dl-auxv.h

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/* Auxiliary vector processing for Linux/Alpha.
   Copyright (C) 2007 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* Scan the Aux Vector for the cache shape entries.  */

long __libc_alpha_cache_shape[4] = { -2, -2, -2, -2 };

#define DL_PLATFORM_AUXV				\
      case AT_L1I_CACHESHAPE:				\
	__libc_alpha_cache_shape[0] = av->a_un.a_val;	\
	break;						\
      case AT_L1D_CACHESHAPE:				\
	__libc_alpha_cache_shape[1] = av->a_un.a_val;	\
	break;						\
      case AT_L2_CACHESHAPE:				\
	__libc_alpha_cache_shape[2] = av->a_un.a_val;	\
	break;						\
      case AT_L3_CACHESHAPE:				\
	__libc_alpha_cache_shape[3] = av->a_un.a_val;	\
	break;