Adding support for BeagleBoard.

ArmPkg - Supoprt for ARM specific things that can change as the architecture changes. Plus semihosting JTAG drivers.
EmbeddedPkg - Generic support for an embeddded platform. Including a light weight command line shell.
BeagleBoardPkg - Platform specifics for BeagleBoard. SD Card works, but USB has issues. Looks like a bug in the open source USB stack (Our internal stack works fine).


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9518 6f19259b-4bc3-4df7-8a09-765794883524

BeagleBoardPkg/Sec/Arm/ModuleEntryPoint.S

@@ -0,0 +1,93 @@
+#------------------------------------------------------------------------------ 
+#
+# Copyright (c) 2008-2009 Apple Inc. All rights reserved.
+#
+# 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 <Library/PcdLib.h>
+
+.text
+.align 3
+
+.globl ASM_PFX(CEntryPoint)
+.globl ASM_PFX(_ModuleEntryPoint)
+
+ASM_PFX(_ModuleEntryPoint):
+
+  //Disable L2 cache
+  mrc     p15, 0, r0, c1, c0, 1   // read Auxiliary Control Register
+  bic     r0, r0, #0x00000002     // disable L2 cache
+  mcr     p15, 0, r0, c1, c0, 1   // store Auxiliary Control Register
+  
+  //Enable Strict alignment checking & Instruction cache
+  mrc     p15, 0, r0, c1, c0, 0
+  bic     r0, r0, #0x00002300     /* clear bits 13, 9:8 (--V- --RS) */
+  bic     r0, r0, #0x00000005     /* clear bits 0, 2 (---- -C-M) */
+  orr     r0, r0, #0x00000002     /* set bit 1 (A) Align */
+  orr     r0, r0, #0x00001000     /* set bit 12 (I) enable I-Cache */
+  mcr     p15, 0, r0, c1, c0, 0
+
+  // Set CPU vectors to start of DRAM
+  mov     r0, #0x80000000
+  mcr     p15, 0, r0, c12, c0, 0
+
+  /* before we call C code, lets setup the stack pointer */
+stack_pointer_setup:
+
+  //
+  // 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
+
+  //Enter IRQ mode and set up IRQ stack pointer
+  mov     r0,#0x12|0x80|0x40
+  msr     CPSR_c,r0
+  mov     r13,r4
+
+  //Enter Abort mode and set up Abort stack pointer
+  mov     r0,#0x17|0x80|0x40
+  msr     CPSR_c,r0
+  sub     r4, r4, #0x400
+  mov     r13,r4
+
+  //Enter Undefined mode and set up Undefined stack pointer
+  mov     r0,#0x1b|0x80|0x40
+  msr     CPSR_c,r0
+  sub     r4, r4, #0x400
+  mov     r13,r4
+
+  //Enter SVC mode and set up SVC stack pointer
+  mov     r0,#0x13|0x80|0x40
+  msr     CPSR_c,r0
+  sub     r4, r4, #0x400
+  mov     r13,r4
+
+  //Enter System mode and set up System stack pointer
+  mov     r0,#0x1f|0x80|0x40
+  msr     CPSR_c,r0
+  sub     r4, r4, #0x400
+  mov     r13,r4
+
+  // Call C entry point
+  mov     r0, #0x80000000   /* memory base arg0          */
+  mov     r1, #0x10000000   /* memory size arg1          */
+
+  bl      ASM_PFX(CEntryPoint) /* Assume C code is ARM      */
+
+ShouldNeverGetHere:
+  /* _CEntryPoint should never return */
+  b       ShouldNeverGetHere
+
+