jlxip
commented
5 years ago You probably aren't using the volatile tag in the inline assembler. volatile tells the compiler explicitly not to remove or reorder the instructions.
Open thehuzaifashaikh opened 5 years ago
jlxip
commented
5 years ago You probably aren't using the volatile tag in the inline assembler. volatile tells the compiler explicitly not to remove or reorder the instructions.
To load the Global Descriptor Table, the instruction “lgdt” when called from C code, gets discarded, and results in an error “Invalid asm operand: invalid expression”. This is only valid if the compiler is run in a level 2 optimised mode. If it’s not optimized, the compiler runs without any problem.