## Create code for library constructor
#
# @param Info The ModuleAutoGen object
# @param AutoGenC The TemplateString object for C code
# @param AutoGenH The TemplateString object for header file
#
def CreateLibraryConstructorCode(Info, AutoGenC, AutoGenH):
在其中加入如下 代码用于验证：
for Lib in DependentLibraryList:
if len(Lib.ConstructorList) <= 0:
continue
Dict = {'Function':Lib.ConstructorList}
if Lib.ModuleType in [SUP_MODULE_BASE, SUP_MODULE_SEC]:
ConstructorPrototypeString.Append("//www.lab-z.com testing");
ConstructorPrototypeString.Append(gLibraryStructorPrototype[SUP_MODULE_BASE].Replace(Dict))
ConstructorCallingString.Append(gLibraryStructorCall[SUP_MODULE_BASE].Replace(Dict))
/**
Macro that calls DebugPrint().
If MDEPKG_NDEBUG is not defined and the DEBUG_PROPERTY_DEBUG_PRINT_ENABLED
bit of PcdDebugProperyMask is set, then this macro passes Expression to
DebugPrint().
@param Expression Expression containing an error level, a format string,
and a variable argument list based on the format string.
**/
#if !defined(MDEPKG_NDEBUG)
#define DEBUG(Expression) \
do { \
if (DebugPrintEnabled ()) { \
_DEBUG (Expression); \
} \
} while (FALSE)
#else
#define DEBUG(Expression)
#endif
/**
Returns TRUE if DEBUG() macros are enabled.
This function returns TRUE if the DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of
PcdDebugProperyMask is set. Otherwise FALSE is returned.
@retval TRUE The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is set.
@retval FALSE The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is clear.
**/
BOOLEAN
EFIAPI
DebugPrintEnabled (
VOID
)
{
return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_PRINT_ENABLED) != 0);
}
/**
Internal worker macro that calls DebugPrint().
This macro calls DebugPrint() passing in the debug error level, a format
string, and a variable argument list.
__VA_ARGS__ is not supported by EBC compiler, Microsoft Visual Studio .NET 2003
and Microsoft Windows Server 2003 Driver Development Kit (Microsoft WINDDK) version 3790.1830.
@param Expression Expression containing an error level, a format string,
and a variable argument list based on the format string.
**/
#if !defined(MDE_CPU_EBC) && (!defined (_MSC_VER) || _MSC_VER > 1400)
#define _DEBUG_PRINT(PrintLevel, ...) \
do { \
if (DebugPrintLevelEnabled (PrintLevel)) { \
DebugPrint (PrintLevel, ##__VA_ARGS__); \
} \
} while (FALSE)
#define _DEBUG(Expression) _DEBUG_PRINT Expression
#else
#define _DEBUG(Expression) DebugPrint Expression
#endif
/**
Prints a debug message to the debug output device if the specified error level is enabled.
If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
GetDebugPrintErrorLevel (), then print the message specified by Format and the
associated variable argument list to the debug output device.
If Format is NULL, then ASSERT().
@param ErrorLevel The error level of the debug message.
@param Format Format string for the debug message to print.
@param ... Variable argument list whose contents are accessed
based on the format string specified by Format.
**/
VOID
EFIAPI
DebugPrint (
IN UINTN ErrorLevel,
IN CONST CHAR8 *Format,
...
)
{
VA_LIST Marker;
VA_START (Marker, Format);
DebugVPrint (ErrorLevel, Format, Marker);
VA_END (Marker);
}
1.2.2 同一个文件中，定义了函数DebugVPrint()
/**
Prints a debug message to the debug output device if the specified
error level is enabled.
If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
GetDebugPrintErrorLevel (), then print the message specified by Format and
the associated variable argument list to the debug output device.
If Format is NULL, then ASSERT().
@param ErrorLevel The error level of the debug message.
@param Format Format string for the debug message to print.
@param VaListMarker VA_LIST marker for the variable argument list.
**/
VOID
EFIAPI
DebugVPrint (
IN UINTN ErrorLevel,
IN CONST CHAR8 *Format,
IN VA_LIST VaListMarker
)
{
DebugPrintMarker (ErrorLevel, Format, VaListMarker, NULL);
}
1.2.3 同一个文件中 DebugPrintMarker() 代码如下：
/**
Prints a debug message to the debug output device if the specified
error level is enabled base on Null-terminated format string and a
VA_LIST argument list or a BASE_LIST argument list.
If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
GetDebugPrintErrorLevel (), then print the message specified by Format and
the associated variable argument list to the debug output device.
If Format is NULL, then ASSERT().
@param ErrorLevel The error level of the debug message.
@param Format Format string for the debug message to print.
@param VaListMarker VA_LIST marker for the variable argument list.
@param BaseListMarker BASE_LIST marker for the variable argument list.
**/
VOID
DebugPrintMarker (
IN UINTN ErrorLevel,
IN CONST CHAR8 *Format,
IN VA_LIST VaListMarker,
IN BASE_LIST BaseListMarker
)
{
CHAR8 Buffer[MAX_DEBUG_MESSAGE_LENGTH];
UINTN Length;
//
// If Format is NULL, then ASSERT().
