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x86: zimage: Allow dumping the image from outside the module

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At present it is possible to dump an image within the zimage command, but
it is also useful to be able to dump it from elsewhere, for example in a
loader that has special handling for the different zimage stages.

Export this feature as a new function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2021-01-24 10:06:08 -07:00 committed by Bin Meng
parent f82438948f
commit 577c4ad055
2 changed files with 25 additions and 8 deletions
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10
arch/x86/include/asm/zimage.h
View File

@ -62,6 +62,16 @@ struct boot_params *load_zimage(char *image, unsigned long kernel_size,
int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
ulong initrd_addr, ulong initrd_size, ulong cmdline_force);
/**
* zimage_dump() - Dump the metadata of a zimage
*
* This shows all available information in a zimage that has been loaded.
*
* @base_ptr: Pointer to the boot parameters, typically at address
* DEFAULT_SETUP_BASE
*/
void zimage_dump(struct boot_params *base_ptr);
void setup_video(struct screen_info *screen_info);
void setup_efi_info(struct efi_info *efi_info);

23
arch/x86/lib/zimage.c
View File

@ -600,19 +600,12 @@ static void show_loader(struct setup_header *hdr)
printf("\n");
}
int do_zboot_dump(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
void zimage_dump(struct boot_params *base_ptr)
{
struct boot_params *base_ptr = state.base_ptr;
struct setup_header *hdr;
const char *version;
int i;
if (argc > 1)
base_ptr = (void *)simple_strtoul(argv[1], NULL, 16);
if (!base_ptr) {
printf("No zboot setup_base\n");
return CMD_RET_FAILURE;
}
printf("Setup located at %p:\n\n", base_ptr);
print_num64("ACPI RSDP addr", base_ptr->acpi_rsdp_addr);
@ -688,6 +681,20 @@ int do_zboot_dump(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
print_num("Handover offset", hdr->handover_offset);
if (get_boot_protocol(hdr, false) >= 0x215)
print_num("Kernel info offset", hdr->kernel_info_offset);
}
static int do_zboot_dump(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
struct boot_params *base_ptr = state.base_ptr;
if (argc > 1)
base_ptr = (void *)simple_strtoul(argv[1], NULL, 16);
if (!base_ptr) {
printf("No zboot setup_base\n");
return CMD_RET_FAILURE;
}
zimage_dump(base_ptr);
return 0;
}