MdePkg: PciExpressLib support variable size MMCONF

Add support for arbitrary sized MMCONF by introducing a new PCD.
Add a return value to point out invalid PCI addresses.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Marcello Sylvester Bauer <marcello.bauer@9elements.com>
Cc: Patrick Rudolph <patrick.rudolph@9elements.com>
Cc: Christian Walter <christian.walter@9elements.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>

MdePkg/Include/Library/PciExpressLib.h

@@ -2,8 +2,9 @@
   Provides services to access PCI Configuration Space using the MMIO PCI Express window.
 
   This library is identical to the PCI Library, except the access method for performing PCI
-  configuration cycles must be through the 256 MB PCI Express MMIO window whose base address
+  configuration cycles must be through the PCI Express MMIO window whose base address
-  is defined by PcdPciExpressBaseAddress.
+  is defined by PcdPciExpressBaseAddress and size defined by PcdPciExpressBaseSize.
+
 
 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent

MdePkg/Library/BasePciExpressLib/BasePciExpressLib.inf

@@ -1,7 +1,7 @@
 ## @file
-#  Instance of PCI Express Library using the 256 MB PCI Express MMIO window.
+#  Instance of PCI Express Library using the variable size PCI Express MMIO window.
 #
-#  PCI Express Library that uses the 256 MB PCI Express MMIO window to perform
+#  PCI Express Library that uses the variable size PCI Express MMIO window to perform
 #  PCI Configuration cycles. Layers on top of an I/O Library instance.
 #
 #  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
@@ -38,4 +38,4 @@
 
 [Pcd]
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress  ## CONSUMES
-
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseSize  ## CONSUMES

MdePkg/Library/BasePciExpressLib/PciExpressLib.c

@@ -22,7 +22,8 @@
 
 /**
   Assert the validity of a PCI address. A valid PCI address should contain 1's
-  only in the low 28 bits.
+  only in the low 28 bits. PcdPciExpressBaseSize limits the size to the real
+  number of PCI busses in this segment.
 
   @param  A The address to validate.
 
@@ -79,6 +80,24 @@ GetPciExpressBaseAddress (
   return (VOID*)(UINTN) PcdGet64 (PcdPciExpressBaseAddress);
 }
 
+/**
+  Gets the size of PCI Express.
+
+  This internal functions retrieves PCI Express Base Size via a PCD entry
+  PcdPciExpressBaseSize.
+
+  @return The base size of PCI Express.
+
+**/
+STATIC
+UINTN
+PcdPciExpressBaseSize (
+  VOID
+  )
+{
+  return (UINTN) PcdGet64 (PcdPciExpressBaseSize);
+}
+
 /**
   Reads an 8-bit PCI configuration register.
 
@@ -91,7 +110,8 @@ GetPciExpressBaseAddress (
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
 
-  @return The read value from the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The read value from the PCI configuration register.
 
 **/
 UINT8
@@ -101,6 +121,9 @@ PciExpressRead8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioRead8 ((UINTN) GetPciExpressBaseAddress () + Address);
 }
 
@@ -117,7 +140,8 @@ PciExpressRead8 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written to the PCI configuration register.
 
 **/
 UINT8
@@ -128,6 +152,9 @@ PciExpressWrite8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioWrite8 ((UINTN) GetPciExpressBaseAddress () + Address, Value);
 }
 
@@ -148,7 +175,8 @@ PciExpressWrite8 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written to the PCI configuration register.
 
 **/
 UINT8
@@ -159,6 +187,9 @@ PciExpressOr8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioOr8 ((UINTN) GetPciExpressBaseAddress () + Address, OrData);
 }
 
@@ -179,7 +210,8 @@ PciExpressOr8 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -190,6 +222,9 @@ PciExpressAnd8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioAnd8 ((UINTN) GetPciExpressBaseAddress () + Address, AndData);
 }
 
@@ -212,7 +247,8 @@ PciExpressAnd8 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -224,6 +260,9 @@ PciExpressAndThenOr8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioAndThenOr8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            AndData,
@@ -249,7 +288,9 @@ PciExpressAndThenOr8 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..7.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value of the bit field read from the PCI configuration
+                register.
 
 **/
 UINT8
@@ -261,6 +302,9 @@ PciExpressBitFieldRead8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldRead8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -289,7 +333,8 @@ PciExpressBitFieldRead8 (
                     Range 0..7.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -302,6 +347,9 @@ PciExpressBitFieldWrite8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldWrite8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -334,7 +382,8 @@ PciExpressBitFieldWrite8 (
                     Range 0..7.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -347,6 +396,9 @@ PciExpressBitFieldOr8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldOr8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -379,7 +431,8 @@ PciExpressBitFieldOr8 (
                     Range 0..7.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -392,6 +445,9 @@ PciExpressBitFieldAnd8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldAnd8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -428,7 +484,8 @@ PciExpressBitFieldAnd8 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -442,6 +499,9 @@ PciExpressBitFieldAndThenOr8 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldAndThenOr8 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -464,7 +524,8 @@ PciExpressBitFieldAndThenOr8 (
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
 
-  @return The read value from the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The read value from the PCI configuration register.
 
