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audk/EmbeddedPkg/Ebl/Command.c

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/** @file
Basic commands and command processing infrastructure for EBL
Copyright (c) 2007, Intel Corporation<BR>
Portions copyright (c) 2008-2009, Apple Inc. All rights reserved.
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "Ebl.h"
#include <Protocol/DiskIo.h>
#include <Protocol/BlockIo.h>
UINTN mCmdTableMaxIndex = EBL_MAX_COMMAND_COUNT;
UINTN mCmdTableNextFreeIndex = 0;
EBL_COMMAND_TABLE *mCmdTable[EBL_MAX_COMMAND_COUNT];
/**
Converts a lowercase Ascii character to upper one
If Chr is lowercase Ascii character, then converts it to upper one.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param chr one Ascii character
@return The uppercase value of Ascii character
**/
STATIC
CHAR8
AsciiToUpper (
IN CHAR8 Chr
)
{
return (UINT8) ((Chr >= 'a' && Chr <= 'z') ? Chr - ('a' - 'A') : Chr);
}
/**
Case insensitve comparison of two Null-terminated Unicode strings with maximum
lengths, and returns the difference between the first mismatched Unicode
characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. At most, Length Unicode
characters will be compared. If Length is 0, then 0 is returned. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched Unicode character in SecondString
subtracted from the first mismatched Unicode character in FirstString.
@param FirstString Pointer to a Null-terminated ASCII string.
@param SecondString Pointer to a Null-terminated ASCII string.
@param Length Max length to compare.
@retval 0 FirstString is identical to SecondString using case insensitive
comparisons.
@retval !=0 FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
AsciiStrniCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString,
IN UINTN Length
)
{
if (Length == 0) {
return 0;
}
while ((AsciiToUpper (*FirstString) != '\0') &&
(AsciiToUpper (*FirstString) == AsciiToUpper (*SecondString)) &&
(Length > 1)) {
FirstString++;
SecondString++;
Length--;
}
return AsciiToUpper (*FirstString) - AsciiToUpper (*SecondString);
}
/**
Add a command to the mCmdTable. If there is no free space in the command
table ASSERT. The mCmdTable is maintained in alphabetical order and the
new entry is inserted into its sorted possition.
@param Entry Commnad Entry to add to the CmdTable
**/
VOID
EFIAPI
EblAddCommand (
IN const EBL_COMMAND_TABLE *Entry
)
{
UINTN Count;
if (mCmdTableNextFreeIndex == EBL_MAX_COMMAND_COUNT) {
//
// Ran out of space to store commands. Increase EBL_MAX_COMMAND_COUNT
//
ASSERT (FALSE);
return;
}
//
// Add command and Insertion sort array in the process
//
mCmdTable[mCmdTableNextFreeIndex] = (EBL_COMMAND_TABLE *)Entry;
if (mCmdTableNextFreeIndex != 0) {
for (Count = mCmdTableNextFreeIndex; Count > 0; Count--) {
if (AsciiStriCmp (mCmdTable[Count - 1]->Name, Entry->Name) <= 0) {
break;
}
mCmdTable[Count] = mCmdTable[Count - 1];
}
mCmdTable[Count] = (EBL_COMMAND_TABLE *)Entry;
}
mCmdTableNextFreeIndex++;
}
/**
Add an set of commands to the command table. Most commonly used on static
array of commands.
@param EntryArray Pointer to array of command entries
@param ArrayCount Number of commnad entries to add
**/
VOID
EFIAPI
EblAddCommands (
IN const EBL_COMMAND_TABLE *EntryArray,
IN UINTN ArrayCount
)
{
UINTN Index;
for (Index = 0; Index < ArrayCount; Index++) {
EblAddCommand (&EntryArray[Index]);
}
}
EBL_ADD_COMMAND_PROTOCOL gEblAddCommand = {
EblAddCommand,
EblAddCommands,
EblGetCharKey,
EblAnyKeyToContinueQtoQuit
};
/**
Return the best matching command for the passed in command name. The match
does not have to be exact, it just needs to be unqiue. This enables commands
to be shortend to the smallest set of starting characters that is unique.
