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1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.1.1.1 2006/04/18 12:42:03 miod Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1988 University of Utah.
! 5: * Copyright (c) 1982, 1986, 1990, 1993
! 6: * The Regents of the University of California. 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.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: *
! 36: * @(#)mem.c 8.3 (Berkeley) 1/12/94
! 37: */
! 38:
! 39: /*
! 40: * Memory special file
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/buf.h>
! 45: #include <sys/systm.h>
! 46: #include <sys/uio.h>
! 47: #include <sys/malloc.h>
! 48:
! 49: #include <machine/conf.h>
! 50:
! 51: #include <uvm/uvm_extern.h>
! 52:
! 53: caddr_t zeropage;
! 54: extern vaddr_t last_addr;
! 55:
! 56: /*ARGSUSED*/
! 57: int
! 58: mmopen(dev, flag, mode, p)
! 59: dev_t dev;
! 60: int flag, mode;
! 61: struct proc *p;
! 62: {
! 63:
! 64: switch (minor(dev)) {
! 65: case 0:
! 66: case 1:
! 67: case 2:
! 68: case 12:
! 69: return (0);
! 70: default:
! 71: return (ENXIO);
! 72: }
! 73: }
! 74:
! 75: /*ARGSUSED*/
! 76: int
! 77: mmclose(dev, flag, mode, p)
! 78: dev_t dev;
! 79: int flag, mode;
! 80: struct proc *p;
! 81: {
! 82:
! 83: return (0);
! 84: }
! 85:
! 86: /*ARGSUSED*/
! 87: int
! 88: mmrw(dev, uio, flags)
! 89: dev_t dev;
! 90: struct uio *uio;
! 91: int flags;
! 92: {
! 93: vaddr_t o, v;
! 94: int c;
! 95: struct iovec *iov;
! 96: int error = 0;
! 97: static int physlock = 0;
! 98: extern caddr_t vmmap;
! 99:
! 100: if (minor(dev) == 0) {
! 101: /* lock against other uses of shared vmmap */
! 102: while (physlock > 0) {
! 103: physlock++;
! 104: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
! 105: "mmrw", 0);
! 106: if (error)
! 107: return (error);
! 108: }
! 109: physlock = 1;
! 110: }
! 111: while (uio->uio_resid > 0 && error == 0) {
! 112: iov = uio->uio_iov;
! 113: if (iov->iov_len == 0) {
! 114: uio->uio_iov++;
! 115: uio->uio_iovcnt--;
! 116: if (uio->uio_iovcnt < 0)
! 117: panic("mmrw");
! 118: continue;
! 119: }
! 120: switch (minor(dev)) {
! 121:
! 122: /* minor device 0 is physical memory */
! 123: case 0:
! 124: /* move one page at a time */
! 125: v = uio->uio_offset;
! 126: if (v > last_addr) {
! 127: error = EFAULT;
! 128: goto unlock;
! 129: }
! 130: pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
! 131: trunc_page(v),
! 132: uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
! 133: (uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE) | PMAP_WIRED);
! 134: pmap_update(pmap_kernel());
! 135: o = uio->uio_offset & PGOFSET;
! 136: c = min(uio->uio_resid, (int)(NBPG - o));
! 137: error = uiomove((caddr_t)vmmap + o, c, uio);
! 138: pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
! 139: (vaddr_t)vmmap + NBPG);
! 140: pmap_update(pmap_kernel());
! 141: continue;
! 142:
! 143: /* minor device 1 is kernel memory */
! 144: case 1:
! 145: v = uio->uio_offset;
! 146: c = min(iov->iov_len, MAXPHYS);
! 147: if (!uvm_kernacc((caddr_t)v, c,
! 148: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
! 149: return (EFAULT);
! 150: if (v < NBPG) {
! 151: #ifdef DEBUG
! 152: /*
! 153: * For now, return zeros on read of page 0
! 154: * and EFAULT for writes.
! 155: */
! 156: if (uio->uio_rw == UIO_READ) {
! 157: if (zeropage == NULL) {
! 158: zeropage = (caddr_t)
! 159: malloc(PAGE_SIZE, M_TEMP,
! 160: M_WAITOK);
! 161: bzero(zeropage, PAGE_SIZE);
! 162: }
! 163: c = min(c, NBPG - (int)v);
! 164: v = (vaddr_t)zeropage;
! 165: } else
! 166: #endif
! 167: return (EFAULT);
! 168: }
! 169: error = uiomove((caddr_t)v, c, uio);
! 170: continue;
! 171:
! 172: /* minor device 2 is EOF/RATHOLE */
! 173: case 2:
! 174: if (uio->uio_rw == UIO_WRITE)
! 175: uio->uio_resid = 0;
! 176: return (0);
! 177:
! 178: /* should add vme bus so that we can do user level probes */
! 179:
! 180: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
! 181: case 12:
! 182: if (uio->uio_rw == UIO_WRITE) {
! 183: c = iov->iov_len;
! 184: break;
! 185: }
! 186: if (zeropage == NULL) {
! 187: zeropage = (caddr_t)
! 188: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
! 189: bzero(zeropage, PAGE_SIZE);
! 190: }
! 191: c = min(iov->iov_len, PAGE_SIZE);
! 192: error = uiomove(zeropage, c, uio);
! 193: continue;
! 194:
! 195: default:
! 196: return (ENXIO);
! 197: }
! 198: if (error)
! 199: break;
! 200: iov->iov_base += c;
! 201: iov->iov_len -= c;
! 202: uio->uio_offset += c;
! 203: uio->uio_resid -= c;
! 204: }
! 205: if (minor(dev) == 0) {
! 206: unlock:
! 207: if (physlock > 1)
! 208: wakeup((caddr_t)&physlock);
! 209: physlock = 0;
! 210: }
! 211: return (error);
! 212: }
! 213:
! 214: paddr_t
! 215: mmmmap(dev, off, prot)
! 216: dev_t dev;
! 217: off_t off;
! 218: int prot;
! 219: {
! 220: return (-1);
! 221: }
! 222:
! 223: /*ARGSUSED*/
! 224: int
! 225: mmioctl(dev, cmd, data, flags, p)
! 226: dev_t dev;
! 227: u_long cmd;
! 228: caddr_t data;
! 229: int flags;
! 230: struct proc *p;
! 231: {
! 232: return (EOPNOTSUPP);
! 233: }