发明名称 |
Microcode patch device and method for patching microcode using match registers and patch routines |
摘要 |
Random access memory (RAM) may be provided in a processor for implementing microcode patches. The patch RAM may loaded by a microcode routine that is part of the normal microcode contained in a microcode read only memory (ROM) unit of the processor. When the processor powers-up, it uses its internal ROM microcode only if no patches are installed. If patches are installed and a microcode line is accessed for which a patch is enabled, the patch is executed instead of the microcode line. A patch may be enabled by setting a match register with the address of the microcode instruction line in the microcode ROM that is to be patched. Whenever the microcode ROM address matches the contents of a match register, control is transferred to the patch RAM. The patch RAM may have a plurality of fixed entry points each corresponding to a different match register.
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申请公布号 |
US6438664(B1) |
申请公布日期 |
2002.08.20 |
申请号 |
US19990428635 |
申请日期 |
1999.10.27 |
申请人 |
ADVANCED MICRO DEVICES, INC. |
发明人 |
MCGRATH KEVIN J.;PICKETT JAMES K. |
分类号 |
G06F9/24;(IPC1-7):G06F9/00;G06F12/00;G06F13/00 |
主分类号 |
G06F9/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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