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https://github.com/CloverHackyColor/CloverBootloader.git
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326 lines
11 KiB
C
326 lines
11 KiB
C
/** @file
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Instance of SMM IO check library.
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SMM IO check library library implementation. This library consumes GCD to collect all valid
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IO space defined by a platform.
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A platform may have its own SmmIoLib instance to exclude more IO space.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiSmm.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/SmmServicesTableLib.h>
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#include <Library/HobLib.h>
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#include <Library/DxeServicesTableLib.h>
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#include <Protocol/SmmReadyToLock.h>
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#include <Protocol/SmmEndOfDxe.h>
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *mSmmIoLibGcdMemSpace = NULL;
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UINTN mSmmIoLibGcdMemNumberOfDesc = 0;
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EFI_PHYSICAL_ADDRESS mSmmIoLibInternalMaximumSupportMemAddress = 0;
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VOID *mSmmIoLibRegistrationEndOfDxe;
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VOID *mSmmIoLibRegistrationReadyToLock;
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BOOLEAN mSmmIoLibReadyToLock = FALSE;
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/**
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Calculate and save the maximum support address.
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**/
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VOID
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SmmIoLibInternalCalculateMaximumSupportAddress (
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VOID
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)
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{
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VOID *Hob;
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UINT32 RegEax;
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UINT8 MemPhysicalAddressBits;
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//
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// Get physical address bits supported.
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//
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Hob = GetFirstHob (EFI_HOB_TYPE_CPU);
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if (Hob != NULL) {
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MemPhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;
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} else {
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AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
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if (RegEax >= 0x80000008) {
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AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
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MemPhysicalAddressBits = (UINT8) RegEax;
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} else {
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MemPhysicalAddressBits = 36;
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}
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}
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//
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// IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.
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//
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ASSERT (MemPhysicalAddressBits <= 52);
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if (MemPhysicalAddressBits > 48) {
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MemPhysicalAddressBits = 48;
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}
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//
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// Save the maximum support address in one global variable
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//
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mSmmIoLibInternalMaximumSupportMemAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, MemPhysicalAddressBits) - 1);
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DEBUG ((DEBUG_INFO, "mSmmIoLibInternalMaximumSupportMemAddress = 0x%lx\n", mSmmIoLibInternalMaximumSupportMemAddress));
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}
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/**
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This function check if the MMIO resource is valid per processor architecture and
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valid per platform design.
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@param BaseAddress The MMIO start address to be checked.
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@param Length The MMIO length to be checked.
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@param Owner A GUID representing the owner of the resource.
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This GUID may be used by producer to correlate the device ownership of the resource.
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NULL means no specific owner.
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@retval TRUE This MMIO resource is valid per processor architecture and valid per platform design.
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@retval FALSE This MMIO resource is not valid per processor architecture or valid per platform design.
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**/
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BOOLEAN
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EFIAPI
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SmmIsMmioValid (
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IN EFI_PHYSICAL_ADDRESS BaseAddress,
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IN UINT64 Length,
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IN EFI_GUID *Owner OPTIONAL
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)
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{
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UINTN Index;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *Desc;
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BOOLEAN InValidRegion;
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//
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// Check override.
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// NOTE: (B:0->L:4G) is invalid for IA32, but (B:1->L:4G-1)/(B:4G-1->L:1) is valid.
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//
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if ((Length > mSmmIoLibInternalMaximumSupportMemAddress) ||
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(BaseAddress > mSmmIoLibInternalMaximumSupportMemAddress) ||
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((Length != 0) && (BaseAddress > (mSmmIoLibInternalMaximumSupportMemAddress - (Length - 1)))) ) {
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//
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// Overflow happen
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//
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DEBUG ((
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DEBUG_ERROR,
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"SmmIsMmioValid: Overflow: BaseAddress (0x%lx) - Length (0x%lx), MaximumSupportMemAddress (0x%lx)\n",
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BaseAddress,
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Length,
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mSmmIoLibInternalMaximumSupportMemAddress
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));
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return FALSE;
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}
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//
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// Check override for valid MMIO region
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//
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if (mSmmIoLibReadyToLock) {
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InValidRegion = FALSE;
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for (Index = 0; Index < mSmmIoLibGcdMemNumberOfDesc; Index ++) {
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Desc = &mSmmIoLibGcdMemSpace[Index];
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if ((Desc->GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo) &&
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(BaseAddress >= Desc->BaseAddress) &&
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((BaseAddress + Length) <= (Desc->BaseAddress + Desc->Length))) {
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InValidRegion = TRUE;
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}
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}
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if (!InValidRegion) {
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DEBUG ((
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DEBUG_ERROR,
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"SmmIsMmioValid: Not in valid MMIO region: BaseAddress (0x%lx) - Length (0x%lx)\n",
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BaseAddress,
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Length
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));
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return FALSE;
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}
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}
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return TRUE;
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}
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/**
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Merge continuous entries whose type is EfiGcdMemoryTypeMemoryMappedIo.
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@param[in, out] GcdMemoryMap A pointer to the buffer in which firmware places
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the current GCD memory map.
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@param[in, out] NumberOfDescriptors A pointer to the number of the
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GcdMemoryMap buffer. On input, this is the number of
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the current GCD memory map. On output,
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it is the number of new GCD memory map after merge.
