AMD AMD5K86 - New Instructions

AMD~
AMD5J!36 Processor Technical Reference Manual
18524B/O-Mar1996
3.2.5
H __ rdware Configuration Register (HWCR)
The Hardware Configuration Register (HWCR) contains con-
figuration bits that control miscellaneous debugging functions.
The HWCR can be written or read with the WRMSR or
RDMSR instruction when the ECX register contains the value
83h.
For details on the HWCR, see Section 7.1 on page 7-3.
3.3 New Instructions
3-28
In addition to supporting all of the 486 processor instructions,
the AMDS
K
86 processor implements the following instructions:
• CPUID
•
CMPXCHG8B
• MOV to and from CR4
• RDTSC
• RDMSR
• WRMSR
• RSM
•
Illegal instruction (reserved opcode)
Software Environment and Extensions