, 80 NULL 81 }; 82 struct mem_range_softc mem_range_softc = { 83 &ppc_mem_range_ops, 84 0, 0, NULL 85 }; 86 87 /* ARGSUSED */ 88 int 89 memrw(struct cdev *dev, struct uio *uio, int flags) 90 { 91 struct iovec *iov; 92 int error = 0; 93 vm_offset_t va, eva, off, v; 94 vm_prot_t prot; 95 struct vm_page m; 96 vm_page_t marr; 97 vm_size_t cnt; 98 ssize_t orig_resid; 99 100 cnt = 0; 101 error = 0; 102 orig_resid = uio->uio_resid; 103 104 while (uio->uio_resid > 0 && !error) { 105 iov = uio->uio_iov; 106 if (iov->iov_len == 0) { 107 uio->uio_iov++; 108 uio->uio_iovcnt--; 109 if (uio->uio_iovcnt < 0) 110 panic("memrw"); 111 continue; 112 } 113 if (dev2unit(dev) == CDEV_MINOR_MEM) { 114 v = uio->uio_offset; 115 116 kmem_direct_mapped: off = v & PAGE_MASK; 117 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 118 PAGE_MASK); 119 cnt = min(cnt, PAGE_SIZE - off); 120 cnt = min(cnt, iov->iov_len); 121 122 if (mem_valid(v, cnt)) { 123 error = EFAULT; 124 break; 125 } 126 127 if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) { 128 error = uiomove((void *)PHYS_TO_DMAP(v), cnt, 129 uio); 130 } else { 131 m.phys_addr = trunc_page(v); 132 marr = &m; 133 error = uiomove_fromphys(&marr, off, cnt, uio); 134 } 135 } 136 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 137 va = uio->uio_offset; 138 139 if (hw_direct_map && 140 ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))) { 141 v = DMAP_TO_PHYS(va); 142 goto kmem_direct_mapped; 143 } 144 145 va = trunc_page(uio->uio_offset); 146 eva = round_page(uio->uio_offset 147 + iov->iov_len); 148 149 /* 150 * Make sure that all the pages are currently resident 151 * so that we don't create any zero-fill pages. 152 */ 153 154 for (; va < eva; va += PAGE_SIZE) { 155 if (pmap_extract(kernel_pmap, va) == 0) { 156 error = EFAULT; 157 break; 158 } 159 } 160 if (error != 0) 161 break; 162 163 prot = (uio->uio_rw == UIO_READ) 164 ? VM_PROT_READ : VM_PROT_WRITE; 165 166 va = uio->uio_offset; 167 if (((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) && 168 !kernacc((void *) va, iov->iov_len, prot)) { 169 error = EFAULT; 170 break; 171 } 172 173 error = uiomove((void *)va, iov->iov_len, uio); 174 } 175 } 176 /* 177 * Don't return error if any byte was written. Read and write 178 * can return error only if no i/o was performed. 179 */ 180 if (uio->uio_resid != orig_resid) 181 error = 0; 182 return (error); 183 } 184 185 /* 186 * allow user processes to MMAP some memory sections 187 * instead of going through read/write 188 */ 189 int 190 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 191 int prot, vm_memattr_t *memattr) 192 { 193 int i; 194 195 if (dev2unit(dev) == CDEV_MINOR_MEM) 196 *paddr = offset; 197 else 198 return (EFAULT); 199 200 for (i = 0; i < mem_range_softc.mr_ndesc; i++) { 201 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE)) 202 continue; 203 204 if (offset >= mem_range_softc.mr_desc[i].mr_base && 205 offset < mem_range_softc.mr_desc[i].mr_base + 206 mem_range_softc.mr_desc[i].mr_len) { 207 switch (mem_range_softc.mr_desc[i].mr_flags & 208 MDF_ATTRMASK) { 209 case MDF_WRITEBACK: 210 *memattr = VM_MEMATTR_WRITE_BACK; 211 break; 212 case MDF_WRITECOMBINE: 213 *memattr = VM_MEMATTR_WRITE_COMBINING; 214 break; 215 case MDF_UNCACHEABLE: 216 *memattr = VM_MEMATTR_UNCACHEABLE; 217 break; 218 case MDF_WRITETHROUGH: 219 *memattr = VM_MEMATTR_WRITE_THROUGH; 220 break; 221 } 222 223 break; 224 } 225 } 226 227 return (0); 228 } 229 230 static void 231 ppc_mrinit(struct mem_range_softc *sc) 232 { 233 sc->mr_cap = 0; 234 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */ 235 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), 236 M_MEMDESC, M_WAITOK | M_ZERO); 237 } 238 239 static int 240 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) 241 { 242 int i; 243 244 switch(*arg) { 245 case MEMRANGE_SET_UPDATE: 246 for (i = 0; i < sc->mr_ndesc; i++) { 247 if (!sc->mr_desc[i].mr_len) { 248 sc->mr_desc[i] = *desc; 249 sc->mr_desc[i].mr_flags |= MDF_ACTIVE; 250 return (0); 251 } 252 if (sc->mr_desc[i].mr_base == desc->mr_base && 253 sc->mr_desc[i].mr_len == desc->mr_len) 254 return (EEXIST); 255 } 256 return (ENOSPC); 257 case MEMRANGE_SET_REMOVE: 258 for (i = 0; i < sc->mr_ndesc; i++) 259 if (sc->mr_desc[i].mr_base == desc->mr_base && 260 sc->mr_desc[i].mr_len == desc->mr_len) { 261 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i])); 262 return (0); 263 } 264 return (ENOENT); 265 default: 266 return (EOPNOTSUPP); 267 } 268 269 return (0); 270 } 271 272 /* 273 * Operations for changing memory attributes. 274 * 275 * This is basically just an ioctl shim for mem_range_attr_get 276 * and mem_range_attr_set. 277 */ 278 int 279 memioctl_md(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 280 struct thread *td) 281 { 282 int nd, error = 0; 283 struct mem_range_op *mo = (struct mem_range_op *)data; 284 struct mem_range_desc *md; 285 286 /* is this for us? */ 287 if ((cmd != MEMRANGE_GET) && 288 (cmd != MEMRANGE_SET)) 289 return (ENOTTY); 290 291 /* any chance we can handle this? */ 292 if (mem_range_softc.mr_op == NULL) 293 return (EOPNOTSUPP); 294 295 /* do we have any descriptors? */ 296 if (mem_range_softc.mr_ndesc == 0) 297 return (ENXIO); 298 299 switch (cmd) { 300 case MEMRANGE_GET: 301 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 302 if (nd > 0) { 303 md = (struct mem_range_desc *) 304 malloc(nd * sizeof(struct mem_range_desc), 305 M_MEMDESC, M_WAITOK); 306 error = mem_range_attr_get(md, &nd); 307 if (!error) 308 error = copyout(md, mo->mo_desc, 309 nd * sizeof(struct mem_range_desc)); 310 free(md, M_MEMDESC); 311 } 312 else 313 nd = mem_range_softc.mr_ndesc; 314 mo->mo_arg[0] = nd; 315 break; 316 317 case MEMRANGE_SET: 318 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 319 M_MEMDESC, M_WAITOK); 320 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 321 /* clamp description string */ 322 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 323 if (error == 0) 324 error = mem_range_attr_set(md, &mo->mo_arg[0]); 325 free(md, M_MEMDESC); 326 break; 327 } 328 return (error); 329 } 330