diff options
Diffstat (limited to 'ArmPlatformPkg/ArmRealViewEbPkg/Pei/ModuleEntryPoint.S')
-rw-r--r-- | ArmPlatformPkg/ArmRealViewEbPkg/Pei/ModuleEntryPoint.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/ArmPlatformPkg/ArmRealViewEbPkg/Pei/ModuleEntryPoint.S b/ArmPlatformPkg/ArmRealViewEbPkg/Pei/ModuleEntryPoint.S new file mode 100644 index 0000000000..2b5ee8f31a --- /dev/null +++ b/ArmPlatformPkg/ArmRealViewEbPkg/Pei/ModuleEntryPoint.S @@ -0,0 +1,68 @@ +#------------------------------------------------------------------------------
+#
+# ARM EB 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) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+#
+# 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 <ArmEb/ArmEb.h>
+
+.text
+.align 3
+
+.globl ASM_PFX(CEntryPoint)
+.globl ASM_PFX(_ModuleEntryPoint)
+
+ASM_PFX(_ModuleEntryPoint):
+
+ // Turn off remapping NOR to 0. We can now use DRAM in low memory
+ // CAN'T DO THIS HERE -- BRANCH FROM RESET VECTOR IS RELATIVE AND REMAINS IN REMAPPED NOR
+ //MmioOr32 (EB_SP810_CTRL_BASE ,BIT8)
+
+ // Enable NEON register in case folks want to use them for optimizations (CopyMem)
+ mrc p15, 0, r0, c1, c0, 2
+ orr r0, r0, #0x00f00000 // Enable VPF access (V* instructions)
+ mcr p15, 0, r0, c1, c0, 2
+ mov r0, #0x40000000 // Set EN bit in FPEXC
+ mcr p10,#0x7,r0,c8,c0,#0 // msr FPEXC,r0 in ARM assembly
+
+ // Set CPU vectors to 0 (which is currently flash)
+ LoadConstantToReg (FixedPcdGet32(PcdCpuVectorBaseAddress) ,r0) // Get vector base
+ mcr p15, 0, r0, c12, c0, 0
+ isb // Sync changes to control registers
+
+ //
+ // Set stack based on PCD values. Need to do it this way to make C code work
+ // when it runs from FLASH.
+ //
+ LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) // stack base arg2
+ LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) // stack size arg3
+ add r4, r2, r3
+ mov r13, r4
+
+ // Call C entry point
+ LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1) // memory size arg1
+ LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0) // memory size arg0
+ blx ASM_PFX(CEntryPoint)
+
+ShouldNeverGetHere:
+ // _CEntryPoint should never return
+ b ShouldNeverGetHere
+
+
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