mirror of https://github.com/acidanthera/audk.git
85 lines
2.8 KiB
ArmAsm
85 lines
2.8 KiB
ArmAsm
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//
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// Copyright (c) 2011, ARM Limited. All rights reserved.
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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 <AutoGen.h>
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#start of the code section
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.text
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.align 3
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#global symbols referenced by this module
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GCC_ASM_IMPORT(CEntryPoint)
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StartupAddr: .word CEntryPoint
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#make _ModuleEntryPoint as global
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GCC_ASM_EXPORT(_ModuleEntryPoint)
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ASM_PFX(_ModuleEntryPoint):
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// Identify CPU ID
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mrc p15, 0, r0, c0, c0, 5
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and r0, #0xf
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_UefiMemoryBase:
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#if FixedPcdGet32(PcdStandalone)
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// Compute Top of System Memory
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
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add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
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#else
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// If it is not a Standalone, we must compute the top of the UEFI memory with the base of the FD
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LoadConstantToReg (FixedPcdGet32(PcdNormalFdBaseAddress), r1)
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#endif
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// Compute Base of UEFI Memory
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LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r2)
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sub r1, r1, r2 // r1 = SystemMemoryTop - PcdSystemMemoryUefiRegionSize = UefiMemoryBase
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_SetupStack:
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// Compute Base of Normal stacks for CPU Cores
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LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r2)
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mul r3, r0, r2 // r3 = core_id * stack_size = offset from the stack base
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sub sp, r1, r3 // r3 = UefiMemoryBase - StackOffset = TopOfStack
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// Only allocate memory in top of the primary core stack
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cmp r0, #0
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bne _PrepareArguments
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_AllocateGlobalPeiVariables:
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// Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)
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LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r4)
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// The reserved place must be 8-bytes aligned for pushing 64-bit variable on the stack
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and r5, r4, #7
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rsb r5, r5, #8
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add r4, r4, r5
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sub sp, sp, r4
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_PrepareArguments:
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// Pass the StackBase to the C Entrypoint (UefiMemoryBase - StackSize - StackOffset)
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sub r2, r1, r2
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sub r2, r3
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// Move sec startup address into a data register
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// Ensure we're jumping to FV version of the code (not boot remapped alias)
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ldr r3, StartupAddr
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// jump to PrePiCore C code
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// r0 = core_id
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// r1 = UefiMemoryBase
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// r2 = StackBase
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blx r3
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