 **/
 UINT16
@@ -474,6 +535,9 @@ PciExpressRead16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioRead16 ((UINTN) GetPciExpressBaseAddress () + Address);
 }
 
@@ -491,7 +555,8 @@ PciExpressRead16 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written to the PCI configuration register.
 
 **/
 UINT16
@@ -502,6 +567,9 @@ PciExpressWrite16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioWrite16 ((UINTN) GetPciExpressBaseAddress () + Address, Value);
 }
 
@@ -523,7 +591,8 @@ PciExpressWrite16 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -534,6 +603,9 @@ PciExpressOr16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioOr16 ((UINTN) GetPciExpressBaseAddress () + Address, OrData);
 }
 
@@ -555,7 +627,8 @@ PciExpressOr16 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -566,6 +639,9 @@ PciExpressAnd16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioAnd16 ((UINTN) GetPciExpressBaseAddress () + Address, AndData);
 }
 
@@ -589,7 +665,8 @@ PciExpressAnd16 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -601,6 +678,9 @@ PciExpressAndThenOr16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioAndThenOr16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            AndData,
@@ -627,7 +707,9 @@ PciExpressAndThenOr16 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..15.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value of the bit field read from the PCI configuration
+                  register.
 
 **/
 UINT16
@@ -639,6 +721,9 @@ PciExpressBitFieldRead16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldRead16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -668,7 +753,8 @@ PciExpressBitFieldRead16 (
                     Range 0..15.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -681,6 +767,9 @@ PciExpressBitFieldWrite16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldWrite16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -714,7 +803,8 @@ PciExpressBitFieldWrite16 (
                     Range 0..15.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -727,6 +817,9 @@ PciExpressBitFieldOr16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldOr16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -760,7 +853,8 @@ PciExpressBitFieldOr16 (
                     Range 0..15.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -773,6 +867,9 @@ PciExpressBitFieldAnd16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldAnd16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -810,7 +907,8 @@ PciExpressBitFieldAnd16 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -824,6 +922,9 @@ PciExpressBitFieldAndThenOr16 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldAndThenOr16 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -846,7 +947,8 @@ PciExpressBitFieldAndThenOr16 (
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
 
-  @return The read value from the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The read value from the PCI configuration register.
 
 **/
 UINT32
@@ -856,6 +958,9 @@ PciExpressRead32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioRead32 ((UINTN) GetPciExpressBaseAddress () + Address);
 }
 
@@ -873,7 +978,8 @@ PciExpressRead32 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written to the PCI configuration register.
 
 **/
 UINT32
@@ -884,6 +990,9 @@ PciExpressWrite32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioWrite32 ((UINTN) GetPciExpressBaseAddress () + Address, Value);
 }
 
@@ -905,7 +1014,8 @@ PciExpressWrite32 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -916,6 +1026,9 @@ PciExpressOr32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioOr32 ((UINTN) GetPciExpressBaseAddress () + Address, OrData);
 }
 
@@ -937,7 +1050,8 @@ PciExpressOr32 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -948,6 +1062,9 @@ PciExpressAnd32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioAnd32 ((UINTN) GetPciExpressBaseAddress () + Address, AndData);
 }
 
@@ -971,7 +1088,8 @@ PciExpressAnd32 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -983,6 +1101,9 @@ PciExpressAndThenOr32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioAndThenOr32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            AndData,
@@ -1009,7 +1130,9 @@ PciExpressAndThenOr32 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..31.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value of the bit field read from the PCI
+                      configuration register.
 
 **/
 UINT32
@@ -1021,6 +1144,9 @@ PciExpressBitFieldRead32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldRead32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -1050,7 +1176,8 @@ PciExpressBitFieldRead32 (
                     Range 0..31.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1063,6 +1190,9 @@ PciExpressBitFieldWrite32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldWrite32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -1096,7 +1226,8 @@ PciExpressBitFieldWrite32 (
                     Range 0..31.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1109,6 +1240,9 @@ PciExpressBitFieldOr32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldOr32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -1142,7 +1276,8 @@ PciExpressBitFieldOr32 (
                     Range 0..31.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1155,6 +1290,9 @@ PciExpressBitFieldAnd32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldAnd32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -1192,7 +1330,8 @@ PciExpressBitFieldAnd32 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF  Invalid PCI address.
+  @retval other       The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1206,6 +1345,9 @@ PciExpressBitFieldAndThenOr32 (
   )
 {
   ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= PcdPciExpressBaseSize()) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldAndThenOr32 (
            (UINTN) GetPciExpressBaseAddress () + Address,
            StartBit,
@@ -1235,7 +1377,8 @@ PciExpressBitFieldAndThenOr32 (
   @param  Size          The size in bytes of the transfer.
   @param  Buffer        The pointer to a buffer receiving the data read.
 
