Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 641

PAL_FREQ_RATIOS – Get Processor Frequency Ratios (14)
Returns the ratios of the processor frequency, bus frequency, and interval timer to the
Purpose:
input clock of the processor, if the platform clock is generated externally or to the
output clock to the platform, if the platform clock is generated by the processor.
Static Registers Only
Calling Conv:
Physical or Virtual
Mode:
Not dependent
Buffer:
Arguments:
Argument
index
Reserved
Reserved
Reserved
Returns:
Return Value
status
proc_ratio
bus_ratio
itc_ratio
Status:
Status Value
0
-2
-3
Each of the ratios returned is an unsigned 64-bit value, where the upper unsigned 32
Description:
bits contain the numerator and the lower unsigned 32 bits contain the denominator of
the ratio, as depicted in
the denominator.
Figure 11-12. Return values
31
63
• denominator – Unsigned 32-bit integer
• numerator – Unsigned 32-bit integer
Volume 2, Part 1: Processor Abstraction Layer
Description
Index of PAL_FREQ_RATIOS within the list of PAL procedures.
0
0
0
Description
Return status of the PAL_FREQ_RATIOS procedure.
Ratio of the processor frequency to the input clock of the processor, if the platform clock is
generated externally or to the output clock to the platform, if the platform clock is generated
by the processor.
Ratio of the bus frequency to the input clock of the processor, if the platform clock is
generated externally or to the output clock to the platform, if the platform clock is generated
by the processor.
Ratio of the interval timer counter rate to input clock of the processor, if the platform clock is
generated externally or to the output clock to the platform, if the platform clock is generated
by the processor.
Description
Call completed without error
Invalid argument
Can not complete call without error
Figure 11-12. Each ratio is given by dividing the numerator by
denominator
numerator
PAL_FREQ_RATIOS
0
32
2:393