site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com User-agent: Thunderbird 1.5.0.8 (Macintosh/20061025) = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... Andrew Gallatin wrote: What is the address space layout of 64-bit applications on x86_64? Is the address space below 4GB reserved for kernel mappings? It's my recollection that, on EM64T systems the 64-bit user process memory map leaves the virtual range 0-0xffffffff unmapped as a mechanism for catching application (and originally kernel) bugs. This email sent to site_archiver@lists.apple.com