xnu-2050.24.15.tar.gz

[apple/xnu.git] / bsd / dev / i386 / mem.c

diff --git a/bsd/dev/i386/mem.c b/bsd/dev/i386/mem.c
index f491b76eac7de83fd707b4fda32f44612cadb10c..61f0d692994acbd0211779d6455621056fdd862f 100644 (file)
--- a/bsd/dev/i386/mem.c
+++ b/bsd/dev/i386/mem.c
@@ -1,14 +1,19 @@
 /*
  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ * 
+ * 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
@@ -18,7 +23,7 @@
  * 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.
@@ -72,6 +77,7 @@
 #include <sys/dir.h>
 #include <sys/proc.h>
 #include <sys/systm.h>
+#include <sys/conf.h>
 #include <sys/vm.h>
 #include <sys/uio_internal.h>
 #include <sys/malloc.h>
@@ -80,8 +86,11 @@
 #include <mach/vm_param.h>
 #include <vm/vm_kern.h>                /* for kernel_map */
 
-extern vm_offset_t kvtophys(vm_offset_t va); 
+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;
 
@@ -105,9 +114,21 @@ mmwrite(dev_t dev, struct uio *uio)
 }
 
 int
-mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data, 
+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:
@@ -129,20 +150,23 @@ mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
        vm_offset_t     where;
        vm_size_t size;
 
+
        while (uio_resid(uio) > 0 && error == 0) {
-               if (uio_iov_len(uio) == 0) {
-                       uio_next_iov(uio);
-                       uio->uio_iovcnt--;
-                       if (uio->uio_iovcnt < 0)
-                               panic("mmrw");
-                       continue;
-               }
+               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;
@@ -151,19 +175,24 @@ mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
                                goto fault;
                        }
                        o = uio->uio_offset - v;
-                       // LP64todo - fix this!
-                       c = min(PAGE_SIZE - o, (u_int)uio_iov_len(uio));
+                       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 = uio_iov_len(uio);
+                       c = uio_curriovlen(uio);
                        if (!kernacc(uio->uio_offset, c))
                                goto fault;
                        error = uiomove((caddr_t)(uintptr_t)uio->uio_offset,
@@ -174,7 +203,7 @@ mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
                case 2:
                        if (rw == UIO_READ)
                                return (0);
-                       c = uio_iov_len(uio);
+                       c = uio_curriovlen(uio);
                        break;
                case 3:
                        if(devzerobuf == NULL) {
@@ -182,11 +211,10 @@ mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
                                bzero(devzerobuf, PAGE_SIZE);
                        }
                        if(uio->uio_rw == UIO_WRITE) {
-                               c = uio_iov_len(uio);
+                               c = uio_curriovlen(uio);
                                break;
                        }
-                       // LP64todo - fix this!
-                       c = min(uio_iov_len(uio), PAGE_SIZE);
+                       c = min(uio_curriovlen(uio), PAGE_SIZE);
                        error = uiomove(devzerobuf, (int)c, uio);
                        continue;
                default:
@@ -196,10 +224,7 @@ mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
                        
                if (error)
                        break;
-               uio_iov_base_add(uio, c);
-               uio_iov_len_add(uio, -((int)c));
-               uio->uio_offset += c;
-               uio_setresid(uio, (uio_resid(uio) - c));
+               uio_update(uio, c);
        }
        return (error);
 fault: