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/* Auxiliary vector processing. Linux/PPC version.
Copyright (C) 2020 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
<https://www.gnu.org/licenses/>. */
#include <ldsodefs.h>
#if IS_IN (libc) && !defined SHARED
int GLRO(dl_cache_line_size);
#endif
/* Scan the Aux Vector for the "Data Cache Block Size" entry and assign it
to dl_cache_line_size. We have to detect 8xx processors, which
have buggy dcbz implementations that cannot report page faults
correctly. That requires reading SPR, which is a privileged
operation. Fortunately 2.2.18 and later emulates PowerPC mfspr
reads from the PVR register. */
#ifndef __powerpc64__
#define DL_PLATFORM_AUXV \
case AT_DCACHEBSIZE: \
{ \
unsigned pvr = 0; \
asm ("mfspr %0, 287" : "=r" (pvr)); \
if ((pvr & 0xffff0000) == 0x00500000) \
break; \
} \
GLRO(dl_cache_line_size) = av->a_un.a_val; \
break;
#else
#define DL_PLATFORM_AUXV \
case AT_DCACHEBSIZE: \
GLRO(dl_cache_line_size) = av->a_un.a_val; \
break;
#endif
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