coreboot-kgpe-d16/payloads/libpayload
Duncan Laurie 98409cff92 libpayload: corebootfb: Add null check for framebuffer address
If the framebuffer address is zero the corebootfb_init() function
should abort and not attempt to use it for video, otherwise it
will likely hang.

This was tested by booting on a board that does not have a display
attached and includes the previous patch to zero the framebuffer
structure in the coreboot tables.

Change-Id: I53ca2e947a7915cebb31b51e11ac6c310d9d6c55
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/20368
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2017-06-27 02:16:10 +00:00
..
arch payloads: change coreboot to lowercase 2017-06-07 12:08:55 +02:00
bin libpayload: Move base address, stack and heap size to Kconfig 2016-03-15 20:53:38 +01:00
configs libpayload/configs: Add configuration for Galileo 2017-06-26 15:32:17 +00:00
crypto libpayload: Make Kconfig bools use IS_ENABLED() 2015-06-30 18:55:15 +02:00
curses libpayload/.../PDCurses: Improve compatibility with ncurses 2016-12-14 18:02:51 +01:00
drivers libpayload: corebootfb: Add null check for framebuffer address 2017-06-27 02:16:10 +00:00
gdb libpayload/gdb: fix unused variable warning 2017-04-29 07:34:08 +02:00
include detachables: Add invert parameter 2017-05-25 18:23:56 +02:00
libc payloads: change coreboot to lowercase 2017-06-07 12:08:55 +02:00
libcbfs libpayload: cbfs: Fix minor memory leak in some edge cases 2016-08-12 22:52:22 +02:00
liblz4 cbfs: Add LZ4 in-place decompression support for pre-RAM stages 2016-02-22 21:38:37 +01:00
liblzma libpayload: lzma: Allocate scratchpad on the heap 2016-08-08 19:02:07 +02:00
libpci Remove empty lines at end of file 2015-06-08 00:55:07 +02:00
sample Remove empty lines at end of file 2015-06-08 00:55:07 +02:00
tests Remove empty lines at end of file 2015-06-08 00:55:07 +02:00
Doxyfile
Kconfig libpayload: Enable building libpayload with march=i586 2017-06-26 23:14:05 +00:00
LICENSES libpayload: Add LZ4 decompression algorithm 2015-07-09 00:10:16 +02:00
LICENSE_GPL libpayload: Introduce new Kconfig to explicitly allow GPL code 2015-01-09 07:06:27 +01:00
Makefile libpayload: fix build 2017-01-25 17:58:48 +01:00
Makefile.inc libpayload: update junit.xml target, clean up output 2016-03-25 18:18:27 +01:00
README Use www.coreboot.org over coreboot.org 2017-06-07 12:05:44 +02:00

README

-------------------------------------------------------------------------------
libpayload README
-------------------------------------------------------------------------------

libpayload is a minimal library to support standalone payloads
that can be booted with firmware like coreboot. It handles the setup
code, and provides common C library symbols such as malloc() and printf().

Note: This is _not_ a standard library for use with an operating system,
rather it's only useful for coreboot payload development!
See https://www.coreboot.org for details on coreboot.


Installation
------------

 $ git clone https://review.coreboot.org/p/coreboot.git

 $ cd coreboot/payloads/libpayload

 $ make menuconfig

 $ make

 $ sudo make install (optional, will install into /opt per default)

As libpayload is for 32bit x86 systems only, you might have to install the
32bit libgcc version, otherwise your payloads will fail to compile.
On Debian systems you'd do 'apt-get install gcc-multilib' for example.


Usage
-----

Here's an example of a very simple payload (hello.c) and how to build it:

 #include <libpayload.h>

 int main(void)
 {
     printf("Hello, world!\n");
     return 0;
 }

Building the payload using the 'lpgcc' compiler wrapper:

 $ lpgcc -o hello.elf hello.c

Please see the sample/ directory for details.


Website and Mailing List
------------------------

The main website is https://www.coreboot.org/Libpayload.

For additional information, patches, and discussions, please join the
coreboot mailing list at https://www.coreboot.org/Mailinglist, where most
libpayload developers are subscribed.


Copyright and License
---------------------

See LICENSES.