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E–6 Alpha Architecture Handbook
Windows NT Alpha
Input: a0 = 0 Select counter 0
a0 = 1 Select counter 1
a1 = 0 Disable selected counter
Select desired events (mux_ctl)
DIGITAL UNIX
Input: a0 = 2 Function code
a1 = mux_ctl mux_ctl is the exact contents of those fields
from the ICCSR register, in write format,
described in Table E–2.
Output: v0 = 1 Success
v0 = 0 Failure (not generated)
OpenVMS Alpha
Input: R16 = 2 Function code
R17 = mux_ctl mux_ctl is the exact contents of those fields
from the ICCSR register, in write format,
described in Table E–2.
Output: R0 = 1 Success
R0 = 0 Failure (not generated)
Windows NT Alpha
Input: a2 = PCMUX0 For ICCSR<PCMUX0> field when a0 = 0
a2 = PCMUX1 For ICCSR<PCMUX1> field when a0 = 1
a3 = PC0 For ICCSR<PC0> field when a0 = 0
a3 = PC1 For ICCSR<PC1> field when a0 = 1
Select performance monitoring options
DIGITAL UNIX
Input: a0 = 3 Function code
a1 = opt Function argument opt is:
<0> = log all processes if set
<1> = log only selected if set
Output: v0 = 1 Success
v0 = 0 Failure (not generated)
Table E–1: DECchip 21064/21066/21068 Performance Monitoring Functions
(Continued)
Function Register Usage Comments