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467 lines
18 KiB
C
467 lines
18 KiB
C
/** @file
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Legacy Region Support
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Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are
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licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "LegacyRegion.h"
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//
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// 440 PAM map.
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//
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// PAM Range Offset Bits Operation
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// =============== ====== ==== ===============================================================
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// 0xC0000-0xC3FFF 0x5a 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xC4000-0xC7FFF 0x5a 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xC8000-0xCBFFF 0x5b 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xCC000-0xCFFFF 0x5b 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xD0000-0xD3FFF 0x5c 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xD4000-0xD7FFF 0x5c 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xD8000-0xDBFFF 0x5d 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xDC000-0xDFFFF 0x5d 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xE0000-0xE3FFF 0x5e 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xE4000-0xE7FFF 0x5e 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xE8000-0xEBFFF 0x5f 1:0 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xEC000-0xEFFFF 0x5f 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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// 0xF0000-0xFFFFF 0x59 5:4 00 = DRAM Disabled, 01= Read Only, 10 = Write Only, 11 = Normal
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//
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STATIC LEGACY_MEMORY_SECTION_INFO mSectionArray[] = {
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{0xC0000, SIZE_16KB, FALSE, FALSE},
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{0xC4000, SIZE_16KB, FALSE, FALSE},
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{0xC8000, SIZE_16KB, FALSE, FALSE},
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{0xCC000, SIZE_16KB, FALSE, FALSE},
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{0xD0000, SIZE_16KB, FALSE, FALSE},
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{0xD4000, SIZE_16KB, FALSE, FALSE},
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{0xD8000, SIZE_16KB, FALSE, FALSE},
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{0xDC000, SIZE_16KB, FALSE, FALSE},
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{0xE0000, SIZE_16KB, FALSE, FALSE},
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{0xE4000, SIZE_16KB, FALSE, FALSE},
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{0xE8000, SIZE_16KB, FALSE, FALSE},
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{0xEC000, SIZE_16KB, FALSE, FALSE},
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{0xF0000, SIZE_64KB, FALSE, FALSE}
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};
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STATIC PAM_REGISTER_VALUE mRegisterValues[] = {
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{REG_PAM1_OFFSET, 0x01, 0x02},
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{REG_PAM1_OFFSET, 0x10, 0x20},
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{REG_PAM2_OFFSET, 0x01, 0x02},
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{REG_PAM2_OFFSET, 0x10, 0x20},
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{REG_PAM3_OFFSET, 0x01, 0x02},
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{REG_PAM3_OFFSET, 0x10, 0x20},
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{REG_PAM4_OFFSET, 0x01, 0x02},
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{REG_PAM4_OFFSET, 0x10, 0x20},
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{REG_PAM5_OFFSET, 0x01, 0x02},
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{REG_PAM5_OFFSET, 0x10, 0x20},
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{REG_PAM6_OFFSET, 0x01, 0x02},
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{REG_PAM6_OFFSET, 0x10, 0x20},
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{REG_PAM0_OFFSET, 0x10, 0x20}
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};
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//
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// Handle used to install the Legacy Region Protocol
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//
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STATIC EFI_HANDLE mHandle = NULL;
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//
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// Instance of the Legacy Region Protocol to install into the handle database
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//
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STATIC EFI_LEGACY_REGION2_PROTOCOL mLegacyRegion2 = {
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LegacyRegion2Decode,
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LegacyRegion2Lock,
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LegacyRegion2BootLock,
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LegacyRegion2Unlock,
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LegacyRegionGetInfo
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};
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STATIC
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EFI_STATUS
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LegacyRegionManipulationInternal (
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IN UINT32 Start,
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IN UINT32 Length,
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IN BOOLEAN *ReadEnable,
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IN BOOLEAN *WriteEnable,
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OUT UINT32 *Granularity
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)
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{
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UINT32 EndAddress;
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UINTN Index;
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UINTN StartIndex;
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//
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// Validate input parameters.
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//
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if (Length == 0 || Granularity == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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EndAddress = Start + Length - 1;
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if ((Start < PAM_BASE_ADDRESS) || EndAddress > PAM_LIMIT_ADDRESS) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Loop to find the start PAM.
