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sgabios outputs incorrect video modes
When run with a bootstrap loader that uses int 0x10 with 0x1301 in %ax, incorrect video modes are output to the serial port. I believe the VGA image will be correct. This might also affect the returned values for some interrupts.
This is caused because the set_cursor_position routine fails to save and restore %bx.
I'm working on a fix for this.
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