mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-10 09:40:53 +01:00
359 lines
12 KiB
C
359 lines
12 KiB
C
/**
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Runtime Services Wrappers.
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by Download-Fritz & vit9696
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**/
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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/OcMiscLib.h>
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#include <Library/UefiLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Guid/OcVariables.h>
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#include "Config.h"
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#include "RtShims.h"
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#include "BootFixes.h"
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#include "MemoryMap.h"
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extern UINTN gRtShimsDataStart;
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extern UINTN gRtShimsDataEnd;
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extern UINTN gGetVariable;
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extern UINTN gGetNextVariableName;
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extern UINTN gSetVariable;
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extern UINTN gGetTime;
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extern UINTN gSetTime;
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extern UINTN gGetWakeupTime;
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extern UINTN gSetWakeupTime;
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extern UINTN gGetNextHighMonoCount;
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extern UINTN gResetSystem;
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extern UINTN gGetVariableOverride;
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extern UINTN gRequiresWriteUnprotect;
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extern UINTN gBootVariableRedirect;
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extern EFI_GUID gReadOnlyVariableGuid;
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extern EFI_GUID gWriteOnlyVariableGuid;
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extern EFI_GUID gBootVariableGuid;
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extern EFI_GUID gRedirectVariableGuid;
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extern UINTN RtShimGetVariable;
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extern UINTN RtShimGetNextVariableName;
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extern UINTN RtShimSetVariable;
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extern UINTN RtShimGetTime;
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extern UINTN RtShimSetTime;
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extern UINTN RtShimGetWakeupTime;
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extern UINTN RtShimSetWakeupTime;
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extern UINTN RtShimGetNextHighMonoCount;
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extern UINTN RtShimResetSystem;
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VOID *gRtShims = NULL;
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STATIC BOOLEAN mRtShimsAddrUpdated = FALSE;
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STATIC RT_SHIM_PTRS mShimPtrArray[] = {
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{ &gGetVariable },
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{ &gSetVariable },
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{ &gGetNextVariableName },
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{ &gGetTime },
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{ &gSetTime },
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{ &gGetWakeupTime },
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{ &gSetWakeupTime },
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{ &gGetNextHighMonoCount },
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{ &gResetSystem }
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};
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STATIC RT_RELOC_PROTECT_DATA mRelocInfoData;
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VOID InstallRtShims (
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EFI_GET_VARIABLE GetVariableOverride
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)
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{
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EFI_STATUS Status;
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UINTN PageCount;
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EFI_PHYSICAL_ADDRESS RtShims = BASE_4GB;
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//
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// Support read-only and write-only variables from runtime-services.
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//
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CopyGuid (&gReadOnlyVariableGuid, &gOcReadOnlyVariableGuid);
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CopyGuid (&gWriteOnlyVariableGuid, &gOcWriteOnlyVariableGuid);
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CopyGuid (&gBootVariableGuid, &gEfiGlobalVariableGuid);
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CopyGuid (&gRedirectVariableGuid, &gOcVendorVariableGuid);
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if (gHasBrokenS4Allocator) {
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//
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// Some firmwares appear to allocate rt shims at randomly incomprehensible area.
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// This unfortunately results in crashes and using pool allocs is one of the workarounds.
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//
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Status = gBS->AllocatePool (
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EfiRuntimeServicesCode,
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((UINTN)&gRtShimsDataEnd - (UINTN)&gRtShimsDataStart),
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&gRtShims
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);
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} else {
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//
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// It is important to allocate properly from top on saner firmwares.
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// If we do not and use hacks like above many other operating systems (like Linux)
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// may stop loading.
