d60b4c43c1
An exception error occured in EBL when gST->ConOut had not been intialized. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11954 6f19259b-4bc3-4df7-8a09-765794883524
673 lines
18 KiB
C
673 lines
18 KiB
C
/** @file
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Basic command line parser for EBL (Embedded Boot Loader)
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Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2009, Apple Inc. 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 "Ebl.h"
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// Globals for command history processing
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INTN mCmdHistoryEnd = -1;
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INTN mCmdHistoryStart = -1;
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INTN mCmdHistoryCurrent = -1;
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CHAR8 mCmdHistory[MAX_CMD_HISTORY][MAX_CMD_LINE];
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CHAR8 *mCmdBlank = "";
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// Globals to remember current screen geometry
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UINTN gScreenColumns;
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UINTN gScreenRows;
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// Global to turn on/off breaking commands with prompts before they scroll the screen
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BOOLEAN gPageBreak = TRUE;
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VOID
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RingBufferIncrement (
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IN INTN *Value
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)
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{
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*Value = *Value + 1;
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if (*Value >= MAX_CMD_HISTORY) {
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*Value = 0;
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}
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}
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VOID
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RingBufferDecrement (
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IN INTN *Value
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)
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{
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*Value = *Value - 1;
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if (*Value < 0) {
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*Value = MAX_CMD_HISTORY - 1;
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}
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}
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/**
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Save this command in the circular history buffer. Older commands are
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overwritten with newer commands.
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@param Cmd Command line to archive the history of.
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@return None
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**/
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VOID
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SetCmdHistory (
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IN CHAR8 *Cmd
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)
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{
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// Don't bother adding empty commands to the list
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if (AsciiStrLen(Cmd) != 0) {
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// First entry
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if (mCmdHistoryStart == -1) {
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mCmdHistoryStart = 0;
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mCmdHistoryEnd = 0;
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} else {
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// Record the new command at the next index
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RingBufferIncrement(&mCmdHistoryStart);
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// If the next index runs into the end index, shuffle end back by one
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if (mCmdHistoryStart == mCmdHistoryEnd) {
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RingBufferIncrement(&mCmdHistoryEnd);
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}
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}
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// Copy the new command line into the ring buffer
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AsciiStrnCpy(&mCmdHistory[mCmdHistoryStart][0], Cmd, MAX_CMD_LINE);
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}
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// Reset the command history for the next up arrow press
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mCmdHistoryCurrent = mCmdHistoryStart;
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}
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/**
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Retreave data from the Command History buffer. Direction maps into up arrow
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an down arrow on the command line
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@param Direction Command forward or back
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@return The Command history based on the Direction
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**/
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CHAR8 *
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GetCmdHistory (
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IN UINT16 Direction
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)
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{
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CHAR8 *HistoricalCommand = NULL;
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// No history yet?
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if (mCmdHistoryCurrent == -1) {
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HistoricalCommand = mCmdBlank;
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goto Exit;
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}
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if (Direction == SCAN_UP) {
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HistoricalCommand = &mCmdHistory[mCmdHistoryCurrent][0];
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// if we just echoed the last command, hang out there, don't wrap around
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if (mCmdHistoryCurrent == mCmdHistoryEnd) {
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goto Exit;
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}
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// otherwise, back up by one
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RingBufferDecrement(&mCmdHistoryCurrent);
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} else if (Direction == SCAN_DOWN) {
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// if we last echoed the start command, put a blank prompt out
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if (mCmdHistoryCurrent == mCmdHistoryStart) {
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HistoricalCommand = mCmdBlank;
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goto Exit;
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}
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// otherwise increment the current pointer and return that command
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RingBufferIncrement(&mCmdHistoryCurrent);
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RingBufferIncrement(&mCmdHistoryCurrent);
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HistoricalCommand = &mCmdHistory[mCmdHistoryCurrent][0];
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RingBufferDecrement(&mCmdHistoryCurrent);
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}
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Exit:
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return HistoricalCommand;
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}
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/**
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Parse the CmdLine and break it up into Argc (arg count) and Argv (array of
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pointers to each argument). The Cmd buffer is altered and seperators are
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converted to string terminators. This allows Argv to point into CmdLine.
