[PATCH v4 3/3] MIPS: bootm: add ELF handler

[Oleksij Rempel <o.rempel@pengutronix.de>]

With this handler barebox will be able to start linux kernel as
is, without additional image conversion.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/mips/lib/bootm.c | 59 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c
index 91e7e1c68..f14540a4c 100644
--- a/arch/mips/lib/bootm.c
+++ b/arch/mips/lib/bootm.c
@@ -10,6 +10,7 @@
 #include <restart.h>
 
 #include <asm/byteorder.h>
+#include <asm/io.h>
 
 static int do_bootm_barebox(struct image_data *data)
 {
@@ -42,11 +43,69 @@ static struct binfmt_hook binfmt_barebox_hook = {
 	.exec = "bootm",
 };
 
+static int do_bootm_elf(struct image_data *data)
+{
+	void (*entry)(int, void *);
+	struct elf_image *elf;
+	void *fdt, *buf;
+	int ret = 0;
+
+	buf = read_file(data->os_file, NULL);
+	if (!buf)
+		return -EINVAL;
+
+	elf = elf_load_image(buf);
+	if (IS_ERR(elf))
+		return PTR_ERR(elf);
+
+	fdt = bootm_get_devicetree(data);
+	if (IS_ERR(fdt)) {
+		ret = PTR_ERR(fdt);
+		goto bootm_elf_done;
+	}
+
+	pr_info("Starting application at 0x%08lx, dts 0x%08lx...\n",
+		phys_to_virt(elf->entry), data->of_root_node);
+
+	if (data->dryrun)
+		goto bootm_elf_done;
+
+	shutdown_barebox();
+
+	entry = (void *)elf->entry;
+
+	entry(-2, phys_to_virt((unsigned long)fdt));
+
+	pr_err("ELF application terminated\n");
+	ret = -EINVAL;
+
+bootm_elf_done:
+	elf_release_image(elf);
+	free(fdt);
+	free(buf);
+
+	return ret;
+}
+
+static struct image_handler elf_handler = {
+	.name = "ELF",
+	.bootm = do_bootm_elf,
+	.filetype = filetype_elf,
+};
+
+static struct binfmt_hook binfmt_elf_hook = {
+	.type = filetype_elf,
+	.exec = "bootm",
+};
+
 static int mips_register_image_handler(void)
 {
 	register_image_handler(&barebox_handler);
 	binfmt_register(&binfmt_barebox_hook);
 
+	register_image_handler(&elf_handler);
+	binfmt_register(&binfmt_elf_hook);
+
 	return 0;
 }
 late_initcall(mips_register_image_handler);
-- 
2.17.1


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