mem.c revision 221869
155714Skris/*- 2109998Smarkm * Copyright (c) 1988 University of Utah. 3109998Smarkm * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4109998Smarkm * All rights reserved. 5109998Smarkm * 6109998Smarkm * This code is derived from software contributed to Berkeley by 7109998Smarkm * the Systems Programming Group of the University of Utah Computer 8109998Smarkm * Science Department, and code derived from software contributed to 9109998Smarkm * Berkeley by William Jolitz. 10109998Smarkm * 11109998Smarkm * Redistribution and use in source and binary forms, with or without 12109998Smarkm * modification, are permitted provided that the following conditions 13109998Smarkm * are met: 14109998Smarkm * 1. Redistributions of source code must retain the above copyright 15109998Smarkm * notice, this list of conditions and the following disclaimer. 16109998Smarkm * 2. Redistributions in binary form must reproduce the above copyright 17109998Smarkm * notice, this list of conditions and the following disclaimer in the 18109998Smarkm * documentation and/or other materials provided with the distribution. 19109998Smarkm * 4. Neither the name of the University nor the names of its contributors 20109998Smarkm * may be used to endorse or promote products derived from this software 21109998Smarkm * without specific prior written permission. 22109998Smarkm * 23109998Smarkm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24109998Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25109998Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26109998Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27109998Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28109998Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29109998Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30109998Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3155714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3255714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3355714Skris * SUCH DAMAGE. 3455714Skris * 3555714Skris * from: Utah $Hdr: mem.c 1.13 89/10/08$ 3655714Skris * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 37296341Sdelphij * from: FreeBSD: src/sys/i386/i386/mem.c,v 1.94 2001/09/26 3855714Skris */ 3955714Skris 4055714Skris#include <sys/cdefs.h> 4155714Skris__FBSDID("$FreeBSD: head/sys/sparc64/sparc64/mem.c 221869 2011-05-14 01:53:38Z attilio $"); 4255714Skris 4355714Skris/* 44296341Sdelphij * Memory special file 4555714Skris * 4655714Skris * NOTE: other architectures support mmap()'ing the mem and kmem devices; this 4755714Skris * might cause illegal aliases to be created for the locked kernel page(s), so 4855714Skris * it is not implemented. 4955714Skris */ 5055714Skris 51296341Sdelphij#include <sys/param.h> 5255714Skris#include <sys/conf.h> 5355714Skris#include <sys/fcntl.h> 5455714Skris#include <sys/kernel.h> 5555714Skris#include <sys/lock.h> 5655714Skris#include <sys/malloc.h> 5755714Skris#include <sys/memrange.h> 5855714Skris#include <sys/module.h> 5955714Skris#include <sys/mutex.h> 6055714Skris#include <sys/proc.h> 6155714Skris#include <sys/signalvar.h> 6255714Skris#include <sys/systm.h> 6355714Skris#include <sys/uio.h> 6455714Skris 6555714Skris#include <vm/vm.h> 66296341Sdelphij#include <vm/vm_param.h> 6755714Skris#include <vm/vm_page.h> 6855714Skris#include <vm/vm_kern.h> 69296341Sdelphij#include <vm/pmap.h> 7055714Skris#include <vm/vm_extern.h> 7155714Skris 7255714Skris#include <machine/cache.h> 7355714Skris#include <machine/md_var.h> 7455714Skris#include <machine/pmap.h> 7555714Skris#include <machine/tlb.h> 7655714Skris 7755714Skris#include <machine/memdev.h> 7855714Skris 7955714Skrisstruct mem_range_softc mem_range_softc; 8055714Skris 