-  @return Size read data from StartAddress.
+  @retval (UINTN)-1  Invalid PCI address.
+  @retval other      Size read data from StartAddress.
 
 **/
 UINTN
@@ -1249,6 +1392,9 @@ PciExpressReadBuffer (
   UINTN   ReturnValue;
 
   ASSERT_INVALID_PCI_ADDRESS (StartAddress);
+  if (StartAddress >= PcdPciExpressBaseSize()) {
+    return (UINTN) -1;
+  }
   ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
   if (Size == 0) {
@@ -1335,7 +1481,8 @@ PciExpressReadBuffer (
   @param  Size          The size in bytes of the transfer.
   @param  Buffer        The pointer to a buffer containing the data to write.
 
-  @return Size written to StartAddress.
+  @retval (UINTN)-1  Invalid PCI address.
+  @retval other      Size written to StartAddress.
 
 **/
 UINTN
@@ -1349,6 +1496,9 @@ PciExpressWriteBuffer (
   UINTN                             ReturnValue;
 
   ASSERT_INVALID_PCI_ADDRESS (StartAddress);
+  if (StartAddress >= PcdPciExpressBaseSize()) {
+    return (UINTN) -1;
+  }
   ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
   if (Size == 0) {

MdePkg/Library/DxeRuntimePciExpressLib/DxeRuntimePciExpressLib.inf

@@ -47,3 +47,4 @@
 
 [Pcd]
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress  ## CONSUMES
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseSize  ## CONSUMES

MdePkg/Library/DxeRuntimePciExpressLib/PciExpressLib.c

@@ -25,6 +25,16 @@
 #include <Library/DxeServicesTableLib.h>
 #include <Library/UefiRuntimeLib.h>
 
+/**
+ Assert the validity of a PCI address. A valid PCI address should contain 1's
+ only in the low 28 bits.
+
+ @param A The address to validate.
+
+**/
+#define ASSERT_INVALID_PCI_ADDRESS(A) \
+ ASSERT (((A) & ~0xfffffff) == 0)
+
 ///
 /// Define table for mapping PCI Express MMIO physical addresses to virtual addresses at OS runtime
 ///
@@ -39,9 +49,10 @@ typedef struct {
 EFI_EVENT                               mDxeRuntimePciExpressLibVirtualNotifyEvent = NULL;
 
 ///
-/// Module global that contains the base physical address of the PCI Express MMIO range.
+/// Module global that contains the base physical address and size of the PCI Express MMIO range.
 ///
 UINTN                                   mDxeRuntimePciExpressLibPciExpressBaseAddress = 0;
+UINTN                                   mDxeRuntimePciExpressLibPciExpressBaseSize = 0;
 
 ///
 /// The number of PCI devices that have been registered for runtime access.
@@ -120,6 +131,7 @@ DxeRuntimePciExpressLibConstructor (
   // Cache the physical address of the PCI Express MMIO range into a module global variable
   //
   mDxeRuntimePciExpressLibPciExpressBaseAddress = (UINTN) PcdGet64 (PcdPciExpressBaseAddress);
+  mDxeRuntimePciExpressLibPciExpressBaseSize = (UINTN) PcdGet64 (PcdPciExpressBaseSize);
 
   //
   // Register SetVirtualAddressMap () notify function
@@ -179,8 +191,12 @@ DxeRuntimePciExpressLibDestructor (
   This internal functions retrieves PCI Express Base Address via a PCD entry
   PcdPciExpressBaseAddress.
 
-  @param  Address  The address that encodes the PCI Bus, Device, Function and Register.
+  If Address > 0x0FFFFFFF, then ASSERT().
-  @return          The base address of PCI Express.
+
+  @param  Address   The address that encodes the PCI Bus, Device, Function and Register.
+
+  @retval (UINTN)-1 Invalid PCI address.
+  @retval other     The base address of PCI Express.
 
