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6d94f83301
This patch fixes the remaining few bugs in our shiny new cache iteration by set/way/level algorithm to actually make it work: It makes it start from cache level 0 (previously it would always start at LoC and be "done" instantly), fixes up the two shifts that isolate the set bits at the end (which didn't seem to account for the fact that the first shift affects the second), and throws an S bit on that last shift so that it actually affects the conditionals after it. In addition, also moves the next_level block to the top so that we can share (and thus eliminate) some code at initialization, and turns the whole thing into a thrice-instantiated macro to create functions that fit our existing interface. BUG=None TEST=Ran with cache_test code (see separate CL) and closely examined the resulting output. Made sure results look as expected (iterating through all sets (inner) and ways (outer) for L1 and then L2 cache, extracting the right numbers from CLIDR and CCSIDR, not touching anything twice). Time for a single dcache_clean_invalidate_all() on Nyan drops from 3.7ms to 0.3ms. Change-Id: I1338a589cbb37d74ea6e7a3d4f67ff827e24edbe Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/183879 Reviewed-by: Stefan Reinauer <reinauer@google.com> Reviewed-by: David Hendricks <dhendrix@chromium.org> |
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| README | ||
------------------------------------------------------------------------------- coreboot README ------------------------------------------------------------------------------- coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. coreboot was formerly known as LinuxBIOS. Payloads -------- After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot. See http://www.coreboot.org/Payloads for a list of supported payloads. Supported Hardware ------------------ coreboot supports a wide range of chipsets, devices, and mainboards. For details please consult: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://www.coreboot.org/Build_HOWTO for details. Testing coreboot Without Modifying Your Hardware ------------------------------------------------ If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU. Please see http://www.coreboot.org/QEMU for details. Website and Mailing List ------------------------ Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://www.coreboot.org/Mailinglist Copyright and License --------------------- The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details. coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details. This makes the resulting coreboot images licensed under the GPL, version 2.