[PATCH v2 13/16] x86: zboot: Add an option to dump the setup information
Bin Meng
bmeng.cn at gmail.com
Tue Sep 1 12:08:55 CEST 2020
On Sun, Aug 30, 2020 at 5:42 AM Simon Glass <sjg at chromium.org> wrote:
>
> There is a lot of information in the setup block and it is quite hard to
> decode manually. Add a 'zboot dump' command to decode it into a
> human-readable format.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Wolfgang Wallner <wolfgang.wallner at br-automation.com>
> ---
>
> (no changes since v1)
>
> arch/x86/include/asm/e820.h | 1 +
> arch/x86/lib/zimage.c | 199 +++++++++++++++++++++++++++++++++++-
> 2 files changed, 199 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
> index 9d29f82f972..d7f8a4ba1df 100644
> --- a/arch/x86/include/asm/e820.h
> +++ b/arch/x86/include/asm/e820.h
> @@ -8,6 +8,7 @@
> #define E820_ACPI 3
> #define E820_NVS 4
> #define E820_UNUSABLE 5
> +#define E820_COUNT 6 /* Number of types */
>
> #ifndef __ASSEMBLY__
> #include <linux/types.h>
> diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
> index 33df0dc682e..aacfffcee7d 100644
> --- a/arch/x86/lib/zimage.c
> +++ b/arch/x86/lib/zimage.c
> @@ -73,6 +73,8 @@ enum {
> ZBOOT_STATE_INFO = BIT(3),
> ZBOOT_STATE_GO = BIT(4),
>
> + /* This one doesn't execute automatically, so stop the count before 5 */
> + ZBOOT_STATE_DUMP = BIT(5),
> ZBOOT_STATE_COUNT = 5,
> };
>
> @@ -458,12 +460,206 @@ static int do_zboot_go(struct cmd_tbl *cmdtp, int flag, int argc,
> return CMD_RET_FAILURE;
> }
>
> +static void print_num(const char *name, ulong value)
> +{
> + printf("%-20s: %lx\n", name, value);
> +}
> +
> +static void print_num64(const char *name, u64 value)
> +{
> + printf("%-20s: %llx\n", name, value);
> +}
> +
> +static const char *const e820_type_name[E820_COUNT] = {
> + [E820_RAM] = "RAM",
> + [E820_RESERVED] = "Reserved",
> + [E820_ACPI] = "ACPI",
> + [E820_NVS] = "ACPI NVS",
> + [E820_UNUSABLE] = "Unusable",
> +};
> +
> +static const char *const bootloader_id[] = {
> + "LILO",
> + "Loadlin",
> + "bootsect-loader",
> + "Syslinux",
> + "Etherboot/gPXE/iPXE",
> + "ELILO",
> + "undefined",
> + "GRUB",
> + "U-Boot",
> + "Xen",
> + "Gujin",
> + "Qemu",
> + "Arcturus Networks uCbootloader",
> + "kexec-tools",
> + "Extended",
> + "Special",
> + "Reserved",
> + "Minimal Linux Bootloader",
> + "OVMF UEFI virtualization stack",
> +};
> +
> +struct flag_info {
> + uint bit;
> + const char *name;
> +};
> +
> +struct flag_info load_flags[] = {
should be static
> + { LOADED_HIGH, "loaded-high" },
> + { QUIET_FLAG, "quiet" },
> + { KEEP_SEGMENTS, "keep-segments" },
> + { CAN_USE_HEAP, "can-use-heap" },
> +};
> +
> +struct flag_info xload_flags[] = {
ditto
> + { XLF_KERNEL_64, "64-bit-entry" },
> + { XLF_CAN_BE_LOADED_ABOVE_4G, "can-load-above-4gb" },
> + { XLF_EFI_HANDOVER_32, "32-efi-handoff" },
> + { XLF_EFI_HANDOVER_64, "64-efi-handoff" },
> + { XLF_EFI_KEXEC, "kexec-efi-runtime" },
> +};
> +
> +static void print_flags(struct flag_info *flags, int count, uint value)
> +{
> + int i;
> +
> + printf("%-20s:", "");
> + for (i = 0; i < count; i++) {
> + uint mask = flags[i].bit;
> +
> + if (value & mask)
> + printf(" %s", flags[i].name);
> + }
> + printf("\n");
> +}
> +
> +static void show_loader(struct setup_header *hdr)
> +{
> + bool version_valid = false;
> + int type, version;
> + const char *name;
> +
> + type = hdr->type_of_loader >> 4;
> + version = hdr->type_of_loader & 0xf;
> + if (type == 0xe)
> + type = 0x10 + hdr->ext_loader_type;
> + version |= hdr->ext_loader_ver << 4;
> + if (!hdr->type_of_loader) {
> + name = "pre-2.00 bootloader";
> + } else if (hdr->type_of_loader == 0xff) {
> + name = "unknown";
> + } else if (type < ARRAY_SIZE(bootloader_id)) {
> + name = bootloader_id[type];
> + version_valid = true;
> + } else {
> + name = "undefined";
> + }
> + printf("%20s %s", "", name);
> + if (version_valid)
> + printf(", version %x", version);
> + printf("\n");
> +}
> +
> +int do_zboot_dump(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
> +{
> + 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);
> +
> + printf("E820: %d entries\n", base_ptr->e820_entries);
> + if (base_ptr->e820_entries) {
> + printf("%18s %16s %s\n", "Addr", "Size", "Type");
> + for (i = 0; i < base_ptr->e820_entries; i++) {
> + struct e820_entry *entry = &base_ptr->e820_map[i];
> +
> + printf("%12llx %10llx %s\n", entry->addr, entry->size,
> + entry->type < E820_COUNT ?