 **/
 UINTN
@@ -193,7 +209,14 @@ GetPciExpressAddress (
   //
   // Make sure Address is valid
   //
-  ASSERT (((Address) & ~0xfffffff) == 0);
+  ASSERT_INVALID_PCI_ADDRESS (Address);
+
+  //
+  // Make sure the Address is in MMCONF address space
+  //
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINTN) -1;
+  }
 
   //
   // Convert Address to a physical address in the MMIO PCI Express range
@@ -236,7 +259,6 @@ GetPciExpressAddress (
   //
   // No match was found.  This is a critical error at OS runtime, so ASSERT() and force a breakpoint.
   //
-  ASSERT (FALSE);
   CpuBreakpoint();
 
   //
@@ -288,7 +310,14 @@ PciExpressRegisterForRuntimeAccess (
   //
   // Make sure Address is valid
   //
-  ASSERT (((Address) & ~0xfffffff) == 0);
+ ASSERT_INVALID_PCI_ADDRESS (Address);
+
+  //
+  // Make sure the Address is in MMCONF address space
+  //
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return RETURN_UNSUPPORTED;
+  }
 
   //
   // Convert Address to a physical address in the MMIO PCI Express range
@@ -354,8 +383,8 @@ PciExpressRegisterForRuntimeAccess (
 
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
-
+  @retval 0xFF  Invalid PCI address.
-  @return The read value from the PCI configuration register.
+  @retval other The read value from the PCI configuration register.
 
 **/
 UINT8
@@ -364,6 +393,10 @@ PciExpressRead8 (
   IN      UINTN                     Address
   )
 {
+  ASSERT_INVALID_PCI_ADDRESS (Address);
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioRead8 (GetPciExpressAddress (Address));
 }
 
@@ -380,7 +413,8 @@ PciExpressRead8 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written to the PCI configuration register.
 
 **/
 UINT8
@@ -390,6 +424,9 @@ PciExpressWrite8 (
   IN      UINT8                     Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioWrite8 (GetPciExpressAddress (Address), Value);
 }
 
@@ -410,7 +447,8 @@ PciExpressWrite8 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -420,6 +458,9 @@ PciExpressOr8 (
   IN      UINT8                     OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioOr8 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -440,7 +481,8 @@ PciExpressOr8 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other  The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -450,6 +492,9 @@ PciExpressAnd8 (
   IN      UINT8                     AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioAnd8 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -472,7 +517,8 @@ PciExpressAnd8 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -483,6 +529,9 @@ PciExpressAndThenOr8 (
   IN      UINT8                     OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioAndThenOr8 (
            GetPciExpressAddress (Address),
            AndData,
@@ -508,7 +557,8 @@ PciExpressAndThenOr8 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..7.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value of the bit field read from the PCI configuration register.
 
 **/
 UINT8
@@ -519,6 +569,9 @@ PciExpressBitFieldRead8 (
   IN      UINTN                     EndBit
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldRead8 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -547,7 +600,8 @@ PciExpressBitFieldRead8 (
                     Range 0..7.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -559,6 +613,9 @@ PciExpressBitFieldWrite8 (
   IN      UINT8                     Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldWrite8 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -591,7 +648,8 @@ PciExpressBitFieldWrite8 (
                     Range 0..7.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -603,6 +661,9 @@ PciExpressBitFieldOr8 (
   IN      UINT8                     OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldOr8 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -635,7 +696,8 @@ PciExpressBitFieldOr8 (
                     Range 0..7.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -647,6 +709,9 @@ PciExpressBitFieldAnd8 (
   IN      UINT8                     AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldAnd8 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -683,7 +748,8 @@ PciExpressBitFieldAnd8 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFF  Invalid PCI address.
+  @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -696,6 +762,9 @@ PciExpressBitFieldAndThenOr8 (
   IN      UINT8                     OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT8) -1;
+  }
   return MmioBitFieldAndThenOr8 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -718,7 +787,8 @@ PciExpressBitFieldAndThenOr8 (
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
 
-  @return The read value from the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The read value from the PCI configuration register.
 
 **/
 UINT16
@@ -727,6 +797,9 @@ PciExpressRead16 (
   IN      UINTN                     Address
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioRead16 (GetPciExpressAddress (Address));
 }
 
@@ -744,7 +817,8 @@ PciExpressRead16 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written to the PCI configuration register.
 
 **/
 UINT16
@@ -754,6 +828,9 @@ PciExpressWrite16 (
   IN      UINT16                    Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioWrite16 (GetPciExpressAddress (Address), Value);
 }
 
@@ -775,7 +852,8 @@ PciExpressWrite16 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -785,6 +863,9 @@ PciExpressOr16 (
   IN      UINT16                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioOr16 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -806,7 +887,8 @@ PciExpressOr16 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -816,6 +898,9 @@ PciExpressAnd16 (
   IN      UINT16                    AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioAnd16 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -839,7 +924,8 @@ PciExpressAnd16 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -850,6 +936,9 @@ PciExpressAndThenOr16 (
   IN      UINT16                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioAndThenOr16 (
            GetPciExpressAddress (Address),
            AndData,
@@ -876,7 +965,8 @@ PciExpressAndThenOr16 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..15.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value of the bit field read from the PCI configuration register.
 
