1 //------------------------------------------------------------------------------
3 // Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
5 // This program and the accompanying materials
6 // are licensed and made available under the terms and conditions of the BSD License
7 // which accompanies this distribution. The full text of the license may be found at
8 // http://opensource.org/licenses/bsd-license.php
10 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13 //------------------------------------------------------------------------------
15 #include <AsmMacroIoLib.h>
17 #include <Library/PcdLib.h>
18 #include <ArmEb/ArmEb.h>
21 INCLUDE AsmMacroIoLib.inc
24 EXPORT _ModuleEntryPoint
27 AREA ModuleEntryPoint, CODE, READONLY
30 StartupAddr DCD CEntryPoint
34 // Turn off remapping NOR to 0. We can now use DRAM in low memory
35 // CAN'T DO THIS HERE -- BRANCH FROM RESET VECTOR IS RELATIVE AND REMAINS IN REMAPPED NOR
36 //MmioOr32 (0x10001000 ,BIT8) //EB_SP810_CTRL_BASE
38 // Enable NEON register in case folks want to use them for optimizations (CopyMem)
39 mrc p15, 0, r0, c1, c0, 2
40 orr r0, r0, #0x00f00000 // Enable VFP access (V* instructions)
41 mcr p15, 0, r0, c1, c0, 2
42 mov r0, #0x40000000 // Set EN bit in FPEXC
43 mcr p10,#0x7,r0,c8,c0,#0 // msr FPEXC,r0 in ARM assembly
45 // Set CPU vectors to 0 (which is currently flash)
46 LoadConstantToReg (FixedPcdGet32(PcdCpuVectorBaseAddress) ,r0) // Get vector base
47 mcr p15, 0, r0, c12, c0, 0
48 isb // Sync changes to control registers
51 // Set stack based on PCD values. Need to do it this way to make C code work
52 // when it runs from FLASH.
54 LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) // stack base arg2
55 LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) // stack size arg3
59 LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1) // memory size arg1
60 LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0) // memory size arg0
62 // move sec startup address into a data register
63 // ensure we're jumping to FV version of the code (not boot remapped alias)
70 // THIS DOESN'T WORK, WE NEED A LONG JUMP
75 // _CEntryPoint should never return