X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/e5568f75972dfc723778653c11cb6b4dc825716a..4b17d6b6e417f714551ec129064745ea9919780e:/bsd/dev/i386/mem.c diff --git a/bsd/dev/i386/mem.c b/bsd/dev/i386/mem.c index 5c3422a64..61f0d6929 100644 --- a/bsd/dev/i386/mem.c +++ b/bsd/dev/i386/mem.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 1988 University of Utah. @@ -70,63 +76,97 @@ #include #include #include -#include #include +#include #include -#include +#include #include #include #include #include /* for kernel_map */ +extern addr64_t kvtophys(vm_offset_t va); +extern boolean_t kernacc(off_t, size_t ); +#if !defined(SECURE_KERNEL) +extern int setup_kmem; +#endif + static caddr_t devzerobuf; -mmread(dev, uio) - dev_t dev; - struct uio *uio; +int mmread(dev_t dev, struct uio *uio); +int mmwrite(dev_t dev, struct uio *uio); +int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p); +int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw); + +int +mmread(dev_t dev, struct uio *uio) { return (mmrw(dev, uio, UIO_READ)); } -mmwrite(dev, uio) - dev_t dev; - struct uio *uio; +int +mmwrite(dev_t dev, struct uio *uio) { return (mmrw(dev, uio, UIO_WRITE)); } -mmrw(dev, uio, rw) - dev_t dev; - struct uio *uio; - enum uio_rw rw; +int +mmioctl(dev_t dev, u_long cmd, __unused caddr_t data, + __unused int flag, __unused struct proc *p) +{ + int minnum = minor(dev); + + if (0 == minnum || 1 == minnum) { + /* /dev/mem and /dev/kmem */ +#if defined(SECURE_KERNEL) + return (ENODEV); +#else + if (0 == setup_kmem) + return (EINVAL); +#endif + } + + switch (cmd) { + case FIONBIO: + case FIOASYNC: + /* OK to do nothing: we always return immediately */ + break; + default: + return ENODEV; + } + + return (0); +} + +int +mmrw(dev_t dev, struct uio *uio, enum uio_rw rw) { register int o; register u_int c, v; - register struct iovec *iov; int error = 0; vm_offset_t where; - int spl; vm_size_t size; - extern boolean_t kernacc(off_t, size_t ); - - 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; - } + + + while (uio_resid(uio) > 0 && error == 0) { + uio_update(uio, 0); + switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: +#if defined(SECURE_KERNEL) + return(ENODEV); +#else + if (setup_kmem == 0) + return(ENODEV); +#endif + v = trunc_page(uio->uio_offset); - if (uio->uio_offset >= mem_size) + if (uio->uio_offset >= (off_t)mem_size) goto fault; size= PAGE_SIZE; @@ -135,28 +175,35 @@ mmrw(dev, uio, rw) goto fault; } o = uio->uio_offset - v; - c = min(PAGE_SIZE - o, (u_int)iov->iov_len); + c = min(PAGE_SIZE - o, uio_curriovlen(uio)); error = uiomove((caddr_t) (where + o), c, uio); kmem_free(kernel_map, where, PAGE_SIZE); continue; /* minor device 1 is kernel memory */ case 1: +#if defined(SECURE_KERNEL) + return(ENODEV); +#else + if (setup_kmem == 0) + return(ENODEV); +#endif /* Do some sanity checking */ if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) || - ((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS)) + ((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_AND_KEXT_ADDRESS)) goto fault; - c = iov->iov_len; + c = uio_curriovlen(uio); if (!kernacc(uio->uio_offset, c)) goto fault; - error = uiomove((caddr_t)uio->uio_offset, (int)c, uio); + error = uiomove((caddr_t)(uintptr_t)uio->uio_offset, + (int)c, uio); continue; /* minor device 2 is EOF/RATHOLE */ case 2: if (rw == UIO_READ) return (0); - c = iov->iov_len; + c = uio_curriovlen(uio); break; case 3: if(devzerobuf == NULL) { @@ -164,10 +211,10 @@ mmrw(dev, uio, rw) bzero(devzerobuf, PAGE_SIZE); } if(uio->uio_rw == UIO_WRITE) { - c = iov->iov_len; + c = uio_curriovlen(uio); break; } - c = min(iov->iov_len, PAGE_SIZE); + c = min(uio_curriovlen(uio), PAGE_SIZE); error = uiomove(devzerobuf, (int)c, uio); continue; default: @@ -177,10 +224,7 @@ mmrw(dev, uio, rw) if (error) break; - iov->iov_base += c; - iov->iov_len -= c; - uio->uio_offset += c; - uio->uio_resid -= c; + uio_update(uio, c); } return (error); fault: @@ -201,7 +245,7 @@ kernacc( end = start + len; while (base < end) { - if(kvtophys((vm_offset_t)base) == NULL) + if(kvtophys((vm_offset_t)base) == 0ULL) return(FALSE); base += page_size; }