@param CommandName Name of command to search for
@return NULL CommandName did not match or was not unique
Other Pointer to EBL_COMMAND_TABLE entry for CommandName
**/
EBL_COMMAND_TABLE *
EblGetCommand (
IN CHAR8 *CommandName
)
{
UINTN Index;
UINTN BestMatchCount;
UINTN Length;
EBL_COMMAND_TABLE *Match;
CHAR8 *Str;
Length = AsciiStrLen (CommandName);
Str = AsciiStrStr (CommandName, ".");
if (Str != NULL) {
// If the command includes a trailing . command extension skip it for the match.
// Example: hexdump.4
Length = (UINTN)(Str - CommandName);
}
for (Index = 0, BestMatchCount = 0, Match = NULL; Index < mCmdTableNextFreeIndex; Index++) {
if (AsciiStriCmp (mCmdTable[Index]->Name, CommandName) == 0) {
// match a command exactly
return mCmdTable[Index];
}
if (AsciiStrniCmp (CommandName, mCmdTable[Index]->Name, Length) == 0) {
// partial match, so keep looking to make sure there is only one partial match
BestMatchCount++;
Match = mCmdTable[Index];
}
}
if (BestMatchCount == 1) {
return Match;
}
//
// We had no matches or too many matches
//
return NULL;
}
UINTN
CountNewLines (
IN CHAR8 *Str
)
{
UINTN Count;
if (Str == NULL) {
return 0;
}
for (Count = 0; *Str != '\0'; Str++) {
if (Str[Count] == '\n') {
Count++;
}
}
return Count;
}
/**
List out help information on all the commands or print extended information
about a specific passed in command.
Argv[0] - "help"
Argv[1] - Command to display help about
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS
**/
EFI_STATUS
EblHelpCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
UINTN Index;
CHAR8 *Ptr;
UINTN CurrentRow = 0;
if (Argc == 1) {
// Print all the commands
AsciiPrint ("Embedded Boot Loader (EBL) commands (help command for more info):\n");
CurrentRow++;
for (Index = 0; Index < mCmdTableNextFreeIndex; Index++) {
EblSetTextColor (EFI_YELLOW);
AsciiPrint (" %a", mCmdTable[Index]->Name);
EblSetTextColor (0);
AsciiPrint ("%a\n", mCmdTable[Index]->HelpSummary);
// Handle multi line help summaries
CurrentRow += CountNewLines (mCmdTable[Index]->HelpSummary);
if (EblAnyKeyToContinueQtoQuit (&CurrentRow, FALSE)) {
break;
}
}
} else if (Argv[1] != NULL) {
// Print specific help
for (Index = 0, CurrentRow = 0; Index < mCmdTableNextFreeIndex; Index++) {
if (AsciiStriCmp (Argv[1], mCmdTable[Index]->Name) == 0) {
Ptr = (mCmdTable[Index]->Help == NULL) ? mCmdTable[Index]->HelpSummary : mCmdTable[Index]->Help;
AsciiPrint ("%a%a\n", Argv[1], Ptr);
// Handle multi line help summaries
CurrentRow += CountNewLines (Ptr);
if (EblAnyKeyToContinueQtoQuit (&CurrentRow, FALSE)) {
break;
}
}
}
}
return EFI_SUCCESS;
}
/**
Exit the EBL. If the commnad processor sees EFI_ABORTED return status it will
exit the EBL.
Argv[0] - "exit"
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_ABORTED
**/
EFI_STATUS
EblExitCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
EFI_STATUS Status;
UINTN MemoryMapSize;
EFI_MEMORY_DESCRIPTOR *MemoryMap;
UINTN MapKey;
UINTN DescriptorSize;
UINT32 DescriptorVersion;
UINTN Pages;
if (Argc > 1) {
if (AsciiStriCmp (Argv[1], "efi") != 0) {
return EFI_ABORTED;
}
} else if (Argc == 1) {
return EFI_ABORTED;
}
MemoryMap = NULL;
MemoryMapSize = 0;
do {
Status = gBS->GetMemoryMap (
&MemoryMapSize,
MemoryMap,
&MapKey,
&DescriptorSize,
&DescriptorVersion
);
if (Status == EFI_BUFFER_TOO_SMALL) {
Pages = EFI_SIZE_TO_PAGES (MemoryMapSize) + 1;
MemoryMap = AllocatePages (Pages);
//
// Get System MemoryMap
//
Status = gBS->GetMemoryMap (
&MemoryMapSize,
MemoryMap,
&MapKey,
&DescriptorSize,
&DescriptorVersion
);
// Don't do anything between the GetMemoryMap() and ExitBootServices()
if (!EFI_ERROR (Status)) {
Status = gBS->ExitBootServices (gImageHandle, MapKey);
if (EFI_ERROR (Status)) {
FreePages (MemoryMap, Pages);
MemoryMap = NULL;
MemoryMapSize = 0;
}
}
}
} while (EFI_ERROR (Status));
//
// At this point it is very dangerous to do things EFI as most of EFI is now gone.
