Current Path : /sys/ia64/ia64/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/ia64/ia64/mem.c |
/*- * 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. * 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 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/ia64/ia64/mem.c 217519 2011-01-17 23:06:47Z jkim $"); /* * Memory special file */ #include <sys/param.h> #include <sys/conf.h> #include <sys/fcntl.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/memrange.h> #include <sys/module.h> #include <sys/msgbuf.h> #include <sys/mutex.h> #include <sys/proc.h> #include <sys/signalvar.h> #include <sys/systm.h> #include <sys/uio.h> #include <machine/cpu.h> #include <machine/frame.h> #include <vm/vm.h> #include <vm/pmap.h> #include <vm/vm_extern.h> #include <machine/memdev.h> struct mem_range_softc mem_range_softc; static __inline int ia64_pa_access(vm_offset_t pa) { return (VM_PROT_READ|VM_PROT_WRITE); } /* ARGSUSED */ int memrw(struct cdev *dev, struct uio *uio, int flags) { struct iovec *iov; vm_offset_t addr, eaddr, o, v; int c, error, rw; error = 0; while (uio->uio_resid > 0 && !error) { iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("memrw"); continue; } if (dev2unit(dev) == CDEV_MINOR_MEM) { v = uio->uio_offset; kmemphys: /* Allow reads only in RAM. */ rw = (uio->uio_rw == UIO_READ) ? VM_PROT_READ : VM_PROT_WRITE; if ((ia64_pa_access(v) & rw) != rw) { error = EFAULT; c = 0; break; } o = uio->uio_offset & PAGE_MASK; c = min(uio->uio_resid, (int)(PAGE_SIZE - o)); error = uiomove((caddr_t)IA64_PHYS_TO_RR7(v), c, uio); continue; } else if (dev2unit(dev) == CDEV_MINOR_KMEM) { v = uio->uio_offset; if (v >= IA64_RR_BASE(6)) { v = IA64_RR_MASK(v); goto kmemphys; } c = min(iov->iov_len, MAXPHYS); /* * Make sure that all of the pages are currently * resident so that we don't create any zero-fill * pages. */ addr = trunc_page(v); eaddr = round_page(v + c); for (; addr < eaddr; addr += PAGE_SIZE) { if (pmap_extract(kernel_pmap, addr) == 0) return (EFAULT); } if (!kernacc((caddr_t)v, c, (uio->uio_rw == UIO_READ) ? VM_PROT_READ : VM_PROT_WRITE)) return (EFAULT); error = uiomove((caddr_t)v, c, uio); continue; } /* else panic! */ } return (error); } /* * allow user processes to MMAP some memory sections * instead of going through read/write */ int memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int prot, vm_memattr_t *memattr) { /* * /dev/mem is the only one that makes sense through this * interface. For /dev/kmem any physaddr we return here * could be transient and hence incorrect or invalid at * a later time. */ if (dev2unit(dev) != CDEV_MINOR_MEM) return (-1); /* * Allow access only in RAM. */ if ((prot & ia64_pa_access(atop((vm_offset_t)offset))) != prot) return (-1); *paddr = IA64_PHYS_TO_RR7(offset); return (0); }