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https://github.com/CloverHackyColor/CloverBootloader.git
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368 lines
11 KiB
C
368 lines
11 KiB
C
/** @file
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IA32/x64 generic functions to support Debug Support protocol.
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Copyright (c) 2006 - 2018, 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 "DebugSupport.h"
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//
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// This the global main table to keep track of the interrupts
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//
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IDT_ENTRY *IdtEntryTable = NULL;
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/**
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Read IDT Gate Descriptor from IDT Table.
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@param Vector Specifies vector number.
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@param IdtGateDescriptor Pointer to IDT Gate Descriptor read from IDT Table.
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**/
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VOID
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ReadIdtGateDescriptor (
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IN EFI_EXCEPTION_TYPE Vector,
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OUT IA32_IDT_GATE_DESCRIPTOR *IdtGateDescriptor
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)
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{
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IA32_DESCRIPTOR IdtrValue;
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IA32_IDT_GATE_DESCRIPTOR *IdtTable;
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AsmReadIdtr (&IdtrValue);
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IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtrValue.Base;
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CopyMem((VOID *) IdtGateDescriptor, (VOID *) &(IdtTable)[Vector], sizeof (IA32_IDT_GATE_DESCRIPTOR));
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}
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/**
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Write IDT Gate Descriptor into IDT Table.
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@param Vector Specifies vector number.
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@param IdtGateDescriptor Pointer to IDT Gate Descriptor written into IDT Table.
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**/
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VOID
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WriteIdtGateDescriptor (
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EFI_EXCEPTION_TYPE Vector,
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IA32_IDT_GATE_DESCRIPTOR *IdtGateDescriptor
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)
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{
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IA32_DESCRIPTOR IdtrValue;
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IA32_IDT_GATE_DESCRIPTOR *IdtTable;
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AsmReadIdtr (&IdtrValue);
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IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtrValue.Base;
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CopyMem((VOID *) &(IdtTable)[Vector], (VOID *) IdtGateDescriptor, sizeof (IA32_IDT_GATE_DESCRIPTOR));
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}
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/**
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Creates a nes entry stub. Then saves the current IDT entry and replaces it
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with an interrupt gate for the new entry point. The IdtEntryTable is updated
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with the new registered function.
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This code executes in boot services context. The stub entry executes in interrupt
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context.
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@param ExceptionType Specifies which vector to hook.
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@param NewCallback A pointer to the new function to be registered.
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**/
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VOID
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HookEntry (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN CALLBACK_FUNC NewCallback
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)
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{
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BOOLEAN OldIntFlagState;
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CreateEntryStub (ExceptionType, (VOID **) &IdtEntryTable[ExceptionType].StubEntry);
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//
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// Disables CPU interrupts and returns the previous interrupt state
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//
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OldIntFlagState = SaveAndDisableInterrupts ();
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//
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// gets IDT Gate descriptor by index
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//
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ReadIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));
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//
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// stores orignal interrupt handle
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//
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IdtEntryTable[ExceptionType].OrigVector = (DEBUG_PROC) GetInterruptHandleFromIdt (&(IdtEntryTable[ExceptionType].OrigDesc));
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//
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// encodes new IDT Gate descriptor by stub entry
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//
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Vect2Desc (&IdtEntryTable[ExceptionType].NewDesc, IdtEntryTable[ExceptionType].StubEntry);
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//
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// stores NewCallback
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//
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IdtEntryTable[ExceptionType].RegisteredCallback = NewCallback;
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//
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// writes back new IDT Gate descriptor
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//
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WriteIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].NewDesc));
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//
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// restore interrupt state
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//
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SetInterruptState (OldIntFlagState);
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return ;
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}
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/**
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Undoes HookEntry. This code executes in boot services context.
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@param ExceptionType Specifies which entry to unhook
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**/
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VOID
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UnhookEntry (
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IN EFI_EXCEPTION_TYPE ExceptionType
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)
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{
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BOOLEAN OldIntFlagState;
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//
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// Disables CPU interrupts and returns the previous interrupt state
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//
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OldIntFlagState = SaveAndDisableInterrupts ();
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//
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// restore the default IDT Date Descriptor
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//
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WriteIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));
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//
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// restore interrupt state
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//
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SetInterruptState (OldIntFlagState);
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return ;
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}
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/**
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Returns the maximum value that may be used for the ProcessorIndex parameter in
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RegisterPeriodicCallback() and RegisterExceptionCallback().
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Hard coded to support only 1 processor for now.
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@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.
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@param MaxProcessorIndex Pointer to a caller-allocated UINTN in which the maximum supported
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processor index is returned. Always 0 returned.
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@retval EFI_SUCCESS Always returned with **MaxProcessorIndex set to 0.
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**/
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EFI_STATUS
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EFIAPI
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GetMaximumProcessorIndex (
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IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
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OUT UINTN *MaxProcessorIndex
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)
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{
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*MaxProcessorIndex = 0;
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return EFI_SUCCESS;
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}
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/**
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Registers a function to be called back periodically in interrupt context.
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@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.
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@param ProcessorIndex Specifies which processor the callback function applies to.
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@param PeriodicCallback A pointer to a function of type PERIODIC_CALLBACK that is the main
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periodic entry point of the debug agent.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a callback
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function was previously registered.
