1/*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department, and code derived from software contributed to 9 * Berkeley by William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 37 */ 38 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD$"); 41 42/* 43 * Memory special file 44 */ 45 46#include <sys/param.h> 47#include <sys/conf.h> 48#include <sys/fcntl.h> 49#include <sys/kernel.h> 50#include <sys/lock.h> 51#include <sys/malloc.h> 52#include <sys/memrange.h> 53#include <sys/module.h> 54#include <sys/msgbuf.h> 55#include <sys/mutex.h> 56#include <sys/proc.h> 57#include <sys/signalvar.h> 58#include <sys/systm.h> 59#include <sys/uio.h> 60 61#include <machine/cpu.h> 62#include <machine/frame.h> 63 64#include <vm/vm.h> 65#include <vm/pmap.h> 66#include <vm/vm_extern.h> 67 68#include <machine/memdev.h> 69 70struct mem_range_softc mem_range_softc; 71 72static __inline int 73ia64_pa_access(vm_offset_t pa) 74{ 75 return (VM_PROT_READ|VM_PROT_WRITE); 76} 77 78/* ARGSUSED */ 79int 80memrw(struct cdev *dev, struct uio *uio, int flags) 81{ 82 struct iovec *iov; 83 vm_offset_t addr, eaddr, o, v; 84 int c, error, rw; 85 86 error = 0; 87 while (uio->uio_resid > 0 && !error) { 88 iov = uio->uio_iov; 89 if (iov->iov_len == 0) { 90 uio->uio_iov++; 91 uio->uio_iovcnt--; 92 if (uio->uio_iovcnt < 0) 93 panic("memrw"); 94 continue; 95 } 96 97 if (dev2unit(dev) == CDEV_MINOR_MEM) { 98 v = uio->uio_offset; 99kmemphys: 100 /* Allow reads only in RAM. */ 101 rw = (uio->uio_rw == UIO_READ) 102 ? VM_PROT_READ : VM_PROT_WRITE; 103 if ((ia64_pa_access(v) & rw) != rw) { 104 error = EFAULT; 105 c = 0; 106 break; 107 } 108 109 o = uio->uio_offset & PAGE_MASK; 110 c = min(uio->uio_resid, (int)(PAGE_SIZE - o)); 111 error = uiomove((caddr_t)IA64_PHYS_TO_RR7(v), c, uio); 112 continue; 113 } 114 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 115 v = uio->uio_offset; 116 117 if (v >= IA64_RR_BASE(6)) { 118 v = IA64_RR_MASK(v); 119 goto kmemphys; 120 } 121 122 c = min(iov->iov_len, MAXPHYS); 123 124 /* 125 * Make sure that all of the pages are currently 126 * resident so that we don't create any zero-fill 127 * pages. 128 */ 129 addr = trunc_page(v); 130 eaddr = round_page(v + c); 131 if (addr < VM_MAXUSER_ADDRESS) 132 return (EFAULT); 133 for (; addr < eaddr; addr += PAGE_SIZE) { 134 if (pmap_kextract(addr) == 0) 135 return (EFAULT); 136 } 137 if (!kernacc((caddr_t)v, c, (uio->uio_rw == UIO_READ) 138 ? VM_PROT_READ : VM_PROT_WRITE)) 139 return (EFAULT); 140 error = uiomove((caddr_t)v, c, uio); 141 continue; 142 } 143 /* else panic! */ 144 } 145 return (error); 146} 147 148/* 149 * allow user processes to MMAP some memory sections 150 * instead of going through read/write 151 */ 152int 153memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 154 int prot, vm_memattr_t *memattr) 155{ 156 /* 157 * /dev/mem is the only one that makes sense through this 158 * interface. For /dev/kmem any physaddr we return here 159 * could be transient and hence incorrect or invalid at 160 * a later time. 161 */ 162 if (dev2unit(dev) != CDEV_MINOR_MEM) 163 return (-1); 164 165 /* 166 * Allow access only in RAM. 167 */ 168 if ((prot & ia64_pa_access(atop((vm_offset_t)offset))) != prot) 169 return (-1); 170 *paddr = IA64_PHYS_TO_RR7(offset); 171 return (0); 172} 173