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这里只介绍常用的，因为不常用的我也搞不明白。第一个需要了解的是：很多命令可以在后面加入 -b 来做分屏显示。这个参数在查看help的时候非常有用。

比如下面就是运行 help -b 的结果

下面是简单介绍一些命令。

alias 可以用来给一些命令设置“别名”。比如：我们在Shell下可以用 dir 和ls一样列出当前目录就是因为设置 dir 为 ls的别名。

实验一下，我们设置 alias dog ls,那么输入 dog 也和ls一样

attribute 更改文件属性，和DOS下面的那个命令一样

直接运行可以列出文件的属性

支持通配符，比如下面给这几个文件加上只读属性之后就无法删除了

cls 清屏幕，它后面可以跟着一个参数，清屏之后设置背景的颜色

color – New background color
0 – Black
1 – Blue
2 – Green
3 – Cyan
4 – Red
5 – Magenta
6 – Yellow
7 – Light gray

例如：

cp 拷贝，和DOS下面著名的copy命令一样。它提供了一个参数 -r, 可以用来递归进入目录进行拷贝。简单的说就是你可以用这个参数来copy目录

前面的例子都是在 NT32 模拟环境中运行的，在启动这个环境的时候会有一个5秒的滚动条。为了更爽快一些，可以将这个滚动条设置为一闪而过，马上进入Shell环境。“以文找文”，搜索“Start showing progress bar”字样，确定下面的代码显示这个字符串：

\IntelFrameworkModulePkg\Universal\BdsDxe\FrontPage.c (Experiment)

/**

  Function show progress bar to wait for user input.

  @param TimeoutDefault  - The fault time out value before the system

                         continue to boot.

  @retval  EFI_SUCCESS       User pressed some key except "Enter"

  @retval  EFI_TIME_OUT      Timout expired or user press "Enter"

**/

EFI_STATUS

ShowProgress (

  IN UINT16                       TimeoutDefault

  )

{

  EFI_STATUS                    Status;

  CHAR16                        *TmpStr;

  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Foreground;

  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Background;

  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Color;

  EFI_INPUT_KEY                 Key;

  UINT16                        TimeoutRemain;

  if (TimeoutDefault == 0) {

    return EFI_TIMEOUT;

  }

  DEBUG ((EFI_D_INFO, "\n\nStart showing progress bar... Press any key to stop it! .\n"));

  SetMem (&Foreground, sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL), 0xff);

  SetMem (&Background, sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL), 0x0);

  SetMem (&Color, sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL), 0xff);

  //

  // Clear the progress status bar first

  //

  TmpStr = GetStringById (STRING_TOKEN (STR_START_BOOT_OPTION));

  if (TmpStr != NULL) {

    PlatformBdsShowProgress (Foreground, Background, TmpStr, Color, 0, 0);

  }

 

 

追踪发现是下面的代码调用到上面的  \IntelFrameworkModulePkg\Universal\BdsDxe\FrontPage.c (Experiment)

/**

  This function is the main entry of the platform setup entry.

  The function will present the main menu of the system setup,

  this is the platform reference part and can be customize.

  @param TimeoutDefault     The fault time out value before the system

                            continue to boot.

  @param ConnectAllHappened The indicater to check if the connect all have

                            already happened.

**/

VOID

PlatformBdsEnterFrontPage (

  IN UINT16                       TimeoutDefault,

  IN BOOLEAN                      ConnectAllHappened

  )

…………………………

…………………………

  HotkeyBoot ();

  if (TimeoutDefault != 0xffff) {

    Status = ShowProgress (TimeoutDefault);

    StatusHotkey = HotkeyBoot ();

 

上面的代码又是下面调用到的

  //

  // Init the time out value

  //

  Timeout = PcdGet16 (PcdPlatformBootTimeOut);

 

 

最后确定参数是来自 PCD ,修改 \Nt32Pkg\Nt32Pkg.dsc

[PcdsDynamicHii.common.DEFAULT]

gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdSetupConOutColumn|L”SetupConsoleConfig”|gEfiGlobalVariableGuid|0x0|80

gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdSetupConOutRow|L”SetupConsoleConfig”|gEfiGlobalVariableGuid|0x4|25

gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdPlatformBootTimeOut|L”Timeout”|gEfiGlobalVariableGuid|0x0|10

gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdHardwareErrorRecordLevel|L”HwErrRecSupport”|gEfiGlobalVariableGuid|0x0|1

将上面红色标记的修改为你希望的即可.

