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* [mubios] Complete VGA text initialization and add VBE graphics servicesRichard Qin18 hours1-0/+60
Load the 8x16 font and VGA palette, restore text memory mapping, and synchronize BIOS cursor and page state with the hardware. Allocate QEMU standard VGA PCI memory resources and expose VBE controller information, mode queries and switching, logical scanline lengths, and display start control. Signed-off-by: Richard Qin <richard.qin.x@gmail.com>