IntelFspPkg/FspSecCore add AsmGetFspBaseAddressNoStack and AsmGetFspInfoHeaderNoStack

Fix GCC issue on FspInfoHeaderRelativeOff.
Clean up comments for platform ID matching on Microcode and PcdFspBootFirmwareVolumeBase

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <Jiewen.Yao@intel.com>
Reviewed-by: "Rangarajan, Ravi P" <ravi.p.rangarajan@intel.com>
Reviewed-by: "Mudusuru, Giri P" <giri.p.mudusuru@intel.com>
Reviewed-by: "Ma, Maurice" <maurice.ma@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17496 6f19259b-4bc3-4df7-8a09-765794883524

4 files changed, 76 insertions, 9 deletions

diff --git a/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.asm b/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.asm
index a0c9b1e..d0e56b2 100644
--- a/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.asm
+++ b/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.asm
@@ -143,8 +143,8 @@ check_main_header:
    mov   ecx, MSR_IA32_PLATFORM_ID

    rdmsr

    mov   ecx, edx

-   shr   ecx, 50-32

-   and   ecx, 7h

+   shr   ecx, 50-32                          ; shift (50d-32d=18d=0x12) bits

+   and   ecx, 7h                             ; platform id at bit[52..50]

    mov   edx, 1

    shl   edx, cl

 

@@ -569,7 +569,7 @@ FspApiCommon   PROC C PUBLIC
   ;

   ; Pass BFV into the PEI Core

   ; It uses relative address to calucate the actual boot FV base

-  ; For FSP impleantion with single FV, PcdFlashFvRecoveryBase and

+  ; For FSP implementation with single FV, PcdFspBootFirmwareVolumeBase and

   ; PcdFspAreaBaseAddress are the same. For FSP with mulitple FVs,

   ; they are different. The code below can handle both cases.

   ;

diff --git a/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.s b/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.s
index 8f4093c..d9cfcc3 100644
--- a/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.s
+++ b/IntelFspPkg/FspSecCore/Ia32/FspApiEntry.s
@@ -297,8 +297,8 @@ CheckMainHeader:
    movl   $MSR_IA32_PLATFORM_ID, %ecx

    rdmsr

    movl   %edx, %ecx

-   shrl   $0x12, %ecx                        #($50-$32)

-   andl   $0x07, %ecx

+   shrl   $0x12, %ecx                        # shift (50d-32d=18d=0x12) bits

+   andl   $0x07, %ecx                        # platform id at bit[52..50]

    movl   $0x01, %edx

    shll   %cl,%edx

 

@@ -784,7 +784,7 @@ FspApiCommonL2:
   #

   # Pass BFV into the PEI Core

   # It uses relative address to calucate the actual boot FV base

-  # For FSP impleantion with single FV, PcdFlashFvRecoveryBase and

+  # For FSP implementation with single FV, PcdFspBootFirmwareVolumeBase and

   # PcdFspAreaBaseAddress are the same. For FSP with mulitple FVs,

   # they are different. The code below can handle both cases.

   #

diff --git a/IntelFspPkg/FspSecCore/Ia32/FspHelper.asm b/IntelFspPkg/FspSecCore/Ia32/FspHelper.asm
index 8efea01..b991386 100644
--- a/IntelFspPkg/FspSecCore/Ia32/FspHelper.asm
+++ b/IntelFspPkg/FspSecCore/Ia32/FspHelper.asm
@@ -15,6 +15,10 @@
     .model  flat,C

     .code

 

+;

+; FspInfoHeaderRelativeOff is patched during build process and initialized to offset of the  AsmGetFspBaseAddress 

+; from the FSP Info header. 

+;

 FspInfoHeaderRelativeOff    PROC      NEAR    PUBLIC

    ;

    ; This value will be pached by the build script

@@ -22,6 +26,11 @@ FspInfoHeaderRelativeOff    PROC      NEAR    PUBLIC
    DD    012345678h

 FspInfoHeaderRelativeOff    ENDP

 

+;

+; Returns FSP Base Address. 

+;

+; This function gets the FSP Info Header using relative addressing and returns the FSP Base from the header structure

+;

 AsmGetFspBaseAddress        PROC      NEAR    PUBLIC

    mov   eax, AsmGetFspBaseAddress

    sub   eax, dword ptr [FspInfoHeaderRelativeOff]

@@ -30,10 +39,35 @@ AsmGetFspBaseAddress        PROC      NEAR    PUBLIC
    ret

 AsmGetFspBaseAddress        ENDP

 

+;

+; No stack counter part of AsmGetFspBaseAddress. Return address is in edi.

