On 03.02.2014 12:57, Colin Watson wrote: > movw $(GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR + 0x17), %bx > andb $3, (%bx) andb $3, (%bx) is equivalent to C code: *(grub_uint8_t *)bx &= 3; andb modifies the value at (%bx). You probably meant to use testb which has same flag semantics but doesn't change operands
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