2 // Copyright (c) 2011-2015, 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 <AsmMacroIoLibV8.h>
16 ASM_FUNC(_ModuleEntryPoint)
17 // Do early platform specific actions
18 bl ASM_PFX(ArmPlatformPeiBootAction)
20 // Get ID of this CPU in Multicore system
21 bl ASM_PFX(ArmReadMpidr)
22 // Keep a copy of the MpId register value
26 // Check if we can install the stack at the top of the System Memory or if we need
27 // to install the stacks at the bottom of the Firmware Device (case the FD is located
28 // at the top of the DRAM)
30 ldr x1, mSystemMemoryEnd
33 // r1 = SystemMemoryTop
35 // Calculate Top of the Firmware Device
36 MOV64 (x2, FixedPcdGet64(PcdFdBaseAddress))
37 MOV32 (x3, FixedPcdGet32(PcdFdSize) - 1)
39 add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize
41 // UEFI Memory Size (stacks are allocated in this region)
42 MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))
45 // Reserve the memory for the UEFI region (contain stacks on its top)
48 // Calculate how much space there is between the top of the Firmware and the Top of the System Memory
49 subs x0, x1, x3 // x0 = SystemMemoryTop - FdTop
50 b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
54 // Case the top of stacks is the FdBaseAddress
58 // x1 contains the top of the stack (and the UEFI Memory)
60 // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
61 // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
62 // top of the memory space)
64 b.cs _SetupOverflowStack
71 // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
73 and x1, x1, ~EFI_PAGE_MASK
76 // Calculate the Base of the UEFI Memory
80 // r1 = The top of the Mpcore Stacks
81 // Stack for the primary core = PrimaryCoreStack
82 MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
85 // Stack for the secondary core = Number of Cores - 1
86 MOV32 (x1, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
89 // x12 = The base of the MpCore Stacks (primary stack & secondary stacks)
92 //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
93 MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
94 MOV32 (x3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
95 bl ASM_PFX(ArmPlatformStackSet)
97 // Is it the Primary Core ?
99 bl ASM_PFX(ArmPlatformIsPrimaryCore)
101 bne _PrepareArguments
108 // Move sec startup address into a data register
109 // Ensure we're jumping to FV version of the code (not boot remapped alias)
110 ldr x4, =ASM_PFX(CEntryPoint)
112 // Jump to PrePiCore C code
114 // x1 = UefiMemoryBase