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 <AsmMacroIoLibV8.h>
16 ASM_FUNC(_ModuleEntryPoint)
17 // Do early platform specific actions
18 bl ASM_PFX(ArmPlatformPeiBootAction)
20 // NOTE: We could be booting from EL3, EL2 or EL1. Need to correctly detect
21 // and configure the system accordingly. EL2 is default if possible.
22 // If we started in EL3 we need to switch and run at EL2.
23 // If we are running at EL2 stay in EL2
24 // If we are starting at EL1 stay in EL1.
26 // If started at EL3 Sec is run and switches to EL2 before jumping to PEI.
27 // If started at EL1 or EL2 Sec jumps directly to PEI without making any
30 // Which EL are we running at? Every EL needs some level of setup...
31 // We should not run this code in EL3
33 1:bl ASM_PFX(SetupExceptionLevel1)
34 b ASM_PFX(MainEntryPoint)
35 2:bl ASM_PFX(SetupExceptionLevel2)
36 b ASM_PFX(MainEntryPoint)
38 ASM_PFX(MainEntryPoint):
40 bl ASM_PFX(ArmReadMpidr)
41 // Keep a copy of the MpId register value
44 // Is it the Primary Core ?
45 bl ASM_PFX(ArmPlatformIsPrimaryCore)
47 // Get the top of the primary stacks (and the base of the secondary stacks)
48 MOV64 (x1, FixedPcdGet64(PcdCPUCoresStackBase) + FixedPcdGet32(PcdCPUCorePrimaryStackSize))
50 // x0 is equal to 1 if I am the primary core
52 b.eq _SetupPrimaryCoreStack
54 _SetupSecondaryCoreStack:
55 // x1 contains the base of the secondary stacks
57 // Get the Core Position
58 mov x6, x1 // Save base of the secondary stacks
60 bl ASM_PFX(ArmPlatformGetCorePosition)
61 // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
64 // StackOffset = CorePos * StackSize
65 MOV32 (x2, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
67 // SP = StackBase + StackOffset
71 // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
72 MOV64 (x2, FixedPcdGet64(PcdFvBaseAddress))
75 // Move sec startup address into a data register
76 // Ensure we're jumping to FV version of the code (not boot remapped alias)
77 ldr x3, =ASM_PFX(CEntryPoint)
79 // Jump to PrePeiCore C code
81 // x1 = pei_core_address
85 _SetupPrimaryCoreStack: