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 #include <Library/PcdLib.h>
22 GCC_ASM_IMPORT(CEntryPoint)
23 GCC_ASM_IMPORT(ArmPlatformGetCorePosition)
24 GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore)
25 GCC_ASM_IMPORT(ArmReadMpidr)
26 GCC_ASM_IMPORT(ArmPlatformPeiBootAction)
27 GCC_ASM_EXPORT(_ModuleEntryPoint)
29 StartupAddr: .8byte CEntryPoint
31 ASM_PFX(_ModuleEntryPoint):
32 // Do early platform specific actions
33 bl ASM_PFX(ArmPlatformPeiBootAction)
35 // NOTE: We could be booting from EL3, EL2 or EL1. Need to correctly detect
36 // and configure the system accordingly. EL2 is default if possible.
37 // If we started in EL3 we need to switch and run at EL2.
38 // If we are running at EL2 stay in EL2
39 // If we are starting at EL1 stay in EL1.
41 // If started at EL3 Sec is run and switches to EL2 before jumping to PEI.
42 // If started at EL1 or EL2 Sec jumps directly to PEI without making any
45 // Which EL are we running at? Every EL needs some level of setup...
46 // We should not run this code in EL3
48 1:bl ASM_PFX(SetupExceptionLevel1)
49 b ASM_PFX(MainEntryPoint)
50 2:bl ASM_PFX(SetupExceptionLevel2)
51 b ASM_PFX(MainEntryPoint)
53 ASM_PFX(MainEntryPoint):
55 bl ASM_PFX(ArmReadMpidr)
56 // Keep a copy of the MpId register value
59 // Is it the Primary Core ?
60 bl ASM_PFX(ArmPlatformIsPrimaryCore)
62 // Get the top of the primary stacks (and the base of the secondary stacks)
63 LoadConstantToReg (FixedPcdGet32(PcdCPUCoresStackBase), x1)
64 LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)
67 // x0 is equal to 1 if I am the primary core
69 b.eq _SetupPrimaryCoreStack
71 _SetupSecondaryCoreStack:
72 // x1 contains the base of the secondary stacks
74 // Get the Core Position
75 mov x6, x1 // Save base of the secondary stacks
77 bl ASM_PFX(ArmPlatformGetCorePosition)
78 // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
81 // StackOffset = CorePos * StackSize
82 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x2)
84 // SP = StackBase + StackOffset
88 // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
89 LoadConstantToReg (FixedPcdGet64(PcdFvBaseAddress), x2)
93 // Move sec startup address into a data register
94 // Ensure we're jumping to FV version of the code (not boot remapped alias)
97 // Jump to PrePeiCore C code
99 // x1 = pei_core_address
103 _SetupPrimaryCoreStack:
104 // x1 contains the top of the primary stack
105 LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), x2)
107 // The reserved space for global variable must be 16-bytes aligned for pushing
108 // 128-bit variable on the stack
109 SetPrimaryStack (x1, x2, x3, x4)