/* $NetBSD: mem.c,v 1.40 2007/03/04 09:23:29 macallan Exp $ */ /* * Copyright (c) 1982, 1986, 1990, 1993 * 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. * * 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. 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. * * @(#)mem.c 8.3 (Berkeley) 1/12/94 */ /* * Copyright (c) 1988 University of Utah. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. * * @(#)mem.c 8.3 (Berkeley) 1/12/94 */ /* * Memory special file */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: mem.c,v 1.40 2007/03/04 09:23:29 macallan Exp $"); #include "opt_sparc_arch.h" #include <sys/param.h> #include <sys/buf.h> #include <sys/systm.h> #include <sys/uio.h> #include <sys/malloc.h> #include <sys/proc.h> #include <sys/conf.h> #include <sparc/sparc/vaddrs.h> #include <machine/eeprom.h> #include <uvm/uvm_extern.h> extern vaddr_t prom_vstart; extern vaddr_t prom_vend; void *zeropage; dev_type_read(mmrw); dev_type_ioctl(mmioctl); const struct cdevsw mem_cdevsw = { nullopen, nullclose, mmrw, mmrw, mmioctl, nostop, notty, nopoll, nommap, nokqfilter, }; /*ARGSUSED*/ int mmrw(dev_t dev, struct uio *uio, int flags) { vaddr_t va; paddr_t pa; int o, c; struct iovec *iov; int error = 0; static int physlock; vm_prot_t prot; extern void *vmmap; if (minor(dev) == DEV_MEM) { /* lock against other uses of shared vmmap */ while (physlock > 0) { physlock++; error = tsleep((void *)&physlock, PZERO | PCATCH, "mmrw", 0); if (error) return (error); } physlock = 1; } while (uio->uio_resid > 0 && error == 0) { int n; iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("mmrw"); continue; } /* Note how much is still to go */ n = uio->uio_resid; switch (minor(dev)) { case DEV_MEM: pa = (paddr_t)uio->uio_offset; if (!pmap_pa_exists(pa)) { error = EFAULT; goto unlock; } prot = uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE; pmap_enter(pmap_kernel(), (vaddr_t)vmmap, trunc_page(pa), prot, prot|PMAP_WIRED); pmap_update(pmap_kernel()); o = uio->uio_offset & PGOFSET; c = min(uio->uio_resid, (int)(PAGE_SIZE - o)); error = uiomove((char *)vmmap + o, c, uio); pmap_remove(pmap_kernel(), (vaddr_t)vmmap, (vaddr_t)vmmap + PAGE_SIZE); pmap_update(pmap_kernel()); break; case DEV_KMEM: va = (vaddr_t)uio->uio_offset; if (va >= MSGBUF_VA && va < MSGBUF_VA+PAGE_SIZE) { c = min(iov->iov_len, 4096); } else if (va >= prom_vstart && va < prom_vend && uio->uio_rw == UIO_READ) { /* Allow read-only access to the PROM */ c = min(iov->iov_len, prom_vend - prom_vstart); } else { c = min(iov->iov_len, MAXPHYS); if (!uvm_kernacc((void *)va, c, uio->uio_rw == UIO_READ ? B_READ : B_WRITE)) return (EFAULT); } error = uiomove((void *)va, c, uio); break; case DEV_NULL: if (uio->uio_rw == UIO_WRITE) uio->uio_resid = 0; return (0); /* XXX should add sbus, etc */ #if defined(SUN4) case DEV_EEPROM: if (cputyp == CPU_SUN4) error = eeprom_uio(uio); else error = ENXIO; break; #endif /* SUN4 */ case DEV_ZERO: if (uio->uio_rw == UIO_WRITE) { uio->uio_resid = 0; return(0); } if (zeropage == NULL) { zeropage = (void *) malloc(PAGE_SIZE, M_TEMP, M_WAITOK); bzero(zeropage, PAGE_SIZE); } c = min(iov->iov_len, PAGE_SIZE); error = uiomove(zeropage, c, uio); break; default: return (ENXIO); } /* If we didn't make any progress (i.e. EOF), we're done here */ if (n == uio->uio_resid) break; } if (minor(dev) == 0) { unlock: if (physlock > 1) wakeup((void *)&physlock); physlock = 0; } return (error); }