- 论坛徽章:
- 2
|
- LOCK - Lock Bus
- Usage: LOCK
- LOCK: (386+ prefix)
- Modifies flags: None
- This instruction is a prefix that causes the CPU assert bus lock
- signal during the execution of the next instruction. Used to
- avoid two processors from updating the same data location. The
- 286 always asserts lock during an XCHG with memory operands. This
- should only be used to lock the bus prior to XCHG, MOV, IN and
- OUT instructions.
- Clocks Size
- Operands 808x 286 386 486 Bytes
- none 2 0 0 1 1
- F0 LOCK Asserts LOCK# signal
复制代码 |
|