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http://wyoos.org
IDT interupt descriptor table
GDT global descriptor table
- set up segments
- code segments, RX, never W
- data segments, RW, never X
- 16-bit compatibility on Intel, so quite a nightmare
- asm( LGDT ) needed
=> we do GTD all in assembly, not really readable! Ideal would be to
do as much as possible in C/C++ (even with some zero-overhead
C++17 crazyness maybe) and then call a pure assembly function with
a pointer to the GTD doing the 'LGDT' assembly operation
types:
- have local typedefs for DWORD32 or uint32_t (as Windows and POSIX did
it)
keyboard:
- 0x20 PIC
- asm( outb( port, byte)), outb function => better have ports knowing
their own bandwith.
SlowPort8, slowing down assembly code
interrupts:
- assember stubs translating calling conventions to static C++ function
handling the interrupt number NO
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