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/ArmRealViewEbPkg/Library/ArmRealViewEbLibRTSM/ArmRealViewEbBoot.S

@@ -20,8 +20,21 @@
 .text
 .align 3
 
+GCC_ASM_EXPORT(ArmPlatformSecBootAction)
 GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)
 
+/**
+  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/ArmRealViewEbPkg/Library/ArmRealViewEbLibRTSM/ArmRealViewEbBoot.asm

@@ -19,11 +19,24 @@
 
   INCLUDE AsmMacroIoLib.inc
 
+  EXPORT  ArmPlatformSecBootAction
   EXPORT  ArmPlatformInitializeBootMemory
 
   PRESERVE8
   AREA    CTA9x4BootMode, CODE, READONLY
 
+/**
+  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
 

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
 

ArmPlatformPkg/Include/Library/ArmPlatformLib.h

@@ -82,6 +82,20 @@ ArmPlatformGetBootMode (
   VOID
   );
 
+/**
+  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
+
+**/
+VOID
+ArmPlatformSecBootAction (
+  VOID
+  );
+
 /**
   Initialize controllers that must setup at the early stage
 

ArmPlatformPkg/Sec/SecEntryPoint.S

@@ -30,6 +30,7 @@ GCC_ASM_EXPORT(_ModuleEntryPoint)
 
 #global functions referenced by this module
 GCC_ASM_IMPORT(CEntryPoint)
+GCC_ASM_IMPORT(ArmPlatformSecBootAction)
 GCC_ASM_IMPORT(ArmPlatformIsMemoryInitialized)
 GCC_ASM_IMPORT(ArmPlatformInitializeBootMemory)
 GCC_ASM_IMPORT(ArmDisableInterrupts)
@@ -46,16 +47,19 @@ StartupAddr:        .word   ASM_PFX(CEntryPoint)
 SecVectorTableAddr: .word		ASM_PFX(SecVectorTable)
 
 ASM_PFX(_ModuleEntryPoint):
- #Set VBAR to the start of the exception vectors in Secure Mode
-  ldr   r0, SecVectorTableAddr
-  bl   ASM_PFX(ArmWriteVBar)
-
   # First ensure all interrupts are disabled
   bl   ASM_PFX(ArmDisableInterrupts)
 
   # Ensure that the MMU and caches are off
   bl  ASM_PFX(ArmDisableCachesAndMmu)
 
+  # Jump to Platform Specific Boot Action function
+  blx   ASM_PFX(ArmPlatformSecBootAction)
+
+  # Set VBAR to the start of the exception vectors in Secure Mode
+  ldr   r0, =SecVectorTable
+  bl    ASM_PFX(ArmWriteVBar)
+
 _IdentifyCpu: 
   # Identify CPU ID
   bl    ASM_PFX(ArmReadMpidr)

ArmPlatformPkg/Sec/SecEntryPoint.asm

@@ -20,6 +20,7 @@
   INCLUDE AsmMacroIoLib.inc
   
   IMPORT  CEntryPoint
+  IMPORT  ArmPlatformSecBootAction
   IMPORT  ArmPlatformIsMemoryInitialized
   IMPORT  ArmPlatformInitializeBootMemory
   IMPORT  ArmDisableInterrupts
@@ -39,16 +40,19 @@
 StartupAddr        DCD      CEntryPoint
 
 _ModuleEntryPoint
-  //Set VBAR to the start of the exception vectors in Secure Mode
-  ldr   r0, =SecVectorTable
-  blx   ArmWriteVBar
-
   // First ensure all interrupts are disabled
   blx   ArmDisableInterrupts
 
   // Ensure that the MMU and caches are off
   blx   ArmDisableCachesAndMmu
 
+  // Jump to Platform Specific Boot Action function
+  blx   ArmPlatformSecBootAction
+
+  // Set VBAR to the start of the exception vectors in Secure Mode
+  ldr   r0, =SecVectorTable
+  blx   ArmWriteVBar
+
 _IdentifyCpu 
   // Identify CPU ID
   bl    ArmReadMpidr