linux/include/asm-powerpc/auxvec.h

#ifndef _ASM_POWERPC_AUXVEC_H
#define _ASM_POWERPC_AUXVEC_H

/*
 * We need to put in some extra aux table entries to tell glibc what
 * the cache block size is, so it can use the dcbz instruction safely.
 */
#define AT_DCACHEBSIZE		19
#define AT_ICACHEBSIZE		20
#define AT_UCACHEBSIZE		21
/* A special ignored type value for PPC, for glibc compatibility.  */
#define AT_IGNOREPPC		22

/* The vDSO location. We have to use the same value as x86 for glibc's
 * sake :-)
 */
#ifdef __powerpc64__
#define AT_SYSINFO_EHDR		33
#endif

#endif