6ecf110b06
Before the commit, the bootloader had a hardcoded entry point that it would jump to. However, the Linux kernel arm64 v5.8 forced us to change the kernel entry point because the required memory alignment has changed at: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ commit/?h=v5.8&id=cfa7ede20f133cc81cef01dc3a516dda3a9721ee Therefore the only way to have a single bootloader that boots both pre-v5.8 and post-v5.8 kernels is to pass that information from gem5 to the bootloader, which we do in this patch via registers. This approach was already used by the 32-bit bootloader, which passed that value via r3, and we try to use the same register x3 in 64-bit. Since we are now passing this information, the this patch also removes the hardcoding of DTB and cpu-release-addr, and also passes those values via registers. We store the cpu-release-addr in x5 as that value appears to have a function similar to flags_addr, which is used only in 32-bit arm and gets stored in r5. This commit renames atags_addr to dtb_addr, since both are mutually exclusive, and serve a similar purpose, DTB being the newer recommended approach. Similarly, flags_addr is renamed to cpu_release_addr, and it is moved from ArmSystem into ArmFsWorkload, since it is not an intrinsic system property, and should be together with dtb_addr instead. Before this commit, flags_addr was being set from FSConfig.py and configs/example/arm/devices.py to self.realview.realview_io.pio_addr + 0x30. This commit moves that logic into RealView.py instead, and sets the flags address 8 bytes before the start of the DTB address. JIRA: https://gem5.atlassian.net/browse/GEM5-787 Change-Id: If70bea9690be04b84e6040e256a9b03e46710e10 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35076 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
75 lines
2.6 KiB
Makefile
75 lines
2.6 KiB
Makefile
# Copyright (c) 2019-2020 ARM Limited
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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CROSS_COMPILE = aarch64-linux-gnu-
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CC = $(CROSS_COMPILE)gcc
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LD = $(CROSS_COMPILE)ld
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.SUFFIXES:
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BUILDDIR = .
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DESTDIR = $(error Please set DESTDIR to wanted installation directory)
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CFLAGS = -march=armv8-a
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CPPFLAGS = -DUART_BASE=0x1c090000 -DSYSREGS_BASE=0x1c010000
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LDFLAGS = -N -Ttext 0x00000010 -static
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.PHONY: all clean install mkdir
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all: mkdir $(BUILDDIR)/boot_emm.arm64 \
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$(BUILDDIR)/boot.arm64 \
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$(BUILDDIR)/boot_v2.arm64
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#v1 has a GIC V2
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$(BUILDDIR)/boot_emm.o: CPPFLAGS += -UGICV3 -DGIC_CPU_BASE=0x2c002000 \
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-DGIC_DIST_BASE=0x2c001000
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$(BUILDDIR)/boot.o: CPPFLAGS += -UGICV3 -DGIC_CPU_BASE=0x2c002000 \
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-DGIC_DIST_BASE=0x2c001000
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#V2 has a GIC V3
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$(BUILDDIR)/boot_v2.o: CPPFLAGS += -DGICV3 -DGIC_REDIST_BASE=0x2c010000 \
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-DGIC_DIST_BASE=0x2c000000
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$(BUILDDIR)/%.arm64: $(BUILDDIR)/%.o
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$(LD) -o $@ $< $(LDFLAGS)
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$(BUILDDIR)/%.o: boot.S
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$(CC) $(CPPFLAGS) -c $< -o $@ $(CFLAGS)
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install:
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mkdir -p $(DESTDIR)
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install -m 644 $(BUILDDIR)/boot_emm.arm64 \
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$(BUILDDIR)/boot.arm64 \
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$(BUILDDIR)/boot_v2.arm64 \
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$(DESTDIR)/.
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mkdir:
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mkdir -p $(BUILDDIR)
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clean:
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rm -f $(BUILDDIR)/*.o
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rm -f $(BUILDDIR)/boot_emm.arm64 $(BUILDDIR)/boot.arm64 $(BUILDDIR)/boot_v2.arm64
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