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Flushing TLBs is required to ensure cache coherency according to the AMD64 architecture manual. Flushing caches is only required when changing from a cacheable memory type (WB, WP, or WT) to an uncacheable type (WC, UC, or UC-). Since this function is only used once per processor during startup, there is no need to take any shortcuts. - Leave PAT indices 0-3 at the default of WB, WT, UC-, and UC. Program 5 as WP (from default WT) and 6 as WC (from default UC-). Leave 4 and 7 at the default of WB and UC. This is to avoid transition from a cacheable memory type to an uncacheable type to minimize possible cache incoherency. Since we perform flushing caches and TLBs now, this change may not be necessary any more but we do not want to take any chances. - Remove Apple hardware specific quirks. With the above changes, it seems this hack is no longer needed. - Improve pmap_cache_bits() with an array to map PAT memory type to index. This array is initialized early from pmap_init_pat(), so that we do not need to handle special cases in the function any more. Now this function is identical on both amd64 and i386. Reviewed by: jhb Tested by: RM (reuf_m at hotmail dot com) Ryszard Czekaj (rychoo at freeshell dot net) army.of.root (army dot of dot root at googlemail dot com) MFC after: 3 days
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``world'' target should only be used in cases where the source tree has not changed from the currently running version. See: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html