// This command is useful if you are working with a debugger as it will shutdown
// DMA and other things that could break a soft resets.
//
CpuDeadLoop ();
// Should never get here, but makes the compiler happy
return EFI_ABORTED;
}
/**
Update the screen by decrementing the timeout value.
This AsciiPrint has to match the AsciiPrint in
EblPauseCmd.
@param ElaspedTime Current timout value remaining
**/
VOID
EFIAPI
EblPauseCallback (
IN UINTN ElapsedTime
)
{
AsciiPrint ("\b\b\b\b\b\b\b\b\b\b\b\b \b\b%3d seconds", ElapsedTime);
}
/**
Pause until a key is pressed and abort the remaining commands on the command
line. If no key is pressed continue processing the command line. This command
allows the user to stop an operation from happening and return control to the
command prompt.
Argv[0] - "pause"
Argv[1] - timeout value is decimal seconds
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS Timeout expired with no input
@return EFI_TIMEOUT Stop procesing other commands on the same command line
**/
EFI_STATUS
EblPauseCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
EFI_STATUS Status;
UINTN Delay;
EFI_INPUT_KEY Key;
Delay = (Argc == 1)? 10 : AsciiStrDecimalToUintn (Argv[1]);
AsciiPrint ("Hit any key to break. You have %3d seconds", Delay);
Status = EblGetCharKey (&Key, Delay, EblPauseCallback);
AsciiPrint ("\n");
// If we timeout then the pause succeded thus return success
// If we get a key return timout to stop other commnad on this cmd line
return (Status == EFI_SUCCESS) ? EFI_TIMEOUT : EFI_SUCCESS;;
}
/**
On a debug build issue a software breakpoint to enter the debugger
Argv[0] - "break"
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS
**/
EFI_STATUS
EblBreakPointCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
CpuBreakpoint ();
return EFI_SUCCESS;
}
/**
Reset the system. If no Argument do a Cold reset. If argument use that reset type
(W)arm = Warm Reset
(S)hutdown = Shutdown Reset
Argv[0] - "reset"
Argv[1] - warm or shutdown reset type
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS
**/
EFI_STATUS
EblResetCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
EFI_RESET_TYPE ResetType;
ResetType = EfiResetCold;
if (Argc > 1) {
switch (*Argv[1]) {
case 'W':
case 'w':
ResetType = EfiResetWarm;
break;
case 'S':
case 's':
ResetType = EfiResetShutdown;
}
}
gRT->ResetSystem (ResetType, EFI_SUCCESS, 0, NULL);
return EFI_SUCCESS;
}
/**
Toggle page break global. This turns on and off prompting to Quit or hit any
key to continue when a command is about to scroll the screen with its output
Argv[0] - "page"
Argv[1] - on or off
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS
**/
EFI_STATUS
EblPageCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
if (Argc <= 1) {
// toggle setting
gPageBreak = (gPageBreak) ? FALSE : TRUE;
} else {
// use argv to set the value
if ((Argv[1][0] == 'o') || (Argv[1][0] == 'O')) {
if ((Argv[1][1] == 'n') || (Argv[1][1] == 'N')) {
gPageBreak = TRUE;
} else if ((Argv[1][1] == 'f') || (Argv[1][1] == 'F')) {
gPageBreak = FALSE;
} else {
return EFI_INVALID_PARAMETER;
}
}
}
return EFI_SUCCESS;
}
EFI_STATUS
EblSleepCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
UINTN Delay;
Delay = (Argc == 1)? 10 : AsciiStrDecimalToUintn (Argv[1]);
