From 8ad11b9a9cf1de82bd7771306b42070b91417c11 Mon Sep 17 00:00:00 2001 From: Tulio Magno Quites Machado Filho Date: Tue, 25 Sep 2012 14:48:28 -0500 Subject: Add __ppc_get_timebase_freq to ppc.h. --- ChangeLog | 20 +++++++ manual/platform.texi | 8 +++ sysdeps/powerpc/sys/platform/ppc.h | 1 + sysdeps/unix/sysv/linux/powerpc/Makefile | 6 +++ sysdeps/unix/sysv/linux/powerpc/bits/ppc.h | 33 ++++++++++++ .../unix/sysv/linux/powerpc/get_timebase_freq.c | 26 +++++++++ sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions | 3 ++ .../linux/powerpc/powerpc32/fpu/nptl/libc.abilist | 1 + sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions | 3 ++ .../sysv/linux/powerpc/powerpc64/nptl/libc.abilist | 1 + .../unix/sysv/linux/powerpc/test-gettimebasefreq.c | 62 ++++++++++++++++++++++ 11 files changed, 164 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/powerpc/bits/ppc.h create mode 100644 sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c create mode 100644 sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c diff --git a/ChangeLog b/ChangeLog index 1fff9ba..5acd55b 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,23 @@ +2012-09-25 Tulio Magno Quites Machado Filho + + * manual/platform.texi (PowerPC): Document __ppc_get_timebase_freq. + * sysdeps/powerpc/sys/platform/ppc.h: Include the operating + system header. + * sysdeps/unix/sysv/linux/powerpc/Makefile (sysdep_headers): + Likewise. + (sydep_routines): Add the new and the internal functions. + * sysdeps/unix/sysv/linux/powerpc/bits/ppc.h: New file. + * sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c: Likewise. + * sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions + (GLIBC_2.17): Add the new function. + * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist + (GLIBC_2.17): Likewise. + * sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions + (GLIBC_2.17): Likewise. + * sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist + (GLIBC_2.17): Likewise. + * sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c: New file. + 2012-09-25 Alan Modra * sysdeps/unix/sysv/linux/powerpc/pthread_once.c (__pthread_once): diff --git a/manual/platform.texi b/manual/platform.texi index 02b5c55..e387ff4 100644 --- a/manual/platform.texi +++ b/manual/platform.texi @@ -26,3 +26,11 @@ different from the processor frequency. More information is available in without requiring assistance from the operating system, so it is very efficient. @end deftypefun + +@deftypefun {uint64_t} __ppc_get_timebase_freq (void) +Read the current frequency at which the Time Base Register is updated. + +This frequency is not related to the processor clock or the bus clock. +It is also possible that this frequency is not constant. More information is +available in @cite{Power ISA 2.06b - Book II - Section 5.2}. +@end deftypefun diff --git a/sysdeps/powerpc/sys/platform/ppc.h b/sysdeps/powerpc/sys/platform/ppc.h index 165652c..3780f57 100644 --- a/sysdeps/powerpc/sys/platform/ppc.h +++ b/sysdeps/powerpc/sys/platform/ppc.h @@ -20,6 +20,7 @@ #define _SYS_PLATFORM_PPC_H 1 #include +#include /* Read the Time Base Register. */ static inline uint64_t diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile index f6dccd9..6bdf4dc 100644 --- a/sysdeps/unix/sysv/linux/powerpc/Makefile +++ b/sysdeps/unix/sysv/linux/powerpc/Makefile @@ -16,3 +16,9 @@ endif ifeq ($(subdir),elf) sysdep_routines += dl-vdso endif + +ifeq ($(subdir),misc) +sysdep_headers += bits/ppc.h +sysdep_routines += get_clockfreq get_timebase_freq +tests += test-gettimebasefreq +endif diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/ppc.h b/sysdeps/unix/sysv/linux/powerpc/bits/ppc.h new file mode 100644 index 0000000..76542d9 --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/bits/ppc.h @@ -0,0 +1,33 @@ +/* Facilities specific to the PowerPC architecture on Linux + Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _BITS_PPC_H +#define _BITS_PPC_H + +#ifndef _SYS_PLATFORM_PPC_H +# error "Never include this file directly; use instead." +#endif + +__BEGIN_DECLS + +/* Read the time base frequency. */ +extern uint64_t __ppc_get_timebase_freq (void); + +__END_DECLS + +#endif diff --git a/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c new file mode 100644 index 0000000..f62ed86 --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c @@ -0,0 +1,26 @@ +/* Get the frequency of the time base. + Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +uint64_t +__get_timebase_freq (void) +{ + return (uint64_t) __get_clockfreq (); +} +weak_alias (__get_timebase_freq, __ppc_get_timebase_freq) diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions b/sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions index 6fa0119..8d1c3a5 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions @@ -30,4 +30,7 @@ libc { GLIBC_2.11 { fallocate64; } + GLIBC_2.17 { + __ppc_get_timebase_freq; + } } diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist index 75123b9..ab96361 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/nptl/libc.abilist @@ -1775,6 +1775,7 @@ GLIBC_2.16 GLIBC_2.17 GLIBC_2.17 A secure_getenv F + __ppc_get_timebase_freq F GLIBC_2.2 GLIBC_2.2 A _IO_adjust_wcolumn F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions b/sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions index 8334741..3ff01d1 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions @@ -19,4 +19,7 @@ libc { setcontext; swapcontext; } + GLIBC_2.17 { + __ppc_get_timebase_freq; + } } diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist index e2484d3..a60b72a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/nptl/libc.abilist @@ -81,6 +81,7 @@ GLIBC_2.16 GLIBC_2.17 GLIBC_2.17 A secure_getenv F + __ppc_get_timebase_freq F GLIBC_2.3 GLIBC_2.3 A _Exit F diff --git a/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c b/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c new file mode 100644 index 0000000..a3f3bd6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/test-gettimebasefreq.c @@ -0,0 +1,62 @@ +/* Check __ppc_get_timebase_freq() for architecture changes + Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +/* Test if __ppc_get_timebase_freq() works and is different from zero. A read + failure might indicate a Linux Kernel change. + This test also use the frequency to compute the real elapsed time. */ + +#include +#include + +#include + +/* Maximum value of the Time Base Register: 2^60 - 1. */ +#define MAX_TB 0xFFFFFFFFFFFFFFF + +static int +do_test (void) +{ + uint64_t t1, t2, f, diff; + + t1 = __ppc_get_timebase (); + printf ("t1 = %"PRIu64"\n", t1); + + f = __ppc_get_timebase_freq (); + printf ("Time Base frequency = %"PRIu64" Hz\n", f); + + if (f == 0) { + printf ("Fail: The time base frequency can't be zero."); + return 1; + } + + t2 = __ppc_get_timebase (); + printf ("t2 = %"PRIu64"\n", t2); + + if (t2 > t1) { + diff = t2 - t1; + } else { + diff = (MAX_TB - t2) + t1; + } + + printf ("Elapsed time = %1.2f usecs\n", (double) diff * 1000000 / f ); + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" -- cgit v1.1