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A CmdLine can support multiple commands. The next command in the command line
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is returned if it exists.
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@param CmdLine String to parse for a set of commands
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@param Argc Returns the number of arguments in the CmdLine current command
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@param Argv Argc pointers to each string in CmdLine
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@return Next Command in the command line or NULL if non exists
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**/
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CHAR8 *
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ParseArguments (
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IN CHAR8 *CmdLine,
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OUT UINTN *Argc,
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OUT CHAR8 **Argv
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)
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{
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UINTN Arg;
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CHAR8 *Char;
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BOOLEAN LookingForArg;
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BOOLEAN InQuote;
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*Argc = 0;
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if (AsciiStrLen (CmdLine) == 0) {
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return NULL;
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}
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// Walk a single command line. A CMD_SEPERATOR allows mult commands on a single line
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InQuote = FALSE;
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LookingForArg = TRUE;
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for (Char = CmdLine, Arg = 0; *Char != '\0'; Char++) {
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if (!InQuote && *Char == CMD_SEPERATOR) {
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break;
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}
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// Perform any text conversion here
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if (*Char == '\t') {
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// TAB to space
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*Char = ' ';
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}
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if (LookingForArg) {
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// Look for the beging of an Argv[] entry
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if (*Char == '"') {
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Argv[Arg++] = ++Char;
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LookingForArg = FALSE;
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InQuote = TRUE;
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} else if (*Char != ' ') {
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Argv[Arg++] = Char;
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LookingForArg = FALSE;
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}
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} else {
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// Looking for the terminator of an Argv[] entry
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if (!InQuote && (*Char == ' ')) {
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*Char = '\0';
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LookingForArg = TRUE;
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} else if (!InQuote && (*Char == '"') && (*(Char-1) != '\\')) {
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InQuote = TRUE;
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} else if (InQuote && (*Char == '"') && (*(Char-1) != '\\')) {
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*Char = '\0';
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InQuote = FALSE;
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}
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}
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}
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*Argc = Arg;
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if (*Char == CMD_SEPERATOR) {
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// Replace the command delimeter with null and return pointer to next command line
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*Char = '\0';
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return ++Char;
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}
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return NULL;
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}
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/**
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Return a keypress or optionally timeout if a timeout value was passed in.
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An optional callback funciton is called evey second when waiting for a
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timeout.
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@param Key EFI Key information returned
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@param TimeoutInSec Number of seconds to wait to timeout
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@param CallBack Callback called every second during the timeout wait
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@return EFI_SUCCESS Key was returned
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@return EFI_TIMEOUT If the TimoutInSec expired
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**/
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EFI_STATUS
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EblGetCharKey (
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IN OUT EFI_INPUT_KEY *Key,
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IN UINTN TimeoutInSec,
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IN EBL_GET_CHAR_CALL_BACK CallBack OPTIONAL
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)
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{
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EFI_STATUS Status;
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UINTN WaitCount;
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UINTN WaitIndex;
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EFI_EVENT WaitList[2];
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WaitCount = 1;
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WaitList[0] = gST->ConIn->WaitForKey;
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if (TimeoutInSec != 0) {
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// Create a time event for 1 sec duration if we have a timeout
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gBS->CreateEvent (EVT_TIMER, 0, NULL, NULL, &WaitList[1]);
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gBS->SetTimer (WaitList[1], TimerPeriodic, EFI_SET_TIMER_TO_SECOND);
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WaitCount++;
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}
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for (;;) {
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Status = gBS->WaitForEvent (WaitCount, WaitList, &WaitIndex);
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ASSERT_EFI_ERROR (Status);
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switch (WaitIndex) {
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case 0:
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// Key event signaled
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Status = gST->ConIn->ReadKeyStroke (gST->ConIn, Key);
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if (!EFI_ERROR (Status)) {
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if (WaitCount == 2) {
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gBS->CloseEvent (WaitList[1]);
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}
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return EFI_SUCCESS;
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}
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break;
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case 1:
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// Periodic 1 sec timer signaled
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TimeoutInSec--;
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if (CallBack != NULL) {
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// Call the users callback function if registered
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CallBack (TimeoutInSec);
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}
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if (TimeoutInSec == 0) {
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gBS->CloseEvent (WaitList[1]);
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return EFI_TIMEOUT;
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}
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break;
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default:
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ASSERT (FALSE);
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}
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}
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}
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/**
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This routine is used prevent command output data from scrolling off the end
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of the screen. The global gPageBreak is used to turn on or off this feature.
