ArmPlatformPkg/ArmPlatformLib: Introduce ArmPlatformSecBootAction function

This function is called at the initial stage of the Secure boot process to allow
platform vendors to add early actions.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12413 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Boot.S

@@ -21,6 +21,7 @@
 .text
 .align 3
 
+GCC_ASM_EXPORT(ArmPlatformSecBootAction)
 GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)
 GCC_ASM_IMPORT(PL35xSmcInitialize)
 
@@ -59,6 +60,18 @@ VersatileExpressSmcConfiguration:
     .word     PL350_SMC_SET_OPMODE_MEM_WIDTH_32 | PL350_SMC_SET_OPMODE_SET_RD_SYNC | PL350_SMC_SET_OPMODE_SET_WR_SYNC
 VersatileExpressSmcConfigurationEnd:
 
+/**
+  Call at the beginning of the platform boot up
+
+  This function allows the firmware platform to do extra actions at the early
+  stage of the platform power up.
+
+  Note: This function must be implemented in assembler as there is no stack set up yet
+
+**/
+ASM_PFX(ArmPlatformSecBootAction):
+  bx    lr
+
 /**
   Initialize the memory where the initial stacks will reside
 

ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Boot.asm

@@ -20,6 +20,7 @@
 
   INCLUDE AsmMacroIoLib.inc
 
+  EXPORT  ArmPlatformSecBootAction
   EXPORT  ArmPlatformInitializeBootMemory
   IMPORT  PL35xSmcInitialize
 
@@ -61,6 +62,18 @@ VersatileExpressSmcConfiguration
     DCD     PL350_SMC_SET_OPMODE_MEM_WIDTH_32 :OR: PL350_SMC_SET_OPMODE_SET_RD_SYNC :OR: PL350_SMC_SET_OPMODE_SET_WR_SYNC
 VersatileExpressSmcConfigurationEnd
 
+/**
+  Call at the beginning of the platform boot up
+
+  This function allows the firmware platform to do extra actions at the early
+  stage of the platform power up.
+
+  Note: This function must be implemented in assembler as there is no stack set up yet
+
+**/
+ArmPlatformSecBootAction
+  bx  lr
+
 /**
   Initialize the memory where the initial stacks will reside