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boot/bios_ia32: check that the vga mode was successfully set 

before trying to write to the frame buffer.
* QEMU can now be started without a standard vga output (-vga none).

Change-Id: Id46cd4d70ce16e2156e0b0668fb88f09112067a0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7667
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
This commit is contained in:
Jérôme Duval 2024-05-04 17:19:09 +02:00 committed by Adrien Destugues
parent 205b8694e5
commit baa67e1184
1 changed files with 7 additions and 3 deletions
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10
src/system/boot/platform/bios_ia32/video.cpp
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@ -708,13 +708,14 @@ video_mode_menu()
}
static void
static status_t
set_vga_mode(void)
{
// sets 640x480 16 colors graphics mode
bios_regs regs;
regs.eax = 0x0012;
call_bios(0x10, &regs);
return (regs.eax == 0x4f) ? B_OK : B_NOT_SUPPORTED;
}
@ -872,8 +873,11 @@ platform_switch_to_logo(void)
gKernelArgs.frame_buffer.physical_buffer.start = modeInfo.physical_base;
} else {
fallback:
// use standard VGA mode 640x480x4
set_vga_mode();
// try to use standard VGA mode 640x480x4
if (set_vga_mode() != B_OK) {
dprintf("no standard VGA output\n");
return;
}
gKernelArgs.frame_buffer.width = 640;
gKernelArgs.frame_buffer.height = 480;