Annotation of sys/arch/mvme68k/mvme68k/mem.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.24 2006/05/19 22:51:09 miod Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1995 Theo de Raadt
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: *
! 15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
! 16: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
! 17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
! 19: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 25: * SUCH DAMAGE.
! 26: *
! 27: * Copyright (c) 1988 University of Utah.
! 28: * Copyright (c) 1982, 1986, 1990, 1993
! 29: * The Regents of the University of California. All rights reserved.
! 30: *
! 31: * This code is derived from software contributed to Berkeley by
! 32: * the Systems Programming Group of the University of Utah Computer
! 33: * Science Department.
! 34: *
! 35: * Redistribution and use in source and binary forms, with or without
! 36: * modification, are permitted provided that the following conditions
! 37: * are met:
! 38: * 1. Redistributions of source code must retain the above copyright
! 39: * notice, this list of conditions and the following disclaimer.
! 40: * 2. Redistributions in binary form must reproduce the above copyright
! 41: * notice, this list of conditions and the following disclaimer in the
! 42: * documentation and/or other materials provided with the distribution.
! 43: * 3. Neither the name of the University nor the names of its contributors
! 44: * may be used to endorse or promote products derived from this software
! 45: * without specific prior written permission.
! 46: *
! 47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 57: * SUCH DAMAGE.
! 58: *
! 59: * @(#)mem.c 8.3 (Berkeley) 1/12/94
! 60: */
! 61:
! 62: /*
! 63: * Memory special file
! 64: */
! 65:
! 66: #include <sys/param.h>
! 67: #include <sys/buf.h>
! 68: #include <sys/systm.h>
! 69: #include <sys/uio.h>
! 70: #include <sys/malloc.h>
! 71:
! 72: #include <machine/cpu.h>
! 73: #include <machine/conf.h>
! 74:
! 75: #include <uvm/uvm_extern.h>
! 76:
! 77: static caddr_t devzeropage;
! 78:
! 79: /*ARGSUSED*/
! 80: int
! 81: mmopen(dev, flag, mode, p)
! 82: dev_t dev;
! 83: int flag, mode;
! 84: struct proc *p;
! 85: {
! 86:
! 87: switch (minor(dev)) {
! 88: case 0:
! 89: case 1:
! 90: case 2:
! 91: case 12:
! 92: return (0);
! 93: default:
! 94: return (ENXIO);
! 95: }
! 96: }
! 97:
! 98: /*ARGSUSED*/
! 99: int
! 100: mmclose(dev, flag, mode, p)
! 101: dev_t dev;
! 102: int flag, mode;
! 103: struct proc *p;
! 104: {
! 105:
! 106: return (0);
! 107: }
! 108:
! 109: /*ARGSUSED*/
! 110: int
! 111: mmrw(dev, uio, flags)
! 112: dev_t dev;
! 113: struct uio *uio;
! 114: int flags;
! 115: {
! 116: vaddr_t o, v;
! 117: int c;
! 118: struct iovec *iov;
! 119: int error = 0;
! 120: static int physlock;
! 121:
! 122: if (minor(dev) == 0) {
! 123: /* lock against other uses of shared vmmap */
! 124: while (physlock > 0) {
! 125: physlock++;
! 126: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
! 127: "mmrw", 0);
! 128: if (error)
! 129: return (error);
! 130: }
! 131: physlock = 1;
! 132: }
! 133: while (uio->uio_resid > 0 && error == 0) {
! 134: iov = uio->uio_iov;
! 135: if (iov->iov_len == 0) {
! 136: uio->uio_iov++;
! 137: uio->uio_iovcnt--;
! 138: if (uio->uio_iovcnt < 0)
! 139: panic("mmrw");
! 140: continue;
! 141: }
! 142: switch (minor(dev)) {
! 143:
