mjg59 | Explaining Intel Rapid Start Technology
Recent Intel-based systems often implement something called Intel Rapid Start Technology. Like many things with the word "Technology" in the name, there's a large part of this that's marketing. The relatively small amount of technical documentation available implies that it's tied to your motherboard chipset and CPU, but as far as I can tell it's entirely implemented in firmware and could work jus
mjg59 | Oracle continue to circumvent EXPORT_SYMBOL_GPL()
Oracle won their appeal regarding whether APIs are copyrightable. There'll be ongoing argument about whether Google's use of those APIs is fair use or not, and perhaps an appeal to the Supreme Court, but that's the new status quo. This will doubtless result in arguments over whether Oracle's implementation of Linux APIs in Solaris 10 was a violation of copyright or not (and presumably Google are c
mjg59 | Implementing UEFI Boot to Zork
One of the earlier examples of students using MIT computer resources to lay the groundwork for a later commercial endeavour, Zork was originally written in a LISP derivative called MDL. This was later tuned into the Zork Implementation Language, a domain specific language that was compiled to target the Z-machine rather than a specific piece of hardware. Combined with machine-specific Z-machine in
mjg59 | Making timeouts work with suspend
A reasonably common design for applications that want to run code at a specific time is something like: time_t wakeup_time = get_next_event_time(); time_t now = time(NULL); sleep(wakeup_time-now); This works absolutely fine, except that sleep() ignores time spent with a suspended system. If you sleep(3600) and then immediately suspend for 45 minutes you'll wake up after 105 minutes, not 60. Which
mjg59 | Properly booting a Mac
This is mostly for my own reference, but since it might be useful to others: By "Properly booting" I mean "Integrating into the boot system as well as Mac OS X does". The device should be visible from the boot picker menu and should be selectable as a startup disk. For this to happen the boot should be in HFS+ format and have the following files:/mach_kernel (can be empty)/System/Library/CoreServi
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mjg59 | Real-world Secure Boot attacks