mirror of https://github.com/acidanthera/audk.git
626 lines
15 KiB
C
626 lines
15 KiB
C
/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are 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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Module Name:
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PlDebugSupport.c
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Abstract:
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IPF specific debug support functions
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Revision History
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--*/
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//
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// Master EFI header file
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//
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#include "Tiano.h"
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//
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// Common library header files
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//
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#include "EfiDriverLib.h"
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//
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// Produced protocols
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//
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#include EFI_PROTOCOL_DEFINITION (DebugSupport)
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//
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// private header files
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//
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#include "plDebugSupport.h"
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typedef struct {
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UINT64 low;
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UINT64 high;
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} BUNDLE;
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//
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// number of bundles to swap in ivt
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//
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#define NUM_BUNDLES_IN_STUB 5
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#define NUM_IVT_ENTRIES 64
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typedef struct {
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BUNDLE OrigBundles[NUM_BUNDLES_IN_STUB];
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VOID (*RegisteredCallback) ();
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} IVT_ENTRY;
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STATIC
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EFI_STATUS
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ManageIvtEntryTable (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[4],
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IN VOID (*NewCallback) ()
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);
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STATIC
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VOID
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HookEntry (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[4],
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IN VOID (*NewCallback) ()
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);
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STATIC
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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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STATIC
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VOID
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ChainExternalInterrupt (
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IN VOID (*NewCallback) ()
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);
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STATIC
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VOID
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UnchainExternalInterrupt (
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VOID
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);
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STATIC
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VOID
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GetHandlerEntryPoint (
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UINTN HandlerIndex,
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VOID **EntryPoint
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);
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IVT_ENTRY IvtEntryTable[NUM_IVT_ENTRIES];
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//
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// IPF context record is overallocated by 512 bytes to guarantee a 512 byte alignment exists
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// within the buffer and still have a large enough buffer to hold a whole IPF context record.
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//
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UINT8 IpfContextBuf[sizeof (EFI_SYSTEM_CONTEXT_IPF) + 512];
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//
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// The PatchSaveBuffer is used to store the original bundles from the IVT where it is patched
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// with the common handler.
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//
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UINT8 PatchSaveBuffer[0x400];
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UINTN ExternalInterruptCount;
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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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Routine Description:
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IPF specific DebugSupport driver initialization. Must be public because it's
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referenced from DebugSupport.c
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Arguments:
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Returns:
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EFI_SUCCESS
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--*/
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{
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gBS->SetMem (IvtEntryTable, sizeof (IvtEntryTable), 0);
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ExternalInterruptCount = 0;
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return EFI_SUCCESS;
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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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Routine Description:
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Unload handler that is called during UnloadImage() - deallocates pool memory
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used by the driver. Must be public because it's referenced from DebugSuport.c
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Arguments:
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IN EFI_HANDLE ImageHandle
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Returns:
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EFI_STATUS - anything other than EFI_SUCCESS indicates the callback was not registered.
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--*/
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// TODO: ImageHandle - add argument and description to function comment
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{
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EFI_EXCEPTION_TYPE ExceptionType;
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for (ExceptionType = 0; ExceptionType < NUM_IVT_ENTRIES; ExceptionType++) {
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ManageIvtEntryTable (ExceptionType, NULL, NULL);
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}
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return EFI_SUCCESS;
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}
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VOID
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CommonHandler (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN EFI_SYSTEM_CONTEXT Context
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)
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/*++
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Routine Description:
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C routine that is called for all registered exceptions. This is the main
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exception dispatcher. Must be public because it's referenced from AsmFuncs.s.