gBS->Stall (Delay * 1000000);
return EFI_SUCCESS;
}
CHAR8
ConvertToTextLine (
IN CHAR8 Character
)
{
if (Character < ' ' || Character > '~') {
return '.';
} else {
return Character;
}
}
UINTN
GetBytes (
IN UINT8 *Address,
IN UINTN Bytes
)
{
UINTN Result = 0;
if (Bytes >= 1) {
Result = *Address++;
}
if (Bytes >= 2) {
Result = (Result << 8) + *Address++;
}
if (Bytes >= 3) {
Result = (Result << 8) + *Address++;
}
return Result;
}
CHAR8 mBlanks[] = " ";
EFI_STATUS
OutputData (
IN UINT8 *Address,
IN UINTN Length,
IN UINTN Width,
IN UINTN Offset
)
{
UINT8 *EndAddress;
UINTN Line;
CHAR8 TextLine[0x11];
UINTN CurrentRow = 0;
UINTN Bytes;
UINTN Spaces = 0;
CHAR8 Blanks[80];
AsciiStrCpy (Blanks, mBlanks);
for (EndAddress = Address + Length; Address < EndAddress; Offset += Line) {
AsciiPrint ("%08x: ", Offset);
for (Line = 0; (Line < 0x10) && (Address < EndAddress);) {
Bytes = EndAddress - Address;
switch (Width) {
case 4:
if (Bytes >= 4) {
AsciiPrint ("%08x ", *((UINT32 *)Address));
TextLine[Line++] = ConvertToTextLine(*Address++);
TextLine[Line++] = ConvertToTextLine(*Address++);
TextLine[Line++] = ConvertToTextLine(*Address++);
TextLine[Line++] = ConvertToTextLine(*Address++);
} else {
AsciiPrint ("%08x ", GetBytes(Address, Bytes));
Address += Bytes;
Line += Bytes;
}
break;
case 2:
if (Bytes >= 2) {
AsciiPrint ("%04x ", *((UINT16 *)Address));
TextLine[Line++] = ConvertToTextLine(*Address++);
TextLine[Line++] = ConvertToTextLine(*Address++);
} else {
AsciiPrint ("%04x ", GetBytes(Address, Bytes));
Address += Bytes;
Line += Bytes;
}
break;
case 1:
AsciiPrint ("%02x ", *((UINT8 *)Address));
TextLine[Line++] = ConvertToTextLine(*Address++);
break;
default:
AsciiPrint ("Width must be 1, 2, or 4!\n");
return EFI_INVALID_PARAMETER;
}
}
// Pad spaces
if (Line < 0x10) {
switch (Width) {
case 4:
Spaces = 9 * ((0x10 - Line)/4);
break;
case 2:
Spaces = 5 * ((0x10 - Line)/2);
break;
case 1:
Spaces = 3 * (0x10 - Line);
break;
}
Blanks[Spaces] = '\0';
AsciiPrint(Blanks);
Blanks[Spaces] = ' ';
}
TextLine[Line] = 0;
AsciiPrint ("|%a|\n", TextLine);
if (EblAnyKeyToContinueQtoQuit (&CurrentRow, FALSE)) {
return EFI_END_OF_FILE;
}
}
if (Length % Width != 0) {
AsciiPrint ("%08x\n", Offset);
}
return EFI_SUCCESS;
}
/**
See if command contains .# where # is a number. Return # as the Width
or 1 as the default Width for commands.
Example hexdump.4 returns a width of 4.
@param Argv Argv[0] is the comamnd name
@return Width of command
**/
UINTN
WidthFromCommandName (
IN CHAR8 *Argv,
IN UINTN Default
)
{
CHAR8 *Str;
UINTN Width;
//Hexdump.2 HexDump.4 mean use a different width
Str = AsciiStrStr (Argv, ".");
if (Str != NULL) {
Width = AsciiStrDecimalToUintn (Str + 1);
if (Width == 0) {
Width = Default;
}
} else {
// Default answer
return Default;
}
return Width;
}
#define HEXDUMP_CHUNK 1024
/**
Toggle page break global. This turns on and off prompting to Quit or hit any
key to continue when a command is about to scroll the screen with its output
Argv[0] - "hexdump"[.#] # is optional 1,2, or 4 for width
Argv[1] - Device or File to dump.
Argv[2] - Optional offset to start dumping
Argv[3] - Optional number of bytes to dump
@param Argc Number of command arguments in Argv
@param Argv Array of strings that represent the parsed command line.
