I just checked the AMD K6-2 Processor Data Sheet. It states the following
bits in CR4 being used:
0 - VME (Virtual-8086 Mode Extensions)
1 - PVI (Protected Virtual Interrupts)
2 - TSD (Time Stamp Disable)
3 - DE (Debugging Extensions)
4 - PSE (Page Size Extensions)
5 - reserved
6 - MCE (Machine Check Enable)
7 - reserved
...
31 - reserved
Then there is the Extended Feature Enable Register (EFER, ECX=0xc0000080):
0 - SCE (System Call Extension)
1 - DPE (Data Prefetch Enable)
2/3 - EWBEC (EWBE Control)
4 - reserved
...
63 - reserved
And also the Processor State Observability Register (PSOR, ECX=0xc0000087):
0-2 - BF (Bus Frequency divisor) -> THERE ARE K6-2 with 66MHz FRONTSIDE BUS!
3 - reserved
4-7 - STEP (Processor Stepping)
8 - NOL2 (No L2 Functionality)
9 - reserved
...
63 - reserved
But no bit 10 in CR4...
Yours,
Dominik Kubla
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