Download Writing Windows VxDs and Device Drivers, by Karen Hazzah PDF

By Karen Hazzah

Software program developer and writer Karen Hazzah expands her unique treatise on machine drivers within the moment version of Writing home windows VxDs and gadget Drivers. The e-book and significant other disk comprise the author's library of wrapper capabilities that let the progr discover why MSDN has referred to as this e-book 'the purely fairly systematic and thorough creation to VxD writing.' For this moment version, Karen Hazzah has integrated extended assurance of home windows ninety five.

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3 Illustrates the relationship between the current VM handle, the VM control block, and the Client Register Structure. Register values when VxD control procedure is invoked* Current VM Control Block EBX Current VM Handle CB_Client_Pointer EAX Message Code EBP Client Reg. Structure * Not all messages Client Register Structure Introduction to VxDs — 47 Event Notification Once real mode initialization is complete, the VMM will notify the VxD about relevant events through a special message interface.

This redirection causes writes to the video buffer to appear in a window instead of on the full screen. The VxD in Chapter 8 uses this same mechanism to arbitrate access to another memory-mapped device, a monochrome adapter. Trapping Interrupts and Exceptions In addition to trapping memory and I/O references, Windows 95 traps certain “privileged” instructions. “Privileged” instructions are those that could be used to bypass the processor’s protection features or that could interfere with the integrity of the virtual machine.

For the most part, Windows 95 traps these instructions to protect the integrity of the VM. In the instance of the INT instructions, Windows 95 exploits the trap to transparently intercept DOS and BIOS calls. Processes running in a VM execute with Ring 3 (least privileged) permissions. Code executing at Ring 3 causes an exception when executing one of these “privileged” instructions. When this exception is raised, the processor switches to Ring 0 and then transfers control to an appropriate handler.

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