AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-12-23 19:30:10 +00:00
Code Issues Packages Projects Releases Wiki Activity

x86: Detect Extended Feature Disable (XFD)

Browse Source 
An extension called extended feature disable (XFD) is an extension added
for Intel AMX to the XSAVE feature set that allows an operating system
to enable a feature while preventing specific user threads from using
the feature.
This commit is contained in:
H.J. Lu 2020-07-06 06:57:08 -07:00
parent f8b4630ef6
commit 28c13ae5bb
2 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sysdeps/x86/cpu-features.h
View File

@ -393,6 +393,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define bit_cpu_XSAVEC (1u << 1)
#define bit_cpu_XGETBV_ECX_1 (1u << 2)
#define bit_cpu_XSAVES (1u << 3)
#define bit_cpu_XFD (1u << 4)
/* COMMON_CPUID_INDEX_80000007. */
@ -578,6 +579,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define index_cpu_XSAVEC COMMON_CPUID_INDEX_D_ECX_1
#define index_cpu_XGETBV_ECX_1 COMMON_CPUID_INDEX_D_ECX_1
#define index_cpu_XSAVES COMMON_CPUID_INDEX_D_ECX_1
#define index_cpu_XFD COMMON_CPUID_INDEX_D_ECX_1
/* COMMON_CPUID_INDEX_80000007. */
@ -763,6 +765,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define reg_XSAVEC eax
#define reg_XGETBV_ECX_1 eax
#define reg_XSAVES eax
#define reg_XFD eax
/* COMMON_CPUID_INDEX_80000007. */

1
sysdeps/x86/tst-get-cpu-features.c
View File

@ -214,6 +214,7 @@ do_test (void)
CHECK_CPU_FEATURE (XSAVEC);
CHECK_CPU_FEATURE (XGETBV_ECX_1);
CHECK_CPU_FEATURE (XSAVES);
CHECK_CPU_FEATURE (XFD);
CHECK_CPU_FEATURE (INVARIANT_TSC);
CHECK_CPU_FEATURE (WBNOINVD);
CHECK_CPU_FEATURE (AVX512_BF16);