From a2e5da2cf471b5ac849bcd7d9960466b9cd28a35 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Mon, 21 Dec 2020 19:56:10 -0800 Subject: [PATCH] : Add Intel LAM support Add Intel Linear Address Masking (LAM) support to . HAS_CPU_FEATURE (LAM) can be used to detect if LAM is enabled in CPU. LAM modifies the checking that is applied to 64-bit linear addresses, allowing software to use of the untranslated address bits for metadata. --- manual/platform.texi | 3 +++ sysdeps/x86/sys/platform/x86.h | 3 +++ sysdeps/x86/tst-get-cpu-features.c | 1 + 3 files changed, 7 insertions(+) diff --git a/manual/platform.texi b/manual/platform.texi index 8fec2933d64..b67683aeb3c 100644 --- a/manual/platform.texi +++ b/manual/platform.texi @@ -377,6 +377,9 @@ the indirect branch predictor barrier (IBPB). @item @code{KL} -- AES Key Locker instructions. +@item +@code{LAM} -- Linear Address Masking. + @item @code{L1D_FLUSH} -- IA32_FLUSH_CMD MSR. diff --git a/sysdeps/x86/sys/platform/x86.h b/sysdeps/x86/sys/platform/x86.h index 3ef92b04e81..99d8c9b0ab0 100644 --- a/sysdeps/x86/sys/platform/x86.h +++ b/sysdeps/x86/sys/platform/x86.h @@ -317,6 +317,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int) #define bit_cpu_FSRS (1u << 11) #define bit_cpu_FSRCS (1u << 12) #define bit_cpu_HRESET (1u << 22) +#define bit_cpu_LAM (1u << 26) /* COMMON_CPUID_INDEX_19. */ @@ -541,6 +542,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int) #define index_cpu_FSRS COMMON_CPUID_INDEX_7_ECX_1 #define index_cpu_FSRCS COMMON_CPUID_INDEX_7_ECX_1 #define index_cpu_HRESET COMMON_CPUID_INDEX_7_ECX_1 +#define index_cpu_LAM COMMON_CPUID_INDEX_7_ECX_1 /* COMMON_CPUID_INDEX_19. */ @@ -765,6 +767,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int) #define reg_FSRS eax #define reg_FSRCS eax #define reg_HRESET eax +#define reg_LAM eax /* COMMON_CPUID_INDEX_19. */ diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c index 667aa27117a..6f1e925a6ac 100644 --- a/sysdeps/x86/tst-get-cpu-features.c +++ b/sysdeps/x86/tst-get-cpu-features.c @@ -227,6 +227,7 @@ do_test (void) CHECK_CPU_FEATURE (FSRS); CHECK_CPU_FEATURE (FSRCS); CHECK_CPU_FEATURE (HRESET); + CHECK_CPU_FEATURE (LAM); CHECK_CPU_FEATURE (AESKLE); CHECK_CPU_FEATURE (WIDE_KL); -- 2.47.2