X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..cf03f5cdc65293b4cb5eba3ed23fed26dad903c9:/iokit/bsddev/IOKitBSDInit.cpp

diff --git a/iokit/bsddev/IOKitBSDInit.cpp b/iokit/bsddev/IOKitBSDInit.cpp
index c125eaeae..0900a0985 100644
--- a/iokit/bsddev/IOKitBSDInit.cpp
+++ b/iokit/bsddev/IOKitBSDInit.cpp
@@ -3,19 +3,22 @@
  *
  * @APPLE_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.
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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.
+ * 
+ * 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@
  */
@@ -36,6 +39,8 @@ extern "C" {
 // how long to wait for matching root device, secs
 #define ROOTDEVICETIMEOUT	60
 
+extern dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys);
+extern dev_t mdevlookup(int devid);
 
 kern_return_t
 IOKitBSDInit( void )
@@ -324,6 +329,8 @@ OSDictionary * IOOFPathMatching( const char * path, char * buf, int maxLen )
 
 }
 
+static int didRam = 0;
+
 kern_return_t IOFindBSDRoot( char * rootName,
 				dev_t * root, u_int32_t * oflags )
 {
@@ -334,6 +341,7 @@ kern_return_t IOFindBSDRoot( char * rootName,
     OSString *		iostr;
     OSNumber *		off;
     OSData *		data = 0;
+    UInt32		*ramdParms = 0;
 
     UInt32		flags = 0;
     int			minor, major;
@@ -346,6 +354,9 @@ kern_return_t IOFindBSDRoot( char * rootName,
     bool		debugInfoPrintedOnce = false;
 
     static int		mountAttempts = 0;
+				
+	int xchar, dchar;
+				
 
     if( mountAttempts++)
 	IOSleep( 5 * 1000 );
@@ -361,17 +372,15 @@ kern_return_t IOFindBSDRoot( char * rootName,
 
     do {
         if( (regEntry = IORegistryEntry::fromPath( "/chosen", gIODTPlane ))) {
-	    data = (OSData *) regEntry->getProperty( "rootpath" );
-	    regEntry->release();
-	    if( data)
-	    continue;
-	}
+			data = (OSData *) regEntry->getProperty( "rootpath" );
+			regEntry->release();
+			if( data) continue;
+		}
         if( (regEntry = IORegistryEntry::fromPath( "/options", gIODTPlane ))) {
-	    data = (OSData *) regEntry->getProperty( "boot-file" );
-	    regEntry->release();
-	    if( data)
-	    continue;
-	}
+			data = (OSData *) regEntry->getProperty( "boot-file" );
+			regEntry->release();
+			if( data) continue;
+		}
     } while( false );
 
     if( data)
@@ -379,14 +388,65 @@ kern_return_t IOFindBSDRoot( char * rootName,
 
     if( rdBootVar[0] == '*') {
         look = rdBootVar + 1;
-	forceNet = false;
+		forceNet = false;
     } else {
         if( (regEntry = IORegistryEntry::fromPath( "/", gIODTPlane ))) {
             forceNet = (0 != regEntry->getProperty( "net-boot" ));
-	    regEntry->release();
-	}
+	    	regEntry->release();
+		}
     }
 
+
+
+//
+//	See if we have a RAMDisk property in /chosen/memory-map.  If so, make it into a device.
+//	It will become /dev/mdx, where x is 0-f. 
+//
+
+	if(!didRam) {												/* Have we already build this ram disk? */
+		didRam = 1;												/* Remember we did this */
+		if((regEntry = IORegistryEntry::fromPath( "/chosen/memory-map", gIODTPlane ))) {	/* Find the map node */
+			data = (OSData *)regEntry->getProperty("RAMDisk");	/* Find the ram disk, if there */
+			if(data) {											/* We found one */
+
+				ramdParms = (UInt32 *)data->getBytesNoCopy();	/* Point to the ram disk base and size */
+				(void)mdevadd(-1, ramdParms[0] >> 12, ramdParms[1] >> 12, 0);	/* Initialize it and pass back the device number */
+			}
+			regEntry->release();								/* Toss the entry */
+		}
+	}
+	
+//
+//	Now check if we are trying to root on a memory device
+//
+
+	if((rdBootVar[0] == 'm') && (rdBootVar[1] == 'd') && (rdBootVar[3] == 0)) {
+		dchar = xchar = rdBootVar[2];							/* Get the actual device */
+		if((xchar >= '0') && (xchar <= '9')) xchar = xchar - '0';	/* If digit, convert */
+		else {
+			xchar = xchar & ~' ';								/* Fold to upper case */
+			if((xchar >= 'A') && (xchar <= 'F')) {				/* Is this a valid digit? */
+				xchar = (xchar & 0xF) + 9;						/* Convert the hex digit */
+				dchar = dchar | ' ';							/* Fold to lower case */
+			}
+			else xchar = -1;									/* Show bogus */
+		}
+		if(xchar >= 0) {										/* Do we have a valid memory device name? */
+			*root = mdevlookup(xchar);							/* Find the device number */
+			if(*root >= 0) {									/* Did we find one? */
+
+				rootName[0] = 'm';								/* Build root name */
+				rootName[1] = 'd';								/* Build root name */
+				rootName[2] = dchar;							/* Build root name */
+				rootName[3] = 0;								/* Build root name */
+				IOLog("BSD root: %s, major %d, minor %d\n", rootName, major(*root), minor(*root));
+				*oflags = 0;									/* Show that this is not network */
+				goto iofrootx;									/* Join common exit... */
+			}
+			panic("IOFindBSDRoot: specified root memory device, %s, has not been configured\n", rdBootVar);	/* Not there */
+		}
+	}
+
     if( look) {
 	// from OpenFirmware path
 	IOLog("From path: \"%s\", ", look);
@@ -397,8 +457,8 @@ kern_return_t IOFindBSDRoot( char * rootName,
             matching = IODiskMatching( look, str, kMaxPathBuf );
         }
     }
-
-    if( (!matching) && rdBootVar[0] ) {
+    
+      if( (!matching) && rdBootVar[0] ) {
 	// by BSD name
 	look = rdBootVar;
 	if( look[0] == '*')
@@ -510,6 +570,7 @@ kern_return_t IOFindBSDRoot( char * rootName,
 
     IOFree( str,  kMaxPathBuf + kMaxBootVar );
 
+iofrootx:
     if( (gIOKitDebug & (kIOLogDTree | kIOLogServiceTree | kIOLogMemory)) && !debugInfoPrintedOnce) {
 
 	IOService::getPlatform()->waitQuiet();