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Arguments:
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN EFI_SYSTEM_CONTEXT Context
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Returns:
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Nothing
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--*/
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// TODO: ExceptionType - add argument and description to function comment
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// TODO: Context - add argument and description to function comment
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{
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static BOOLEAN InHandler = FALSE;
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DEBUG_CODE (
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if (InHandler) {
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EfiDebugPrint (EFI_D_GENERIC, "ERROR: Re-entered debugger!\n"
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" ExceptionType == %X\n"
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" Context == %X\n"
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" Context.SystemContextIpf->CrIip == %X\n"
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" Context.SystemContextIpf->CrIpsr == %X\n"
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" InHandler == %X\n",
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ExceptionType,
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Context,
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Context.SystemContextIpf->CrIip,
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Context.SystemContextIpf->CrIpsr,
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InHandler);
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}
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)
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ASSERT (!InHandler);
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InHandler = TRUE;
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if (IvtEntryTable[ExceptionType].RegisteredCallback != NULL) {
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if (ExceptionType != EXCEPT_IPF_EXTERNAL_INTERRUPT) {
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IvtEntryTable[ExceptionType].RegisteredCallback (ExceptionType, Context.SystemContextIpf);
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} else {
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IvtEntryTable[ExceptionType].RegisteredCallback (Context.SystemContextIpf);
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}
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} else {
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ASSERT (0);
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}
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InHandler = FALSE;
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}
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STATIC
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VOID
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GetHandlerEntryPoint (
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UINTN HandlerIndex,
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VOID **EntryPoint
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)
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/*++
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Routine Description:
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Given an integer number, return the physical address of the entry point in the IFT
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Arguments:
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UINTN HandlerIndex,
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VOID ** EntryPoint
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Returns:
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Nothing
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--*/
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// TODO: HandlerIndex - add argument and description to function comment
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// TODO: EntryPoint - add argument and description to function comment
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{
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UINT8 *TempPtr;
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//
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// get base address of IVT
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//
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TempPtr = GetIva ();
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if (HandlerIndex < 20) {
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//
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// first 20 provide 64 bundles per vector
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//
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TempPtr += 0x400 * HandlerIndex;
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} else {
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//
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// the rest provide 16 bundles per vector
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//
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TempPtr += 0x5000 + 0x100 * (HandlerIndex - 20);
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}
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*EntryPoint = (VOID *) TempPtr;
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}
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STATIC
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EFI_STATUS
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ManageIvtEntryTable (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[NUM_BUNDLES_IN_STUB],
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IN VOID (*NewCallback) ()
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)
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/*++
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Routine Description:
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This is the worker function that installs and removes all handlers
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Arguments:
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[NUM_BUNDLES_IN_STUB],
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IN VOID (*NewCallback) ()
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Returns:
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EFI_STATUS - any return other than EFI_SUCCESS indicates the request was not
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satisfied.
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--*/
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// TODO: ExceptionType - add argument and description to function comment
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// TODO: ] - add argument and description to function comment
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// TODO: ) - add argument and description to function comment
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// TODO: EFI_ALREADY_STARTED - add return value to function comment
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{
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BUNDLE *B0Ptr;
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UINT64 InterruptFlags;
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EFI_TPL OldTpl;
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//
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// Get address of bundle 0
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//
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GetHandlerEntryPoint (ExceptionType, (VOID **) &B0Ptr);
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if (IvtEntryTable[ExceptionType].RegisteredCallback != NULL) {
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//
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// we've already installed to this vector
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//
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if (NewCallback != NULL) {
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//
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// if the input handler is non-null, error
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//
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return EFI_ALREADY_STARTED;
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} else {
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//
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// else remove the previously installed handler
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//
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OldTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);
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InterruptFlags = ProgramInterruptFlags (DISABLE_INTERRUPTS);
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if (ExceptionType == EXCEPT_IPF_EXTERNAL_INTERRUPT) {
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UnchainExternalInterrupt ();
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} else {
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UnhookEntry (ExceptionType);
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}
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ProgramInterruptFlags (InterruptFlags);
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gBS->RestoreTPL (OldTpl);
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//
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// re-init IvtEntryTable
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//
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gBS->SetMem (&IvtEntryTable[ExceptionType], sizeof (IVT_ENTRY), 0);
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}
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} else {
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//
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// no user handler installed on this vector
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//
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if (NewCallback != NULL) {
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OldTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);
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InterruptFlags = ProgramInterruptFlags (DISABLE_INTERRUPTS);
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if (ExceptionType == EXCEPT_IPF_EXTERNAL_INTERRUPT) {
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ChainExternalInterrupt (NewCallback);
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} else {
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HookEntry (ExceptionType, NewBundles, NewCallback);
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}
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ProgramInterruptFlags (InterruptFlags);
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gBS->RestoreTPL (OldTpl);
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}
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}
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return EFI_SUCCESS;
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}
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STATIC
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VOID
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HookEntry (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[4],
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IN VOID (*NewCallback) ()
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)
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/*++
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Routine Description:
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Saves original IVT contents and inserts a few new bundles which are fixed up
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to store the ExceptionType and then call the common handler.
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Arguments:
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN BUNDLE NewBundles[4],
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IN VOID (*NewCallback) ()
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Returns:
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Nothing
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--*/
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// TODO: ExceptionType - add argument and description to function comment
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// TODO: ] - add argument and description to function comment
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// TODO: ) - add argument and description to function comment
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{
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BUNDLE *FixupBundle;
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BUNDLE *B0Ptr;
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//
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// Get address of bundle 0
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//
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GetHandlerEntryPoint (ExceptionType, (VOID **) &B0Ptr);
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//
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// copy original bundles from IVT to IvtEntryTable so we can restore them later
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//
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gBS->CopyMem (
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IvtEntryTable[ExceptionType].OrigBundles,
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B0Ptr,
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sizeof (BUNDLE) * NUM_BUNDLES_IN_STUB
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);
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//
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// insert new B0
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//
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gBS->CopyMem (B0Ptr, NewBundles, sizeof (BUNDLE) * NUM_BUNDLES_IN_STUB);
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//
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// fixup IVT entry so it stores its index and whether or not to chain...
