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sim: Implement load_addr_mask auto-calculation

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Recent Linux kernels for AArch64 have changed their start addresses
but we still want to relocate the kernel to 0x80080000 which
required hacking the load_addr_mask in Realview.py to be 0x7ffffff
from 0xfffffff to mask off the proper number of MSBs to load the
kernel in the desired location.  To avoid having to make this change
in the future again, we auto-calculate  the load_addr_mask if it is
specified as 0x0 in the System sim-object to find the most restrictive
address mask instead of having the configuration specify it.  If the
configuration does specify the address mask, we use it instead of
auto-calculating.

Change-Id: I18aabb5d09945c6e3e3819c9c8036ea24b6c35cf
Signed-off-by: Geoffrey Blake <Geoffrey.Blake@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2323
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
This commit is contained in:
Geoffrey Blake
2016-05-12 11:47:43 -05:00
committed by Andreas Sandberg
parent 463a4bb6cd
commit 62ae85c0a2
4 changed files with 30 additions and 12 deletions
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8
src/arch/arm/ArmSystem.py
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@@ -1,4 +1,4 @@
# Copyright (c) 2009, 2012-2013, 2015 ARM Limited
# Copyright (c) 2009, 2012-2013, 2015-2017 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
@@ -52,7 +52,6 @@ class ArmMachineType(Enum):
class ArmSystem(System):
type = 'ArmSystem'
cxx_header = "arch/arm/system.hh"
load_addr_mask = 0xffffffff
multi_proc = Param.Bool(True, "Multiprocessor system?")
boot_loader = VectorParam.String([],
"File that contains the boot loader code. Zero or more files may be "
@@ -83,7 +82,6 @@ class ArmSystem(System):
class GenericArmSystem(ArmSystem):
type = 'GenericArmSystem'
cxx_header = "arch/arm/system.hh"
load_addr_mask = 0x0fffffff
machine_type = Param.ArmMachineType('DTOnly',
"Machine id from http://www.arm.linux.org.uk/developer/machines/")
atags_addr = Param.Addr("Address where default atags structure should " \
@@ -108,6 +106,10 @@ class LinuxArmSystem(GenericArmSystem):
"""Dump dmesg from the simulated kernel to standard out"""
pass
# Have Linux systems for ARM auto-calc their load_addr_mask for proper
# kernel relocation.
load_addr_mask = 0x0
class FreebsdArmSystem(GenericArmSystem):
type = 'FreebsdArmSystem'
cxx_header = "arch/arm/freebsd/system.hh"