Hardware Configuration Register (Hwcr); New Instructions - AMD K5 Technical Reference Manual

AMD-K5 Processor Technical Reference Manual
3.2.5

Hardware Configuration Register (HWCR)

3.3

New Instructions

3-28
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.
In addition to supporting all of the 486 processor instructions,
the AMD-K5 processor implements the following instructions:
CPUID
CMPXCHG8B
MOV to and from CR4
RDTSC
RDMSR
WRMSR
RSM
Illegal instruction (reserved opcode)
18524C/0—Nov1996
Software Environment and Extensions