52 lines
1.9 KiB
Diff
52 lines
1.9 KiB
Diff
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commit 28c13ae5bbc81aa2ae67890ce53e65257d4703a4
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Mon Jul 6 06:57:08 2020 -0700
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x86: Detect Extended Feature Disable (XFD)
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An extension called extended feature disable (XFD) is an extension added
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for Intel AMX to the XSAVE feature set that allows an operating system
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to enable a feature while preventing specific user threads from using
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the feature.
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diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
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index 535b3cb2d25b245b..e7ea9e8ece3e8211 100644
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--- a/sysdeps/x86/cpu-features.h
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+++ b/sysdeps/x86/cpu-features.h
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@@ -393,6 +393,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define bit_cpu_XSAVEC (1u << 1)
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#define bit_cpu_XGETBV_ECX_1 (1u << 2)
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#define bit_cpu_XSAVES (1u << 3)
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+#define bit_cpu_XFD (1u << 4)
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/* COMMON_CPUID_INDEX_80000007. */
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@@ -578,6 +579,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define index_cpu_XSAVEC COMMON_CPUID_INDEX_D_ECX_1
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#define index_cpu_XGETBV_ECX_1 COMMON_CPUID_INDEX_D_ECX_1
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#define index_cpu_XSAVES COMMON_CPUID_INDEX_D_ECX_1
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+#define index_cpu_XFD COMMON_CPUID_INDEX_D_ECX_1
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/* COMMON_CPUID_INDEX_80000007. */
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@@ -763,6 +765,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define reg_XSAVEC eax
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#define reg_XGETBV_ECX_1 eax
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#define reg_XSAVES eax
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+#define reg_XFD eax
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/* COMMON_CPUID_INDEX_80000007. */
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diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
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index c4d91be3a48de886..c56f309ba0736c0d 100644
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--- a/sysdeps/x86/tst-get-cpu-features.c
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+++ b/sysdeps/x86/tst-get-cpu-features.c
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@@ -212,6 +212,7 @@ do_test (void)
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CHECK_CPU_FEATURE (XSAVEC);
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CHECK_CPU_FEATURE (XGETBV_ECX_1);
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CHECK_CPU_FEATURE (XSAVES);
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+ CHECK_CPU_FEATURE (XFD);
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CHECK_CPU_FEATURE (INVARIANT_TSC);
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CHECK_CPU_FEATURE (WBNOINVD);
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CHECK_CPU_FEATURE (AVX512_BF16);
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