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<sys/platform/x86.h>: Add Intel LAM support

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Add Intel Linear Address Masking (LAM) support to <sys/platform/x86.h>.
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.
This commit is contained in:
H.J. Lu
2020-12-21 19:56:10 -08:00
parent bca0283815
commit a2e5da2cf4
3 changed files with 7 additions and 0 deletions
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3
manual/platform.texi
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@ -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.

3
sysdeps/x86/sys/platform/x86.h
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@ -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. */

1
sysdeps/x86/tst-get-cpu-features.c
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@ -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);