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Alpha 21264/EV67 Hardware Reference Manual
Internal Processor Registers 5–23
Ibox IPRs
5.2.22 Performance Counter Control Register – PCTR_CTL
The performance counter control register (PCTR_CTL) is a read-write register that
controls the function of the performance counters for either aggregate counting or Pro-
fileMe sampling counting.
Usage of PCTR_CTL in performance monitoring is described in Section 6.10.
Figure 5–25 shows the performance counter control register.
Figure 5–25 Performance Counter Control Register
FPE [2] RW,1 Floating-point enable—if clear, floating-point instructions
generate FEN exceptions. This bit is set by hardware on
reset.
PPCE [1] RW Process performance counting enable.
Enables performance counting for an individual process
with counters PCTR0 or PCTR1, which are enabled by set-
ting PCT0_EN or PCT1_EN, respectively.
Performance counting for the entire system can be enabled
by setting I_CTL[SPCE]. See Section 5.2.15 for more infor-
mation.
See Section 6.10 for information about performance count-
ing.
Reserved [0] — —
Table 5–14 Process Context Register Fields Description (Continued)
Name Extent Type Description
63 48 2847 2726 625 543210
SEXT(PCTR0_CTL[47])
PCTR0[19:0]
PM_STALLED
PM_KILLED_BM
PCTR1[19:0]
SL0
SL1[1:0]
VAL
TAK
LK
99
-
003
4A