67 lines
2.4 KiB
Diff
67 lines
2.4 KiB
Diff
Subject: src: Uncompress kernel on RISC-V
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From: Richard W.M. Jones rjones@redhat.com Fri Nov 10 10:20:49 2023 +0000
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Date: Fri Nov 10 10:28:21 2023 +0000:
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Git: 5230e2c3cd07e82bd6431e871e239f7056bf25ad
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diff --git a/src/format_ext2_kernel.ml b/src/format_ext2_kernel.ml
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index 36514c6..09a3f21 100644
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--- a/src/format_ext2_kernel.ml
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+++ b/src/format_ext2_kernel.ml
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@@ -25,6 +25,20 @@ open Ext2fs
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open Fnmatch
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open Glob
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+(* Similar but not the same as get_file_type in mode_build. There
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+ * is a case for deriving a common base utility. XXX
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+ *)
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+type compression_type = GZip | Uncompressed
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+let get_compression_type file =
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+ let chan = open_in file in
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+ let buf = Bytes.create 512 in
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+ let len = input chan buf 0 (Bytes.length buf) in
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+ close_in chan;
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+ let buf = Bytes.to_string buf in
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+ if len >= 3 && buf.[0] = '\x1f' && buf.[1] = '\x8b' && buf.[2] = '\x08'
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+ then GZip
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+ else Uncompressed (* or other unknown compression type *)
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+
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let rec build_kernel debug host_cpu copy_kernel kernel =
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(* Locate the kernel.
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* SUPERMIN_* environment variables override everything. If those
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@@ -54,7 +68,19 @@ let rec build_kernel debug host_cpu copy_kernel kernel =
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printf "supermin: kernel: modpath %s\n%!" modpath;
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);
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- copy_or_symlink_kernel copy_kernel kernel_file kernel;
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+ (* RISC-V relies on the bootloader or firmware to uncompress the
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+ * kernel and doesn't have a concept of self-extracting kernels.
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+ * On Arm which is similar, qemu -kernel will automatically uncompress
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+ * the kernel, but qemu-system-riscv won't do that and the code is a
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+ * big mess so I don't fancy fixing it. So we have to detect that
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+ * case here and uncompress the kernel.
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+ *)
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+ let kernel_compression_type = get_compression_type kernel_file in
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+ if string_prefix "riscv" host_cpu && kernel_compression_type <> Uncompressed
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+ then
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+ copy_and_uncompress_kernel kernel_compression_type kernel_file kernel
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+ else
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+ copy_or_symlink_kernel copy_kernel kernel_file kernel;
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(kernel_version, modpath)
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@@ -308,6 +334,13 @@ and read_string chan offset len =
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really_input chan buf 0 len;
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Bytes.to_string buf
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+and copy_and_uncompress_kernel compression_type src dest =
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+ let cmd =
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+ match compression_type with
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+ | GZip -> sprintf "zcat %s > %s" (quote src) (quote dest)
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+ | Uncompressed -> sprintf "cp %s %s" (quote src) (quote dest) in
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+ run_command cmd
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+
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and copy_or_symlink_kernel copy_kernel src dest =
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if not copy_kernel then
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symlink src dest
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