eaa84fd553
Several assembler macros use a loop at the label "dead" to trap an error. This is difficult to debug as there is no indication of how one arrived at the loop. This change replaces dead with distinct loops locally in the macro, which means the cause of the hang is detectable to the debugger. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15273 6f19259b-4bc3-4df7-8a09-765794883524
111 lines
3.6 KiB
ArmAsm
111 lines
3.6 KiB
ArmAsm
//
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// Copyright (c) 2011-2014, ARM Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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//
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#include <AsmMacroIoLibV8.h>
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#include <Base.h>
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#include <Library/PcdLib.h>
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#include <AutoGen.h>
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.text
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.align 3
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GCC_ASM_IMPORT(CEntryPoint)
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GCC_ASM_IMPORT(ArmPlatformGetCorePosition)
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GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore)
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GCC_ASM_IMPORT(ArmReadMpidr)
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GCC_ASM_IMPORT(ArmPlatformPeiBootAction)
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GCC_ASM_EXPORT(_ModuleEntryPoint)
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StartupAddr: .dword CEntryPoint
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ASM_PFX(_ModuleEntryPoint):
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// Do early platform specific actions
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bl ASM_PFX(ArmPlatformPeiBootAction)
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// NOTE: We could be booting from EL3, EL2 or EL1. Need to correctly detect
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// and configure the system accordingly. EL2 is default if possible.
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// If we started in EL3 we need to switch and run at EL2.
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// If we are running at EL2 stay in EL2
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// If we are starting at EL1 stay in EL1.
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// If started at EL3 Sec is run and switches to EL2 before jumping to PEI.
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// If started at EL1 or EL2 Sec jumps directly to PEI without making any
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// changes.
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// Which EL are we running at? Every EL needs some level of setup...
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// We should not run this code in EL3
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EL1_OR_EL2(x0)
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1:bl ASM_PFX(SetupExceptionLevel1)
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b ASM_PFX(MainEntryPoint)
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2:bl ASM_PFX(SetupExceptionLevel2)
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b ASM_PFX(MainEntryPoint)
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ASM_PFX(MainEntryPoint):
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// Identify CPU ID
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bl ASM_PFX(ArmReadMpidr)
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// Keep a copy of the MpId register value
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mov x5, x0
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// Is it the Primary Core ?
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bl ASM_PFX(ArmPlatformIsPrimaryCore)
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// Get the top of the primary stacks (and the base of the secondary stacks)
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LoadConstantToReg (FixedPcdGet32(PcdCPUCoresStackBase), x1)
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LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), x2)
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add x1, x1, x2
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// x0 is equal to 1 if I am the primary core
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cmp x0, #1
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b.eq _SetupPrimaryCoreStack
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_SetupSecondaryCoreStack:
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// x1 contains the base of the secondary stacks
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// Get the Core Position
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mov x6, x1 // Save base of the secondary stacks
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mov x0, x5
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bl ASM_PFX(ArmPlatformGetCorePosition)
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// The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
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add x0, x0, #1
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// StackOffset = CorePos * StackSize
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LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), x2)
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mul x0, x0, x2
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// SP = StackBase + StackOffset
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add sp, x6, x0
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_PrepareArguments:
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// The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
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LoadConstantToReg (FixedPcdGet64(PcdFvBaseAddress), x2)
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add x2, x2, #8
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ldr x1, [x2]
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// Move sec startup address into a data register
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// Ensure we're jumping to FV version of the code (not boot remapped alias)
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ldr x3, StartupAddr
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// Jump to PrePeiCore C code
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// x0 = mp_id
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// x1 = pei_core_address
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mov x0, x5
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blr x3
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_SetupPrimaryCoreStack:
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// x1 contains the top of the primary stack
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LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), x2)
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// The reserved space for global variable must be 16-bytes aligned for pushing
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// 128-bit variable on the stack
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SetPrimaryStack (x1, x2, x3, x4)
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b _PrepareArguments
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