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bootloader: Check that VESA mode is linear

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I don't think there are any graphical non-linear framebuffers but good
to be sure
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Bananymous
2026-07-08 23:20:58 +03:00
parent 9bdf60bb88
commit 658e74b507
1 changed files with 5 additions and 3 deletions
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8
bootloader/bios/framebuffer.S
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@@ -108,9 +108,11 @@ vesa_find_video_mode:
cmpb $0x4F, %al; jne .vesa_unsupported
cmpb $0x00, %ah; jne .vesa_error
# check whether in graphics mode
testb $0x10, (vesa_mode_info_buffer + 0)
jz .vesa_find_video_mode_next_mode
# check whether in graphics mode and linear framebuffer
movb (vesa_mode_info_buffer + 0), %al
andb $(0x80 | 0x10), %al
cmpb $(0x80 | 0x10), %al
jne .vesa_find_video_mode_next_mode
# compare mode's dimensions
movw -2(%ebp), %ax; cmpw %ax, (vesa_mode_info_buffer + 0x12)