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IntelFrameworkModulePkg/Csm: Add code to bypass NULL pointer detection

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Legacy has to access interrupt vector, BDA, etc. located in memory between
0-4095. To allow as much code as possible to be monitored by NULL pointer
detection, we add code to temporarily disable this feature right before
those memory access and enable it again afterwards.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Ayellet Wolman <ayellet.wolman@intel.com>
Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Jian J Wang
2017-10-09 22:01:49 +08:00
committed by Eric Dong
parent f8c1133bbb
commit d057d8c4e9
10 changed files with 338 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

101
IntelFrameworkModulePkg/Csm/BiosThunk/KeyboardDxe/BiosKeyboard.c
View File

@@ -1732,6 +1732,98 @@ CheckKeyboardConnect (
}
}
/**
Disable NULL pointer detection
*/
VOID
DisableNullDetection (
VOID
)
{
EFI_STATUS Status;
EFI_GCD_MEMORY_SPACE_DESCRIPTOR Desc;
if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT0) == 0) {
return;
}
//
// Check current capabilities and attributes
//
Status = gDS->GetMemorySpaceDescriptor (0, &Desc);
ASSERT_EFI_ERROR (Status);
//
// Try to add EFI_MEMORY_RP support if necessary
//
if ((Desc.Capabilities & EFI_MEMORY_RP) == 0) {
Desc.Capabilities |= EFI_MEMORY_RP;
Status = gDS->SetMemorySpaceCapabilities (0, EFI_PAGES_TO_SIZE(1),
Desc.Capabilities);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return;
}
}
//
// Don't bother if EFI_MEMORY_RP is already cleared.
//
if ((Desc.Attributes & EFI_MEMORY_RP) != 0) {
Desc.Attributes &= ~EFI_MEMORY_RP;
Status = gDS->SetMemorySpaceAttributes (0, EFI_PAGES_TO_SIZE(1),
Desc.Attributes);
ASSERT_EFI_ERROR (Status);
} else {
DEBUG ((DEBUG_WARN, "!!! Page 0 is supposed to be disabled !!!\r\n"));
}
}
/**
Enable NULL pointer detection
*/
VOID
EnableNullDetection (
VOID
)
{
EFI_STATUS Status;
EFI_GCD_MEMORY_SPACE_DESCRIPTOR Desc;
if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT0) == 0) {
return;
}
//
// Check current capabilities and attributes
//
Status = gDS->GetMemorySpaceDescriptor (0, &Desc);
ASSERT_EFI_ERROR (Status);
//
// Try to add EFI_MEMORY_RP support if necessary
//
if ((Desc.Capabilities & EFI_MEMORY_RP) == 0) {
Desc.Capabilities |= EFI_MEMORY_RP;
Status = gDS->SetMemorySpaceCapabilities (0, EFI_PAGES_TO_SIZE(1),
Desc.Capabilities);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return;
}
}
//
// Don't bother if EFI_MEMORY_RP is already set.
//
if ((Desc.Attributes & EFI_MEMORY_RP) == 0) {
Desc.Attributes |= EFI_MEMORY_RP;
Status = gDS->SetMemorySpaceAttributes (0, EFI_PAGES_TO_SIZE(1),
Desc.Attributes);
ASSERT_EFI_ERROR (Status);
}
}
/**
Timer event handler: read a series of key stroke from 8042
and put them into memory key buffer.
@@ -1839,6 +1931,11 @@ BiosKeyboardTimerHandler (
// 0 Right Shift pressed
//
// Disable NULL pointer detection temporarily
//
DisableNullDetection ();
//
// Clear the CTRL and ALT BDA flag
//
@@ -1916,6 +2013,10 @@ BiosKeyboardTimerHandler (
KbFlag1 &= ~0x0C;
*((UINT8 *) (UINTN) 0x417) = KbFlag1;
//
// Restore NULL pointer detection
//
EnableNullDetection ();
//
// Output EFI input key and shift/toggle state

2
IntelFrameworkModulePkg/Csm/BiosThunk/KeyboardDxe/BiosKeyboard.h
View File

@@ -18,6 +18,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <FrameworkDxe.h>
#include <Pi/PiDxeCis.h>
#include <Guid/StatusCodeDataTypeId.h>
#include <Protocol/SimpleTextIn.h>
@@ -33,6 +34,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Library/ReportStatusCodeLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseLib.h>
#include <Library/PcdLib.h>

2
IntelFrameworkModulePkg/Csm/BiosThunk/KeyboardDxe/KeyboardDxe.inf
View File

@@ -60,6 +60,7 @@
DebugLib
BaseLib
PcdLib
DxeServicesTableLib
[Protocols]
gEfiIsaIoProtocolGuid ## TO_START
@@ -73,6 +74,7 @@
[Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdFastPS2Detection ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask ## CONSUMES
[UserExtensions.TianoCore."ExtraFiles"]
KeyboardDxeExtra.uni