/*- * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department, and code derived from software contributed to * Berkeley by William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: mem.c 1.13 89/10/08$ * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 * $Id: mem.c,v 1.3 1993/10/16 14:15:06 rgrimes Exp $ */ /* * Memory special file */ #include "param.h" #include "conf.h" #include "buf.h" #include "systm.h" #include "uio.h" #include "malloc.h" #include "proc.h" #include "machine/cpu.h" #include "machine/psl.h" #include "vm/vm_param.h" #include "vm/lock.h" #include "vm/vm_statistics.h" #include "vm/pmap.h" #include "vm/vm_prot.h" extern char *vmmap; /* poor name! */ /*ARGSUSED*/ mmclose(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { struct syscframe *fp; switch (minor(dev)) { case 14: fp = (struct syscframe *)curproc->p_regs; fp->sf_eflags &= ~PSL_IOPL; break; default: break; } return(0); } /*ARGSUSED*/ mmopen(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { struct syscframe *fp; switch (minor(dev)) { case 14: fp = (struct syscframe *)curproc->p_regs; fp->sf_eflags |= PSL_IOPL; break; default: break; } return(0); } /*ARGSUSED*/ mmrw(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { register int o; register u_int c, v; register struct iovec *iov; int error = 0; caddr_t zbuf = NULL; while (uio->uio_resid > 0 && error == 0) { iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("mmrw"); continue; } switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: v = uio->uio_offset; pmap_enter(pmap_kernel(), vmmap, v, uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE, TRUE); o = (int)uio->uio_offset & PGOFSET; c = (u_int)(NBPG - ((int)iov->iov_base & PGOFSET)); c = MIN(c, (u_int)(NBPG - o)); c = MIN(c, (u_int)iov->iov_len); error = uiomove((caddr_t)&vmmap[o], (int)c, uio); pmap_remove(pmap_kernel(), vmmap, &vmmap[NBPG]); continue; /* minor device 1 is kernel memory */ case 1: c = iov->iov_len; if (!kernacc((caddr_t)uio->uio_offset, c, uio->uio_rw == UIO_READ ? B_READ : B_WRITE)) return(EFAULT); error = uiomove((caddr_t)uio->uio_offset, (int)c, uio); continue; /* minor device 2 is EOF/RATHOLE */ case 2: if (uio->uio_rw == UIO_READ) return (0); c = iov->iov_len; break; /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */ case 12: if (uio->uio_rw == UIO_WRITE) { c = iov->iov_len; break; } if (zbuf == NULL) { zbuf = (caddr_t) malloc(CLBYTES, M_TEMP, M_WAITOK); bzero(zbuf, CLBYTES); } c = MIN(iov->iov_len, CLBYTES); error = uiomove(zbuf, (int)c, uio); continue; #ifdef notyet /* 386 I/O address space (/dev/ioport[bwl]) is a read/write access to seperate i/o device address bus, different than memory bus. Semantics here are very different than ordinary read/write, as if iov_len is a multiple an implied string move from a single port will be done. Note that lseek must be used to set the port number reliably. */ case 14: if (iov->iov_len == 1) { u_char tmp; tmp = inb(uio->uio_offset); error = uiomove (&tmp, iov->iov_len, uio); } else { if (!useracc((caddr_t)iov->iov_base, iov->iov_len, uio->uio_rw)) return (EFAULT); insb(uio->uio_offset, iov->iov_base, iov->iov_len); } break; case 15: if (iov->iov_len == sizeof (short)) { u_short tmp; tmp = inw(uio->uio_offset); error = uiomove (&tmp, iov->iov_len, uio); } else { if (!useracc((caddr_t)iov->iov_base, iov->iov_len, uio->uio_rw)) return (EFAULT); insw(uio->uio_offset, iov->iov_base, iov->iov_len/ sizeof (short)); } break; case 16: if (iov->iov_len == sizeof (long)) { u_long tmp; tmp = inl(uio->uio_offset); error = uiomove (&tmp, iov->iov_len, uio); } else { if (!useracc((caddr_t)iov->iov_base, iov->iov_len, uio->uio_rw)) return (EFAULT); insl(uio->uio_offset, iov->iov_base, iov->iov_len/ sizeof (long)); } break; #endif default: return (ENXIO); } if (error) break; iov->iov_base += c; iov->iov_len -= c; uio->uio_offset += c; uio->uio_resid -= c; } if (zbuf) free(zbuf, M_TEMP); return (error); }