2 // Copyright (c) 2011, 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>
22 GCC_ASM_IMPORT(CEntryPoint)
23 GCC_ASM_IMPORT(ArmReadMpidr)
24 GCC_ASM_IMPORT(ArmIsMPCore)
25 GCC_ASM_EXPORT(_ModuleEntryPoint)
27 StartupAddr: .word CEntryPoint
30 ASM_PFX(_ModuleEntryPoint):
31 // Get ID of this CPU in Multicore system
32 bl ASM_PFX(ArmReadMpidr)
33 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
38 mov r1, #0x13|0x80|0x40
41 // Check if we can install the stack at the top of the System Memory or if we need
42 // to install the stacks at the bottom of the Firmware Device (case the FD is located
43 // at the top of the DRAM)
45 // Compute Top of System Memory
46 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
47 LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
48 add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
50 // Calculate Top of the Firmware Device
51 LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
52 LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
53 add r3, r3, r2 // r4 = FdTop = PcdFdBaseAddress + PcdFdSize
55 // UEFI Memory Size (stacks are allocated in this region)
56 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
59 // Reserve the memory for the UEFI region (contain stacks on its top)
62 // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
63 subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
64 bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
68 // Case the top of stacks is the FdBaseAddress
72 // r1 contains the top of the stack (and the UEFI Memory)
74 // Calculate the Base of the UEFI Memory
78 // Compute Base of Normal stacks for CPU Cores
79 // Is it MpCore system
82 // Case it is not an MP Core system. Just setup the primary core
83 beq _SetupUnicoreStack
86 // Stack for the primary core = PrimaryCoreStack
87 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
89 // Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize
90 LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)
92 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
96 // The top of the Mpcore Stacks is in r1
97 // The base of the MpCore Stacks is in r7
99 // Is it the Primary Core ?
100 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
102 beq _SetupPrimaryCoreStack
104 _SetupSecondaryCoreStack:
105 // Base of the stack for the secondary cores is in r7
107 // Get the position of the cores (ClusterId * 4) + CoreId
108 GetCorePositionInStack(r0, r5, r4)
109 // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
111 // Get the offset for the Secondary Stack
115 bne _PrepareArguments
117 _SetupPrimaryCoreStack:
118 // The top of the Mpcore Stacks is in r1
119 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
121 // The reserved space for global variable must be 8-bytes aligned for pushing
122 // 64-bit variable on the stack
123 SetPrimaryStack (r1, r2, r3)
126 // Set all the PrePi global variables to 0
141 // Move sec startup address into a data register
142 // Ensure we're jumping to FV version of the code (not boot remapped alias)
145 // Jump to PrePiCore C code
147 // r1 = UefiMemoryBase
149 // r3 = GlobalVariableBase
156 // The top of the Unicore Stack is in r1
157 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
158 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)
160 // Calculate the bottom of the primary stack (StackBase)
163 // The reserved space for global variable must be 8-bytes aligned for pushing
164 // 64-bit variable on the stack
165 SetPrimaryStack (r1, r2, r3)