Alistair Delva has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/54184 )
Change subject: arch-arm: Add support for initrd/initramfs
......................................................................
arch-arm: Add support for initrd/initramfs
Add initrd_filename and initrd_addr parameters to specify that an
initrd/initramfs should be loaded into memory from a file, just like the
DTB blob. The user must specify the initrd file, and they can specify
the initrd load address as well. However, in practice, it's expected
that the dev/machine backend will derive the initrd load address from
the dtb load address, which is how a bootloader would typically do it.
Change-Id: I6378927c2984b7ccdd1471486dd7803500ef5883
Signed-off-by: Alistair Delva <[email protected]>
---
M src/arch/arm/linux/fs_workload.cc
M src/arch/arm/ArmFsWorkload.py
2 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/src/arch/arm/ArmFsWorkload.py b/src/arch/arm/ArmFsWorkload.py
index 974600b..43bbd16 100644
--- a/src/arch/arm/ArmFsWorkload.py
+++ b/src/arch/arm/ArmFsWorkload.py
@@ -58,6 +58,9 @@
dtb_filename = Param.String("",
"File that contains the Device Tree Blob. Don't use DTB if empty.")
dtb_addr = Param.Addr(0, "DTB or ATAGS address")
+ initrd_filename = Param.String("",
+ "File that contains the initial ramdisk. Don't use initrd if
empty.")
+ initrd_addr = Param.Addr(0, "initrd/initramfs address")
cpu_release_addr = Param.Addr(0, "cpu-release-addr property")
machine_type = Param.ArmMachineType('DTOnly',
diff --git a/src/arch/arm/linux/fs_workload.cc
b/src/arch/arm/linux/fs_workload.cc
index d512067..e724eb1 100644
--- a/src/arch/arm/linux/fs_workload.cc
+++ b/src/arch/arm/linux/fs_workload.cc
@@ -91,6 +91,21 @@
bool dtb_file_specified = params().dtb_filename != "";
if (kernel_has_fdt_support && dtb_file_specified) {
+ bool initrd_file_specified = params().initrd_filename != "";
+ size_t initrd_len = 0;
+
+ if (initrd_file_specified) {
+ inform("Loading initrd file: %s at address %#x\n",
+ params().initrd_filename, params().initrd_addr);
+
+ loader::ImageFileDataPtr initrd_file_data(
+ new loader::ImageFileData(params().initrd_filename));
+ system->physProxy.writeBlob(params().initrd_addr,
+ initrd_file_data->data(),
+ initrd_file_data->len());
+ initrd_len = initrd_file_data->len();
+ }
+
// Kernel supports flattened device tree and dtb file specified.
// Using Device Tree Blob to describe system configuration.
inform("Loading DTB file: %s at address %#x\n",
params().dtb_filename,
@@ -98,8 +113,8 @@
auto *dtb_file = new loader::DtbFile(params().dtb_filename);
- if (!dtb_file->addBootCmdLine(
- commandLine.c_str(), commandLine.size())) {
+ if (!dtb_file->addBootData(commandLine.c_str(), commandLine.size(),
+ params().initrd_addr, initrd_len)) {
warn("couldn't append bootargs to DTB file: %s\n",
params().dtb_filename);
}
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I6378927c2984b7ccdd1471486dd7803500ef5883
Gerrit-Change-Number: 54184
Gerrit-PatchSet: 1
Gerrit-Owner: Alistair Delva <[email protected]>
Gerrit-MessageType: newchange
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