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//
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StartIndex = 0;
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for (Index = 0; Index < (sizeof(mSectionArray) / sizeof (mSectionArray[0])); Index++) {
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if ((Start >= mSectionArray[Index].Start) && (Start < (mSectionArray[Index].Start + mSectionArray[Index].Length))) {
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StartIndex = Index;
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break;
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}
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}
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ASSERT (Index < (sizeof(mSectionArray) / sizeof (mSectionArray[0])));
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//
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// Program PAM until end PAM is encountered
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//
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for (Index = StartIndex; Index < (sizeof(mSectionArray) / sizeof (mSectionArray[0])); Index++) {
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if (ReadEnable != NULL) {
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if (*ReadEnable) {
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PciOr8 (
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PCI_LIB_ADDRESS(PAM_PCI_BUS, PAM_PCI_DEV, PAM_PCI_FUNC, mRegisterValues[Index].PAMRegOffset),
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mRegisterValues[Index].ReadEnableData
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);
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} else {
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PciAnd8 (
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PCI_LIB_ADDRESS(PAM_PCI_BUS, PAM_PCI_DEV, PAM_PCI_FUNC, mRegisterValues[Index].PAMRegOffset),
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(UINT8) (~mRegisterValues[Index].ReadEnableData)
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);
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}
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}
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if (WriteEnable != NULL) {
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if (*WriteEnable) {
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PciOr8 (
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PCI_LIB_ADDRESS(PAM_PCI_BUS, PAM_PCI_DEV, PAM_PCI_FUNC, mRegisterValues[Index].PAMRegOffset),
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mRegisterValues[Index].WriteEnableData
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);
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} else {
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PciAnd8 (
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PCI_LIB_ADDRESS(PAM_PCI_BUS, PAM_PCI_DEV, PAM_PCI_FUNC, mRegisterValues[Index].PAMRegOffset),
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(UINT8) (~mRegisterValues[Index].WriteEnableData)
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);
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}
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}
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//
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// If the end PAM is encountered, record its length as granularity and jump out.
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//
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if ((EndAddress >= mSectionArray[Index].Start) && (EndAddress < (mSectionArray[Index].Start + mSectionArray[Index].Length))) {
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*Granularity = mSectionArray[Index].Length;
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break;
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}
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}
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ASSERT (Index < (sizeof(mSectionArray) / sizeof (mSectionArray[0])));
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return EFI_SUCCESS;
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}
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STATIC
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EFI_STATUS
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LegacyRegionGetInfoInternal (
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OUT UINT32 *DescriptorCount,
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OUT LEGACY_MEMORY_SECTION_INFO **Descriptor
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)
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{
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UINTN Index;
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UINT8 PamValue;
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//
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// Check input parameters
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//
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if (DescriptorCount == NULL || Descriptor == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Fill in current status of legacy region.
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//
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*DescriptorCount = sizeof(mSectionArray) / sizeof (mSectionArray[0]);
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for (Index = 0; Index < *DescriptorCount; Index++) {
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PamValue = PciRead8 (PCI_LIB_ADDRESS(PAM_PCI_BUS, PAM_PCI_DEV, PAM_PCI_FUNC, mRegisterValues[Index].PAMRegOffset));
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mSectionArray[Index].ReadEnabled = FALSE;
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if ((PamValue & mRegisterValues[Index].ReadEnableData) != 0) {
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mSectionArray[Index].ReadEnabled = TRUE;
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}
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mSectionArray[Index].WriteEnabled = FALSE;
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if ((PamValue & mRegisterValues[Index].WriteEnableData) != 0) {
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mSectionArray[Index].WriteEnabled = TRUE;
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}
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}
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*Descriptor = mSectionArray;
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return EFI_SUCCESS;
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}
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/**
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Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.
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If the On parameter evaluates to TRUE, this function enables memory reads in the address range
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Start to (Start + Length - 1).
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If the On parameter evaluates to FALSE, this function disables memory reads in the address range
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Start to (Start + Length - 1).
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose attributes
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should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address
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was not aligned to a region's starting address or if the length
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was greater than the number of bytes in the first region.
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@param On[in] Decode / Non-Decode flag.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Decode (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity,
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IN BOOLEAN *On
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)
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{
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return LegacyRegionManipulationInternal (Start, Length, On, NULL, Granularity);
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}
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/**
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Modify the hardware to disallow memory attribute changes in a region.