 **/
 UINT16
@@ -887,6 +977,9 @@ PciExpressBitFieldRead16 (
   IN      UINTN                     EndBit
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldRead16 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -916,7 +1009,8 @@ PciExpressBitFieldRead16 (
                     Range 0..15.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -928,6 +1022,9 @@ PciExpressBitFieldWrite16 (
   IN      UINT16                    Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldWrite16 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -961,7 +1058,8 @@ PciExpressBitFieldWrite16 (
                     Range 0..15.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -973,6 +1071,9 @@ PciExpressBitFieldOr16 (
   IN      UINT16                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldOr16 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1006,7 +1107,8 @@ PciExpressBitFieldOr16 (
                     Range 0..15.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -1018,6 +1120,9 @@ PciExpressBitFieldAnd16 (
   IN      UINT16                    AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldAnd16 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1055,7 +1160,8 @@ PciExpressBitFieldAnd16 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -1068,6 +1174,9 @@ PciExpressBitFieldAndThenOr16 (
   IN      UINT16                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT16) -1;
+  }
   return MmioBitFieldAndThenOr16 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1090,7 +1199,8 @@ PciExpressBitFieldAndThenOr16 (
   @param  Address The address that encodes the PCI Bus, Device, Function and
                   Register.
 
-  @return The read value from the PCI configuration register.
+  @retval 0xFFFF  Invalid PCI address.
+  @retval other   The read value from the PCI configuration register.
 
 **/
 UINT32
@@ -1099,6 +1209,9 @@ PciExpressRead32 (
   IN      UINTN                     Address
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioRead32 (GetPciExpressAddress (Address));
 }
 
@@ -1116,7 +1229,8 @@ PciExpressRead32 (
                   Register.
   @param  Value   The value to write.
 
-  @return The value written to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written to the PCI configuration register.
 
 **/
 UINT32
@@ -1126,6 +1240,9 @@ PciExpressWrite32 (
   IN      UINT32                    Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioWrite32 (GetPciExpressAddress (Address), Value);
 }
 
@@ -1147,7 +1264,8 @@ PciExpressWrite32 (
                   Register.
   @param  OrData  The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1157,6 +1275,9 @@ PciExpressOr32 (
   IN      UINT32                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioOr32 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -1178,7 +1299,8 @@ PciExpressOr32 (
                   Register.
   @param  AndData The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1188,6 +1310,9 @@ PciExpressAnd32 (
   IN      UINT32                    AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioAnd32 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -1211,7 +1336,8 @@ PciExpressAnd32 (
   @param  AndData The value to AND with the PCI configuration register.
   @param  OrData  The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1222,6 +1348,9 @@ PciExpressAndThenOr32 (
   IN      UINT32                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioAndThenOr32 (
            GetPciExpressAddress (Address),
            AndData,
@@ -1248,7 +1377,8 @@ PciExpressAndThenOr32 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..31.
 
-  @return The value of the bit field read from the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value of the bit field read from the PCI configuration register.
 
 **/
 UINT32
@@ -1259,6 +1389,9 @@ PciExpressBitFieldRead32 (
   IN      UINTN                     EndBit
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldRead32 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1288,7 +1421,8 @@ PciExpressBitFieldRead32 (
                     Range 0..31.
   @param  Value     The new value of the bit field.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1300,6 +1434,9 @@ PciExpressBitFieldWrite32 (
   IN      UINT32                    Value
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldWrite32 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1333,7 +1470,8 @@ PciExpressBitFieldWrite32 (
                     Range 0..31.
   @param  OrData    The value to OR with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1345,6 +1483,9 @@ PciExpressBitFieldOr32 (
   IN      UINT32                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldOr32 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1378,7 +1519,8 @@ PciExpressBitFieldOr32 (
                     Range 0..31.
   @param  AndData   The value to AND with the PCI configuration register.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1390,6 +1532,9 @@ PciExpressBitFieldAnd32 (
   IN      UINT32                    AndData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldAnd32 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1427,7 +1572,8 @@ PciExpressBitFieldAnd32 (
   @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the result of the AND operation.
 
-  @return The value written back to the PCI configuration register.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1440,6 +1586,9 @@ PciExpressBitFieldAndThenOr32 (
   IN      UINT32                    OrData
   )
 {
+  if (Address >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINT32) -1;
+  }
   return MmioBitFieldAndThenOr32 (
            GetPciExpressAddress (Address),
            StartBit,
@@ -1469,7 +1618,8 @@ PciExpressBitFieldAndThenOr32 (
   @param  Size          The size in bytes of the transfer.
   @param  Buffer        The pointer to a buffer receiving the data read.
 
-  @return Size read data from StartAddress.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      Size read data from StartAddress.
 
 **/
 UINTN
@@ -1485,9 +1635,16 @@ PciExpressReadBuffer (
   //
   // Make sure Address is valid
   //
-  ASSERT (((StartAddress) & ~0xfffffff) == 0);
+  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
   ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
+  //
+  // Make sure the Address is in MMCONF address space
+  //
+  if (StartAddress >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINTN) -1;
+  }
+
   if (Size == 0) {
     return Size;
   }
@@ -1572,7 +1729,8 @@ PciExpressReadBuffer (
   @param  Size          The size in bytes of the transfer.
   @param  Buffer        The pointer to a buffer containing the data to write.
 
