2 // Copyright (c) 2011-2013, ARM Limited. All rights reserved.
4 // This program and the accompanying materials
5 // are licensed and made available under the terms and conditions of the BSD License
6 // which accompanies this distribution. The full text of the license may be found at
7 // http://opensource.org/licenses/bsd-license.php
9 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14 #include <AsmMacroIoLib.h>
16 #include <Library/PcdLib.h>
19 #include <Chipset/ArmV7.h>
21 INCLUDE AsmMacroIoLib.inc
25 IMPORT ArmPlatformStackSet
27 EXPORT _ModuleEntryPoint
30 AREA PrePiCoreEntryPoint, CODE, READONLY
32 StartupAddr DCD CEntryPoint
35 // Get ID of this CPU in Multicore system
37 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
41 // Enter SVC mode, Disable FIQ and IRQ
42 mov r1, #(CPSR_MODE_SVC :OR: CPSR_IRQ :OR: CPSR_FIQ)
45 // Check if we can install the stack at the top of the System Memory or if we need
46 // to install the stacks at the bottom of the Firmware Device (case the FD is located
47 // at the top of the DRAM)
49 // Compute Top of System Memory
50 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
51 LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
53 add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
55 // Calculate Top of the Firmware Device
56 LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
57 LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
59 add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize
61 // UEFI Memory Size (stacks are allocated in this region)
62 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
65 // Reserve the memory for the UEFI region (contain stacks on its top)
68 // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
69 subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
70 bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
74 // Case the top of stacks is the FdBaseAddress
78 // r1 contains the top of the stack (and the UEFI Memory)
80 // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
81 // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
82 // top of the memory space)
84 bcs _SetupOverflowStack
91 // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
93 LoadConstantToReg (EFI_PAGE_MASK, r7)
98 // Calculate the Base of the UEFI Memory
102 // r1 = The top of the Mpcore Stacks
103 // Stack for the primary core = PrimaryCoreStack
104 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
107 // Stack for the secondary core = Number of Cores - 1
108 LoadConstantToReg (FixedPcdGet32(PcdCoreCount), r0)
110 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r1)
114 // r8 = The base of the MpCore Stacks (primary stack & secondary stacks)
117 //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
118 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
119 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
120 bl ArmPlatformStackSet
122 // Is it the Primary Core ?
123 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
125 bne _PrepareArguments
127 _ReserveGlobalVariable
128 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r0)
129 // InitializePrimaryStack($GlobalVariableSize, $Tmp1)
130 InitializePrimaryStack r0, r1
138 // Move sec startup address into a data register
139 // Ensure we're jumping to FV version of the code (not boot remapped alias)
142 // Jump to PrePiCore C code
144 // r1 = UefiMemoryBase
146 // r3 = GlobalVariableBase