From f6346c6228754e8d659a13c16dfa2f3916ffada1 Mon Sep 17 00:00:00 2001
From: Serge Gautherie <32623169+SergeGautherie@users.noreply.github.com>
Date: Wed, 13 Aug 2025 12:25:43 +0200
Subject: [PATCH] [NTOS:KE] Fix X86_FEATURE_MTTR typo (#8330)

"MTTR" should read: "MTRR".
---
 ntoskrnl/include/internal/amd64/ke.h | 2 +-
 ntoskrnl/include/internal/i386/ke.h  | 2 +-
 ntoskrnl/ke/i386/cpu.c               | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/ntoskrnl/include/internal/amd64/ke.h b/ntoskrnl/include/internal/amd64/ke.h
index f9af4818b54..cfc69fe1d41 100644
--- a/ntoskrnl/include/internal/amd64/ke.h
+++ b/ntoskrnl/include/internal/amd64/ke.h
@@ -35,7 +35,7 @@ extern "C" {
 #define X86_FEATURE_PAE         0x00000040 /* physical address extension is present */
 #define X86_FEATURE_CX8         0x00000100 /* CMPXCHG8B instruction present */
 #define X86_FEATURE_SYSCALL     0x00000800 /* SYSCALL/SYSRET support present */
-#define X86_FEATURE_MTTR        0x00001000 /* Memory type range registers are present */
+#define X86_FEATURE_MTRR        0x00001000 /* Memory type range registers are present */
 #define X86_FEATURE_PGE         0x00002000 /* Page Global Enable */
 #define X86_FEATURE_CMOV        0x00008000 /* "Conditional move" instruction supported */
 #define X86_FEATURE_PAT         0x00010000 /* Page Attribute Table is supported */
diff --git a/ntoskrnl/include/internal/i386/ke.h b/ntoskrnl/include/internal/i386/ke.h
index 3d4675b30d8..dacc0a816d7 100644
--- a/ntoskrnl/include/internal/i386/ke.h
+++ b/ntoskrnl/include/internal/i386/ke.h
@@ -40,7 +40,7 @@ extern "C"
 #define X86_FEATURE_CX8         0x00000100 /* CMPXCHG8B instruction present */
 #define X86_FEATURE_APIC        0x00000200 /* APIC is present */
 #define X86_FEATURE_SYSCALL     0x00000800 /* SYSCALL/SYSRET support present */
-#define X86_FEATURE_MTTR        0x00001000 /* Memory type range registers are present */
+#define X86_FEATURE_MTRR        0x00001000 /* Memory type range registers are present */
 #define X86_FEATURE_PGE         0x00002000 /* Page Global Enable */
 #define X86_FEATURE_CMOV        0x00008000 /* "Conditional move" instruction supported */
 #define X86_FEATURE_PAT         0x00010000 /* Page Attribute Table is supported */
diff --git a/ntoskrnl/ke/i386/cpu.c b/ntoskrnl/ke/i386/cpu.c
index b54a94d13c2..6083f42e1f1 100644
--- a/ntoskrnl/ke/i386/cpu.c
+++ b/ntoskrnl/ke/i386/cpu.c
@@ -378,7 +378,7 @@ KiGetFeatureBits(VOID)
     if (CpuFeatures & X86_FEATURE_TSC)     FeatureBits |= KF_RDTSC;
     if (CpuFeatures & X86_FEATURE_CX8)     FeatureBits |= KF_CMPXCHG8B;
     if (CpuFeatures & X86_FEATURE_SYSCALL) FeatureBits |= KF_FAST_SYSCALL;
-    if (CpuFeatures & X86_FEATURE_MTTR)    FeatureBits |= KF_MTRR;
+    if (CpuFeatures & X86_FEATURE_MTRR)    FeatureBits |= KF_MTRR;
     if (CpuFeatures & X86_FEATURE_PGE)     FeatureBits |= KF_GLOBAL_PAGE | KF_CR4;
     if (CpuFeatures & X86_FEATURE_CMOV)    FeatureBits |= KF_CMOV;
     if (CpuFeatures & X86_FEATURE_PAT)     FeatureBits |= KF_PAT;