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//
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FixupBundle = B0Ptr + 2;
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FixupBundle->high |= ExceptionType << 36;
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InstructionCacheFlush (B0Ptr, 5);
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IvtEntryTable[ExceptionType].RegisteredCallback = NewCallback;
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}
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STATIC
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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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Routine Description:
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Restores original IVT contents when unregistering a callback function
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Arguments:
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IN EFI_EXCEPTION_TYPE ExceptionType,
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Returns:
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Nothing
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--*/
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// TODO: ExceptionType - add argument and description to function comment
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{
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BUNDLE *B0Ptr;
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//
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// Get address of bundle 0
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//
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GetHandlerEntryPoint (ExceptionType, (VOID **) &B0Ptr);
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//
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// restore original bundles in IVT
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//
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gBS->CopyMem (
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B0Ptr,
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IvtEntryTable[ExceptionType].OrigBundles,
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sizeof (BUNDLE) * NUM_BUNDLES_IN_STUB
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);
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InstructionCacheFlush (B0Ptr, 5);
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}
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STATIC
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VOID
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ChainExternalInterrupt (
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IN VOID (*NewCallback) ()
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)
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/*++
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Routine Description:
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Sets up cache flush and calls assembly function to chain external interrupt.
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Records new callback in IvtEntryTable.
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Arguments:
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IN VOID (*NewCallback) ()
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Returns:
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Nothing
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--*/
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// TODO: ) - add argument and description to function comment
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{
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VOID *Start;
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Start = (VOID *) ((UINT8 *) GetIva () + 0x400 * EXCEPT_IPF_EXTERNAL_INTERRUPT + 0x400);
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IvtEntryTable[EXCEPT_IPF_EXTERNAL_INTERRUPT].RegisteredCallback = NewCallback;
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ChainHandler ();
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InstructionCacheFlush (Start, 0x400);
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}
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STATIC
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VOID
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UnchainExternalInterrupt (
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VOID
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)
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/*++
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Routine Description:
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Sets up cache flush and calls assembly function to restore external interrupt.
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Removes registered callback from IvtEntryTable.
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Arguments:
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Nothing
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Returns:
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Nothing
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--*/
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{
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VOID *Start;
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Start = (VOID *) ((UINT8 *) GetIva () + 0x400 * EXCEPT_IPF_EXTERNAL_INTERRUPT + 0x400);
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UnchainHandler ();
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InstructionCacheFlush (Start, 0x400);
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IvtEntryTable[EXCEPT_IPF_EXTERNAL_INTERRUPT].RegisteredCallback = NULL;
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}
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//
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// The rest of the functions in this file are all member functions for the
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// DebugSupport protocol
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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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Routine Description: This is a DebugSupport protocol member function. Hard
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coded to support only 1 processor for now.
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Arguments:
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Returns: Always returns EFI_SUCCESS with *MaxProcessorIndex set to 0
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--*/
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// TODO: This - add argument and description to function comment
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// TODO: MaxProcessorIndex - add argument and description to function comment
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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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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 NewPeriodicCallback
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)
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/*++
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Routine Description:
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DebugSupport protocol member function
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Arguments:
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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 NewPeriodicCallback
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Returns:
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EFI_STATUS - anything other than EFI_SUCCESS indicates the callback was not registered.
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--*/
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// TODO: This - add argument and description to function comment
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// TODO: ProcessorIndex - add argument and description to function comment
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// TODO: NewPeriodicCallback - add argument and description to function comment
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{
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return ManageIvtEntryTable (EXCEPT_IPF_EXTERNAL_INTERRUPT, NULL, NewPeriodicCallback);
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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 NewCallback,
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IN EFI_EXCEPTION_TYPE ExceptionType
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)
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/*++
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Routine Description:
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DebugSupport protocol member function
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Arguments:
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IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
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IN EFI_EXCEPTION_CALLBACK NewCallback,
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IN EFI_EXCEPTION_TYPE ExceptionType
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Returns:
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EFI_STATUS - anything other than EFI_SUCCESS indicates the callback was not registered.
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--*/
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// TODO: This - add argument and description to function comment
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// TODO: ProcessorIndex - add argument and description to function comment
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// TODO: NewCallback - add argument and description to function comment
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// TODO: ExceptionType - add argument and description to function comment
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{
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return ManageIvtEntryTable (
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ExceptionType,
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(BUNDLE *) ((EFI_PLABEL *) HookStub)->EntryPoint,
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NewCallback
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);
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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 UINTN Length
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)
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/*++
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Routine Description:
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DebugSupport protocol member function. Calls assembly routine to flush cache.
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Arguments:
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Returns:
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EFI_SUCCESS
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--*/
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// TODO: This - add argument and description to function comment
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// TODO: ProcessorIndex - add argument and description to function comment
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// TODO: Start - add argument and description to function comment
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// TODO: Length - add argument and description to function comment
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|
{
|
|
InstructionCacheFlush (Start, Length);
|
|
return (EFI_SUCCESS);
|
|
}
|