Annotation of sys/arch/mvmeppc/dev/mem.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.8 2005/12/17 07:31:26 miod Exp $ */
! 2: /* $NetBSD: mem.c,v 1.1 1996/09/30 16:34:50 ws Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1988 University of Utah.
! 6: * Copyright (c) 1982, 1986, 1990, 1993
! 7: * The Regents of the University of California. All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * the Systems Programming Group of the University of Utah Computer
! 11: * Science Department.
! 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: * @(#)mem.c 8.3 (Berkeley) 1/12/94
! 38: */
! 39:
! 40: /*
! 41: * Memory special file
! 42: */
! 43:
! 44: #include <sys/param.h>
! 45: #include <sys/buf.h>
! 46: #include <sys/systm.h>
! 47: #include <sys/uio.h>
! 48: #include <sys/malloc.h>
! 49:
! 50: #include <machine/conf.h>
! 51:
! 52: #include <uvm/uvm_extern.h>
! 53:
! 54: /*ARGSUSED*/
! 55: int
! 56: mmopen(dev, flag, mode, p)
! 57: dev_t dev;
! 58: int flag, mode;
! 59: struct proc *p;
! 60: {
! 61:
! 62: switch (minor(dev)) {
! 63: case 0:
! 64: case 1:
! 65: case 2:
! 66: case 12:
! 67: return (0);
! 68: default:
! 69: return (ENXIO);
! 70: }
! 71: }
! 72:
! 73: /*ARGSUSED*/
! 74: int
! 75: mmclose(dev, flag, mode, p)
! 76: dev_t dev;
! 77: int flag, mode;
! 78: struct proc *p;
! 79: {
! 80:
! 81: return 0;
! 82: }
! 83:
! 84: /*ARGSUSED*/
! 85: int
! 86: mmrw(dev, uio, flags)
! 87: dev_t dev;
! 88: struct uio *uio;
! 89: int flags;
! 90: {
! 91: vaddr_t v;
! 92: u_int c;
! 93: struct iovec *iov;
! 94: int error = 0;
! 95: static caddr_t zeropage;
! 96:
! 97: while (uio->uio_resid > 0 && error == 0) {
! 98: iov = uio->uio_iov;
! 99: if (iov->iov_len == 0) {
! 100: uio->uio_iov++;
! 101: uio->uio_iovcnt--;
! 102: if (uio->uio_iovcnt < 0)
! 103: panic("mmrw");
! 104: continue;
! 105: }
! 106: switch (minor(dev)) {
! 107:
! 108: /* minor device 0 is physical memory */
! 109: case 0:
! 110: v = uio->uio_offset;
! 111: c = uio->uio_resid;
! 112: /* This doesn't allow device mapping! XXX */
! 113: pmap_real_memory(&v, (vsize_t *)&c);
! 114: error = uiomove((caddr_t)v, c, uio);
! 115: continue;
! 116:
! 117: /* minor device 1 is kernel memory */
! 118: case 1:
! 119: v = uio->uio_offset;
! 120: c = min(iov->iov_len, MAXPHYS);
! 121: error = uiomove((caddr_t)v, c, uio);
! 122: continue;
! 123:
! 124: /* minor device 2 is EOF/RATHOLE */
! 125: case 2:
! 126: if (uio->uio_rw == UIO_WRITE)
! 127: uio->uio_resid = 0;
! 128: return 0;
! 129:
! 130: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
! 131: case 12:
! 132: if (uio->uio_rw == UIO_WRITE) {
! 133: c = iov->iov_len;
! 134: break;
! 135: }
! 136: if (zeropage == NULL) {
! 137: zeropage = (caddr_t)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
! 138: bzero(zeropage, PAGE_SIZE);
! 139: }
! 140: c = min(iov->iov_len, PAGE_SIZE);
! 141: error = uiomove(zeropage, c, uio);
! 142: continue;
! 143:
! 144: default:
! 145: return ENXIO;
! 146: }
! 147: if (error)
! 148: break;
! 149: iov->iov_base += c;
! 150: iov->iov_len -= c;
! 151: uio->uio_offset += c;
! 152: uio->uio_resid -= c;
! 153: }
! 154: return error;
! 155: }
! 156:
! 157: paddr_t
! 158: mmmmap(dev, off, prot)
! 159: dev_t dev;
! 160: off_t off;
! 161: int prot;
! 162: {
! 163: return (-1);
! 164: }
! 165:
! 166: /*ARGSUSED*/
! 167: int
! 168: mmioctl(dev, cmd, data, flags, p)
! 169: dev_t dev;
! 170: u_long cmd;
! 171: caddr_t data;
! 172: int flags;
! 173: struct proc *p;
! 174: {
! 175: return (EOPNOTSUPP);
! 176: }
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