mirror of https://github.com/acidanthera/audk.git
69 lines
2.5 KiB
ArmAsm
69 lines
2.5 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# ARM EB Entry point. Reset vector in FV header will brach to
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# _ModuleEntryPoint.
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#
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# We use crazy macros, like LoadConstantToReg, since Xcode assembler
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# does not support = assembly syntax for ldr.
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#
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# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#------------------------------------------------------------------------------
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#include <AsmMacroIoLib.h>
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#include <Base.h>
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#include <Library/PcdLib.h>
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#include <ArmEb/ArmEb.h>
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.text
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.align 3
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.globl ASM_PFX(CEntryPoint)
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.globl ASM_PFX(_ModuleEntryPoint)
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ASM_PFX(_ModuleEntryPoint):
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// Turn off remapping NOR to 0. We can now use DRAM in low memory
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// CAN'T DO THIS HERE -- BRANCH FROM RESET VECTOR IS RELATIVE AND REMAINS IN REMAPPED NOR
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//MmioOr32 (EB_SP810_CTRL_BASE ,BIT8)
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// Enable NEON register in case folks want to use them for optimizations (CopyMem)
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mrc p15, 0, r0, c1, c0, 2
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orr r0, r0, #0x00f00000 // Enable VPF access (V* instructions)
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mcr p15, 0, r0, c1, c0, 2
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mov r0, #0x40000000 // Set EN bit in FPEXC
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mcr p10,#0x7,r0,c8,c0,#0 // msr FPEXC,r0 in ARM assembly
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// Set CPU vectors to 0 (which is currently flash)
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LoadConstantToReg (FixedPcdGet32(PcdCpuVectorBaseAddress) ,r0) // Get vector base
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mcr p15, 0, r0, c12, c0, 0
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isb // Sync changes to control registers
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//
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// Set stack based on PCD values. Need to do it this way to make C code work
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// when it runs from FLASH.
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//
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LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) // stack base arg2
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LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) // stack size arg3
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add r4, r2, r3
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mov r13, r4
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// Call C entry point
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LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1) // memory size arg1
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LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0) // memory size arg0
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blx ASM_PFX(CEntryPoint)
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ShouldNeverGetHere:
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// _CEntryPoint should never return
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b ShouldNeverGetHere
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