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; 101 102 cnt = 0; 103 error = 0; 104 105 while (uio->uio_resid > 0 && !error) { 106 iov = uio->uio_iov; 107 if (iov->iov_len == 0) { 108 uio->uio_iov++; 109 uio->uio_iovcnt--; 110 if (uio->uio_iovcnt < 0) 111 panic("memrw"); 112 continue; 113 } 114 if (dev2unit(dev) == CDEV_MINOR_MEM) { 115 kmem_direct_mapped: v = uio->uio_offset; 116 117 off = uio->uio_offset & PAGE_MASK; 118 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 119 PAGE_MASK); 120 cnt = min(cnt, PAGE_SIZE - off); 121 cnt = min(cnt, iov->iov_len); 122 123 if (mem_valid(v, cnt)) { 124 error = EFAULT; 125 break; 126 } 127 128 if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) { 129 error = uiomove((void *)PHYS_TO_DMAP(v), cnt, 130 uio); 131 } else { 132 m.phys_addr = trunc_page(v); 133 marr = &m; 134 error = uiomove_fromphys(&marr, off, cnt, uio); 135 } 136 } 137 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 138 va = uio->uio_offset; 139 140 if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end)) 141 goto kmem_direct_mapped; 142 143 va = trunc_page(uio->uio_offset); 144 eva = round_page(uio->uio_offset 145 + iov->iov_len); 146 147 /* 148 * Make sure that all the pages are currently resident 149 * so that we don't create any zero-fill pages. 150 */ 151 152 for (; va < eva; va += PAGE_SIZE) 153 if (pmap_extract(kernel_pmap, va) == 0) 154 return (EFAULT); 155 156 prot = (uio->uio_rw == UIO_READ) 157 ? VM_PROT_READ : VM_PROT_WRITE; 158 159 va = uio->uio_offset; 160 if (kernacc((void *) va, iov->iov_len, prot) 161 == FALSE) 162 return (EFAULT); 163 164 error = uiomove((void *)va, iov->iov_len, uio); 165 166 continue; 167 } 168 } 169 170 return (error); 171 } 172 173 /* 174 * allow user processes to MMAP some memory sections 175 * instead of going through read/write 176 */ 177 int 178 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 179 int prot, vm_memattr_t *memattr) 180 { 181 int i; 182 183 if (dev2unit(dev) == CDEV_MINOR_MEM) 184 *paddr = offset; 185 else 186 return (EFAULT); 187 188 for (i = 0; i < mem_range_softc.mr_ndesc; i++) { 189 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE)) 190 continue; 191 192 if (offset >= mem_range_softc.mr_desc[i].mr_base && 193 offset < mem_range_softc.mr_desc[i].mr_base + 194 mem_range_softc.mr_desc[i].mr_len) { 195 switch (mem_range_softc.mr_desc[i].mr_flags & 196 MDF_ATTRMASK) { 197 case MDF_WRITEBACK: 198 *memattr = VM_MEMATTR_WRITE_BACK; 199 break; 200 case MDF_WRITECOMBINE: 201 *memattr = VM_MEMATTR_WRITE_COMBINING; 202 break; 203 case MDF_UNCACHEABLE: 204 *memattr = VM_MEMATTR_UNCACHEABLE; 205 break; 206 case MDF_WRITETHROUGH: 207 *memattr = VM_MEMATTR_WRITE_THROUGH; 208 break; 209 } 210 211 break; 212 } 213 } 214 215 return (0); 216 } 217 218 static void 219 ppc_mrinit(struct mem_range_softc *sc) 220 { 221 sc->mr_cap = 0; 222 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */ 223 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), 224 M_MEMDESC, M_WAITOK | M_ZERO); 225 } 226 227 static int 228 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) 229 { 230 int i; 231 232 switch(*arg) { 233 case MEMRANGE_SET_UPDATE: 234 for (i = 0; i < sc->mr_ndesc; i++) { 235 if (!sc->mr_desc[i].mr_len) { 236 sc->mr_desc[i] = *desc; 237 sc->mr_desc[i].mr_flags |= MDF_ACTIVE; 238 return (0); 239 } 240 if (sc->mr_desc[i].mr_base == desc->mr_base && 241 sc->mr_desc[i].mr_len == desc->mr_len) 242 return (EEXIST); 243 } 244 return (ENOSPC); 245 case MEMRANGE_SET_REMOVE: 246 for (i = 0; i < sc->mr_ndesc; i++) 247 if (sc->mr_desc[i].mr_base == desc->mr_base && 248 sc->mr_desc[i].mr_len == desc->mr_len) { 249 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i])); 250 return (0); 251 } 252 return (ENOENT); 253 default: 254 return (EOPNOTSUPP); 255 } 256 257 return (0); 258 } 259 260 /* 261 * Operations for changing memory attributes. 262 * 263 * This is basically just an ioctl shim for mem_range_attr_get 264 * and mem_range_attr_set. 265 */ 266 /* ARGSUSED */ 267 int 268 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 269 struct thread *td) 270 { 271 int nd, error = 0; 272 struct mem_range_op *mo = (struct mem_range_op *)data; 273 struct mem_range_desc *md; 274 275 /* is this for us? */ 276 if ((cmd != MEMRANGE_GET) && 277 (cmd != MEMRANGE_SET)) 278 return (ENOTTY); 279 280 /* any chance we can handle this? */ 281 if (mem_range_softc.mr_op == NULL) 282 return (EOPNOTSUPP); 283 284 /* do we have any descriptors? */ 285 if (mem_range_softc.mr_ndesc == 0) 286 return (ENXIO); 287 288 switch (cmd) { 289 case MEMRANGE_GET: 290 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 291 if (nd > 0) { 292 md = (struct mem_range_desc *) 293 malloc(nd * sizeof(struct mem_range_desc), 294 M_MEMDESC, M_WAITOK); 295 error = mem_range_attr_get(md, &nd); 296 if (!error) 297 error = copyout(md, mo->mo_desc, 298 nd * sizeof(struct mem_range_desc)); 299 free(md, M_MEMDESC); 300 } 301 else 302 nd = mem_range_softc.mr_ndesc; 303 mo->mo_arg[0] = nd; 304 break; 305 306 case MEMRANGE_SET: 307 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 308 M_MEMDESC, M_WAITOK); 309 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 310 /* clamp description string */ 311 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 312 if (error == 0) 313 error = mem_range_attr_set(md, &mo->mo_arg[0]); 314 free(md, M_MEMDESC); 315 break; 316 } 317 return (error); 318 } 319 320