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If the CurrentRow is near the end of the screen pause and print out a prompt
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If the use hits Q to quit return TRUE else for any other key return FALSE.
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PrefixNewline is used to figure out if a newline is needed before the prompt
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string. This depends on the last print done before calling this function.
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CurrentRow is updated by one on a call or set back to zero if a prompt is
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needed.
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@param CurrentRow Used to figure out if its the end of the page and updated
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@param PrefixNewline Did previous print issue a newline
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@return TRUE if Q was hit to quit, FALSE in all other cases.
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**/
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BOOLEAN
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EblAnyKeyToContinueQtoQuit (
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IN UINTN *CurrentRow,
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IN BOOLEAN PrefixNewline
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)
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{
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EFI_INPUT_KEY InputKey;
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if (!gPageBreak) {
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// global disable for this feature
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return FALSE;
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}
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if (*CurrentRow >= (gScreenRows - 2)) {
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if (PrefixNewline) {
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AsciiPrint ("\n");
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}
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AsciiPrint ("Any key to continue (Q to quit): ");
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EblGetCharKey (&InputKey, 0, NULL);
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AsciiPrint ("\n");
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// Time to promt to stop the screen. We have to leave space for the prompt string
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*CurrentRow = 0;
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if (InputKey.UnicodeChar == 'Q' || InputKey.UnicodeChar == 'q') {
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return TRUE;
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}
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} else {
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*CurrentRow += 1;
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}
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return FALSE;
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}
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/**
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Set the text color of the EFI Console. If a zero is passed in reset to
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default text/background color.
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@param Attribute For text and background color
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**/
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VOID
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EblSetTextColor (
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UINTN Attribute
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)
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{
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if (Attribute == 0) {
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// Set the text color back to default
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Attribute = (UINTN)PcdGet32 (PcdEmbeddedDefaultTextColor);
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}
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gST->ConOut->SetAttribute (gST->ConOut, Attribute);
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}
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/**
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Collect the keyboard input for a cmd line. Carage Return, New Line, or ESC
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terminates the command line. You can edit the command line via left arrow,
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delete and backspace and they all back up and erase the command line.
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No edit of commnad line is possible without deletion at this time!
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The up arrow and down arrow fill Cmd with information from the history
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buffer.
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@param Cmd Command line to return
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@param CmdMaxSize Maximum size of Cmd
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@return The Status of EblGetCharKey()
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**/
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EFI_STATUS
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GetCmd (
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IN OUT CHAR8 *Cmd,
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IN UINTN CmdMaxSize
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)
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{
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EFI_STATUS Status;
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UINTN Index;
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UINTN Index2;
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CHAR8 Char;
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CHAR8 *History;
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EFI_INPUT_KEY Key;
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for (Index = 0; Index < CmdMaxSize - 1;) {
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Status = EblGetCharKey (&Key, 0, NULL);
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if (EFI_ERROR (Status)) {
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Cmd[Index] = '\0';
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AsciiPrint ("\n");
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return Status;
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}
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Char = (CHAR8)Key.UnicodeChar;
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if ((Char == '\n') || (Char == '\r') || (Char == 0x7f)) {
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Cmd[Index] = '\0';
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if (FixedPcdGetBool(PcdEmbeddedShellCharacterEcho) == TRUE) {
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AsciiPrint ("\n\r");
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}
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return EFI_SUCCESS;
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} else if ((Char == '\b') || (Key.ScanCode == SCAN_LEFT) || (Key.ScanCode == SCAN_DELETE)){
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if (Index != 0) {
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Index--;
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//
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// Update the display
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//
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AsciiPrint ("\b \b");
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}
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} else if ((Key.ScanCode == SCAN_UP) || Key.ScanCode == SCAN_DOWN) {
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History = GetCmdHistory (Key.ScanCode);
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//
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// Clear display line
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//
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for (Index2 = 0; Index2 < Index; Index2++) {
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AsciiPrint ("\b \b");
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}
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AsciiPrint (History);
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Index = AsciiStrLen (History);
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AsciiStrnCpy (Cmd, History, CmdMaxSize);
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} else {
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Cmd[Index++] = Char;
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if (FixedPcdGetBool(PcdEmbeddedShellCharacterEcho) == TRUE) {
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AsciiPrint ("%c", Char);
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}
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}
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}
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return EFI_SUCCESS;
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}
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/**
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Print the boot up banner for the EBL.