+;

+AsmGetFspBaseAddressNoStack    PROC      NEAR    PUBLIC

+   mov   eax, AsmGetFspBaseAddress

+   sub   eax, dword ptr [FspInfoHeaderRelativeOff]

+   add   eax, 01Ch   

+   mov   eax, dword ptr [eax]

+   jmp   edi

+AsmGetFspBaseAddressNoStack    ENDP

+

+;

+; Returns FSP Info Header. 

+;

+; This function gets the FSP Info Header using relative addressing and returns it

+;

 AsmGetFspInfoHeader         PROC      NEAR    PUBLIC

    mov   eax, AsmGetFspBaseAddress

    sub   eax, dword ptr [FspInfoHeaderRelativeOff]

    ret

 AsmGetFspInfoHeader         ENDP

 

+;

+; No stack counter part of AsmGetFspInfoHeader. Return address is in edi.

+;

+AsmGetFspInfoHeaderNoStack         PROC      NEAR    PUBLIC

+   mov   eax, AsmGetFspBaseAddress

+   sub   eax, dword ptr [FspInfoHeaderRelativeOff]

+   jmp   edi

+AsmGetFspInfoHeaderNoStack         ENDP

+

      END
\ No newline at end of file
diff --git a/IntelFspPkg/FspSecCore/Ia32/FspHelper.s b/IntelFspPkg/FspSecCore/Ia32/FspHelper.s
index a6cf362..55d8ae7 100644
--- a/IntelFspPkg/FspSecCore/Ia32/FspHelper.s
+++ b/IntelFspPkg/FspSecCore/Ia32/FspHelper.s
@@ -15,6 +15,10 @@
 #

 #------------------------------------------------------------------------------

 

+#

+# FspInfoHeaderRelativeOff is patched during build process and initialized to offset of the  AsmGetFspBaseAddress 

+# from the FSP Info header. 

+#

 ASM_GLOBAL ASM_PFX(FspInfoHeaderRelativeOff)

 ASM_PFX(FspInfoHeaderRelativeOff):

    #

@@ -22,17 +26,46 @@ ASM_PFX(FspInfoHeaderRelativeOff):
    #

    .long    0x012345678

 

-

+#

+# Returns FSP Base Address. 

+#

+# This function gets the FSP Info Header using relative addressing and returns the FSP Base from the header structure

+#

 ASM_GLOBAL ASM_PFX(AsmGetFspBaseAddress)

 ASM_PFX(AsmGetFspBaseAddress):

    mov    $AsmGetFspBaseAddress, %eax

-   sub    $FspInfoHeaderRelativeOff, %eax

+   sub    FspInfoHeaderRelativeOff, %eax

    add    $0x01C, %eax

    mov    (%eax), %eax

    ret

 

+#

+# No stack counter part of AsmGetFspBaseAddress. Return address is in edi.

+#

+ASM_GLOBAL ASM_PFX(AsmGetFspBaseAddressNoStack)

+ASM_PFX(AsmGetFspBaseAddressNoStack):

+   mov    $AsmGetFspBaseAddress, %eax

+   sub    FspInfoHeaderRelativeOff, %eax

+   add    $0x01C, %eax 

+   mov    (%eax), %eax

+   jmp    *%edi

+

+#

+# Returns FSP Info Header. 

+#

+# This function gets the FSP Info Header using relative addressing and returns it

+#

 ASM_GLOBAL ASM_PFX(AsmGetFspInfoHeader)

 ASM_PFX(AsmGetFspInfoHeader):

    mov    $AsmGetFspBaseAddress, %eax

-   sub    $FspInfoHeaderRelativeOff, %eax

+   sub    FspInfoHeaderRelativeOff, %eax

    ret

+   

+#

+# No stack counter part of AsmGetFspInfoHeader. Return address is in edi.

+#

+ASM_GLOBAL ASM_PFX(AsmGetFspInfoHeaderNoStack)

+ASM_PFX(AsmGetFspInfoHeaderNoStack):

+   mov    $AsmGetFspBaseAddress, %eax

+   sub    FspInfoHeaderRelativeOff, %eax

+   jmp    *%edi