-  @return Size written to StartAddress.
+  @retval 0xFFFFFFFF Invalid PCI address.
+  @retval other      Size written to StartAddress.
 
 **/
 UINTN
@@ -1588,9 +1746,16 @@ PciExpressWriteBuffer (
   //
   // Make sure Address is valid
   //
-  ASSERT (((StartAddress) & ~0xfffffff) == 0);
+  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
   ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
+  //
+  // Make sure the Address is in MMCONF address space
+  //
+  if (StartAddress >= mDxeRuntimePciExpressLibPciExpressBaseSize) {
+    return (UINTN) -1;
+  }
+
   if (Size == 0) {
     return 0;
   }

MdePkg/Library/SmmPciExpressLib/PciExpressLib.c

@@ -20,9 +20,10 @@
 #include <Library/PcdLib.h>
 
 ///
-/// Module global that contains the base physical address of the PCI Express MMIO range.
+/// Module global that contains the base physical address and size of the PCI Express MMIO range.
 ///
 UINTN mSmmPciExpressLibPciExpressBaseAddress = 0;
+UINTN mSmmPciExpressLibPciExpressBaseSize = 0;
 
 /**
  The constructor function caches the PCI Express Base Address
@@ -40,9 +41,10 @@ SmmPciExpressLibConstructor (
  )
 {
  //
- // Cache the physical address of the PCI Express MMIO range into a module global variable
+ // Cache the physical address and size of the PCI Express MMIO range into a module global variable
  //
  mSmmPciExpressLibPciExpressBaseAddress = (UINTN) PcdGet64 (PcdPciExpressBaseAddress);
+ mSmmPciExpressLibPciExpressBaseSize = (UINTN) PcdGet64 (PcdPciExpressBaseSize);
 
  return EFI_SUCCESS;
 }
@@ -97,8 +99,12 @@ PciExpressRegisterForRuntimeAccess (
  mSmmPciExpressLibPciExpressBaseAddress is initialized in the library constructor from PCD entry
  PcdPciExpressBaseAddress.
 
+ If Address > 0x0FFFFFFF, then ASSERT().
+
  @param Address The address that encodes the PCI Bus, Device, Function and Register.
- @return MMIO address corresponding to Address.
+
+ @retval (UINTN)-1 Invalid PCI address.
+ @retval other     MMIO address corresponding to Address.
 
 **/
 UINTN
@@ -110,6 +116,12 @@ GetPciExpressAddress (
  // Make sure Address is valid
  //
  ASSERT_INVALID_PCI_ADDRESS (Address);
+ //
+ // Make sure the Address is in MMCONF address space
+ //
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINTN) -1;
+ }
  return mSmmPciExpressLibPciExpressBaseAddress + Address;
 }
 
@@ -125,7 +137,8 @@ GetPciExpressAddress (
  @param Address The address that encodes the PCI Bus, Device, Function and
  Register.
 
- @return The read value from the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The read value from the PCI configuration register.
 
 **/
 UINT8
@@ -134,6 +147,9 @@ PciExpressRead8 (
  IN UINTN Address
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioRead8 (GetPciExpressAddress (Address));
 }
 
@@ -150,7 +166,8 @@ PciExpressRead8 (
  Register.
  @param Value The value to write.
 
- @return The value written to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written to the PCI configuration register.
 
 **/
 UINT8
@@ -160,6 +177,9 @@ PciExpressWrite8 (
  IN UINT8 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioWrite8 (GetPciExpressAddress (Address), Value);
 }
 
@@ -180,7 +200,8 @@ PciExpressWrite8 (
  Register.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -190,6 +211,9 @@ PciExpressOr8 (
  IN UINT8 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioOr8 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -210,7 +234,8 @@ PciExpressOr8 (
  Register.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -220,6 +245,9 @@ PciExpressAnd8 (
  IN UINT8 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioAnd8 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -242,7 +270,8 @@ PciExpressAnd8 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -253,6 +282,9 @@ PciExpressAndThenOr8 (
  IN UINT8 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioAndThenOr8 (
  GetPciExpressAddress (Address),
  AndData,
@@ -278,7 +310,8 @@ PciExpressAndThenOr8 (
  @param EndBit The ordinal of the most significant bit in the bit field.
  Range 0..7.
 
- @return The value of the bit field read from the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value of the bit field read from the PCI configuration register.
 
