[glibc] <sys/platform/x86.h>: Add LASS support

[glibc] <sys/platform/x86.h>: Add LASS support

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=aa528a579b3fc98eab43986619087cafe3f260d0

commit aa528a579b3fc98eab43986619087cafe3f260d0
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Apr 5 09:21:34 2023 -0700

    <sys/platform/x86.h>: Add LASS support
    
    Add Linear Address Space Separation (LASS) support to <sys/platform/x86.h>.
    Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>

Diff:
---
 manual/platform.texi               | 3 +++
 sysdeps/x86/bits/platform/x86.h    | 1 +
 sysdeps/x86/tst-get-cpu-features.c | 1 +
 3 files changed, 5 insertions(+)

diff --git a/manual/platform.texi b/manual/platform.texi
index a6e33b1572..be04194c88 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -406,6 +406,9 @@ the indirect branch predictor barrier (IBPB).
 @item
 @code{LAM} -- Linear Address Masking.
 
+@item
+@code{LASS} -- Linear Address Space Separation.
+
 @item
 @code{LBR} -- Architectural LBR.
 
diff --git a/sysdeps/x86/bits/platform/x86.h b/sysdeps/x86/bits/platform/x86.h
index 6fc3b69651..c9ee8fcf90 100644
--- a/sysdeps/x86/bits/platform/x86.h
+++ b/sysdeps/x86/bits/platform/x86.h
@@ -291,6 +291,7 @@ enum
   x86_cpu_RAO_INT		= x86_cpu_index_7_ecx_1_eax + 3,
   x86_cpu_AVX_VNNI		= x86_cpu_index_7_ecx_1_eax + 4,
   x86_cpu_AVX512_BF16		= x86_cpu_index_7_ecx_1_eax + 5,
+  x86_cpu_LASS			= x86_cpu_index_7_ecx_1_eax + 6,
   x86_cpu_FZLRM			= x86_cpu_index_7_ecx_1_eax + 10,
   x86_cpu_FSRS			= x86_cpu_index_7_ecx_1_eax + 11,
   x86_cpu_FSRCS			= x86_cpu_index_7_ecx_1_eax + 12,
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index 6a3f29db98..9da561a559 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -203,6 +203,7 @@ do_test (void)
   CHECK_CPU_FEATURE_PRESENT (RAO_INT);
   CHECK_CPU_FEATURE_PRESENT (AVX_VNNI);
   CHECK_CPU_FEATURE_PRESENT (AVX512_BF16);
+  CHECK_CPU_FEATURE_PRESENT (LASS);
   CHECK_CPU_FEATURE_PRESENT (FZLRM);
   CHECK_CPU_FEATURE_PRESENT (FSRS);
   CHECK_CPU_FEATURE_PRESENT (FSRCS);