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Plain old VGA text mode functionality was introduced in 1987, and is obviously still used on some (even modern) x86 machines. However, it's very limited in what it gives to us, because by using a 80x25 text mode console, it's guaranteed that no desktop functionality is available during such OS runtime session. It's also quite complicated to handle access arbitration on the VGA ISA ports which means that only one VGA card can work in VGA mode, which makes it very cumbersome to manage multiple cards at once. Since we never relied on the VGA text mode console for anything serious, as booting on a QEMU machine always gives a proper framebuffer to work with, VGA text mode console was used in bare metal sessions due to lack of drivers. However, since we "force" multiboot-compatible bootloaders to provide us a framebuffer, it's basically a non-issue to have a functional console on bare metal machines even if we don't have the required drivers. |
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| .. | ||
| API | ||
| Arch | ||
| Boot | ||
| Bus | ||
| Devices | ||
| FileSystem | ||
| Firmware/ACPI | ||
| Heap | ||
| Interrupts | ||
| Library | ||
| Locking | ||
| Memory | ||
| Net | ||
| Prekernel | ||
| Security | ||
| Syscalls | ||
| Tasks | ||
| Time | ||
| CMakeLists.txt | ||
| Debug.h.in | ||
| embedmap.sh | ||
| Forward.h | ||
| generate-version-file.sh | ||
| kprintf.cpp | ||
| kstdio.h | ||
| KSyms.cpp | ||
| KSyms.h | ||
| mkmap.sh | ||
| SanCov.cpp | ||
| Sections.h | ||
| UnixTypes.h | ||