81296341Sdelphij/* ARGSUSED */ 8255714Skrisint 8355714Skrismemrw(struct cdev *dev, struct uio *uio, int flags) 8455714Skris{ 8555714Skris struct iovec *iov; 8655714Skris vm_offset_t eva; 87109998Smarkm vm_offset_t off; 88109998Smarkm vm_offset_t ova; 89109998Smarkm vm_offset_t va; 90109998Smarkm vm_prot_t prot; 91109998Smarkm vm_paddr_t pa; 92109998Smarkm vm_size_t cnt; 93109998Smarkm vm_page_t m; 94109998Smarkm int error; 95296341Sdelphij int i; 96109998Smarkm uint32_t colors; 97109998Smarkm 98109998Smarkm cnt = 0; 99109998Smarkm colors = 1; 100109998Smarkm error = 0; 101109998Smarkm ova = 0; 102109998Smarkm 103109998Smarkm GIANT_REQUIRED; 104109998Smarkm 105109998Smarkm while (uio->uio_resid > 0 && error == 0) { 106109998Smarkm iov = uio->uio_iov; 107109998Smarkm if (iov->iov_len == 0) { 108109998Smarkm uio->uio_iov++; 109109998Smarkm uio->uio_iovcnt--; 110109998Smarkm if (uio->uio_iovcnt < 0) 111109998Smarkm panic("memrw"); 112109998Smarkm continue; 113109998Smarkm } 114109998Smarkm if (dev2unit(dev) == CDEV_MINOR_MEM) { 115109998Smarkm pa = uio->uio_offset & ~PAGE_MASK; 116109998Smarkm if (!is_physical_memory(pa)) { 117109998Smarkm error = EFAULT; 118109998Smarkm break; 119109998Smarkm } 120109998Smarkm 121109998Smarkm off = uio->uio_offset & PAGE_MASK; 122109998Smarkm cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 123109998Smarkm PAGE_MASK); 124109998Smarkm cnt = ulmin(cnt, PAGE_SIZE - off); 125109998Smarkm cnt = ulmin(cnt, iov->iov_len); 126109998Smarkm 127109998Smarkm m = NULL; 128109998Smarkm for (i = 0; phys_avail[i] != 0; i += 2) { 129109998Smarkm if (pa >= phys_avail[i] && 130109998Smarkm pa < phys_avail[i + 1]) { 131109998Smarkm m = PHYS_TO_VM_PAGE(pa); 132109998Smarkm break; 133109998Smarkm } 134109998Smarkm } 135109998Smarkm 136109998Smarkm if (m != NULL) { 137109998Smarkm if (ova == 0) { 138109998Smarkm if (dcache_color_ignore == 0) 139109998Smarkm colors = DCACHE_COLORS; 14055714Skris ova = kmem_alloc_wait(kernel_map, 141160814Ssimon PAGE_SIZE * colors); 14255714Skris } 14355714Skris if (colors != 1 && m->md.color != -1) 144109998Smarkm va = ova + m->md.color * PAGE_SIZE; 145296341Sdelphij else 146296341Sdelphij va = ova; 147296341Sdelphij pmap_qenter(va, &m, 1); 148296341Sdelphij error = uiomove((void *)(va + off), cnt, 149296341Sdelphij uio); 150296341Sdelphij pmap_qremove(va, 1); 151296341Sdelphij } else { 152296341Sdelphij va = TLB_PHYS_TO_DIRECT(pa); 153296341Sdelphij error = uiomove((void *)(va + off), cnt, 154296341Sdelphij uio); 155296341Sdelphij } 156296341Sdelphij break; 157296341Sdelphij } else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 158296341Sdelphij va = trunc_page(uio->uio_offset); 159296341Sdelphij eva = round_page(uio->uio_offset + iov->iov_len); 160296341Sdelphij 161296341Sdelphij /* 162296341Sdelphij * Make sure that all of the pages are currently 163296341Sdelphij * resident so we don't create any zero fill pages. 164296341Sdelphij */ 165296341Sdelphij for (; va < eva; va += PAGE_SIZE) 16655714Skris if (pmap_kextract(va) == 0) 167109998Smarkm return (EFAULT); 168109998Smarkm 169109998Smarkm prot = (uio->uio_rw == UIO_READ) ? VM_PROT_READ : 170296341Sdelphij VM_PROT_WRITE; 171296341Sdelphij va = uio->uio_offset; 172296341Sdelphij if (va < VM_MIN_DIRECT_ADDRESS && 173296341Sdelphij kernacc((void *)va, iov->iov_len, prot) == FALSE) 174109998Smarkm return (EFAULT); 175109998Smarkm 176109998Smarkm error = uiomove((void *)va, iov->iov_len, uio); 177109998Smarkm break; 178109998Smarkm } 179109998Smarkm /* else panic! */ 180296341Sdelphij } 181296341Sdelphij if (ova != 0) 182296341Sdelphij kmem_free_wakeup(kernel_map, ova, PAGE_SIZE * colors); 183109998Smarkm return (error); 184296341Sdelphij} 185296341Sdelphij