Annotation of sys/arch/hp300/hp300/mem.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.23 2005/10/28 09:07:48 martin Exp $ */
! 2: /* $NetBSD: mem.c,v 1.25 1999/03/27 00:30:06 mycroft 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/systm.h>
! 46: #include <sys/buf.h>
! 47: #include <sys/conf.h>
! 48: #include <sys/malloc.h>
! 49: #include <sys/proc.h>
! 50: #include <sys/uio.h>
! 51:
! 52: #include <machine/cpu.h>
! 53:
! 54: #include <uvm/uvm_extern.h>
! 55:
! 56: extern u_int lowram;
! 57: extern char *extiobase;
! 58: extern int eiomapsize;
! 59: static caddr_t devzeropage;
! 60:
! 61: #define mmread mmrw
! 62: #define mmwrite mmrw
! 63: cdev_decl(mm);
! 64:
! 65: /*ARGSUSED*/
! 66: int
! 67: mmopen(dev, flag, mode, p)
! 68: dev_t dev;
! 69: int flag, mode;
! 70: struct proc *p;
! 71: {
! 72:
! 73: switch (minor(dev)) {
! 74: case 0:
! 75: case 1:
! 76: case 2:
! 77: case 12:
! 78: return (0);
! 79: default:
! 80: return (ENXIO);
! 81: }
! 82: }
! 83:
! 84: /*ARGSUSED*/
! 85: int
! 86: mmclose(dev, flag, mode, p)
! 87: dev_t dev;
! 88: int flag, mode;
! 89: struct proc *p;
! 90: {
! 91:
! 92: return (0);
! 93: }
! 94:
! 95: /*ARGSUSED*/
! 96: int
! 97: mmrw(dev, uio, flags)
! 98: dev_t dev;
! 99: struct uio *uio;
! 100: int flags;
! 101: {
! 102: vaddr_t o, v;
! 103: int c;
! 104: struct iovec *iov;
! 105: int error = 0;
! 106: static int physlock;
! 107: vm_prot_t prot;
! 108:
! 109: if (minor(dev) == 0) {
! 110: /* lock against other uses of shared vmmap */
! 111: while (physlock > 0) {
! 112: physlock++;
! 113: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
! 114: "mmrw", 0);
! 115: if (error)
! 116: return (error);
! 117: }
! 118: physlock = 1;
! 119: }
! 120: while (uio->uio_resid > 0 && error == 0) {
! 121: iov = uio->uio_iov;
! 122: if (iov->iov_len == 0) {
! 123: uio->uio_iov++;
! 124: uio->uio_iovcnt--;
! 125: if (uio->uio_iovcnt < 0)
! 126: panic("mmrw");
! 127: continue;
! 128: }
! 129: switch (minor(dev)) {
! 130:
! 131: /* minor device 0 is physical memory */
! 132: case 0:
! 133: v = uio->uio_offset;
! 134:
! 135: /*
! 136: * Only allow reads in physical RAM.
! 137: */
! 138: if (v >= 0xFFFFFFFC || v < lowram) {
! 139: error = EFAULT;
! 140: goto unlock;
! 141: }
! 142:
! 143: prot = uio->uio_rw == UIO_READ ? VM_PROT_READ :
! 144: VM_PROT_WRITE;
! 145: pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
! 146: trunc_page(v), prot, prot|PMAP_WIRED);
! 147: pmap_update(pmap_kernel());
! 148: o = uio->uio_offset & PGOFSET;
! 149: c = min(uio->uio_resid, (int)(NBPG - o));
! 150: error = uiomove((caddr_t)vmmap + o, c, uio);
! 151: pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
! 152: (vaddr_t)vmmap + NBPG);
! 153: pmap_update(pmap_kernel());
! 154: continue;
! 155:
! 156: /* minor device 1 is kernel memory */
! 157: case 1:
! 158: v = uio->uio_offset;
! 159: c = min(iov->iov_len, MAXPHYS);
! 160: if (!uvm_kernacc((caddr_t)v, c,
! 161: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
! 162: return (EFAULT);
! 163:
! 164: /*
! 165: * Don't allow reading intio or dio
! 166: * device space. This could lead to
! 167: * corruption of device registers.
! 168: */
! 169: if (ISIIOVA(v) ||
! 170: ((caddr_t)v >= extiobase &&
! 171: (caddr_t)v < (extiobase + (eiomapsize * NBPG))))
! 172: return (EFAULT);
! 173:
! 174: error = uiomove((caddr_t)v, c, uio);
! 175: continue;
! 176:
! 177: /* minor device 2 is EOF/RATHOLE */
! 178: case 2:
! 179: if (uio->uio_rw == UIO_WRITE)
! 180: uio->uio_resid = 0;
! 181: return (0);
! 182:
! 183: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
! 184: case 12:
! 185: if (uio->uio_rw == UIO_WRITE) {
! 186: c = iov->iov_len;
! 187: break;
! 188: }
! 189: /*
! 190: * On the first call, allocate and zero a page
! 191: * of memory for use with /dev/zero.
! 192: */
! 193: if (devzeropage == NULL) {
! 194: devzeropage = (caddr_t)
! 195: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
! 196: bzero(devzeropage, PAGE_SIZE);
! 197: }
! 198: c = min(iov->iov_len, PAGE_SIZE);
! 199: error = uiomove(devzeropage, c, uio);
! 200: continue;
! 201:
! 202: default:
! 203: return (ENXIO);
! 204: }
! 205: if (error)
! 206: break;
! 207: iov->iov_base = (caddr_t)iov->iov_base + c;
! 208: iov->iov_len -= c;
! 209: uio->uio_offset += c;
! 210: uio->uio_resid -= c;
! 211: }
! 212: if (minor(dev) == 0) {
! 213: unlock:
! 214: if (physlock > 1)
! 215: wakeup((caddr_t)&physlock);
! 216: physlock = 0;
! 217: }
! 218: return (error);
! 219: }
! 220:
! 221: paddr_t
! 222: mmmmap(dev, off, prot)
! 223: dev_t dev;
! 224: off_t off;
! 225: int prot;
! 226: {
! 227: /*
! 228: * /dev/mem is the only one that makes sense through this
! 229: * interface. For /dev/kmem any physaddr we return here
! 230: * could be transient and hence incorrect or invalid at
! 231: * a later time. /dev/null just doesn't make any sense
! 232: * and /dev/zero is a hack that is handled via the default
! 233: * pager in mmap().
! 234: */
! 235: if (minor(dev) != 0)
! 236: return (-1);
! 237:
! 238: /*
! 239: * Allow access only in RAM.
! 240: */
! 241: if ((u_int)off < lowram || (u_int)off >= 0xFFFFFFFC)
! 242: return (-1);
! 243: return (atop(off));
! 244: }
! 245:
! 246: int
! 247: mmioctl(dev, cmd, data, flags, p)
! 248: dev_t dev;
! 249: u_long cmd;
! 250: caddr_t data;
! 251: int flags;
! 252: struct proc *p;
! 253: {
! 254: return (EOPNOTSUPP);
! 255: }
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