/* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing.

   Copyright (C) 2015-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <unistd.h>

#include <shlib-compat.h>

#include <dl-procinfo.h>

uint64_t __tcb_hwcap __attribute__ ((visibility ("hidden")));

uint32_t __tcb_platform __attribute__ ((visibility ("hidden")));

/* This function parses the HWCAP/HWCAP2 fields, adding the previous supported

   ISA bits, as well as converting the AT_PLATFORM string to a number.  This

   data is stored in two global variables that can be used later by the

   powerpc-specific code to store it into the TCB.  */

void

__tcb_parse_hwcap_and_convert_at_platform (void)

{

  uint64_t h1, h2;

  /* Read AT_PLATFORM string from auxv and convert it to a number.  */

  __tcb_platform = _dl_string_platform (GLRO (dl_platform));

  /* Read HWCAP and HWCAP2 from auxv.  */

  h1 = GLRO (dl_hwcap);

  h2 = GLRO (dl_hwcap2);

  /* hwcap contains only the latest supported ISA, the code checks which is

     and fills the previous supported ones.  */

  if (h2 & PPC_FEATURE2_ARCH_2_07)

    h1 |= PPC_FEATURE_ARCH_2_06

       | PPC_FEATURE_ARCH_2_05

       | PPC_FEATURE_POWER5_PLUS

       | PPC_FEATURE_POWER5

       | PPC_FEATURE_POWER4;

  else if (h1 & PPC_FEATURE_ARCH_2_06)

    h1 |= PPC_FEATURE_ARCH_2_05

       | PPC_FEATURE_POWER5_PLUS

       | PPC_FEATURE_POWER5

       | PPC_FEATURE_POWER4;

  else if (h1 & PPC_FEATURE_ARCH_2_05)

    h1 |= PPC_FEATURE_POWER5_PLUS

       | PPC_FEATURE_POWER5

       | PPC_FEATURE_POWER4;

  else if (h1 & PPC_FEATURE_POWER5_PLUS)

    h1 |= PPC_FEATURE_POWER5

       | PPC_FEATURE_POWER4;

  else if (h1 & PPC_FEATURE_POWER5)

    h1 |= PPC_FEATURE_POWER4;

  /* Consolidate both HWCAP and HWCAP2 into a single doubleword so that

     we can read both in a single load later.  */

  __tcb_hwcap = h2;

  __tcb_hwcap = (h1 << 32) | __tcb_hwcap;

}

#if IS_IN (rtld)

versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \

		  __parse_hwcap_and_convert_at_platform, GLIBC_2_23);

#endif

/* Export __parse_hwcap_and_convert_at_platform in libc.a.  This is used by

   GCC to make sure that the HWCAP/Platform bits are stored in the TCB when

   using __builtin_cpu_is()/__builtin_cpu_supports() in the static case.  */

#ifndef SHARED

weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \

	    __parse_hwcap_and_convert_at_platform);

#endif