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| author | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-02-01 05:41:42 +0000 |
|---|---|---|
| committer | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-02-01 05:41:42 +0000 |
| commit | 1d5d0ae92d95410f20bc6daab7a47e129fb2547a (patch) | |
| tree | 8679c57c5f85cadad47d4604450c1c3702276cf1 /ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S | |
| parent | fb334ef6c543b1babc9d8a613ad5d1ce6fe536e1 (diff) | |
| download | edk2-platforms-1d5d0ae92d95410f20bc6daab7a47e129fb2547a.tar.xz | |
Add ArmPlatformPkg from ARM Ltd. patch.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11291 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S')
| -rw-r--r-- | ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S new file mode 100644 index 0000000000..f18d0569fd --- /dev/null +++ b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA9x4/CTA9x4Helper.S @@ -0,0 +1,74 @@ +#------------------------------------------------------------------------------
+#
+# ARM VE Entry point. Reset vector in FV header will brach to
+# _ModuleEntryPoint.
+#
+# We use crazy macros, like LoadConstantToReg, since Xcode assembler
+# does not support = assembly syntax for ldr.
+#
+# Copyright (c) 2011, ARM Limited. All rights reserved.
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+#include <AsmMacroIoLib.h>
+#include <Base.h>
+#include <Library/PcdLib.h>
+#include <Library/ArmPlatformLib.h>
+#include <AutoGen.h>
+
+#Start of Code section
+.text
+.align 3
+
+GCC_ASM_EXPORT(ArmPlatformIsMemoryInitialized)
+GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)
+.extern ASM_PFX(InitializeSMC)
+
+/**
+ Called at the early stage of the Boot phase to know if the memory has already been initialized
+
+ Running the code from the reset vector does not mean we start from cold boot. In some case, we
+ can go through this code with the memory already initialized.
+ Because this function is called at the early stage, the implementation must not use the stack.
+ Its implementation must probably done in assembly to ensure this requirement.
+
+ @return Return the condition value into the 'Z' flag
+
+**/
+ASM_PFX(ArmPlatformIsMemoryInitialized):
+ // Check if the memory has been already mapped, if so skipped the memory initialization
+ LoadConstantToReg (ARM_VE_SYS_CFGRW1_REG ,r0)
+ ldr r0, [r0, #0]
+
+ // 0x40000000 = Value of Physical Configuration Switch SW[0]
+ and r0, r0, #0x40000000
+ tst r0, #0x40000000
+ bx lr
+
+/**
+ Initialize the memory where the initial stacks will reside
+
+ This memory can contain the initial stacks (Secure and Secure Monitor stacks).
+ In some platform, this region is already initialized and the implementation of this function can
+ do nothing. This memory can also represent the Secure RAM.
+ This function is called before the satck has been set up. Its implementation must ensure the stack
+ pointer is not used (probably required to use assembly language)
+
+**/
+ASM_PFX(ArmPlatformInitializeBootMemory):
+ mov r5, lr
+ // Initialize PL354 SMC
+ LoadConstantToReg (ARM_VE_SMC_CTRL_BASE, r1)
+ LoadConstantToReg (ARM_VE_SMB_PERIPH_VRAM, r2)
+ blx ASM_PFX(InitializeSMC)
+ bx r5
+
+.end
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