这里是一个修改为20秒的例子

如果你在Shell下直接使用 Float 或者 Double 在编译的时候会遇到这样的问题

Architecture(s) = IA32
Build target = DEBUG
Toolchain = VS2008

Active Platform = c:\edk2\Nt32Pkg\Nt32Pkg.dsc
Flash Image Definition = c:\edk2\Nt32Pkg\Nt32Pkg.fdf

Processing meta-data … done!
“C:\Program Files\Microsoft Visual Studio 9.0\Vc\bin\link.exe” /out:”c:\edk2\Build\NT32\DEBUG_VS2008\IA32\SecMain.exe” /base:0x10000000 /pdb:”c:\edk2\Build\NT32\DEBUG_VS2008\IA32\SecMain.pdb” /LIBPATH:”C:\Program Files\Microsoft Visual Studio 9.0\VC\Lib” /LIBPATH:”C:\Program Files\Microsoft Visual Studio 9.0\VC\PlatformSdk\Lib” /NOLOGO /SUBSYSTEM:CONSOLE /NODEFAULTLIB /IGNORE:4086 /MAP /OPT:REF /DEBUG /MACHINE:I386 /LTCG Kernel32.lib MSVCRTD.lib Gdi32.lib User32.lib Winmm.lib Advapi32.lib /EXPORT:InitializeDriver=_ModuleEntryPoint /ALIGN:4096 /FILEALIGN:4096 /SUBSYSTEM:CONSOLE @c:\edk2\Build\NT32\DEBUG_VS2008\IA32\Nt32Pkg\Sec\SecMain\OUTPUT\static_library_files.lst
LINK : warning LNK4108: /ALIGN specified without /DRIVER; image may not run
LINK : warning LNK4001: no object files specified; libraries used
Creating library c:\edk2\Build\NT32\DEBUG_VS2008\IA32\SecMain.lib and object c:\edk2\Build\NT32\DEBUG_VS2008\IA32\SecMain.exp
Generating code
Finished generating code
“C:\Program Files\Microsoft Visual Studio 9.0\Vc\bin\link.exe” /OUT:c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\DEBUG\FloatTest.dll /NOLOGO /NODEFAULTLIB /IGNORE:4001 /OPT:REF /OPT:ICF=10 /MAP /ALIGN:32 /SECTION:.xdata,D /SECTION:.pdata,D /MACHINE:X86 /LTCG /DLL /ENTRY:_ModuleEntryPoint /SUBSYSTEM:EFI_BOOT_SERVICE_DRIVER /SAFESEH:NO /BASE:0 /DRIVER /DEBUG /EXPORT:InitializeDriver=_ModuleEntryPoint /ALIGN:4096 /FILEALIGN:4096 /SUBSYSTEM:CONSOLE @c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\OUTPUT\static_library_files.lst
Creating library c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\DEBUG\FloatTest.lib and object c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\DEBUG\FloatTest.exp
Generating code
Finished generating code
c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\DEBUG\FloatTest.dll : warning LNK4086: entrypoint ‘__ModuleEntryPoint’ is not __stdcall with 12 bytes of arguments; image may not run
FloatTest.lib(floattest.obj) : error LNK2001: unresolved external symbol __fltused
c:\edk2\Build\NT32\DEBUG_VS2008\IA32\MdeModulePkg\Application\floattest\floattest\DEBUG\FloatTest.dll : fatal error LNK1120: 1 unresolved externals

我baidu和google之后得到的大概的结论是：UEFI 替换了Link中的默认库（CRT.LIB?），但是因为MS的编译器存在一个bug，所以导致仍然使用部分的默认库，所以导致这样的问题【这个解释存疑，不确定】。至于解决方法，经过我的实验确认就是使用 EADK 库【参考1】。我的理解是这个库是用来替代标准C库编写EDKII程序的，因此Float之类在其中也有重新定义。

加入方法：

1.解压EADK，然后将其中三个目录放到你EDK2的根目录下

2.修改 Nt32Pkg.dsc 加入红色部分

#
# Misc
#
DebugLib|IntelFrameworkModulePkg/Library/PeiDxeDebugLibReportStatusCode/PeiDxeDebugLibReportStatusCode.inf
DebugPrintErrorLevelLib|MdeModulePkg/Library/DxeDebugPrintErrorLevelLib/DxeDebugPrintErrorLevelLib.inf
PerformanceLib|MdePkg/Library/BasePerformanceLibNull/BasePerformanceLibNull.inf
DebugAgentLib|MdeModulePkg/Library/DebugAgentLibNull/DebugAgentLibNull.inf
#LABZ_Start
SortLib|ShellPkg/Library/UefiSortLib/UefiSortLib.inf
FileHandleLib|ShellPkg/Library/UefiFileHandleLib/UefiFileHandleLib.inf
ShellLib|ShellPkg/Library/UefiShellLib/UefiShellLib.inf
ShellCEntryLib|ShellPkg/Library/UefiShellCEntryLib/UefiShellCEntryLib.inf
LibC|StdLib/LibC/LibC.inf
LibStdLib|StdLib/LibC/StdLib/StdLib.inf
LibString|StdLib/LibC/String/String.inf
LibWchar|StdLib/LibC/Wchar/Wchar.inf
LibCType|StdLib/LibC/Ctype/Ctype.inf
LibTime|StdLib/LibC/Time/Time.inf
LibStdio|StdLib/LibC/Stdio/Stdio.inf
LibGdtoa|StdLib/LibC/gdtoa/gdtoa.inf
LibLocale|StdLib/LibC/Locale/Locale.inf
LibUefi|StdLib/LibC/Uefi/Uefi.inf
LibMath|StdLib/LibC/Math/Math.inf
LibSignal|StdLib/LibC/Signal/Signal.inf
LibNetUtil|StdLib/LibC/NetUtil/NetUtil.inf
#LABZ_End
[LibraryClasses.common.USER_DEFINED]
DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
ReportStatusCodeLib|MdeModulePkg/Library/PeiReportStatusCodeLib/PeiReportStatusCodeLib.inf
OemHookStatusCodeLib|Nt32Pkg/Library/PeiNt32OemHookStatusCodeLib/PeiNt32OemHookStatusCodeLib.inf
MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf

