| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 2 | // See https://llvm.org/LICENSE.txt for license information. |
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| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 4 | |
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| 5 | __attribute__((visibility("hidden" ), nocommon)) |
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| 6 | _Bool __aarch64_has_sme_and_tpidr2_el0; |
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| 7 | |
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| 8 | // We have multiple ways to check that the function has SME, depending on our |
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| 9 | // target. |
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| 10 | // * For Linux we can use __getauxval(). |
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| 11 | // * For newlib we can use __aarch64_sme_accessible(). |
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| 12 | |
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| 13 | #if defined(__linux__) |
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| 14 | |
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| 15 | #ifndef AT_HWCAP2 |
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| 16 | #define AT_HWCAP2 26 |
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| 17 | #endif |
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| 18 | |
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| 19 | #ifndef HWCAP2_SME |
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| 20 | #define HWCAP2_SME (1 << 23) |
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| 21 | #endif |
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| 22 | |
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| 23 | extern unsigned long int __getauxval (unsigned long int); |
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| 24 | |
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| 25 | static _Bool has_sme(void) { |
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| 26 | return __getauxval(AT_HWCAP2) & HWCAP2_SME; |
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| 27 | } |
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| 28 | |
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| 29 | #else // defined(__linux__) |
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| 30 | |
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| 31 | #if defined(COMPILER_RT_SHARED_LIB) |
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| 32 | __attribute__((weak)) |
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| 33 | #endif |
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| 34 | extern _Bool __aarch64_sme_accessible(void); |
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| 35 | |
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| 36 | static _Bool has_sme(void) { |
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| 37 | #if defined(COMPILER_RT_SHARED_LIB) |
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| 38 | if (!__aarch64_sme_accessible) |
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| 39 | return 0; |
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| 40 | #endif |
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| 41 | return __aarch64_sme_accessible(); |
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| 42 | } |
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| 43 | |
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| 44 | #endif // defined(__linux__) |
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| 45 | |
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| 46 | #if __GNUC__ >= 9 |
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| 47 | #pragma GCC diagnostic ignored "-Wprio-ctor-dtor" |
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| 48 | #endif |
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| 49 | __attribute__((constructor(90))) |
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| 50 | static void init_aarch64_has_sme(void) { |
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| 51 | __aarch64_has_sme_and_tpidr2_el0 = has_sme(); |
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| 52 | } |
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| 53 | |
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