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//
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PageCount = EFI_SIZE_TO_PAGES ((UINTN)&gRtShimsDataEnd - (UINTN)&gRtShimsDataStart);
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Status = AllocatePagesFromTop (
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EfiRuntimeServicesCode,
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PageCount,
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&RtShims,
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FALSE
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);
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if (!EFI_ERROR(Status)) {
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gRtShims = (VOID *)(UINTN)RtShims;
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}
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}
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if (!EFI_ERROR(Status)) {
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gGetVariable = (UINTN)gRT->GetVariable;
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gSetVariable = (UINTN)gRT->SetVariable;
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gGetNextVariableName = (UINTN)gRT->GetNextVariableName;
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gGetTime = (UINTN)gRT->GetTime;
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gSetTime = (UINTN)gRT->SetTime;
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gGetWakeupTime = (UINTN)gRT->GetWakeupTime;
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gSetWakeupTime = (UINTN)gRT->SetWakeupTime;
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gGetNextHighMonoCount = (UINTN)gRT->GetNextHighMonotonicCount;
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gResetSystem = (UINTN)gRT->ResetSystem;
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gGetVariableOverride = (UINTN)GetVariableOverride;
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CopyMem(
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gRtShims,
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(VOID *)&gRtShimsDataStart,
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((UINTN)&gRtShimsDataEnd - (UINTN)&gRtShimsDataStart)
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);
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gRT->GetVariable = (EFI_GET_VARIABLE)((UINTN)gRtShims + ((UINTN)&RtShimGetVariable - (UINTN)&gRtShimsDataStart));
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gRT->SetVariable = (EFI_SET_VARIABLE)((UINTN)gRtShims + ((UINTN)&RtShimSetVariable - (UINTN)&gRtShimsDataStart));
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gRT->GetNextVariableName = (EFI_GET_NEXT_VARIABLE_NAME)((UINTN)gRtShims + ((UINTN)&RtShimGetNextVariableName - (UINTN)&gRtShimsDataStart));
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gRT->GetTime = (EFI_GET_TIME)((UINTN)gRtShims + ((UINTN)&RtShimGetTime - (UINTN)&gRtShimsDataStart));
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gRT->SetTime = (EFI_SET_TIME)((UINTN)gRtShims + ((UINTN)&RtShimSetTime - (UINTN)&gRtShimsDataStart));
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gRT->GetWakeupTime = (EFI_GET_WAKEUP_TIME)((UINTN)gRtShims + ((UINTN)&RtShimGetWakeupTime - (UINTN)&gRtShimsDataStart));
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gRT->SetWakeupTime = (EFI_SET_WAKEUP_TIME)((UINTN)gRtShims + ((UINTN)&RtShimSetWakeupTime - (UINTN)&gRtShimsDataStart));
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gRT->GetNextHighMonotonicCount = (EFI_GET_NEXT_HIGH_MONO_COUNT)((UINTN)gRtShims + ((UINTN)&RtShimGetNextHighMonoCount - (UINTN)&gRtShimsDataStart));
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gRT->ResetSystem = (EFI_RESET_SYSTEM)((UINTN)gRtShims + ((UINTN)&RtShimResetSystem - (UINTN)&gRtShimsDataStart));
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gRT->Hdr.CRC32 = 0;
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gBS->CalculateCrc32(gRT, gRT->Hdr.HeaderSize, &gRT->Hdr.CRC32);
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} else {
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DEBUG ((DEBUG_VERBOSE, "Nulling RtShims\n"));
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gRtShims = NULL;
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}
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}
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VOID
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VirtualizeRtShims (
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UINTN MemoryMapSize,
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UINTN DescriptorSize,
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EFI_MEMORY_DESCRIPTOR *MemoryMap
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)
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{
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EFI_MEMORY_DESCRIPTOR *Desc;
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UINTN Index, Index2, FixedCount = 0;
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//
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// For some reason creating an event for catching SetVirtualAddress doesn't work on APTIO IV Z77,
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// So we cannot use a dedicated ConvertPointer function and have to implement everything manually.
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//
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//
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// Are we already done?
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//
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if (mRtShimsAddrUpdated)
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return;
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Desc = MemoryMap;
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//
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// Custom GetVariable wrapper is no longer allowed!
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//
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*(UINTN *)((UINTN)gRtShims + ((UINTN)&gGetVariableOverride - (UINTN)&gRtShimsDataStart)) = 0;
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for (Index = 0; Index < ARRAY_SIZE (mShimPtrArray); ++Index) {
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mShimPtrArray[Index].Func = (UINTN *)((UINTN)gRtShims + ((UINTN)(mShimPtrArray[Index].gFunc) - (UINTN)&gRtShimsDataStart));
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}
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for (Index = 0; Index < (MemoryMapSize / DescriptorSize); ++Index) {
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for (Index2 = 0; Index2 < ARRAY_SIZE (mShimPtrArray); ++Index2) {
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if (
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!mShimPtrArray[Index2].Fixed &&
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(*(mShimPtrArray[Index2].gFunc) >= Desc->PhysicalStart) &&
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(*(mShimPtrArray[Index2].gFunc) < (Desc->PhysicalStart + EFI_PAGES_TO_SIZE (Desc->NumberOfPages)))
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) {
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mShimPtrArray[Index2].Fixed = TRUE;
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*(mShimPtrArray[Index2].Func) += (Desc->VirtualStart - Desc->PhysicalStart);
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FixedCount++;
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}
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}
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if (FixedCount == ARRAY_SIZE (mShimPtrArray)) {
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break;
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}
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Desc = NEXT_MEMORY_DESCRIPTOR (Desc, DescriptorSize);
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}
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mRtShimsAddrUpdated = TRUE;
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}
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EFI_STATUS
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EFIAPI
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OrgGetVariable (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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OUT UINT32 *Attributes OPTIONAL,
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IN OUT UINTN *DataSize,
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OUT VOID *Data
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)
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{
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return (gGetVariable ? (EFI_GET_VARIABLE)gGetVariable : gRT->GetVariable) (
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VariableName,
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VendorGuid,
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Attributes,
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DataSize,
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Data
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);
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}
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/** Protect RT data from relocation by marking them MemMapIO. Except area with EFI system table.
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* This one must be relocated into kernel boot image or kernel will crash (kernel accesses it
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* before RT areas are mapped into vm).