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This function makes the attributes of a region read only. Once a region is boot-locked with this
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function, the read and write attributes of that region cannot be changed until a power cycle has
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reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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@retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in
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a way that will not affect memory regions outside the legacy memory
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region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2BootLock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
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return EFI_INVALID_PARAMETER;
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}
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return EFI_UNSUPPORTED;
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}
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/**
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Modify the hardware to disallow memory writes in a region.
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This function changes the attributes of a memory range to not allow writes.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Lock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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BOOLEAN WriteEnable;
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WriteEnable = FALSE;
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return LegacyRegionManipulationInternal (Start, Length, NULL, &WriteEnable, Granularity);
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}
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/**
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Modify the hardware to allow memory writes in a region.
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This function changes the attributes of a memory range to allow writes.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Unlock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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BOOLEAN WriteEnable;
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WriteEnable = TRUE;
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return LegacyRegionManipulationInternal (Start, Length, NULL, &WriteEnable, Granularity);
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}
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/**
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Get region information for the attributes of the Legacy Region.
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This function is used to discover the granularity of the attributes for the memory in the legacy
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region. Each attribute may have a different granularity and the granularity may not be the same
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for all memory ranges in the legacy region.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor
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buffer.
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@param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy
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region information is deposited. This buffer will contain a list of
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DescriptorCount number of region descriptors. This function will
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provide the memory for the buffer.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionGetInfo (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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OUT UINT32 *DescriptorCount,
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OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor
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)
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{
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LEGACY_MEMORY_SECTION_INFO *SectionInfo;
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UINT32 SectionCount;
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EFI_LEGACY_REGION_DESCRIPTOR *DescriptorArray;
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UINTN Index;
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UINTN DescriptorIndex;
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//
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// Get section numbers and information
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//
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LegacyRegionGetInfoInternal (&SectionCount, &SectionInfo);
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//
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// Each section has 3 descriptors, corresponding to readability, writeability, and lock status.
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//
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DescriptorArray = AllocatePool (sizeof (EFI_LEGACY_REGION_DESCRIPTOR) * SectionCount * 3);
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if (DescriptorArray == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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DescriptorIndex = 0;
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for (Index = 0; Index < SectionCount; Index++) {
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DescriptorArray[DescriptorIndex].Start = SectionInfo[Index].Start;
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DescriptorArray[DescriptorIndex].Length = SectionInfo[Index].Length;
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DescriptorArray[DescriptorIndex].Granularity = SectionInfo[Index].Length;
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if (SectionInfo[Index].ReadEnabled) {
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DescriptorArray[DescriptorIndex].Attribute = LegacyRegionDecoded;
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} else {
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DescriptorArray[DescriptorIndex].Attribute = LegacyRegionNotDecoded;
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}
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DescriptorIndex++;
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//
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// Create descriptor for writeability, according to lock status
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//
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DescriptorArray[DescriptorIndex].Start = SectionInfo[Index].Start;
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DescriptorArray[DescriptorIndex].Length = SectionInfo[Index].Length;
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DescriptorArray[DescriptorIndex].Granularity = SectionInfo[Index].Length;
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if (SectionInfo[Index].WriteEnabled) {
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DescriptorArray[DescriptorIndex].Attribute = LegacyRegionWriteEnabled;
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} else {
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DescriptorArray[DescriptorIndex].Attribute = LegacyRegionWriteDisabled;
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}
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DescriptorIndex++;
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//
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// Chipset does not support bootlock.
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//
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DescriptorArray[DescriptorIndex].Start = SectionInfo[Index].Start;
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DescriptorArray[DescriptorIndex].Length = SectionInfo[Index].Length;
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DescriptorArray[DescriptorIndex].Granularity = SectionInfo[Index].Length;
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DescriptorArray[DescriptorIndex].Attribute = LegacyRegionNotLocked;
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DescriptorIndex++;
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}
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*DescriptorCount = (UINT32) DescriptorIndex;
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*Descriptor = DescriptorArray;
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return EFI_SUCCESS;
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}
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/**
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Initialize Legacy Region support
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@retval EFI_SUCCESS Successfully initialized
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**/
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EFI_STATUS
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LegacyRegionInit (
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VOID
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)
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{
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EFI_STATUS Status;
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//
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// Install the Legacy Region Protocol on a new handle
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//
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Status = gBS->InstallMultipleProtocolInterfaces (
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&mHandle,
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&gEfiLegacyRegion2ProtocolGuid, &mLegacyRegion2,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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