Annotation of sys/arch/macppc/macppc/mem.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.13 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/ioccom.h>
! 48: #include <sys/uio.h>
! 49: #include <sys/malloc.h>
! 50: #include <sys/types.h>
! 51:
! 52: #include <machine/cpu.h>
! 53:
! 54: #include <uvm/uvm_extern.h>
! 55:
! 56: #include <machine/conf.h>
! 57:
! 58: /* open counter for aperture */
! 59: #ifdef APERTURE
! 60: static int ap_open_count = 0;
! 61: extern int allowaperture;
! 62: #endif
! 63:
! 64: /*ARGSUSED*/
! 65: int
! 66: mmopen(dev_t dev, int flag, int mode, struct proc *p)
! 67: {
! 68:
! 69: switch (minor(dev)) {
! 70: case 0:
! 71: case 1:
! 72: case 2:
! 73: case 12:
! 74: break;
! 75: #ifdef APERTURE
! 76: case 4:
! 77: if (suser(p, 0) != 0 || !allowaperture)
! 78: return (EPERM);
! 79:
! 80: /* authorize only one simultaneous open() */
! 81: if (ap_open_count > 0)
! 82: return(EPERM);
! 83: ap_open_count++;
! 84: break;
! 85: #endif
! 86: default:
! 87: return (ENXIO);
! 88: }
! 89: return (0);
! 90: }
! 91:
! 92: /*ARGSUSED*/
! 93: int
! 94: mmclose(dev_t dev, int flag, int mode, struct proc *p)
! 95: {
! 96: #ifdef APERTURE
! 97: if (minor(dev) == 4)
! 98: ap_open_count--;
! 99: #endif
! 100: return 0;
! 101: }
! 102:
! 103: /*ARGSUSED*/
! 104: int
! 105: mmrw(dev_t dev, struct uio *uio, int flags)
! 106: {
! 107: vaddr_t v;
! 108: vsize_t c;
! 109: struct iovec *iov;
! 110: int error = 0;
! 111: static caddr_t zeropage;
! 112:
! 113: while (uio->uio_resid > 0 && error == 0) {
! 114: iov = uio->uio_iov;
! 115: if (iov->iov_len == 0) {
! 116: uio->uio_iov++;
! 117: uio->uio_iovcnt--;
! 118: if (uio->uio_iovcnt < 0)
! 119: panic("mmrw");
! 120: continue;
! 121: }
! 122: switch (minor(dev)) {
! 123:
! 124: /* minor device 0 is physical memory */
! 125: case 0:
! 126: v = uio->uio_offset;
! 127: c = uio->uio_resid;
! 128: /* This doesn't allow device mapping! XXX */
! 129: pmap_real_memory(&v, &c);
! 130: error = uiomove((caddr_t)v, c, uio);
! 131: continue;
! 132:
! 133: /* minor device 1 is kernel memory */
! 134: case 1:
! 135: v = uio->uio_offset;
! 136: c = min(iov->iov_len, MAXPHYS);
! 137: error = uiomove((caddr_t)v, c, uio);
! 138: continue;
! 139:
! 140: /* minor device 2 is EOF/RATHOLE */
! 141: case 2:
! 142: if (uio->uio_rw == UIO_WRITE)
! 143: uio->uio_resid = 0;
! 144: return 0;
! 145:
! 146: /* minor device 12 (/dev/zero) is source of nulls on read,
! 147: * rathole on write
! 148: */
! 149: case 12:
! 150: if (uio->uio_rw == UIO_WRITE) {
! 151: c = iov->iov_len;
! 152: break;
! 153: }
! 154: if (zeropage == NULL) {
! 155: zeropage = (caddr_t)malloc(PAGE_SIZE, M_TEMP,
! 156: M_WAITOK);
! 157: bzero(zeropage, PAGE_SIZE);
! 158: }
! 159: c = min(iov->iov_len, PAGE_SIZE);
! 160: error = uiomove(zeropage, c, uio);
! 161: continue;
! 162:
! 163: default:
! 164: return ENXIO;
! 165: }
! 166: if (error)
! 167: break;
! 168: iov->iov_base += c;
! 169: iov->iov_len -= c;
! 170: uio->uio_offset += c;
! 171: uio->uio_resid -= c;
! 172: }
! 173: return error;
! 174: }
! 175:
! 176: paddr_t
! 177: mmmmap(dev_t dev, off_t off, int prot)
! 178: {
! 179: return (-1);
! 180: }
! 181:
! 182: /*ARGSUSED*/
! 183: int
! 184: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
! 185: {
! 186: return (EOPNOTSUPP);
! 187: }
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