diff options
| -rw-r--r-- | UefiCpuPkg/CpuDxe/ApStartup.c | 135 |
1 files changed, 133 insertions, 2 deletions
diff --git a/UefiCpuPkg/CpuDxe/ApStartup.c b/UefiCpuPkg/CpuDxe/ApStartup.c index 7613b47942..38a9c0e6ea 100644 --- a/UefiCpuPkg/CpuDxe/ApStartup.c +++ b/UefiCpuPkg/CpuDxe/ApStartup.c @@ -1,7 +1,7 @@ /** @file
CPU DXE AP Startup
- Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -19,6 +19,47 @@ #pragma pack(1)
typedef struct {
+ UINT8 MoveIa32EferMsrToEcx[5];
+ UINT8 ReadIa32EferMsr[2];
+ UINT8 SetExecuteDisableBitEnableBit[4];
+ UINT8 WriteIa32EferMsr[2];
+
+#if defined (MDE_CPU_IA32)
+ UINT8 MovEaxCr3;
+ UINT32 Cr3Value;
+ UINT8 MovCr3Eax[3];
+
+ UINT8 MoveCr4ToEax[3];
+ UINT8 SetCr4Bit5[4];
+ UINT8 MoveEaxToCr4[3];
+
+ UINT8 MoveCr0ToEax[3];
+ UINT8 SetCr0PagingBit[4];
+ UINT8 MoveEaxToCr0[3];
+#endif
+} ENABLE_EXECUTE_DISABLE_CODE;
+
+ENABLE_EXECUTE_DISABLE_CODE mEnableExecuteDisableCodeTemplate = {
+ { 0xB9, 0x80, 0x00, 0x00, 0xC0 }, // mov ecx, 0xc0000080
+ { 0x0F, 0x32 }, // rdmsr
+ { 0x0F, 0xBA, 0xE8, 0x0B }, // bts eax, 11
+ { 0x0F, 0x30 }, // wrmsr
+
+#if defined (MDE_CPU_IA32)
+ 0xB8, 0x00000000, // mov eax, cr3 value
+ { 0x0F, 0x22, 0xd8 }, // mov cr3, eax
+
+ { 0x0F, 0x20, 0xE0 }, // mov eax, cr4
+ { 0x0F, 0xBA, 0xE8, 0x05 }, // bts eax, 5
+ { 0x0F, 0x22, 0xE0 }, // mov cr4, eax
+
+ { 0x0F, 0x20, 0xC0 }, // mov eax, cr0
+ { 0x0F, 0xBA, 0xE8, 0x1F }, // bts eax, 31
+ { 0x0F, 0x22, 0xC0 }, // mov cr0, eax
+#endif
+};
+
+typedef struct {
UINT8 JmpToCli[2];
UINT16 GdtLimit;
@@ -52,6 +93,12 @@ typedef struct { UINT8 MoveFlatDataSelectorFromAxToGs[2];
UINT8 MoveFlatDataSelectorFromAxToSs[2];
+ //
+ // Code placeholder to enable PAE Execute Disable for IA32
+ // and enable Execute Disable Bit for X64
+ //
+ ENABLE_EXECUTE_DISABLE_CODE EnableExecuteDisable;
+
#if defined (MDE_CPU_X64)
//
// Transition to X64
@@ -207,6 +254,17 @@ STARTUP_CODE mStartupCodeTemplate = { { 0x8e, 0xd0 }, // mov ss, ax
#if defined (MDE_CPU_X64)
+ //
+ // Code placeholder to enable Execute Disable Bit for X64
+ // Default is all NOP - No Operation
+ //
+ {
+ { 0x90, 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90 },
+ { 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90 },
+ },
+
0xB8, 0x00000000, // mov eax, cr3 value
{ 0x0F, 0x22, 0xd8 }, // mov cr3, eax
@@ -226,7 +284,29 @@ STARTUP_CODE mStartupCodeTemplate = { 0xEA, // FarJmp32LongMode
OFFSET_OF(STARTUP_CODE, MovEaxOrRaxCpuDxeEntry),
LINEAR_CODE64_SEL,
-#endif // defined (MDE_CPU_X64)
+#else
+ //
+ // Code placeholder to enable PAE Execute Disable for IA32
+ // Default is all NOP - No Operation
+ //
+ {
+ { 0x90, 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90 },
+ { 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90 },
+
+ 0x90, 0x90909090,
+ { 0x90, 0x90, 0x90 },
+
+ { 0x90, 0x90, 0x90 },
+ { 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90, 0x90 },
+
+ { 0x90, 0x90, 0x90 },
+ { 0x90, 0x90, 0x90, 0x90 },
+ { 0x90, 0x90, 0x90 },
+ },
+#endif
//0xeb, 0xfe, // jmp $
#if defined (MDE_CPU_X64)
@@ -241,6 +321,48 @@ STARTUP_CODE mStartupCodeTemplate = { volatile STARTUP_CODE *StartupCode = NULL;
/**
+ The function will check if BSP Execute Disable is enabled.
+ DxeIpl may have enabled Execute Disable for BSP,
+ APs need to get the status and sync up the settings.
+
+ @retval TRUE BSP Execute Disable is enabled.
+ @retval FALSE BSP Execute Disable is not enabled.
+
+**/
+BOOLEAN
+IsBspExecuteDisableEnabled (
+ VOID
+ )
+{
+ UINT32 RegEax;
+ UINT32 RegEdx;
+ UINT64 MsrRegisters;
+ BOOLEAN Enabled;
+
+ Enabled = FALSE;
+ AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
+ if (RegEax >= 0x80000001) {
+ AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);
+ //
+ // Cpuid 0x80000001
+ // Bit 20: Execute Disable Bit available.
+ //
+ if ((RegEdx & BIT20) != 0) {
+ MsrRegisters = AsmReadMsr64 (0xC0000080);
+ //
+ // Msr 0xC0000080
+ // Bit 11: Execute Disable Bit enable.
+ //
+ if ((MsrRegisters & BIT11) != 0) {
+ Enabled = TRUE;
+ }
+ }
+ }
+
+ return Enabled;
+}
+
+/**
Prepares Startup Code for APs.
This function prepares Startup Code for APs.
@@ -280,9 +402,18 @@ PrepareAPStartupCode ( StartupCode->FlatJmpOffset += (UINT32) StartAddress;
+ if (IsBspExecuteDisableEnabled ()) {
+ CopyMem (
+ (VOID*) &StartupCode->EnableExecuteDisable,
+ &mEnableExecuteDisableCodeTemplate,
+ sizeof (ENABLE_EXECUTE_DISABLE_CODE)
+ );
+ }
#if defined (MDE_CPU_X64)
StartupCode->Cr3Value = (UINT32) AsmReadCr3 ();
StartupCode->LongJmpOffset += (UINT32) StartAddress;
+#else
+ StartupCode->EnableExecuteDisable.Cr3Value = (UINT32) AsmReadCr3 ();
#endif
return EFI_SUCCESS;
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