mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-28 17:08:18 +01:00
141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/** @file
|
|
X64 specific functions to support Debug Support protocol.
|
|
|
|
Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include "PlDebugSupport.h"
|
|
|
|
IA32_IDT_GATE_DESCRIPTOR NullDesc = {{0,0}};
|
|
|
|
/**
|
|
Get Interrupt Handle from IDT Gate Descriptor.
|
|
|
|
@param IdtGateDecriptor IDT Gate Descriptor.
|
|
|
|
@return Interrupt Handle stored in IDT Gate Descriptor.
|
|
|
|
**/
|
|
UINTN
|
|
GetInterruptHandleFromIdt (
|
|
IN IA32_IDT_GATE_DESCRIPTOR *IdtGateDecriptor
|
|
)
|
|
{
|
|
UINTN InterruptHandle;
|
|
|
|
//
|
|
// InterruptHandle 0-15 : OffsetLow
|
|
// InterruptHandle 16-31 : OffsetHigh
|
|
// InterruptHandle 32-63 : OffsetUpper
|
|
//
|
|
InterruptHandle = ((UINTN) IdtGateDecriptor->Bits.OffsetLow) |
|
|
(((UINTN) IdtGateDecriptor->Bits.OffsetHigh) << 16) |
|
|
(((UINTN) IdtGateDecriptor->Bits.OffsetUpper) << 32) ;
|
|
|
|
return InterruptHandle;
|
|
}
|
|
|
|
/**
|
|
Allocate pool for a new IDT entry stub.
|
|
|
|
Copy the generic stub into the new buffer and fixup the vector number
|
|
and jump target address.
|
|
|
|
@param ExceptionType This is the exception type that the new stub will be created
|
|
for.
|
|
@param Stub On successful exit, *Stub contains the newly allocated entry stub.
|
|
|
|
**/
|
|
VOID
|
|
CreateEntryStub (
|
|
IN EFI_EXCEPTION_TYPE ExceptionType,
|
|
OUT VOID **Stub
|
|
)
|
|
{
|
|
UINT8 *StubCopy;
|
|
|
|
StubCopy = *Stub;
|
|
|
|
//
|
|
// Fixup the stub code for this vector
|
|
//
|
|
|
|
// The stub code looks like this:
|
|
//
|
|
// 00000000 6A 00 push 0 ; push vector number - will be modified before installed
|
|
// 00000002 E9 db 0e9h ; jump rel32
|
|
// 00000003 00000000 dd 0 ; fixed up to relative address of CommonIdtEntry
|
|
//
|
|
|
|
//
|
|
// poke in the exception type so the second push pushes the exception type
|
|
//
|
|
StubCopy[0x1] = (UINT8) ExceptionType;
|
|
|
|
//
|
|
// fixup the jump target to point to the common entry
|
|
//
|
|
*(UINT32 *) &StubCopy[0x3] = (UINT32)((UINTN) CommonIdtEntry - (UINTN) &StubCopy[StubSize]);
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
This is the main worker function that manages the state of the interrupt
|
|
handlers. It both installs and uninstalls interrupt handlers based on the
|
|
value of NewCallback. If NewCallback is NULL, then uninstall is indicated.
|
|
If NewCallback is non-NULL, then install is indicated.
|
|
|
|
@param NewCallback If non-NULL, NewCallback specifies the new handler to register.
|
|
If NULL, specifies that the previously registered handler should
|
|
be uninstalled.
|
|
@param ExceptionType Indicates which entry to manage.
|
|
|
|
@retval EFI_SUCCESS Process is ok.
|
|
@retval EFI_INVALID_PARAMETER Requested uninstalling a handler from a vector that has
|
|
no handler registered for it
|
|
@retval EFI_ALREADY_STARTED Requested install to a vector that already has a handler registered.
|
|
@retval others Possible return values are passed through from UnHookEntry and HookEntry.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
ManageIdtEntryTable (
|
|
CALLBACK_FUNC NewCallback,
|
|
EFI_EXCEPTION_TYPE ExceptionType
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
|
|
Status = EFI_SUCCESS;
|
|
|
|
if (CompareMem (&IdtEntryTable[ExceptionType].NewDesc, &NullDesc, sizeof (IA32_IDT_GATE_DESCRIPTOR)) != 0) {
|
|
//
|
|
// we've already installed to this vector
|
|
//
|
|
if (NewCallback != NULL) {
|
|
//
|
|
// if the input handler is non-null, error
|
|
//
|
|
Status = EFI_ALREADY_STARTED;
|
|
} else {
|
|
UnhookEntry (ExceptionType);
|
|
}
|
|
} else {
|
|
//
|
|
// no user handler installed on this vector
|
|
//
|
|
if (NewCallback == NULL) {
|
|
//
|
|
// if the input handler is null, error
|
|
//
|
|
Status = EFI_INVALID_PARAMETER;
|
|
} else {
|
|
HookEntry (ExceptionType, NewCallback);
|
|
}
|
|
}
|
|
|
|
return Status;
|
|
}
|