7ad37df02c
If the user has asked for the vertical height registers to be recomputed by setting bit 15 in the video mode number, we do so without clearing the Protect bit in the Vertical Retrace Register before setting the Overflow register. As a result, if the VGA BIOS had set the Protect bit, the write to the Overflow register will be dropped, and bits [9:8] of the vertical height will be left unchanged. This is a bug imported from the assembly version of this code. It was pointed out by Etienne Lorrain. Cc: Etienne Lorrain <etienne_lorrain@yahoo.fr> Signed-off-by: H. Peter Anvin <hpa@zytor.com> |
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| .. | ||
| compressed | ||
| tools | ||
| .gitignore | ||
| Makefile | ||
| a20.c | ||
| apm.c | ||
| bitops.h | ||
| boot.h | ||
| cmdline.c | ||
| code16gcc.h | ||
| copy.S | ||
| cpu.c | ||
| cpucheck.c | ||
| edd.c | ||
| header.S | ||
| install.sh | ||
| main.c | ||
| mca.c | ||
| memory.c | ||
| mtools.conf.in | ||
| pm.c | ||
| pmjump.S | ||
| printf.c | ||
| setup.ld | ||
| string.c | ||
| tty.c | ||
| version.c | ||
| vesa.h | ||
| video-bios.c | ||
| video-vesa.c | ||
| video-vga.c | ||
| video.c | ||
| video.h | ||
| voyager.c | ||