[PATCH 01/11] common: filetype: add detection for x86 Linux kernel images

[chalianis1@gmail.com]

From: Chali Anis <chalianis1@gmail.com>

Introduce a new filetype for x86 Linux kernel images by checking for
the "HdrS" magic (0x53726448) at offset 0x202 in the setup header.

Signed-off-by: Chali Anis <chalianis1@gmail.com>
---
 common/filetype.c  | 3 +++
 include/filetype.h | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/common/filetype.c b/common/filetype.c
index eb397a175cb6..72f84442cae9 100644
--- a/common/filetype.c
+++ b/common/filetype.c
@@ -87,6 +87,7 @@ static const struct filetype_str filetype_str[] = {
 	[filetype_zstd_compressed] = { "ZSTD compressed", "zstd" },
 	[filetype_rockchip_rkss_image] = { "Rockchip signed boot image",
 					   "rk-image" },
+	[filetype_x86_linux_image] = { "x86 Linux image", "x86-linux" },
 };
 
 static const char *file_type_to_nr_string(enum filetype f)
@@ -435,6 +436,8 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize)
 		return is_dos_exe(buf8) ? filetype_riscv_efi_linux_image : filetype_riscv_linux_image;
 	if (is_riscv_linux_bootimage(buf) && !memcmp(&buf[12], "barebox", 8))
 		return filetype_riscv_barebox_image;
+	if (bufsize > 0x206 && is_x86_linux_bootimage(buf))
+		return filetype_x86_linux_image;
 
 	if (le32_to_cpu(buf[5]) == 0x504d5453)
 		return filetype_mxs_bootstream;
diff --git a/include/filetype.h b/include/filetype.h
index 6f4a103df304..ff4d54ee3c45 100644
--- a/include/filetype.h
+++ b/include/filetype.h
@@ -67,6 +67,7 @@ enum filetype {
 	filetype_nxp_fspi_image,
 	filetype_zstd_compressed,
 	filetype_rockchip_rkss_image,
+	filetype_x86_linux_image,
 	filetype_max,
 };
 
@@ -150,4 +151,9 @@ static inline bool is_riscv_linux_bootimage(const void *header)
 	return le32_to_cpup(header + 56) == 0x05435352;
 }
 
+static inline bool is_x86_linux_bootimage(const void *header)
+{
+	return le32_to_cpup(header + 0x202) == 0x53726448;
+}
+
 #endif /* __FILE_TYPE_H */
-- 
2.34.1