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>
19 INCLUDE AsmMacroIoLib.inc
24 EXPORT _ModuleEntryPoint
27 AREA PrePiCoreEntryPoint, CODE, READONLY
29 StartupAddr DCD CEntryPoint
32 // Get ID of this CPU in Multicore system
34 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
38 // Enter SVC mode, Disable FIQ and IRQ
39 mov r1, #0x13|0x80|0x40
42 // Check if we can install the stack at the top of the System Memory or if we need
43 // to install the stacks at the bottom of the Firmware Device (case the FD is located
44 // at the top of the DRAM)
46 // Compute Top of System Memory
47 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)
48 LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)
49 add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
51 // Calculate Top of the Firmware Device
52 LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)
53 LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)
54 add r3, r3, r2 // r4 = FdTop = PcdFdBaseAddress + PcdFdSize
56 // UEFI Memory Size (stacks are allocated in this region)
57 LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)
60 // Reserve the memory for the UEFI region (contain stacks on its top)
63 // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
64 subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
65 bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
69 // Case the top of stacks is the FdBaseAddress
73 // r1 contains the top of the stack (and the UEFI Memory)
75 // Calculate the Base of the UEFI Memory
79 // Compute Base of Normal stacks for CPU Cores
80 // Is it MpCore system
83 // Case it is not an MP Core system. Just setup the primary core
84 beq _SetupUnicoreStack
87 // Stack for the primary core = PrimaryCoreStack
88 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
90 // Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize
91 LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)
93 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
97 // The top of the Mpcore Stacks is in r1
98 // The base of the MpCore Stacks is in r7
100 // Is it the Primary Core ?
101 LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
103 beq _SetupPrimaryCoreStack
105 _SetupSecondaryCoreStack
106 // Base of the stack for the secondary cores is in r7
108 // Get the position of the cores (ClusterId * 4) + CoreId
109 GetCorePositionInStack(r0, r5, r4)
110 // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
112 // Get the offset for the Secondary Stack
116 bne _PrepareArguments
118 _SetupPrimaryCoreStack
119 // The top of the Mpcore Stacks is in r1
120 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
122 // The reserved space for global variable must be 8-bytes aligned for pushing
123 // 64-bit variable on the stack
124 SetPrimaryStack (r1, r2, r3)
127 // Set all the PrePi global variables to 0
132 beq _PrepareArguments
142 // Move sec startup address into a data register
143 // Ensure we're jumping to FV version of the code (not boot remapped alias)
146 // Jump to PrePiCore C code
148 // r1 = UefiMemoryBase
150 // r3 = GlobalVariableBase
157 // The top of the Unicore Stack is in r1
158 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
159 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)
161 // Calculate the bottom of the primary stack (StackBase)
164 // The reserved space for global variable must be 8-bytes aligned for pushing
165 // 64-bit variable on the stack
166 SetPrimaryStack (r1, r2, r3)