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From f06e2812a6813c8c93fee50bd8beb5ae5d8cb871 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Tue, 19 Aug 2014 18:56:28 +0100
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Subject: [PATCH] aarch64: Allow -kernel option to take a gzip-compressed
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kernel.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On aarch64 it is the bootloader's job to uncompress the kernel. UEFI
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and u-boot bootloaders do this automatically when the kernel is
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gzip-compressed.
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However the qemu -kernel option does not do this. The following
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command does not work:
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qemu-system-aarch64 [...] -kernel /boot/vmlinuz
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because it tries to execute the gzip-compressed data.
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This commit lets gzip-compressed kernels be uncompressed
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transparently.
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Currently this is only done when emulating aarch64.
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
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Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
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Message-id: 1407831259-2115-3-git-send-email-rjones@redhat.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit 6f5d3cbe8892367026526a7deed0ceecc700a7ad)
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---
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hw/arm/boot.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/arm/boot.c b/hw/arm/boot.c
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index 3d1f4a2..b7d60aa 100644
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--- a/hw/arm/boot.c
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+++ b/hw/arm/boot.c
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@@ -510,6 +510,13 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
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kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
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&is_linux);
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}
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+ /* On aarch64, it's the bootloader's job to uncompress the kernel. */
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+ if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) && kernel_size < 0) {
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+ entry = info->loader_start + kernel_load_offset;
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+ kernel_size = load_image_gzipped(info->kernel_filename, entry,
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+ info->ram_size - kernel_load_offset);
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+ is_linux = 1;
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+ }
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if (kernel_size < 0) {
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entry = info->loader_start + kernel_load_offset;
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kernel_size = load_image_targphys(info->kernel_filename, entry,
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