emu: modrm displacement, LEA instruction

src/emu/operations.rs

@@ -1,7 +1,7 @@
 use emu::byteorder::{ByteOrder, LittleEndian};
 use emu::dos;
 use emu::i8088::i8088;
-use emu::operands::{Address, LValue, Reg, RValue};
+use emu::operands::{Addr, Address, LValue, Reg, RValue};
 use emu::pc::Bus;
 use emu::util::segoff_to_addr;
 
@@ -26,6 +26,10 @@ pub fn int(cpu: &mut i8088, bus: &mut Bus, num: &u8) {
   }
 }
 
+pub fn lea(dst: &mut Reg, addr: &Addr) {
+  dst.write(addr.offset)
+}
+
 pub fn mov<T>(dst: &mut impl LValue<T>, src: &impl RValue<T>) {
   dst.write(src.read());
 }