mirror of https://gitlab.com/qemu-project/qemu
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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* Host specific cpu identification for ppc.
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*/
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#include "qemu/osdep.h"
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#include "host/cpuinfo.h"
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#ifdef CONFIG_LINUX
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# include <asm/cputable.h>
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# ifdef CONFIG_GETAUXVAL
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# include <sys/auxv.h>
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# else
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# include "elf.h"
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# endif
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#endif
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#ifdef __FreeBSD__
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# include <machine/cpu.h>
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# ifndef PPC_FEATURE2_ARCH_3_1
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# define PPC_FEATURE2_ARCH_3_1 0
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# endif
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# define PPC_FEATURE2_VEC_CRYPTO PPC_FEATURE2_HAS_VEC_CRYPTO
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#endif
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unsigned cpuinfo;
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/* Called both as constructor and (possibly) via other constructors. */
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unsigned __attribute__((constructor)) cpuinfo_init(void)
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{
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unsigned info = cpuinfo;
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if (info) {
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return info;
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}
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info = CPUINFO_ALWAYS;
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#if defined(CONFIG_LINUX) || defined(__FreeBSD__)
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unsigned long hwcap = qemu_getauxval(AT_HWCAP);
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unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2);
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/* Version numbers are monotonic, and so imply all lower versions. */
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if (hwcap2 & PPC_FEATURE2_ARCH_3_1) {
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info |= CPUINFO_V3_1 | CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
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} else if (hwcap2 & PPC_FEATURE2_ARCH_3_00) {
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info |= CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
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} else if (hwcap2 & PPC_FEATURE2_ARCH_2_07) {
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info |= CPUINFO_V2_07 | CPUINFO_V2_06;
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} else if (hwcap & PPC_FEATURE_ARCH_2_06) {
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info |= CPUINFO_V2_06;
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}
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if (hwcap2 & PPC_FEATURE2_ISEL) {
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info |= CPUINFO_ISEL;
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}
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if (hwcap & PPC_FEATURE_HAS_ALTIVEC) {
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info |= CPUINFO_ALTIVEC;
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/* We only care about the portion of VSX that overlaps Altivec. */
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if (hwcap & PPC_FEATURE_HAS_VSX) {
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info |= CPUINFO_VSX;
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/*
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* We use VSX especially for little-endian, but we should
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* always have both anyway, since VSX came with Power7
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* and crypto came with Power8.
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*/
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if (hwcap2 & PPC_FEATURE2_VEC_CRYPTO) {
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info |= CPUINFO_CRYPTO;
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}
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}
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}
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#endif
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cpuinfo = info;
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return info;
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}
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