> + e820_type_name[entry->type] :
> + simple_itoa(entry->type));
> + }
> + }
> +
> + hdr = &base_ptr->hdr;
> + print_num("Setup sectors", hdr->setup_sects);
> + print_num("Root flags", hdr->root_flags);
> + print_num("Sys size", hdr->syssize);
> + print_num("RAM size", hdr->ram_size);
> + print_num("Video mode", hdr->vid_mode);
> + print_num("Root dev", hdr->root_dev);
> + print_num("Boot flag", hdr->boot_flag);
> + print_num("Jump", hdr->jump);
> + print_num("Header", hdr->header);
> + if (hdr->header == KERNEL_V2_MAGIC)
> + printf("%-20s %s\n", "", "Kernel V2");
> + else
> + printf("%-20s %s\n", "", "Ancient kernel, using version 100");
> + print_num("Version", hdr->version);
> + print_num("Real mode switch", hdr->realmode_swtch);
> + print_num("Start sys", hdr->start_sys);
> + print_num("Kernel version", hdr->kernel_version);
> + version = get_kernel_version(base_ptr, (void *)state.bzimage_addr);
> + if (version)
> + printf(" @%p: %s\n", version, version);
> + print_num("Type of loader", hdr->type_of_loader);
> + show_loader(hdr);
> + print_num("Load flags", hdr->loadflags);
> + print_flags(load_flags, ARRAY_SIZE(load_flags), hdr->loadflags);
> + print_num("Setup move size", hdr->setup_move_size);
> + print_num("Code32 start", hdr->code32_start);
> + print_num("Ramdisk image", hdr->ramdisk_image);
> + print_num("Ramdisk size", hdr->ramdisk_size);
> + print_num("Bootsect kludge", hdr->bootsect_kludge);
> + print_num("Heap end ptr", hdr->heap_end_ptr);
> + print_num("Ext loader ver", hdr->ext_loader_ver);
> + print_num("Ext loader type", hdr->ext_loader_type);
> + print_num("Commandline ptr", hdr->cmd_line_ptr);
nits: Command line?
> + if (hdr->cmd_line_ptr) {
> + printf(" ");
> + /* Use puts() to avoid limits from CONFIG_SYS_PBSIZE */
> + puts((char *)hdr->cmd_line_ptr);
> + printf("\n");
> + }
> + print_num("Initrd addr max", hdr->initrd_addr_max);
> + print_num("Kernel alignment", hdr->kernel_alignment);
> + print_num("Relocatable kernel", hdr->relocatable_kernel);
> + print_num("Min alignment", hdr->min_alignment);
> + if (hdr->min_alignment)
> + printf("%-20s: %x\n", "", 1 << hdr->min_alignment);
> + print_num("Xload flags", hdr->xloadflags);
> + print_flags(xload_flags, ARRAY_SIZE(xload_flags), hdr->xloadflags);
> + print_num("Cmdline size", hdr->cmdline_size);
> + print_num("Hardware subarch", hdr->hardware_subarch);
> + print_num64("HW subarch data", hdr->hardware_subarch_data);
> + print_num("Payload offset", hdr->payload_offset);
> + print_num("Payload length", hdr->payload_length);
> + print_num64("Setup data", hdr->setup_data);
> + print_num64("Pref address", hdr->pref_address);
> + print_num("Init size", hdr->init_size);
> + print_num("Handover offset", hdr->handover_offset);
> + if (get_boot_protocol(hdr, false) >= 0x215)
> + print_num("Kernel info offset", hdr->kernel_info_offset);
> +
> + return 0;
> +}
> +
> U_BOOT_SUBCMDS(zboot,
> U_BOOT_CMD_MKENT(start, 8, 1, do_zboot_start, "", ""),
> U_BOOT_CMD_MKENT(load, 1, 1, do_zboot_load, "", ""),
> U_BOOT_CMD_MKENT(setup, 1, 1, do_zboot_setup, "", ""),
> U_BOOT_CMD_MKENT(info, 1, 1, do_zboot_info, "", ""),
> U_BOOT_CMD_MKENT(go, 1, 1, do_zboot_go, "", ""),
> + U_BOOT_CMD_MKENT(dump, 2, 1, do_zboot_dump, "", ""),
> )
>
> int do_zboot_states(struct cmd_tbl *cmdtp, int flag, int argc,
> @@ -527,6 +723,7 @@ U_BOOT_CMDREP_COMPLETE(
> "\tload - load OS image\n"
> "\tsetup - set up table\n"
> "\tinfo - show sumary info\n"
> - "\tgo - start OS\n",
> + "\tgo - start OS\n"
> + "\tdump [addr] - dump info (optional address of boot params)",
> complete_zboot
> );
> --
Regards,
Bin
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