Microkernel White Paper

Microkernel White Paper Preliminary and Confidential Macintosh System Software Apple Computer, Inc. Copyright (©) 1992-1995 Apple Computer, Inc. ABOUT THE MICROKERNEL ...................................8 KERNEL OBJECTS AND IDS....................................................9 NAMING ......................................................................................11 EXECUTION - TASKING AND INTERRUPTS.....................12 ABOUT EXECUTION ..........................................................................................................12 ABOUT TASKS ...................................................................................................................13 ABOUT TASK SCHEDULING ..............................................................................................14 ABOUT SOFTWARE INTERRUPTS ......................................................................................15 ABOUT PRIVILEGED EXECUTION ......................................................................................16 ABOUT SYNCHRONIZATION ..............................................................................................16 ABOUT INTERRUPTS .........................................................................................................17 KERNELPROCESSES ...............................................................19 ADDRESS SPACE MANAGEMENT .......................................20 ABOUT ADDRESSING ........................................................................................................20 THE SYSTEM 7 ADDRESSING MODEL ...............................................................................21 THE MICROKERNEL ADDRESSING MODEL .......................................................................22 Multiple Address Spaces ...............................................................................................22 Areas .............................................................................................................................22 Paging ...........................................................................................................................23 Global Areas .................................................................................................................23 I/O Coordination...........................................................................................................24 Addressing And Execution ............................................................................................24 Inter-Address Space Access ..........................................................................................24 Code Fragment Manager Contexts...............................................................................25 SYNCHRONIZATION MECHANISMS ..................................26 MESSAGING...............................................................................28 MESSAGES ...........................................................…