Argv[0] is the comamnd name
@return EFI_SUCCESS
**/
EFI_STATUS
EblHexdumpCmd (
IN UINTN Argc,
IN CHAR8 **Argv
)
{
EFI_OPEN_FILE *File;
VOID *Location;
UINTN Size;
UINTN Width;
UINTN Offset = 0;
EFI_STATUS Status;
UINTN Chunk = HEXDUMP_CHUNK;
if ((Argc < 2) || (Argc > 4)) {
return EFI_INVALID_PARAMETER;
}
Width = WidthFromCommandName (Argv[0], 1);
if ((Width != 1) && (Width != 2) && (Width != 4)) {
return EFI_INVALID_PARAMETER;
}
File = EfiOpen (Argv[1], EFI_FILE_MODE_READ, 0);
if (File == NULL) {
return EFI_NOT_FOUND;
}
Location = AllocatePool (Chunk);
Size = (Argc > 3) ? AsciiStrHexToUintn (Argv[3]) : EfiTell (File, NULL);
Offset = 0;
if (Argc > 2) {
Offset = AsciiStrHexToUintn (Argv[2]);
if (Offset > 0) {
// Make sure size includes the part of the file we have skipped
Size += Offset;
}
}
Status = EfiSeek (File, Offset, EfiSeekStart);
if (EFI_ERROR (Status)) {
goto Exit;
}
for (; Offset + HEXDUMP_CHUNK <= Size; Offset += Chunk) {
Chunk = HEXDUMP_CHUNK;
Status = EfiRead (File, Location, &Chunk);
if (EFI_ERROR(Status)) {
AsciiPrint ("Error reading file content\n");
goto Exit;
}
Status = OutputData (Location, Chunk, Width, File->BaseOffset + Offset);
if (EFI_ERROR(Status)) {
if (Status == EFI_END_OF_FILE) {
Status = EFI_SUCCESS;
}
goto Exit;
}
}
// Any left over?
if (Offset < Size) {
Chunk = Size - Offset;
Status = EfiRead (File, Location, &Chunk);
if (EFI_ERROR(Status)) {
AsciiPrint ("Error reading file content\n");
goto Exit;
}
Status = OutputData (Location, Chunk, Width, File->BaseOffset + Offset);
if (EFI_ERROR(Status)) {
if (Status == EFI_END_OF_FILE) {
Status = EFI_SUCCESS;
}
goto Exit;
}
}
Exit:
EfiClose (File);
FreePool (Location);
return EFI_SUCCESS;
}
GLOBAL_REMOVE_IF_UNREFERENCED const EBL_COMMAND_TABLE mCmdTemplate[] =
{
{
"reset",
" [type]; Reset system. type = [warm] [shutdown] default is cold reset",
NULL,
EblResetCmd
},
{
"exit",
"; Exit EBL",
NULL,
EblExitCmd
},
{
"help",
" [cmd]; Help on cmd or a list of all commands if cmd is ommited",
NULL,
EblHelpCmd
},
{
"break",
"; Generate debugging breakpoint",
NULL,
EblBreakPointCmd
},
{
"page",
" [on|off]]; toggle promting on command output larger than screen",
NULL,
EblPageCmd
},
{
"pause",
" [sec]; Pause for sec[10] seconds. ",
NULL,
EblPauseCmd
},
{
"sleep",
" [sec]; Sleep for sec[10] seconds. ",
NULL,
EblSleepCmd
},
{
"hexdump",
"[.{1|2|4}] filename [Offset] [Size]; dump a file as hex .width",
NULL,
EblHexdumpCmd
}
};
EFI_HANDLE gExternalCmdHandle = NULL;
/**
Initialize the commands in this in this file
**/
VOID
EblInitializeCmdTable (
VOID
)
{
EblAddCommands (mCmdTemplate, sizeof (mCmdTemplate)/sizeof (EBL_COMMAND_TABLE));
gBS->InstallProtocolInterface (
&gExternalCmdHandle,
&gEfiEblAddCommandProtocolGuid,
EFI_NATIVE_INTERFACE,
&gEblAddCommand
);
}
VOID
EblShutdownExternalCmdTable (
VOID
)
{
gBS->UninstallProtocolInterface (gExternalCmdHandle, &gEfiEblAddCommandProtocolGuid, &gEblAddCommand);
}
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