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b6ee589805
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11069 6f19259b-4bc3-4df7-8a09-765794883524
155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
/** @file
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Debug Agent library implementition.
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Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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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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**/
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#include "SmmDebugAgentLib.h"
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DEBUG_AGENT_MAILBOX *mMailboxPointer = NULL;
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DEBUG_AGENT_MAILBOX mLocalMailbox;
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UINTN mSavedDebugRegisters[6];
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CONST BOOLEAN MultiProcessorDebugSupport = FALSE;
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/**
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Get Debug Agent Mailbox pointer.
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@return Mailbox pointer.
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**/
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DEBUG_AGENT_MAILBOX *
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GetMailboxPointer (
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VOID
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)
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{
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return mMailboxPointer;
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}
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/**
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Get debug port handle.
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@return Debug port handle.
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**/
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DEBUG_PORT_HANDLE
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GetDebugPortHandle (
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VOID
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)
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{
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return (DEBUG_PORT_HANDLE) (UINTN)(mMailboxPointer->DebugPortHandle);
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}
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/**
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Store debug register when SMI exit.
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**/
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VOID
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SaveDebugRegister (
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VOID
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)
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{
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mSavedDebugRegisters[0] = AsmReadDr0 ();
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mSavedDebugRegisters[1] = AsmReadDr1 ();
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mSavedDebugRegisters[2] = AsmReadDr2 ();
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mSavedDebugRegisters[3] = AsmReadDr3 ();
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mSavedDebugRegisters[4] = AsmReadDr6 ();
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mSavedDebugRegisters[5] = AsmReadDr7 ();
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}
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/**
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Restore debug register when SMI exit.
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**/
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VOID
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RestoreDebugRegister (
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VOID
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)
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{
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AsmWriteDr7 (0);
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AsmWriteDr0 (mSavedDebugRegisters[0]);
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AsmWriteDr1 (mSavedDebugRegisters[1]);
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AsmWriteDr2 (mSavedDebugRegisters[2]);
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AsmWriteDr3 (mSavedDebugRegisters[3]);
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AsmWriteDr6 (mSavedDebugRegisters[4]);
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AsmWriteDr7 (mSavedDebugRegisters[5]);
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}
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/**
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Initialize debug agent.
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This function is used to set up debug enviroment for source level debug
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in SMM code.
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If InitFlag is DEBUG_AGENT_INIT_SMM, it will overirde IDT table entries
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and initialize debug port. It will get debug agent Mailbox from GUIDed HOB,
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it it exists, debug agent wiil copied it into the local Mailbox in SMM space.
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it will overirde IDT table entries and initialize debug port. Context will be
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NULL.
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If InitFlag is DEBUG_AGENT_INIT_ENTER_SMI, debug agent will save Debug
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Registers and get local Mailbox in SMM space. Context will be NULL.
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If InitFlag is DEBUG_AGENT_INIT_EXIT_SMI, debug agent will restore Debug
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Registers. Context will be NULL.
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@param[in] InitFlag Init flag is used to decide initialize process.
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@param[in] Context Context needed according to InitFlag.
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@param[in] Function Continue function called by debug agent library; it was
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optional.
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**/
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VOID
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EFIAPI
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InitializeDebugAgent (
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IN UINT32 InitFlag,
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IN VOID *Context, OPTIONAL
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IN DEBUG_AGENT_CONTINUE Function OPTIONAL
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)
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{
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EFI_STATUS Status;
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UINT64 DebugPortHandle;
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switch (InitFlag) {
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case DEBUG_AGENT_INIT_SMM:
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Status = EfiGetSystemConfigurationTable (&gEfiDebugAgentGuid, (VOID **) &mMailboxPointer);
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if (EFI_ERROR (Status) || mMailboxPointer == NULL) {
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ZeroMem (&mLocalMailbox, sizeof (DEBUG_AGENT_MAILBOX));
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mMailboxPointer = &mLocalMailbox;
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}
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break;
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case DEBUG_AGENT_INIT_ENTER_SMI:
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SaveDebugRegister ();
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InitializeDebugIdt ();
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if (mMailboxPointer != NULL) {
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//
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// Initialize debug communication port
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//
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DebugPortHandle = (UINT64) (UINTN)DebugPortInitialize ((DEBUG_PORT_HANDLE) (UINTN)mMailboxPointer->DebugPortHandle, NULL);
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mMailboxPointer->DebugPortHandle = DebugPortHandle;
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if (mMailboxPointer->DebugFlag.Bits.BreakOnNextSmi == 1) {
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//
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// If SMM entry break is set, SMM code will be break at here.
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//
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CpuBreakpoint ();
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}
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}
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break;
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case DEBUG_AGENT_INIT_EXIT_SMI:
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RestoreDebugRegister ();
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break;
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}
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}
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