linux kernel struct 之 boot_params

linux-4.9.37/arch/x86/include/uappi/asm/bootparam.h

用于存储从bootloader传递到内核的启动参数和系统配置信息。‌

struct boot_params {
    struct screen_info screen_info;            /* 0x000 */
    struct apm_bios_info apm_bios_info;        /* 0x040 */
    __u8  _pad2[4];                    /* 0x054 */
    __u64  tboot_addr;                /* 0x058 */
    struct ist_info ist_info;            /* 0x060 */
    __u8  _pad3[16];                /* 0x070 */
    __u8  hd0_info[16];    /* obsolete! */        /* 0x080 */
    __u8  hd1_info[16];    /* obsolete! */        /* 0x090 */
    struct sys_desc_table sys_desc_table; /* obsolete! */    /* 0x0a0 */
    struct olpc_ofw_header olpc_ofw_header;        /* 0x0b0 */
    __u32 ext_ramdisk_image;            /* 0x0c0 */
    __u32 ext_ramdisk_size;                /* 0x0c4 */
    __u32 ext_cmd_line_ptr;                /* 0x0c8 */
    __u8  _pad4[116];                /* 0x0cc */
    struct edid_info edid_info;            /* 0x140 */
    struct efi_info efi_info;            /* 0x1c0 */
    __u32 alt_mem_k;                /* 0x1e0 */
    __u32 scratch;        /* Scratch field! */    /* 0x1e4 */
    __u8  e820_entries;                /* 0x1e8 */
    __u8  eddbuf_entries;                /* 0x1e9 */
    __u8  edd_mbr_sig_buf_entries;            /* 0x1ea */
    __u8  kbd_status;                /* 0x1eb */
    __u8  _pad5[3];                    /* 0x1ec */
    /*
     * The sentinel is set to a nonzero value (0xff) in header.S.
     *
     * A bootloader is supposed to only take setup_header and put
     * it into a clean boot_params buffer. If it turns out that
     * it is clumsy or too generous with the buffer, it most
     * probably will pick up the sentinel variable too. The fact
     * that this variable then is still 0xff will let kernel
     * know that some variables in boot_params are invalid and
     * kernel should zero out certain portions of boot_params.
     */
    __u8  sentinel;                    /* 0x1ef */
    __u8  _pad6[1];                    /* 0x1f0 */
    struct setup_header hdr;    /* setup header */    /* 0x1f1 */
    __u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];
    __u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];    /* 0x290 */
    struct e820entry e820_map[E820MAX];        /* 0x2d0 */
    __u8  _pad8[48];                /* 0xcd0 */
    struct edd_info eddbuf[EDDMAXNR];        /* 0xd00 */
    __u8  _pad9[276];                /* 0xeec */
} __attribute__((packed));