Added a library for the default exception handler and started to add a dissasembler...
[mirror_edk2.git] / BeagleBoardPkg / Sec / Arm / ModuleEntryPoint.asm
1 //------------------------------------------------------------------------------
2 //
3 // Copyright (c) 2008-2009 Apple Inc. All rights reserved.
4 //
5 // All rights reserved. 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
9 //
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.
12 //
13 //------------------------------------------------------------------------------
14
15 #include <AsmMacroIoLib.h>
16 #include <Library/PcdLib.h>
17 #include <AutoGen.h>
18 INCLUDE AsmMacroIoLib.inc
19
20 IMPORT CEntryPoint
21 EXPORT _ModuleEntryPoint
22
23 PRESERVE8
24 AREA ModuleEntryPoint, CODE, READONLY
25
26
27 _ModuleEntryPoint
28
29 //Disable L2 cache
30 mrc p15, 0, r0, c1, c0, 1 // read Auxiliary Control Register
31 bic r0, r0, #0x00000002 // disable L2 cache
32 mcr p15, 0, r0, c1, c0, 1 // store Auxiliary Control Register
33
34 //Enable Strict alignment checking & Instruction cache
35 mrc p15, 0, r0, c1, c0, 0
36 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
37 bic r0, r0, #0x00000005 /* clear bits 0, 2 (---- -C-M) */
38 orr r0, r0, #0x00000002 /* set bit 1 (A) Align */
39 orr r0, r0, #0x00001000 /* set bit 12 (I) enable I-Cache */
40 mcr p15, 0, r0, c1, c0, 0
41
42 // Set CPU vectors to start of DRAM
43 mov r0, #0x80000000
44 mcr p15, 0, r0, c12, c0, 0
45 /* before we call C code, lets setup the stack pointer in internal RAM*/
46 stack_pointer_setup
47
48 //
49 // Set stack based on PCD values. Need to do it this way to make C code work
50 // when it runs from FLASH.
51 //
52 LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) /* stack base arg2 */
53 LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) /* stack size arg3 */
54 add r4, r2, r3
55
56 //Enter SVC mode and set up SVC stack pointer
57 mov r0,#0x13|0x80|0x40
58 msr CPSR_c,r0
59 mov r13,r4
60
61 // Call C entry point
62 mov r0, #0x80000000 /* memory base arg0 */
63 mov r1, #0x10000000 /* memory size arg1 */
64 blx CEntryPoint /* Assume C code is thumb */
65
66 ShouldNeverGetHere
67 /* _CEntryPoint should never return */
68 b ShouldNeverGetHere
69
70 END
71