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**/
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VOID
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EblPrintStartupBanner (
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VOID
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)
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{
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AsciiPrint ("Embedded Boot Loader (");
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EblSetTextColor (EFI_YELLOW);
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AsciiPrint ("EBL");
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EblSetTextColor (0);
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AsciiPrint (") prototype. Built at %a on %a\n",__TIME__, __DATE__);
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AsciiPrint ("THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN 'AS IS' BASIS,\nWITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\n");
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AsciiPrint ("Please send feedback to edk2-devel@lists.sourceforge.net\n");
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}
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/**
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Send null requests to all removable media block IO devices so the a media add/remove/change
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can be detected in real before we execute a command.
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This is mainly due to the fact that the FAT driver does not do this today so you can get stale
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dir commands after an SD Card has been removed.
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**/
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VOID
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EblProbeRemovableMedia (
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VOID
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)
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{
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UINTN Index;
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UINTN Max;
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EFI_OPEN_FILE *File;
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//
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// Probe for media insertion/removal in removable media devices
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//
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Max = EfiGetDeviceCounts (EfiOpenBlockIo);
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if (Max != 0) {
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for (Index = 0; Index < Max; Index++) {
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File = EfiDeviceOpenByType (EfiOpenBlockIo, Index);
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if (File != NULL) {
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if (File->FsBlockIoMedia->RemovableMedia) {
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// Probe to see if media is present (or not) or media changed
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// this causes the ReinstallProtocolInterface() to fire in the
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// block io driver to update the system about media change events
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File->FsBlockIo->ReadBlocks (File->FsBlockIo, File->FsBlockIo->Media->MediaId, (EFI_LBA)0, 0, NULL);
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}
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EfiClose (File);
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}
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}
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}
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}
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/**
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Print the prompt for the EBL.
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**/
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VOID
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EblPrompt (
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VOID
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)
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{
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EblSetTextColor (EFI_YELLOW);
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AsciiPrint ("%a %a",(CHAR8 *)PcdGetPtr (PcdEmbeddedPrompt), EfiGetCwd ());
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EblSetTextColor (0);
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AsciiPrint ("%a", ">");
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}
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/**
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Parse a command line and execute the commands. The ; seperator allows
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multiple commands for each command line. Stop processing if one of the
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commands returns an error.
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@param CmdLine Command Line to process.
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@param MaxCmdLineSize MaxSize of the Command line
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@return EFI status of the Command
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**/
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EFI_STATUS
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ProcessCmdLine (
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IN CHAR8 *CmdLine,
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IN UINTN MaxCmdLineSize
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)
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{
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EFI_STATUS Status;
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EBL_COMMAND_TABLE *Cmd;
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CHAR8 *Ptr;
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UINTN Argc;
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CHAR8 *Argv[MAX_ARGS];
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// Parse the command line. The loop processes commands seperated by ;
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for (Ptr = CmdLine, Status = EFI_SUCCESS; Ptr != NULL;) {
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Ptr = ParseArguments (Ptr, &Argc, Argv);
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if (Argc != 0) {
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Cmd = EblGetCommand (Argv[0]);
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if (Cmd != NULL) {
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// Execute the Command!
