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As per commit f775e740a3a817a4ff5ba26bea99dbfd735456b3, inreg parameters
of intcall() shall be zeroified.
Having unclean inreg could trigger bad behaviors on some hosts.
This patch is about adding memset() calls prior any intcall() :
- some intcall didn't had any memset at all
- some successive intcall() calls didn't memset inreg in between calls
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Use the one from syslinux/video.h. This makes it easier to write unit
tests for syslinux/load_linux.c without pulling in loads of core
definitions from core/include/graphics.h. It can also be argued that
syslinux_* symbols should have prototypes in syslinux/*.h files.
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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Before modules were dynamically loaded the boundary between GPL and
non-GPL code was implicit because of the separate link domains for
each module. With dynamic modules we need an explicit whitelist of
core symbols that non-GPL code can link against at runtime without
needing to be re-licensed under the GPL.
Mark such symbols with __export, so that it is explicitly clear which
symbols in the core can be linked against by non-GPL code.
Reduce the visibility of symbols in both the core and ldlinux.c32 with
-fvisibility=hidden. __export changes the visibility to 'default'.
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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The syslinux_force_text_mode() function used in library
space made unnecessary INT 0x22 call that could be simply
used with vgaclearmode() function.
This patche renames vgaclearmode() to
syslinux_force_text_mode() as this naming is generally more
carefully considered and gets rid of "forcetext.c" source
file.
Also all the VGA-related functions and variables that were
exported in core/include/bios.h have been moved out to
core/include/graphics.h which makes more sense actually.
Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
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There is an awful lot of code currently implemented in assembly when
it could just as easily be implemented in C. Having it in C makes it
much easier to share code between the BIOS and forthcoming EFI
firmware backend. The following code fragments have been rewritten,
- timer initialisation
- adjust_screen()
- check_esapes() and mem_init()
- conio.inc
- plaincon.inc
- cleanup.inc
- serirq.inc
- font.inc
- graphics
- writehex
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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