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* This fixes NVRAM issues on some boards where access to nvram after boot services is possible
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* only in SMM mode. RT driver passes data to SM handler through previously negotiated buffer
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* and this buffer must not be relocated.
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* Explained and examined in detail by CodeRush and night199uk:
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* http://www.projectosx.com/forum/index.php?showtopic=3298
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*
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* It seems this does not do any harm to others where this is not needed,
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* so it's added as standard fix for all.
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*
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* Starting with APTIO V for nvram to work not only data but could too can no longer be moved
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* due to the use of commbuffers. This, however, creates a memory protection issue, because
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* XNU maps RT data as RW and code as RX, and AMI appears use global variables in some RT drivers.
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* For this reason we shim (most?) affected RT services via wrapers that unset the WP bit during
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* the UEFI call and set it back on return.
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* Explained in detail by Download-Fritz and vit9696:
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* http://www.insanelymac.com/forum/topic/331381-aptiomemoryfix (first 2 links in particular).
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*/
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VOID
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ProtectRtMemoryFromRelocation (
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IN UINTN MemoryMapSize,
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IN UINTN DescriptorSize,
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IN UINT32 DescriptorVersion,
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IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,
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IN EFI_PHYSICAL_ADDRESS SysTableArea
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)
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{
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UINTN NumEntries;
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UINTN Index;
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EFI_MEMORY_DESCRIPTOR *Desc;
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RT_RELOC_PROTECT_INFO *RelocInfo;
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Desc = MemoryMap;
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NumEntries = MemoryMapSize / DescriptorSize;
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mRelocInfoData.NumEntries = 0;
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RelocInfo = &mRelocInfoData.RelocInfo[0];
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for (Index = 0; Index < NumEntries; Index++) {
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if ((Desc->Attribute & EFI_MEMORY_RUNTIME) != 0 &&
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(Desc->Type == EfiRuntimeServicesCode ||
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(Desc->Type == EfiRuntimeServicesData && Desc->PhysicalStart != SysTableArea))) {
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if (mRelocInfoData.NumEntries < ARRAY_SIZE (mRelocInfoData.RelocInfo)) {
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RelocInfo->PhysicalStart = Desc->PhysicalStart;
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RelocInfo->Type = Desc->Type;
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++RelocInfo;
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++mRelocInfoData.NumEntries;
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} else {
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DEBUG ((DEBUG_INFO, "WARNING: Cannot save mem type for entry: %lx (type 0x%x)\n", Desc->PhysicalStart, (UINTN)Desc->Type));
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}
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DEBUG ((DEBUG_VERBOSE, "RT mem %lx (0x%x) -> MemMapIO\n", Desc->PhysicalStart, Desc->NumberOfPages));
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Desc->Type = EfiMemoryMappedIO;
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}
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Desc = NEXT_MEMORY_DESCRIPTOR (Desc, DescriptorSize);
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}
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}
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VOID
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RestoreProtectedRtMemoryTypes (
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IN UINTN MemoryMapSize,
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IN UINTN DescriptorSize,
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IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap
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)
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{
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UINTN Index;
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UINTN Index2;
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UINTN NumEntriesLeft;
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NumEntriesLeft = mRelocInfoData.NumEntries;
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if (NumEntriesLeft > 0) {
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for (Index = 0; Index < (MemoryMapSize / DescriptorSize); ++Index) {
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if (NumEntriesLeft > 0) {
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for (Index2 = 0; Index2 < mRelocInfoData.NumEntries; ++Index2) {
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if (MemoryMap->PhysicalStart == mRelocInfoData.RelocInfo[Index2].PhysicalStart) {
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MemoryMap->Type = mRelocInfoData.RelocInfo[Index2].Type;
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--NumEntriesLeft;
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}
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}
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}
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MemoryMap = NEXT_MEMORY_DESCRIPTOR (MemoryMap, DescriptorSize);
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}
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}
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}
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VOID
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SetWriteUnprotectorMode (
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IN BOOLEAN Enable
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)
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{
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*(UINTN *)((UINTN)gRtShims + ((UINTN)&gRequiresWriteUnprotect - (UINTN)&gRtShimsDataStart)) = Enable;
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}
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BOOLEAN
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EFIAPI
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SetBootVariableRedirect (
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IN BOOLEAN Enable
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)
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{
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UINTN DataSize;
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EFI_STATUS Status;
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BOOLEAN Previous;
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if (Enable) {
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DataSize = sizeof (Enable);
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Status = gRT->GetVariable (
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OC_BOOT_REDIRECT_VARIABLE_NAME,
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&gOcVendorVariableGuid,
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NULL,
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&DataSize,
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&Enable
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);
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if (EFI_ERROR(Status)) {
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Enable = FALSE;
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}
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}
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Previous = *(BOOLEAN *)((UINTN)gRtShims + ((UINTN)&gBootVariableRedirect - (UINTN)&gRtShimsDataStart));
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*(BOOLEAN *)((UINTN)gRtShims + ((UINTN)&gBootVariableRedirect - (UINTN)&gRtShimsDataStart)) = Enable;
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return Previous;
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}
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