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//
// Copyright (c) 2011-2014, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution. The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//
#include <AsmMacroIoLibV8.h>
ASM_FUNC(_ModuleEntryPoint)
// Do early platform specific actions
bl ASM_PFX(ArmPlatformPeiBootAction)
// NOTE: We could be booting from EL3, EL2 or EL1. Need to correctly detect
// and configure the system accordingly. EL2 is default if possible.
// If we started in EL3 we need to switch and run at EL2.
// If we are running at EL2 stay in EL2
// If we are starting at EL1 stay in EL1.
// If started at EL3 Sec is run and switches to EL2 before jumping to PEI.
// If started at EL1 or EL2 Sec jumps directly to PEI without making any
// changes.
// Which EL are we running at? Every EL needs some level of setup...
// We should not run this code in EL3
EL1_OR_EL2(x0)
1:bl ASM_PFX(SetupExceptionLevel1)
b ASM_PFX(MainEntryPoint)
2:bl ASM_PFX(SetupExceptionLevel2)
b ASM_PFX(MainEntryPoint)
ASM_PFX(MainEntryPoint):
// Identify CPU ID
bl ASM_PFX(ArmReadMpidr)
// Keep a copy of the MpId register value
mov x5, x0
// Is it the Primary Core ?
bl ASM_PFX(ArmPlatformIsPrimaryCore)
// Get the top of the primary stacks (and the base of the secondary stacks)
MOV64 (x1, FixedPcdGet64(PcdCPUCoresStackBase) + FixedPcdGet32(PcdCPUCorePrimaryStackSize))
// x0 is equal to 1 if I am the primary core
cmp x0, #1
b.eq _SetupPrimaryCoreStack
_SetupSecondaryCoreStack:
// x1 contains the base of the secondary stacks
// Get the Core Position
mov x6, x1 // Save base of the secondary stacks
mov x0, x5
bl ASM_PFX(ArmPlatformGetCorePosition)
// The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
add x0, x0, #1
// StackOffset = CorePos * StackSize
MOV32 (x2, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
mul x0, x0, x2
// SP = StackBase + StackOffset
add sp, x6, x0
_PrepareArguments:
// The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
MOV64 (x2, FixedPcdGet64(PcdFvBaseAddress))
ldr x1, [x2, #8]
// Move sec startup address into a data register
// Ensure we're jumping to FV version of the code (not boot remapped alias)
ldr x3, =ASM_PFX(CEntryPoint)
// Set the frame pointer to NULL so any backtraces terminate here
mov x29, xzr
// Jump to PrePeiCore C code
// x0 = mp_id
// x1 = pei_core_address
mov x0, x5
blr x3
_SetupPrimaryCoreStack:
mov sp, x1
MOV64 (x8, FixedPcdGet64 (PcdCPUCoresStackBase))
MOV64 (x9, FixedPcdGet32 (PcdInitValueInTempStack) |\
FixedPcdGet32 (PcdInitValueInTempStack) << 32)
0:stp x9, x9, [x8], #16
cmp x8, x1
b.lt 0b
b _PrepareArguments
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