 **/
 UINT8
@@ -289,6 +322,9 @@ PciExpressBitFieldRead8 (
  IN UINTN EndBit
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioBitFieldRead8 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -317,7 +353,8 @@ PciExpressBitFieldRead8 (
  Range 0..7.
  @param Value The new value of the bit field.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -329,6 +366,9 @@ PciExpressBitFieldWrite8 (
  IN UINT8 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioBitFieldWrite8 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -361,7 +401,8 @@ PciExpressBitFieldWrite8 (
  Range 0..7.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -373,6 +414,9 @@ PciExpressBitFieldOr8 (
  IN UINT8 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioBitFieldOr8 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -405,7 +449,8 @@ PciExpressBitFieldOr8 (
  Range 0..7.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -417,6 +462,9 @@ PciExpressBitFieldAnd8 (
  IN UINT8 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioBitFieldAnd8 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -453,7 +501,8 @@ PciExpressBitFieldAnd8 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The value written back to the PCI configuration register.
 
 **/
 UINT8
@@ -466,6 +515,9 @@ PciExpressBitFieldAndThenOr8 (
  IN UINT8 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT8) -1;
+ }
  return MmioBitFieldAndThenOr8 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -488,7 +540,8 @@ PciExpressBitFieldAndThenOr8 (
  @param Address The address that encodes the PCI Bus, Device, Function and
  Register.
 
- @return The read value from the PCI configuration register.
+ @retval 0xFF  Invalid PCI address.
+ @retval other The read value from the PCI configuration register.
 
 **/
 UINT16
@@ -497,6 +550,9 @@ PciExpressRead16 (
  IN UINTN Address
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioRead16 (GetPciExpressAddress (Address));
 }
 
@@ -514,7 +570,8 @@ PciExpressRead16 (
  Register.
  @param Value The value to write.
 
- @return The value written to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written to the PCI configuration register.
 
 **/
 UINT16
@@ -524,6 +581,9 @@ PciExpressWrite16 (
  IN UINT16 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioWrite16 (GetPciExpressAddress (Address), Value);
 }
 
@@ -545,7 +605,8 @@ PciExpressWrite16 (
  Register.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -555,6 +616,9 @@ PciExpressOr16 (
  IN UINT16 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioOr16 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -576,7 +640,8 @@ PciExpressOr16 (
  Register.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -586,6 +651,9 @@ PciExpressAnd16 (
  IN UINT16 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioAnd16 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -609,7 +677,8 @@ PciExpressAnd16 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -620,6 +689,9 @@ PciExpressAndThenOr16 (
  IN UINT16 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioAndThenOr16 (
  GetPciExpressAddress (Address),
  AndData,
@@ -646,7 +718,8 @@ PciExpressAndThenOr16 (
  @param EndBit The ordinal of the most significant bit in the bit field.
  Range 0..15.
 
- @return The value of the bit field read from the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value of the bit field read from the PCI configuration register.
 
 **/
 UINT16
@@ -657,6 +730,9 @@ PciExpressBitFieldRead16 (
  IN UINTN EndBit
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioBitFieldRead16 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -686,7 +762,8 @@ PciExpressBitFieldRead16 (
  Range 0..15.
  @param Value The new value of the bit field.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -698,6 +775,9 @@ PciExpressBitFieldWrite16 (
  IN UINT16 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioBitFieldWrite16 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -731,7 +811,8 @@ PciExpressBitFieldWrite16 (
  Range 0..15.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -743,6 +824,9 @@ PciExpressBitFieldOr16 (
  IN UINT16 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioBitFieldOr16 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -776,7 +860,8 @@ PciExpressBitFieldOr16 (
  Range 0..15.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -788,6 +873,9 @@ PciExpressBitFieldAnd16 (
  IN UINT16 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioBitFieldAnd16 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -825,7 +913,8 @@ PciExpressBitFieldAnd16 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFF  Invalid PCI address.
+ @retval other   The value written back to the PCI configuration register.
 
 **/
 UINT16
@@ -838,6 +927,9 @@ PciExpressBitFieldAndThenOr16 (
  IN UINT16 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT16) -1;
+ }
  return MmioBitFieldAndThenOr16 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -860,7 +952,8 @@ PciExpressBitFieldAndThenOr16 (
  @param Address The address that encodes the PCI Bus, Device, Function and
  Register.
 
- @return The read value from the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The read value from the PCI configuration register.
 
 **/
 UINT32
@@ -869,6 +962,9 @@ PciExpressRead32 (
  IN UINTN Address
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioRead32 (GetPciExpressAddress (Address));
 }
 
@@ -886,7 +982,8 @@ PciExpressRead32 (
  Register.
  @param Value The value to write.
 
- @return The value written to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written to the PCI configuration register.
 