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Status = Cmd->Command (Argc, Argv);
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if (Status == EFI_ABORTED) {
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// exit command so lets exit
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break;
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} else if (Status == EFI_TIMEOUT) {
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// pause command got imput so don't process any more cmd on this cmd line
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break;
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} else if (EFI_ERROR (Status)) {
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AsciiPrint ("%a returned %r error\n", Cmd->Name, Status);
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// if any command fails stop processing CmdLine
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break;
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}
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}
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}
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}
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return Status;
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}
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/**
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Embedded Boot Loader (EBL) - A simple EFI command line application for embedded
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devices. PcdEmbeddedAutomaticBootCommand is a complied in commnad line that
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gets executed automatically. The ; seperator allows multiple commands
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for each command line.
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@param ImageHandle EFI ImageHandle for this application.
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@param SystemTable EFI system table
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@return EFI status of the applicaiton
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**/
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EFI_STATUS
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EFIAPI
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EdkBootLoaderEntry (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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CHAR8 CmdLine[MAX_CMD_LINE];
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CHAR16 *CommandLineVariable = NULL;
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CHAR16 *CommandLineVariableName = L"default-cmdline";
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UINTN CommandLineVariableSize = 0;
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EFI_GUID VendorGuid;
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// Initialize tables of commnads
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EblInitializeCmdTable ();
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EblInitializeDeviceCmd ();
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EblInitializemdHwDebugCmds ();
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EblInitializemdHwIoDebugCmds ();
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EblInitializeDirCmd ();
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EblInitializeHobCmd ();
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EblInitializeScriptCmd ();
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EblInitializeExternalCmd ();
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EblInitializeNetworkCmd();
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EblInitializeVariableCmds ();
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if (gST->ConOut == NULL) {
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DEBUG((EFI_D_ERROR,"Errot: No Console Output\n"));
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return EFI_NOT_READY;
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}
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// Disable the 5 minute EFI watchdog time so we don't get automatically reset
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gBS->SetWatchdogTimer (0, 0, 0, NULL);
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if (FeaturePcdGet (PcdEmbeddedMacBoot)) {
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// A MAC will boot in graphics mode, so turn it back to text here
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// This protocol was removed from edk2. It is only an edk thing. We need to make our own copy.
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// DisableQuietBoot ();
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// Enable the biggest output screen size possible
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gST->ConOut->SetMode (gST->ConOut, (UINTN)gST->ConOut->Mode->MaxMode - 1);
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}
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// Save current screen mode
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gST->ConOut->QueryMode (gST->ConOut, gST->ConOut->Mode->Mode, &gScreenColumns, &gScreenRows);
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EblPrintStartupBanner ();
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// Parse command line and handle commands seperated by ;
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// The loop prints the prompt gets user input and saves history
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// Look for a variable with a default command line, otherwise use the Pcd
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ZeroMem(&VendorGuid, sizeof(EFI_GUID));
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Status = gRT->GetVariable(CommandLineVariableName, &VendorGuid, NULL, &CommandLineVariableSize, CommandLineVariable);
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if (Status == EFI_BUFFER_TOO_SMALL) {
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CommandLineVariable = AllocatePool(CommandLineVariableSize);
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Status = gRT->GetVariable(CommandLineVariableName, &VendorGuid, NULL, &CommandLineVariableSize, CommandLineVariable);
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if (!EFI_ERROR(Status)) {
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UnicodeStrToAsciiStr(CommandLineVariable, CmdLine);
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}
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FreePool(CommandLineVariable);
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}
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if (EFI_ERROR(Status)) {
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AsciiStrCpy (CmdLine, (CHAR8 *)PcdGetPtr (PcdEmbeddedAutomaticBootCommand));
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}
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for (;;) {
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Status = ProcessCmdLine (CmdLine, MAX_CMD_LINE);
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if (Status == EFI_ABORTED) {
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// if a command returns EFI_ABORTED then exit the EBL
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EblShutdownExternalCmdTable ();
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return EFI_SUCCESS;
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}
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// get the command line from the user
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EblPrompt ();
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GetCmd (CmdLine, MAX_CMD_LINE);
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SetCmdHistory (CmdLine);
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if (FeaturePcdGet (PcdEmbeddedProbeRemovable)) {
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// Probe removable media devices to see if media has been inserted or removed.
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EblProbeRemovableMedia ();
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}
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}
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}
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