1// 2// Copyright (c) 2011-2014, ARM Limited. All rights reserved. 3// 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 8// 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. 11// 12// 13 14#include <AutoGen.h> 15#include <AsmMacroIoLibV8.h> 16#include "SecInternal.h" 17 18.text 19.align 3 20 21GCC_ASM_IMPORT(CEntryPoint) 22GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore) 23GCC_ASM_IMPORT(ArmPlatformGetCorePosition) 24GCC_ASM_IMPORT(ArmPlatformSecBootAction) 25GCC_ASM_IMPORT(ArmPlatformSecBootMemoryInit) 26GCC_ASM_IMPORT(ArmDisableInterrupts) 27GCC_ASM_IMPORT(ArmDisableCachesAndMmu) 28GCC_ASM_IMPORT(ArmReadMpidr) 29GCC_ASM_IMPORT(ArmCallWFE) 30GCC_ASM_EXPORT(_ModuleEntryPoint) 31 32StartupAddr: .8byte ASM_PFX(CEntryPoint) 33 34ASM_PFX(_ModuleEntryPoint): 35 36// NOTE: We could be booting from EL3, EL2 or EL1. Need to correctly detect 37// and configure the system accordingly. EL2 is default if possible. 38// If we started in EL3 we need to switch and run at EL2. 39// If we are running at EL2 stay in EL2 40// If we are starting at EL1 stay in EL1. 41 42// Sec only runs in EL3. Othewise we jump to PEI without changing anything. 43// If Sec runs we change to EL2 before switching to PEI. 44 45// Which EL are we running at? Every EL needs some level of setup... 46 EL1_OR_EL2_OR_EL3(x0) 471:// If we are at EL1 or EL2 leave SEC for PEI. 482:b ASM_PFX(JumpToPEI) 49 // If we are at EL3 we need to configure it and switch to EL2 503:b ASM_PFX(MainEntryPoint) 51 52ASM_PFX(MainEntryPoint): 53 // First ensure all interrupts are disabled 54 bl ASM_PFX(ArmDisableInterrupts) 55 56 // Ensure that the MMU and caches are off 57 bl ASM_PFX(ArmDisableCachesAndMmu) 58 59 // By default, we are doing a cold boot 60 mov x10, #ARM_SEC_COLD_BOOT 61 62 // Jump to Platform Specific Boot Action function 63 bl ASM_PFX(ArmPlatformSecBootAction) 64 65_IdentifyCpu: 66 // Identify CPU ID 67 bl ASM_PFX(ArmReadMpidr) 68 // Keep a copy of the MpId register value 69 mov x5, x0 70 71 // Is it the Primary Core ? 72 bl ASM_PFX(ArmPlatformIsPrimaryCore) 73 cmp x0, #1 74 // Only the primary core initialize the memory (SMC) 75 b.eq _InitMem 76 77_WaitInitMem: 78 // If we are not doing a cold boot in this case we should assume the Initial Memory to be already initialized 79 // Otherwise we have to wait the Primary Core to finish the initialization 80 cmp x10, #ARM_SEC_COLD_BOOT 81 b.ne _SetupSecondaryCoreStack 82 83 // Wait for the primary core to initialize the initial memory (event: BOOT_MEM_INIT) 84 bl ASM_PFX(ArmCallWFE) 85 // Now the Init Mem is initialized, we setup the secondary core stacks 86 b _SetupSecondaryCoreStack 87 88_InitMem: 89 // If we are not doing a cold boot in this case we should assume the Initial Memory to be already initialized 90 cmp x10, #ARM_SEC_COLD_BOOT 91 b.ne _SetupPrimaryCoreStack 92 93 // Initialize Init Boot Memory 94 bl ASM_PFX(ArmPlatformSecBootMemoryInit) 95 96_SetupPrimaryCoreStack: 97 // Get the top of the primary stacks (and the base of the secondary stacks) 98 LoadConstantToReg (FixedPcdGet32(PcdCPUCoresSecStackBase), x1) 99 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecPrimaryStackSize), x2) 100 add x1, x1, x2 101 102 mov sp, x1 103 b _PrepareArguments 104 105_SetupSecondaryCoreStack: 106 // Get the top of the primary stacks (and the base of the secondary stacks) 107 LoadConstantToReg (FixedPcdGet32(PcdCPUCoresSecStackBase), x1) 108 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecPrimaryStackSize), x2) 109 add x6, x1, x2 110 111 // Get the Core Position 112 mov x0, x5 113 bl ASM_PFX(ArmPlatformGetCorePosition) 114 // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack 115 add x0, x0, #1 116 117 // StackOffset = CorePos * StackSize 118 LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecSecondaryStackSize), x2) 119 mul x0, x0, x2 120 // SP = StackBase + StackOffset 121 add sp, x6, x0 122 123_PrepareArguments: 124 // Move sec startup address into a data register 125 // Ensure we're jumping to FV version of the code (not boot remapped alias) 126 ldr x3, StartupAddr 127 128 // Jump to SEC C code 129 // r0 = mp_id 130 // r1 = Boot Mode 131 mov x0, x5 132 mov x1, x10 133 blr x3 134 135 ret 136 137ASM_PFX(JumpToPEI): 138 LoadConstantToReg (FixedPcdGet32(PcdFvBaseAddress), x0) 139 blr x0 140