! 144: /* minor device 0 is physical memory */
! 145: case 0:
! 146: v = uio->uio_offset;
! 147: #ifndef DEBUG
! 148: /* allow reads only in RAM (except for DEBUG) */
! 149: if (v >= 0xFFFFFFFC || v < NBPG) {
! 150: error = EFAULT;
! 151: goto unlock;
! 152: }
! 153: #endif
! 154:
! 155: pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
! 156: trunc_page(v),
! 157: uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
! 158: (uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE) | PMAP_WIRED);
! 159: pmap_update(pmap_kernel());
! 160: o = uio->uio_offset & PGOFSET;
! 161: c = min(uio->uio_resid, (int)(NBPG - o));
! 162: error = uiomove((caddr_t)vmmap + o, c, uio);
! 163: pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
! 164: (vaddr_t)vmmap + NBPG);
! 165: pmap_update(pmap_kernel());
! 166: continue;
! 167:
! 168: /* minor device 1 is kernel memory */
! 169: case 1:
! 170: v = uio->uio_offset;
! 171: c = min(iov->iov_len, MAXPHYS);
! 172: if (!uvm_kernacc((caddr_t)v, c,
! 173: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
! 174: return (EFAULT);
! 175: if (v < NBPG)
! 176: return (EFAULT);
! 177: error = uiomove((caddr_t)v, c, uio);
! 178: continue;
! 179:
! 180: /* minor device 2 is EOF/RATHOLE */
! 181: case 2:
! 182: if (uio->uio_rw == UIO_WRITE)
! 183: uio->uio_resid = 0;
! 184: return (0);
! 185:
! 186: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
! 187: case 12:
! 188: if (uio->uio_rw == UIO_WRITE) {
! 189: c = iov->iov_len;
! 190: break;
! 191: }
! 192: /*
! 193: * On the first call, allocate and zero a page
! 194: * of memory for use with /dev/zero.
! 195: *
! 196: * XXX on the mvme68k we already know where there
! 197: * is a global zeroed page, the null segment table.
! 198: */
! 199: if (devzeropage == NULL) {
! 200: extern caddr_t Segtabzero;
! 201: devzeropage = Segtabzero;
! 202: }
! 203: c = min(iov->iov_len, PAGE_SIZE);
! 204: error = uiomove(devzeropage, c, uio);
! 205: continue;
! 206:
! 207: default:
! 208: return (ENXIO);
! 209: }
! 210: if (error)
! 211: break;
! 212: iov->iov_base += c;
! 213: iov->iov_len -= c;
! 214: uio->uio_offset += c;
! 215: uio->uio_resid -= c;
! 216: }
! 217: if (minor(dev) == 0) {
! 218: unlock:
! 219: if (physlock > 1)
! 220: wakeup((caddr_t)&physlock);
! 221: physlock = 0;
! 222: }
! 223: return (error);
! 224: }
! 225:
! 226: paddr_t
! 227: mmmmap(dev, off, prot)
! 228: dev_t dev;
! 229: off_t off;
! 230: int prot;
! 231: {
! 232: /*
! 233: * /dev/mem is the only one that makes sense through this
! 234: * interface. For /dev/kmem any physaddr we return here
! 235: * could be transient and hence incorrect or invalid at
! 236: * a later time. /dev/null just doesn't make any sense
! 237: * and /dev/zero is a hack that is handled via the default
! 238: * pager in mmap().
! 239: */
! 240: if (minor(dev) != 0)
! 241: return (-1);
! 242: /*
! 243: * Allow access only in RAM.
! 244: *
! 245: * XXX could be extended to allow access to IO space but must
! 246: * be very careful.
! 247: */
! 248: if ((unsigned)off >= 0xFFFFFFFC || (unsigned)off < NBPG)
! 249: return (-1);
! 250: return (atop(off));
! 251: }
! 252:
! 253: /*ARGSUSED*/
! 254: int
! 255: mmioctl(dev, cmd, data, flags, p)
! 256: dev_t dev;
! 257: u_long cmd;
! 258: caddr_t data;
! 259: int flags;
! 260: struct proc *p;
! 261: {
! 262: return (EOPNOTSUPP);
! 263: }
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