sizeof setup_header

setup_header_size.c

#include <stdint.h>
#include <stdio.h>

typedef uint8_t __u8;
typedef uint16_t __u16;
typedef uint32_t __u32;
typedef uint64_t __u64;

struct setup_header {
  __u8 setup_sects;
  __u16 root_flags;
  __u32 syssize;
  __u16 ram_size;
  __u16 vid_mode;
  __u16 root_dev;
  __u16 boot_flag;
  __u16 jump;
  __u32 header;
  __u16 version;
  __u32 realmode_swtch;
  __u16 start_sys_seg;
  __u16 kernel_version;
  __u8 type_of_loader;
  __u8 loadflags;
  __u16 setup_move_size;
  __u32 code32_start;
  __u32 ramdisk_image;
  __u32 ramdisk_size;
  __u32 bootsect_kludge;
  __u16 heap_end_ptr;
  __u8 ext_loader_ver;
  __u8 ext_loader_type;
  __u32 cmd_line_ptr;
  __u32 initrd_addr_max;
  __u32 kernel_alignment;
  __u8 relocatable_kernel;
  __u8 min_alignment;
  __u16 xloadflags;
  __u32 cmdline_size;
  __u32 hardware_subarch;
  __u64 hardware_subarch_data;
  __u32 payload_offset;
  __u32 payload_length;
  __u64 setup_data;
  __u64 pref_address;
  __u32 init_size;
  __u32 handover_offset;
  __u32 kernel_info_offset;
} __attribute__((packed));

int main() {
  struct setup_header sp;
  printf("sizeof(sp)=%lu\n", sizeof(sp));
}