 **/
 UINT32
@@ -896,6 +993,9 @@ PciExpressWrite32 (
  IN UINT32 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioWrite32 (GetPciExpressAddress (Address), Value);
 }
 
@@ -917,7 +1017,8 @@ PciExpressWrite32 (
  Register.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -927,6 +1028,9 @@ PciExpressOr32 (
  IN UINT32 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioOr32 (GetPciExpressAddress (Address), OrData);
 }
 
@@ -948,7 +1052,8 @@ PciExpressOr32 (
  Register.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -958,6 +1063,9 @@ PciExpressAnd32 (
  IN UINT32 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioAnd32 (GetPciExpressAddress (Address), AndData);
 }
 
@@ -981,7 +1089,8 @@ PciExpressAnd32 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -992,6 +1101,9 @@ PciExpressAndThenOr32 (
  IN UINT32 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioAndThenOr32 (
  GetPciExpressAddress (Address),
  AndData,
@@ -1018,7 +1130,8 @@ PciExpressAndThenOr32 (
  @param EndBit The ordinal of the most significant bit in the bit field.
  Range 0..31.
 
- @return The value of the bit field read from the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value of the bit field read from the PCI configuration register.
 
 **/
 UINT32
@@ -1029,6 +1142,9 @@ PciExpressBitFieldRead32 (
  IN UINTN EndBit
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioBitFieldRead32 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -1058,7 +1174,8 @@ PciExpressBitFieldRead32 (
  Range 0..31.
  @param Value The new value of the bit field.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1070,6 +1187,9 @@ PciExpressBitFieldWrite32 (
  IN UINT32 Value
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioBitFieldWrite32 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -1103,7 +1223,8 @@ PciExpressBitFieldWrite32 (
  Range 0..31.
  @param OrData The value to OR with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1115,6 +1236,9 @@ PciExpressBitFieldOr32 (
  IN UINT32 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioBitFieldOr32 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -1148,7 +1272,8 @@ PciExpressBitFieldOr32 (
  Range 0..31.
  @param AndData The value to AND with the PCI configuration register.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1160,6 +1285,9 @@ PciExpressBitFieldAnd32 (
  IN UINT32 AndData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioBitFieldAnd32 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -1197,7 +1325,8 @@ PciExpressBitFieldAnd32 (
  @param AndData The value to AND with the PCI configuration register.
  @param OrData The value to OR with the result of the AND operation.
 
- @return The value written back to the PCI configuration register.
+ @retval 0xFFFFFFFF Invalid PCI address.
+ @retval other      The value written back to the PCI configuration register.
 
 **/
 UINT32
@@ -1210,6 +1339,9 @@ PciExpressBitFieldAndThenOr32 (
  IN UINT32 OrData
  )
 {
+ if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINT32) -1;
+ }
  return MmioBitFieldAndThenOr32 (
  GetPciExpressAddress (Address),
  StartBit,
@@ -1239,7 +1371,8 @@ PciExpressBitFieldAndThenOr32 (
  @param Size The size in bytes of the transfer.
  @param Buffer The pointer to a buffer receiving the data read.
 
- @return Size read data from StartAddress.
+ @retval (UINTN)-1 Invalid PCI address.
+ @retval other     Size read data from StartAddress.
 
 **/
 UINTN
@@ -1258,6 +1391,13 @@ PciExpressReadBuffer (
  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
+ //
+ // Make sure the Address is in MMCONF address space
+ //
+ if (StartAddress >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINTN) -1;
+ }
+
  if (Size == 0) {
  return Size;
  }
@@ -1342,7 +1482,8 @@ PciExpressReadBuffer (
  @param Size The size in bytes of the transfer.
  @param Buffer The pointer to a buffer containing the data to write.
 
- @return Size written to StartAddress.
+ @retval (UINTN)-1 Invalid PCI address.
+ @retval other     Size written to StartAddress.
 
 **/
 UINTN
@@ -1361,6 +1502,13 @@ PciExpressWriteBuffer (
  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
 
+ //
+ // Make sure the Address is in MMCONF address space
+ //
+ if (StartAddress >= mSmmPciExpressLibPciExpressBaseSize) {
+   return (UINTN) -1;
+ }
+
 
  if (Size == 0) {
  return 0;

MdePkg/Library/SmmPciExpressLib/SmmPciExpressLib.inf

@@ -35,3 +35,4 @@
 
 [Pcd]
  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress ## CONSUMES
+ gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseSize  ## CONSUMES

MdePkg/MdePkg.dec

@@ -2274,6 +2274,10 @@
   # @Prompt PCI Express Base Address.
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0xE0000000|UINT64|0x0000000a
 
+  ## This value is used to set the size of PCI express hierarchy. The default is 256 MB.
+  # @Prompt PCI Express Base Size.
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseSize|0x10000000|UINT64|0x0000000f
+
   ## Default current ISO 639-2 language: English & French.
   # @Prompt Default Value of LangCodes Variable.
   gEfiMdePkgTokenSpaceGuid.PcdUefiVariableDefaultLangCodes|"engfraengfra"|VOID*|0x0000001c