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@retval EFI_OUT_OF_RESOURCES System has insufficient memory resources to register new callback
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function.
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**/
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EFI_STATUS
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EFIAPI
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RegisterPeriodicCallback (
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IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
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IN UINTN ProcessorIndex,
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IN EFI_PERIODIC_CALLBACK PeriodicCallback
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)
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{
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return ManageIdtEntryTable (PeriodicCallback, SYSTEM_TIMER_VECTOR);
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}
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/**
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Registers a function to be called when a given processor exception occurs.
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This code executes in boot services context.
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@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.
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@param ProcessorIndex Specifies which processor the callback function applies to.
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@param ExceptionCallback A pointer to a function of type EXCEPTION_CALLBACK that is called
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when the processor exception specified by ExceptionType occurs.
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@param ExceptionType Specifies which processor exception to hook.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a callback
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function was previously registered.
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@retval EFI_OUT_OF_RESOURCES System has insufficient memory resources to register new callback
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function.
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**/
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EFI_STATUS
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EFIAPI
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RegisterExceptionCallback (
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IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
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IN UINTN ProcessorIndex,
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IN EFI_EXCEPTION_CALLBACK ExceptionCallback,
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IN EFI_EXCEPTION_TYPE ExceptionType
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)
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{
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return ManageIdtEntryTable (ExceptionCallback, ExceptionType);
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}
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/**
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Invalidates processor instruction cache for a memory range. Subsequent execution in this range
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causes a fresh memory fetch to retrieve code to be executed.
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@param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.
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@param ProcessorIndex Specifies which processor's instruction cache is to be invalidated.
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@param Start Specifies the physical base of the memory range to be invalidated.
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@param Length Specifies the minimum number of bytes in the processor's instruction
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cache to invalidate.
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@retval EFI_SUCCESS Always returned.
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**/
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EFI_STATUS
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EFIAPI
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InvalidateInstructionCache (
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IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
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IN UINTN ProcessorIndex,
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IN VOID *Start,
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IN UINT64 Length
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)
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{
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AsmWbinvd ();
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return EFI_SUCCESS;
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}
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/**
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Common piece of code that invokes the registered handlers.
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This code executes in exception context so no efi calls are allowed.
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This code is called from assembly file.
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@param ExceptionType Exception type
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@param ContextRecord System context
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**/
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VOID
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InterruptDistrubutionHub (
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EFI_EXCEPTION_TYPE ExceptionType,
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EFI_SYSTEM_CONTEXT_IA32 *ContextRecord
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)
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{
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if (IdtEntryTable[ExceptionType].RegisteredCallback != NULL) {
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if (ExceptionType != SYSTEM_TIMER_VECTOR) {
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IdtEntryTable[ExceptionType].RegisteredCallback (ExceptionType, ContextRecord);
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} else {
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OrigVector = IdtEntryTable[ExceptionType].OrigVector;
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IdtEntryTable[ExceptionType].RegisteredCallback (ContextRecord);
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}
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}
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}
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/**
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This is the callback that is written to the Loaded Image protocol instance
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on the image handle. It uninstalls all registered handlers and frees all entry
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stub memory.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@retval EFI_SUCCESS Always.
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**/
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EFI_STATUS
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EFIAPI
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PlUnloadDebugSupportDriver (
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IN EFI_HANDLE ImageHandle
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)
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{
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EFI_EXCEPTION_TYPE ExceptionType;
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for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {
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ManageIdtEntryTable (NULL, ExceptionType);
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//
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// Free space for each Interrupt Stub precedure.
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//
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if (IdtEntryTable[ExceptionType].StubEntry != NULL) {
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FreePool((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);
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}
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}
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FreePool(IdtEntryTable);
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return EFI_SUCCESS;
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}
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/**
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Initializes driver's handler registration database.
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This code executes in boot services context.
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Must be public because it's referenced from DebugSupport.c
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@retval EFI_UNSUPPORTED If IA32/x64 processor does not support FXSTOR/FXRSTOR instructions,
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the context save will fail, so these processors are not supported.
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@retval EFI_OUT_OF_RESOURCES Fails to allocate memory.
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@retval EFI_SUCCESS Initializes successfully.
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**/
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EFI_STATUS
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PlInitializeDebugSupportDriver (
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VOID
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)
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{
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EFI_EXCEPTION_TYPE ExceptionType;
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//
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// Check whether FxStor instructions are supported.
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//
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if (!FxStorSupport ()) {
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return EFI_UNSUPPORTED;
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}
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IdtEntryTable = AllocateZeroPool(sizeof (IDT_ENTRY) * NUM_IDT_ENTRIES);
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if (IdtEntryTable == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType ++) {
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IdtEntryTable[ExceptionType].StubEntry = (DEBUG_PROC) (UINTN) AllocatePool (StubSize);
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if (IdtEntryTable[ExceptionType].StubEntry == NULL) {
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goto ErrorCleanup;
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}
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//
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// Copy Interrupt stub code.
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//
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CopyMem((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry, InterruptEntryStub, StubSize);
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}
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return EFI_SUCCESS;
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ErrorCleanup:
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for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {
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if (IdtEntryTable[ExceptionType].StubEntry != NULL) {
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FreePool((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);
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}
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}
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FreePool(IdtEntryTable);
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return EFI_OUT_OF_RESOURCES;
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}
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