| #------------------------------------------------------------------------------ | |
| # | |
| # 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 | |