From: Alban Bedel <alban.bedel@xxxxxxxxxxxxxxxxx>
Add very basic support for booting an android image. The ramdisk and
command line from the image are only used if none has been given on
the command line.
Signed-off-by: Alban Bedel <alban.bedel at avionic-design.de>
---
kexec/arch/arm/kexec-zImage-arm.c | 56 +++++++++++++++++++++++++++++++++++++--
1 file changed, 54 insertions(+), 2 deletions(-)
diff --git a/kexec/arch/arm/kexec-zImage-arm.c b/kexec/arch/arm/kexec-zImage-arm.c
index 0ac194d..3222dd3 100644
--- a/kexec/arch/arm/kexec-zImage-arm.c
+++ b/kexec/arch/arm/kexec-zImage-arm.c
@@ -27,6 +27,23 @@ off_t initrd_base = 0, initrd_size = 0;
unsigned int kexec_arm_image_size = 0;
unsigned long long user_page_offset = (-1ULL);
+struct android_image {
+ char magic[8];
+ uint32_t kernel_size;
+ uint32_t kernel_addr;
+ uint32_t ramdisk_size;
+ uint32_t ramdisk_addr;
+ uint32_t stage2_size;
+ uint32_t stage2_addr;
+ uint32_t tags_addr;
+ uint32_t page_size;
+ uint32_t reserved1;
+ uint32_t reserved2;
+ char name[16];
+ char command_line[512];
+ uint32_t chksum[8];
+};
+
struct tag_header {
uint32_t size;
uint32_t tag;
@@ -328,7 +345,7 @@ int zImage_arm_load(int argc, char **argv, const char *buf, off_t len,
char *modified_cmdline = NULL;
off_t command_line_len;
const char *ramdisk;
- char *ramdisk_buf;
+ const char *ramdisk_buf;
int opt;
int use_atags;
char *dtb_buf;
@@ -415,6 +432,41 @@ int zImage_arm_load(int argc, char **argv, const char *buf, off_t len,
if (dtb_file)
dtb_buf = slurp_file(dtb_file, &dtb_length);
+ /* Handle android images, 2048 is the minimum page size */
+ if (len > 2048 && !strncmp(buf, "ANDROID!", 8)) {
+ const struct android_image *aimg = (const void *)buf;
+ uint32_t page_size = le32_to_cpu(aimg->page_size);
+ uint32_t kernel_size = le32_to_cpu(aimg->kernel_size);
+ uint32_t ramdisk_size = le32_to_cpu(aimg->ramdisk_size);
+ uint32_t stage2_size = le32_to_cpu(aimg->stage2_size);
+ off_t aimg_size = page_size + _ALIGN(kernel_size, page_size) +
+ _ALIGN(ramdisk_size, page_size) + stage2_size;
+
+ if (len < aimg_size) {
+ fprintf(stderr, "Android image size is incorrect\n");
+ return -1;
+ }
+
+ /* Get the kernel */
+ buf = buf + page_size;
+ len = kernel_size;
+
+ /* And the ramdisk if none was given on the command line */
+ if (!ramdisk && ramdisk_size) {
+ initrd_size = ramdisk_size;
+ ramdisk_buf = buf + _ALIGN(kernel_size, page_size);
+ }
+
+ /* Likewise for the command line */
+ if (!command_line && aimg->command_line[0]) {
+ command_line = aimg->command_line;
+ if (command_line[sizeof(aimg->command_line) - 1])
+ command_line_len = sizeof(aimg->command_line);
+ else
+ command_line_len = strlen(command_line) + 1;
+ }
+ }
+
/*
* If we are loading a dump capture kernel, we need to update kernel
* command line and also add some additional segments.
@@ -534,7 +586,7 @@ int zImage_arm_load(int argc, char **argv, const char *buf, off_t len,
initrd_base = initrd_base_new;
}
- if (ramdisk) {
+ if (ramdisk_buf) {
add_segment(info, ramdisk_buf, initrd_size,
initrd_base, initrd_size);
--
2.1.4