3. floattest.inf 中必须加入下面2个

[LibraryClasses]
UefiApplicationEntryPoint
UefiLib
PcdLib
ShellCEntryLib
ShellLib
LibMath
LibC|

下面就可以在你的代码中放心大胆的使用Float了。

一个计算 Pi 的Shell Application

#include <Library/UefiLib.h>
#include <Library/ShellCEntryLib.h>

//
// Based on code found at http://code.google.com/p/my-itoa/
//
int 
Integer2AsciiString(int val, char* buf)
{
    const unsigned int radix = 10;

    char* p = buf;
    unsigned int a; 
    int len;
    char* b;
    char temp;
    unsigned int u;

    if (val < 0) {
        *p++ = '-';
        val = 0 - val;
    }
    u = (unsigned int)val;
    b = p;

    do {
        a = u % radix;
        u /= radix;
        *p++ =(char) a + '0';
    } while (u > 0);

    len = (int)(p - buf);
    *p-- = 0;

    // swap 
    do {
       temp = *p; *p = *b; *b = temp;
       --p; ++b;
    } while (b < p);

    return len;
}

//
// Based on code found on the Internet (author unknown)
// Search for ftoa implementations
//
int 
Float2AsciiString(float f, char *buffer, int numdecimals)
{
    int status = 0;
    char *s = buffer;
    long mantissa, int_part, frac_part;
    short exp2;
    char m;

    typedef union {
        long L;
        float F;
    } LF_t;
    LF_t x;

    if (f == 0.0) {           // return 0.00
        *s++ = '0'; *s++ = '.'; *s++ = '0'; *s++ = '0'; 
        *s = 0;
       return status;
    }

    x.F = f;

    exp2 = (unsigned char)(x.L >> 23) - 127;
    mantissa = (x.L & 0xFFFFFF) | 0x800000;
    frac_part = 0;
    int_part = 0;

    if (exp2 >= 31 || exp2 < -23) {
        *s = 0;
        return 1;
    } 

    if (exp2 >= 0) {
        int_part = mantissa >> (23 - exp2);
        frac_part = (mantissa << (exp2 + 1)) & 0xFFFFFF;
    } else {
        frac_part = (mantissa & 0xFFFFFF) >> -(exp2 + 1);
    }

    if (int_part == 0)
       *s++ = '0';
    else {
        Integer2AsciiString(int_part, s);
        while (*s) s++;
    }
    *s++ = '.';

    if (frac_part == 0)
        *s++ = '0';
    else {
        for (m = 0; m < numdecimals; m++) {                       // print BCD
            frac_part = (frac_part << 3) + (frac_part << 1);      // frac_part *= 10
            *s++ = (frac_part >> 24) + '0';
            frac_part &= 0xFFFFFF;
        }
    }
    *s = 0;

    return status;
}

VOID
Ascii2UnicodeString(CHAR8 *String, CHAR16 *UniString)
{
    while (*String != '\0') {
        *(UniString++) = (CHAR16) *(String++);
    }
    *UniString = '\0';
}

//PI= 4- /3+4/5-4/7+4/9
EFI_STATUS 
EFIAPI
CalcPI()
{
    char str[8];
    static CHAR16 wstr[8];
    int i;

    float g1 = (float) 1;
    float g2 = (float) 0;

    for (i=0;i<100;i++)
     {
	if (i%2==0) {g2=g2+ 4/ g1;}
        else {g2=g2-4/ g1;}
	Float2AsciiString(g2, str, 4);         
	Ascii2UnicodeString(str, wstr);
	Print(L" PI: %s\n", wstr);
        g1=g1+2;
     }

    return EFI_SUCCESS;
}

EFI_STATUS 
EFIAPI
UefiMain(EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
{

    CalcPI();

    return EFI_SUCCESS;
}

运行结果：

示例代码下载 floattest

参考：

1.http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=EDKII_EADK

EDK II Application Development Kit for include the Standard C Libraries in UEFI Shell Applications