2 // Copyright (c) 2011-2014, 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
24 IMPORT ArmPlatformIsPrimaryCore
26 IMPORT ArmPlatformPeiBootAction
27 IMPORT ArmPlatformStackSet
29 EXPORT _ModuleEntryPoint
32 AREA PrePiCoreEntryPoint, CODE, READONLY
34 StartupAddr DCD CEntryPoint
37 // Do early platform specific actions
38 bl ArmPlatformPeiBootAction
40 // Get ID of this CPU in Multicore system
42 // Keep a copy of the MpId register value
46 // Enter SVC mode, Disable FIQ and IRQ
47 mov r1, #(CPSR_MODE_SVC :OR: CPSR_IRQ :OR: CPSR_FIQ)
50 // Check if we can install the stack at the top of the System Memory or if we need
51 // to install the stacks at the bottom of the Firmware Device (case the FD is located
52 // at the top of the DRAM)
54 // Compute Top of System Memory
55 LoadConstantToReg (FixedPcdGet64 (PcdSystemMemoryBase), r1)
56 LoadConstantToReg (FixedPcdGet64 (PcdSystemMemorySize), r2)
58 add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
60 // Calculate Top of the Firmware Device
61 LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
62 LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
64 add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize
66 // UEFI Memory Size (stacks are allocated in this region)
67 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
70 // Reserve the memory for the UEFI region (contain stacks on its top)
73 // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
74 subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
75 bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
79 // Case the top of stacks is the FdBaseAddress
83 // r1 contains the top of the stack (and the UEFI Memory)
85 // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
86 // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
87 // top of the memory space)
89 bcs _SetupOverflowStack
96 // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
98 LoadConstantToReg (EFI_PAGE_MASK, r9)
103 // Calculate the Base of the UEFI Memory
107 // r1 = The top of the Mpcore Stacks
108 // Stack for the primary core = PrimaryCoreStack
109 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
112 // Stack for the secondary core = Number of Cores - 1
113 LoadConstantToReg (FixedPcdGet32(PcdCoreCount), r0)
115 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r1)
119 // r10 = The base of the MpCore Stacks (primary stack & secondary stacks)
122 //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
123 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
124 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
125 bl ArmPlatformStackSet
127 // Is it the Primary Core ?
129 bl ArmPlatformIsPrimaryCore
131 bne _PrepareArguments
133 _ReserveGlobalVariable
134 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r0)
135 // InitializePrimaryStack($GlobalVariableSize, $Tmp1)
136 InitializePrimaryStack r0, r1
144 // Move sec startup address into a data register
145 // Ensure we're jumping to FV version of the code (not boot remapped alias)
148 // Jump to PrePiCore C code
150 // r1 = UefiMemoryBase
152 // r3 = GlobalVariableBase