108 /* * Floating point unit registers (fsave instruction). * The s87_ac[] and fx_87_ac[] are relative to the stack top. * The 'tag word' contains 2 bits per register and refers to absolute register * numbers. * The cpu sets the tag values 0b01 (zero) and 0b10 (special) when a value * is loaded. The software need only set 0b00 (used) and 0xb11 (unused). * The fxsave 'Abridged tag word' in inverted. */