//
ASSERT (Format != NULL);
//
// Check if the global mask disables this message or the device is inactive
//
if ((ErrorLevel & GetDebugPrintErrorLevel ()) == 0 ||
!PlatformDebugLibIoPortFound ()) {
return;
}
//
// Convert the DEBUG() message to an ASCII String
//
if (BaseListMarker == NULL) {
Length = AsciiVSPrint (Buffer, sizeof (Buffer), Format, VaListMarker);
} else {
Length = AsciiBSPrint (Buffer, sizeof (Buffer), Format, BaseListMarker);
}
//
// Send the print string to the debug I/O port
//
IoWriteFifo8 (PcdGet16 (PcdDebugIoPort), Length, Buffer);
}
其中PcdDebugIoPort定义在 \OvmfPkg\OvmfPkg.dec文件中：
## This flag is used to control the destination port for PlatformDebugLibIoPort
gUefiOvmfPkgTokenSpaceGuid.PcdDebugIoPort|0x402|UINT16|4
BITS 64
;
; Some values were calculated in 32-bit mode. Make sure the upper
; 32-bits of 64-bit registers are zero for these values.
;
mov rax, 0x00000000ffffffff
and rsi, rax
and rbp, rax
and rsp, rax
;
; RSI - SEC Core entry point
; RBP - Start of BFV
;
;
; Restore initial EAX value into the RAX register
;
mov rax, rsp
;
; Jump to the 64-bit SEC entry point
;
jmp rsi
这里加入代码，从0x402 Port输出 rsi的值：
;
; Restore initial EAX value into the RAX register
;
mov rax, rsp
mov rax,rsi
mov dx,0x402
; 7-0 Bits
out dx,al
; 15-8 Bits
shr rax,8
out dx,al
; 23-16 Bits
shr rax,8
out dx,al
; 31-24 Bits
shr rax,8
out dx,al
; 39-32 Bits
shr rax,8
out dx,al
; 47-40 Bits
shr rax,8
out dx,al
; 55-48 Bits
shr rax,8
out dx,al
; 63-56 Bits
shr rax,8
out dx,al
接下来在SecEntry.nasm添加代码，输出当前 rip 的值：
;
; SecCore Entry Point
;
; Processor is in flat protected mode
;
; @param[in] RAX Initial value of the EAX register (BIST: Built-in Self Test)
; @param[in] DI 'BP': boot-strap processor, or 'AP': application processor
; @param[in] RBP Pointer to the start of the Boot Firmware Volume
; @param[in] DS Selector allowing flat access to all addresses
; @param[in] ES Selector allowing flat access to all addresses
; @param[in] FS Selector allowing flat access to all addresses
; @param[in] GS Selector allowing flat access to all addresses
; @param[in] SS Selector allowing flat access to all addresses
;
; @return None This routine does not return
;
global ASM_PFX(_ModuleEntryPoint)
ASM_PFX(_ModuleEntryPoint):
lea rax,[$]
mov dx,0x402
; 7-0 Bits
out dx,al
; 15-8 Bits
shr rax,8
out dx,al
; 23-16 Bits
shr rax,8
out dx,al
; 31-24 Bits
shr rax,8
out dx,al
; 39-32 Bits
shr rax,8
out dx,al
; 47-40 Bits
shr rax,8
out dx,al
; 55-48 Bits
shr rax,8
out dx,al
; 63-56 Bits
shr rax,8
out dx,al
;
; Fill the temporary RAM with the initial stack value.
; The loop below will seed the heap as well, but that's harmless.
;
mov rax, (FixedPcdGet32 (PcdInitValueInTempStack) << 32) | FixedPcdGet32 (PcdInitValueInTempStack)
; qword to store
mov rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base address,
; relative to
; ES
mov rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count
cld ; store from base
; up
rep stosq
;
; The VTF signature
;
; VTF-0 means that the VTF (Volume Top File) code does not require
; any fixups.
;
vtfSignature:
DB 'V', 'T', 'F', 0
ALIGN 16
resetVector:
;
; Reset Vector
;
; This is where the processor will begin execution
;
nop
nop
jmp EarlyBspInitReal16
ALIGN 16
fourGigabytes:
;
; Modified: EBX, ECX, EDX, EBP
;
; @param[in,out] RAX/EAX Initial value of the EAX register
; (BIST: Built-in Self Test)
; @param[in,out] DI 'BP': boot-strap processor, or
; 'AP': application processor
; @param[out] RBP/EBP Address of Boot Firmware Volume (BFV)
; @param[out] DS Selector allowing flat access to all addresses
; @param[out] ES Selector allowing flat access to all addresses
; @param[out] FS Selector allowing flat access to all addresses
; @param[out] GS Selector allowing flat access to all addresses
; @param[out] SS Selector allowing flat access to all addresses
;
; @return None This routine jumps to SEC and does not return
;
Main16:
OneTimeCall EarlyInit16
其中 EarlyInit16在Init16.asm 中：
;
; Modified: EAX
;
; @param[in] EAX Initial value of the EAX register (BIST: Built-in Self Test)
; @param[out] ESP Initial value of the EAX register (BIST: Built-in Self Test)
;
EarlyInit16:
;
; ESP - Initial value of the EAX register (BIST: Built-in Self Test)
;
mov esp, eax
debugInitialize //这是空的宏
OneTimeCallRet EarlyInit16
返回 EarlyInit16 后继续：
;
; Transition the processor from 16-bit real mode to 32-bit flat mode
;
OneTimeCall TransitionFromReal16To32BitFlat
;
; Search for the Boot Firmware Volume (BFV)
;
OneTimeCall Flat32SearchForBfvBase
