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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Move the generic function and variable definitions from vgabios.h to a
new file vgautil.h. This reduces the size and complexity of
vgabios.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The software cursor code is not frequently used (only the coreboot
framebuffer vga code uses it). Move its logic out of the main code
and into swcursor.c.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Introduce a new function vgafb_scroll() to scroll a window on the
screen and update vgabios.c to use only that function for scrolling.
This makes the low-level vgafb_move_chars() and vgafb_clear_chars()
local to vgafb.c, and it simplifies the callers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The original "lgpl vgabios" internally used page=0xff as a mechanism
for specifying the current page. It also would allow int1013 calls to
externally specify bh==0xff for the current page. However, there is
no documentation supporting this as an externally available feature.
SeaVGABIOS does not need the internal shortcut; this patch removes the
code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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When emulating text mode on "coreboot framebuffer" SeaVGABIOS, return
a foreground and background attribute from gfx_read_char() and prefer
returning a space character (instead of null) on blank cells.
This also returns the foreground color (instead of always returning
zero) for regular graphics mode gfx_read_char() calls. This seems
fine as tests show other vgabios implementations also return various
values here.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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GWBasic relies on this, so implement it to enable some serious retrocomputing.
There is no better way to do it than trying to match all characters one by one
against the current font.
This makes it possible to actually do something in SCREEN 1 and SCREEN 2
(without it, you can use graphics in the programs but not in direct mode).
I couldn't find documentation for what to return as the attribute, but
experimenting with DOSBox suggests 0 (and GWBasic accepts it).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add mechanism for drawing a cursor to the framebuffer to implement a
cursor in software. The timer interrupt is "hooked" so that the
cursor can blink. This can be useful for "coreboot native vga".
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add support for simple text mode attribute emulation while in graphics
mode. This improves text highlighting and background color on some
boot-loaders. Enable it only for CBVGA vgabios and only when a text
mode is requested.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Support reading high memory "direct" framebuffers and translating the
results to 8 bit attribute values.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Now that a pointer to the current video mode info struct is cached in
memory, it's not necessary to pass the struct into the vgafb code.
The vgafb code can lookup the struct itself.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add code for manipulating "direct" style linear RGB framebuffers that
may be in high memory.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Factor out code that calculates the text mode address of a given
character.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The vgabios graphics manipulations can all be implemented on top of 4
basic primitives: read 8 pixels, write 8 pixels, move pixels, and
clear pixels. Implement these four operators for all the graphics
modes and rewrite the graphics functions in vgafb.c to use them. This
simplifies the graphics code as the high level logic no longer needs
to be implemented for each graphical framebuffer type.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Rewrite the low-level scroll code so that it is implemented using two
basic operations: move text and clear text. This simplifies the
low-level code as it no longer needs to handle up scrolling vs down
scrolling. Determining the direction of the scroll is now done in the
higher level (vgabios.c) code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add option CONFIG_VGA_STDVGA_PORTS. When this option is disabled, the
main BIOS code will not attempt to access any of the legacy VGA IO
ports.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Obtain the font data from int 0x43 and int 0x1f, and obtain the font
height from the BDA. This enables application overrides for the font
data.
This patch also unifies the variable naming between the
planar/CGA/linear character writing functions and uses the same names
that the screen scrolling functions use.
This patch also optimizes the inner loop of the CGA font writing to
reduce overall stack usage.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Also, sort the order of include files in the c files.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Unify the syntax for byte swab calls.
This also fixes a bug in coreboot due to the lack of a be64_to_cpu()
call.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Don't bother programming the vga registers to manipulate the
framebuffer when in planar4 mode. Instead, just switch between the
four planes and do the manipulation with regular reads and writes.
This makes the code simpler to understand (the vga hardware
manipulations are arcane and complex).
Note, this could make text scrolling in planar4 mode slower and more
likely to result in tearing. However, it's unlikely anything
important uses the vgabios in planar4 mode.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Extract out the fields in 'struct vgamode_s' that are used in the main
code. The remaining fields are specific to the standard vga hardware
driver.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The previous code could obtain the page size in different ways - from
vmode_g->sslength, from SCREEN_MEM_START, or by manually multiplying
cols and rows. Add a new func (calc_page_size) and use that in areas
that need to calculate the page size.
Convert readers of the page size to read it from the "video_pagesize"
entry in the BDA instead of recalculating it.
Remove the page size from struct vgamode_s (slength) as it is now
calculated dynamically. The new calculated versions are different
from the existing values exported in video_param_table. However, the
existing values (for CGA) did not look correct - I compared the values
to those exported by two other VGA BIOS manufacturers and used the
values that look more standard.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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For graphics modes, store pixel width/height instead of text
width/height. Add explicit char width field. Where needed, calculate
text width/height from pixel width/height by dividing pixel count by
character size.
Rename some fields and change field sizes to match cirrus/bochs
definitions.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Replace the custom flags with the flags defined in the VBE spec.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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All three scroll function variants have the same format, but those
that have an implicit character width or height of 1 have those
multiplications omitted. Add those multiplications back in (the
compiler will optimize them away) so all the variants look similar.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Fix missing divide by 2 in CGA mode scroll. Consistently use
cheight/2 for all uses.
Planar graphics character write has a read to video memory with a side
effect - mark that as volatile so the compiler doesn't optimize it
away.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Split out the BDA setup part of vga_set_mode to new function
modeswitch_set_bda. Move the remaining parts (palette loading, screen
clearing, font loading) of vga_set_mode into stdvga_set_mode.
Add new mode switching flags and pass them to stdvga_set_mode, so it
does not need to inspect modeset_ctl directly.
Move code needed by stdvga_set_mode (perform_gray_scale_summing,
clear_screen) to stdvga.c.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Also, introduce stdvga.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Also, rename vgatables.h to vgabios.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Now that all the info in video_param_table is also in vgamode_s, use
the info in vgamode_s throughout the code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Implement wrapper calls in vgaio.c and use them instead.
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Remove remaining "biosfn_" prefixes from functions.
Don't use register names as function parameters.
vgafb_read_pixel should return a value (instead of passing in a pointer)
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Introduce memcpy_stride and memset_stride functions.
Simplify the moves and fills using src and dest pointers.
Don't nest for loops - just use one loop for copies.
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Check for nblines==0 in calling function.
Eliminate full screen clearing optimization.
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Use vmode_g->memmodel instead of memmodel and svgamode.
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Rename biosfn_scroll to vgafb_scroll.
Break function up into per-mode scroll function.
Pass row/col params in a 'struct cursorpos'.
Encode direction as sign in nblines.
Move parameter checking to callers.
Add enhancement to 'attr' for using mode specific default attribute.
Also, make get_cursor_pos local to vga.c.
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