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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* Host specific cpu identification for ppc.
*/
#include "qemu/osdep.h"
#include "host/cpuinfo.h"
#include <asm/cputable.h>
#ifdef CONFIG_GETAUXVAL
# include <sys/auxv.h>
#else
# include "elf.h"
#endif
unsigned cpuinfo;
/* Called both as constructor and (possibly) via other constructors. */
unsigned __attribute__((constructor)) cpuinfo_init(void)
{
unsigned info = cpuinfo;
unsigned long hwcap, hwcap2;
if (info) {
return info;
}
hwcap = qemu_getauxval(AT_HWCAP);
hwcap2 = qemu_getauxval(AT_HWCAP2);
info = CPUINFO_ALWAYS;
/* Version numbers are monotonic, and so imply all lower versions. */
if (hwcap2 & PPC_FEATURE2_ARCH_3_1) {
info |= CPUINFO_V3_1 | CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
} else if (hwcap2 & PPC_FEATURE2_ARCH_3_00) {
info |= CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
} else if (hwcap2 & PPC_FEATURE2_ARCH_2_07) {
info |= CPUINFO_V2_07 | CPUINFO_V2_06;
} else if (hwcap & PPC_FEATURE_ARCH_2_06) {
info |= CPUINFO_V2_06;
}
if (hwcap2 & PPC_FEATURE2_ISEL) {
info |= CPUINFO_ISEL;
}
if (hwcap & PPC_FEATURE_HAS_ALTIVEC) {
info |= CPUINFO_ALTIVEC;
/* We only care about the portion of VSX that overlaps Altivec. */
if (hwcap & PPC_FEATURE_HAS_VSX) {
info |= CPUINFO_VSX;
/*
* We use VSX especially for little-endian, but we should
* always have both anyway, since VSX came with Power7
* and crypto came with Power8.
*/
if (hwcap2 & PPC_FEATURE2_VEC_CRYPTO) {
info |= CPUINFO_CRYPTO;
}
}
}
cpuinfo = info;
return info;
}
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