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**/
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STATIC
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VOID
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MergeGcdMmioEntry (
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IN OUT EFI_GCD_MEMORY_SPACE_DESCRIPTOR *GcdMemoryMap,
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IN OUT UINTN *NumberOfDescriptors
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)
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{
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *GcdMemoryMapEntry;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *GcdMemoryMapEnd;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *NewGcdMemoryMapEntry;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *NextGcdMemoryMapEntry;
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GcdMemoryMapEntry = GcdMemoryMap;
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NewGcdMemoryMapEntry = GcdMemoryMap;
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GcdMemoryMapEnd = (EFI_GCD_MEMORY_SPACE_DESCRIPTOR *) ((UINT8 *) GcdMemoryMap + (*NumberOfDescriptors) * sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR));
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while ((UINTN)GcdMemoryMapEntry < (UINTN)GcdMemoryMapEnd) {
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CopyMem(NewGcdMemoryMapEntry, GcdMemoryMapEntry, sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR));
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NextGcdMemoryMapEntry = GcdMemoryMapEntry + 1;
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do {
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if (((UINTN)NextGcdMemoryMapEntry < (UINTN)GcdMemoryMapEnd) &&
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(GcdMemoryMapEntry->GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo) && (NextGcdMemoryMapEntry->GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo) &&
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((GcdMemoryMapEntry->BaseAddress + GcdMemoryMapEntry->Length) == NextGcdMemoryMapEntry->BaseAddress)) {
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GcdMemoryMapEntry->Length += NextGcdMemoryMapEntry->Length;
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if (NewGcdMemoryMapEntry != GcdMemoryMapEntry) {
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NewGcdMemoryMapEntry->Length += NextGcdMemoryMapEntry->Length;
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}
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NextGcdMemoryMapEntry = NextGcdMemoryMapEntry + 1;
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continue;
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} else {
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GcdMemoryMapEntry = NextGcdMemoryMapEntry - 1;
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break;
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}
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} while (TRUE);
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GcdMemoryMapEntry = GcdMemoryMapEntry + 1;
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NewGcdMemoryMapEntry = NewGcdMemoryMapEntry + 1;
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}
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*NumberOfDescriptors = ((UINTN)NewGcdMemoryMapEntry - (UINTN)GcdMemoryMap) / sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR);
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return ;
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}
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/**
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Notification for SMM EndOfDxe protocol.
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@param[in] Protocol Points to the protocol's unique identifier.
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@param[in] Interface Points to the interface instance.
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@param[in] Handle The handle on which the interface was installed.
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@retval EFI_SUCCESS Notification runs successfully.
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@retval EFI_OUT_OF_RESOURCES No enough resources to save GCD MMIO map.
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**/
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EFI_STATUS
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EFIAPI
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SmmIoLibInternalEndOfDxeNotify (
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IN CONST EFI_GUID *Protocol,
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IN VOID *Interface,
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IN EFI_HANDLE Handle
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)
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{
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UINTN NumberOfDescriptors;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemSpaceMap;
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EFI_STATUS Status;
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Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemSpaceMap);
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if (!EFI_ERROR(Status)) {
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MergeGcdMmioEntry (MemSpaceMap, &NumberOfDescriptors);
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mSmmIoLibGcdMemSpace = AllocateCopyPool(NumberOfDescriptors * sizeof (EFI_GCD_MEMORY_SPACE_DESCRIPTOR), MemSpaceMap);
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ASSERT (mSmmIoLibGcdMemSpace != NULL);
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if (mSmmIoLibGcdMemSpace == NULL) {
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gBS->FreePool(MemSpaceMap);
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return EFI_OUT_OF_RESOURCES;
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}
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mSmmIoLibGcdMemNumberOfDesc = NumberOfDescriptors;
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gBS->FreePool(MemSpaceMap);
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}
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return EFI_SUCCESS;
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}
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/**
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Notification for SMM ReadyToLock protocol.
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@param[in] Protocol Points to the protocol's unique identifier.
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@param[in] Interface Points to the interface instance.
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@param[in] Handle The handle on which the interface was installed.
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@retval EFI_SUCCESS Notification runs successfully.
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**/
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EFI_STATUS
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EFIAPI
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SmmIoLibInternalReadyToLockNotify (
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IN CONST EFI_GUID *Protocol,
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IN VOID *Interface,
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IN EFI_HANDLE Handle
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)
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{
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mSmmIoLibReadyToLock = TRUE;
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return EFI_SUCCESS;
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}
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/**
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The constructor function initializes the Smm IO library
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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SmmIoLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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//
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// Calculate and save maximum support address
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//
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SmmIoLibInternalCalculateMaximumSupportAddress ();
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//
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// Register EndOfDxe to get GCD resource map
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//
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Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, SmmIoLibInternalEndOfDxeNotify, &mSmmIoLibRegistrationEndOfDxe);
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ASSERT_EFI_ERROR(Status);
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//
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// Register ready to lock so that we can know when to check valid resource region
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//
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Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, SmmIoLibInternalReadyToLockNotify, &mSmmIoLibRegistrationReadyToLock);
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ASSERT_EFI_ERROR(Status);
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return EFI_SUCCESS;
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}
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/**
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The destructor function frees resource used in the Smm IO library
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The deconstructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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SmmIoLibDestructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, NULL, &mSmmIoLibRegistrationEndOfDxe);
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gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, NULL, &mSmmIoLibRegistrationReadyToLock);
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return EFI_SUCCESS;
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}
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