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diff --git a/manual/platform.texi b/manual/platform.texi new file mode 100644 index 0000000000..02b5c554ab --- /dev/null +++ b/manual/platform.texi @@ -0,0 +1,28 @@ +@node Platform, Contributors, Maintenance, Top +@c %MENU% Describe all platform-specific facilities provided +@appendix Platform-specific facilities + +@Theglibc{} can provide machine-specific functionality. + +@menu +* PowerPC:: Facilities Specific to the PowerPC Architecture +@end menu + +@node PowerPC +@appendixsec PowerPC-specific Facilities + +Facilities specific to PowerPC that are not specific to a particular +operating system are declared in @file{sys/platform/ppc.h}. + +@deftypefun {uint64_t} __ppc_get_timebase (void) +Read the current value of the Time Base Register. + +The @dfn{Time Base Register} is a 64-bit register that stores a monotonically +incremented value updated at a system-dependent frequency that may be +different from the processor frequency. More information is available in +@cite{Power ISA 2.06b - Book II - Section 5.2}. + +@code{__ppc_get_timebase} uses the processor's time base facility directly +without requiring assistance from the operating system, so it is very +efficient. +@end deftypefun |