arch/x86/include/uapi/asm/bootparam.h

   1 #ifndef _ASM_X86_BOOTPARAM_H
   2 #define _ASM_X86_BOOTPARAM_H
   3
   4 /* setup_data types */
   5 #define SETUP_NONE                      0
   6 #define SETUP_E820_EXT                  1
   7 #define SETUP_DTB                       2
   8 #define SETUP_PCI                       3
   9 #define SETUP_EFI                       4
  10
  11 /* ram_size flags */
  12 #define RAMDISK_IMAGE_START_MASK        0x07FF
  13 #define RAMDISK_PROMPT_FLAG             0x8000
  14 #define RAMDISK_LOAD_FLAG               0x4000
  15
  16 /* loadflags */
  17 #define LOADED_HIGH     (1<<0)
  18 #define KASLR_FLAG      (1<<1)
  19 #define QUIET_FLAG      (1<<5)
  20 #define KEEP_SEGMENTS   (1<<6)
  21 #define CAN_USE_HEAP    (1<<7)
  22
  23 /* xloadflags */
  24 #define XLF_KERNEL_64                   (1<<0)
  25 #define XLF_CAN_BE_LOADED_ABOVE_4G      (1<<1)
  26 #define XLF_EFI_HANDOVER_32             (1<<2)
  27 #define XLF_EFI_HANDOVER_64             (1<<3)
  28 #define XLF_EFI_KEXEC                   (1<<4)
  29
  30 #ifndef __ASSEMBLY__
  31
  32 #include <linux/types.h>
  33 #include <linux/screen_info.h>
  34 #include <linux/apm_bios.h>
  35 #include <linux/edd.h>
  36 #include <asm/e820.h>
  37 #include <asm/ist.h>
  38 #include <video/edid.h>
  39
  40 /* extensible setup data list node */
  41 struct setup_data {
  42         __u64 next;
  43         __u32 type;
  44         __u32 len;
  45         __u8 data[0];
  46 };
  47
  48 struct setup_header {
  49         __u8    setup_sects;
  50         __u16   root_flags;
  51         __u32   syssize;
  52         __u16   ram_size;
  53         __u16   vid_mode;
  54         __u16   root_dev;
  55         __u16   boot_flag;
  56         __u16   jump;
  57         __u32   header;
  58         __u16   version;
  59         __u32   realmode_swtch;
  60         __u16   start_sys;
  61         __u16   kernel_version;
  62         __u8    type_of_loader;
  63         __u8    loadflags;
  64         __u16   setup_move_size;
  65         __u32   code32_start;
  66         __u32   ramdisk_image;
  67         __u32   ramdisk_size;
  68         __u32   bootsect_kludge;
  69         __u16   heap_end_ptr;
  70         __u8    ext_loader_ver;
  71         __u8    ext_loader_type;
  72         __u32   cmd_line_ptr;
  73         __u32   initrd_addr_max;
  74         __u32   kernel_alignment;
  75         __u8    relocatable_kernel;
  76         __u8    min_alignment;
  77         __u16   xloadflags;
  78         __u32   cmdline_size;
  79         __u32   hardware_subarch;
  80         __u64   hardware_subarch_data;
  81         __u32   payload_offset;
  82         __u32   payload_length;
  83         __u64   setup_data;
  84         __u64   pref_address;
  85         __u32   init_size;
  86         __u32   handover_offset;
  87 } __attribute__((packed));
  88
  89 struct sys_desc_table {
  90         __u16 length;
  91         __u8  table[14];
  92 };
  93
  94 /* Gleaned from OFW's set-parameters in cpu/x86/pc/linux.fth */
  95 struct olpc_ofw_header {
  96         __u32 ofw_magic;        /* OFW signature */
  97         __u32 ofw_version;
  98         __u32 cif_handler;      /* callback into OFW */
  99         __u32 irq_desc_table;
 100 } __attribute__((packed));
 101
 102 struct efi_info {
 103         __u32 efi_loader_signature;
 104         __u32 efi_systab;
 105         __u32 efi_memdesc_size;
 106         __u32 efi_memdesc_version;
 107         __u32 efi_memmap;
 108         __u32 efi_memmap_size;
 109         __u32 efi_systab_hi;
 110         __u32 efi_memmap_hi;
 111 };
 112
 113 /* The so-called "zeropage" */
 114 struct boot_params {
 115         struct screen_info screen_info;                 /* 0x000 */
 116         struct apm_bios_info apm_bios_info;             /* 0x040 */
 117         __u8  _pad2[4];                                 /* 0x054 */
 118         __u64  tboot_addr;                              /* 0x058 */
 119         struct ist_info ist_info;                       /* 0x060 */
 120         __u8  _pad3[16];                                /* 0x070 */
 121         __u8  hd0_info[16];     /* obsolete! */         /* 0x080 */
 122         __u8  hd1_info[16];     /* obsolete! */         /* 0x090 */
 123         struct sys_desc_table sys_desc_table; /* obsolete! */   /* 0x0a0 */
 124         struct olpc_ofw_header olpc_ofw_header;         /* 0x0b0 */
 125         __u32 ext_ramdisk_image;                        /* 0x0c0 */
 126         __u32 ext_ramdisk_size;                         /* 0x0c4 */
 127         __u32 ext_cmd_line_ptr;                         /* 0x0c8 */
 128         __u8  _pad4[116];                               /* 0x0cc */
 129         struct edid_info edid_info;                     /* 0x140 */
 130         struct efi_info efi_info;                       /* 0x1c0 */
 131         __u32 alt_mem_k;                                /* 0x1e0 */
 132         __u32 scratch;          /* Scratch field! */    /* 0x1e4 */
 133         __u8  e820_entries;                             /* 0x1e8 */
 134         __u8  eddbuf_entries;                           /* 0x1e9 */
 135         __u8  edd_mbr_sig_buf_entries;                  /* 0x1ea */
 136         __u8  kbd_status;                               /* 0x1eb */
 137         __u8  _pad5[3];                                 /* 0x1ec */
 138         /*
 139          * The sentinel is set to a nonzero value (0xff) in header.S.
 140          *
 141          * A bootloader is supposed to only take setup_header and put
 142          * it into a clean boot_params buffer. If it turns out that
 143          * it is clumsy or too generous with the buffer, it most
 144          * probably will pick up the sentinel variable too. The fact
 145          * that this variable then is still 0xff will let kernel
 146          * know that some variables in boot_params are invalid and
 147          * kernel should zero out certain portions of boot_params.
 148          */
 149         __u8  sentinel;                                 /* 0x1ef */
 150         __u8  _pad6[1];                                 /* 0x1f0 */
 151         struct setup_header hdr;    /* setup header */  /* 0x1f1 */
 152         __u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];
 153         __u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];      /* 0x290 */
 154         struct e820entry e820_map[E820MAX];             /* 0x2d0 */
 155         __u8  _pad8[48];                                /* 0xcd0 */
 156         struct edd_info eddbuf[EDDMAXNR];               /* 0xd00 */
 157         __u8  _pad9[276];                               /* 0xeec */
 158 } __attribute__((packed));
 159
 160 /**
 161  * enum x86_hardware_subarch - x86 hardware subarchitecture
 162  *
 163  * The x86 hardware_subarch and hardware_subarch_data were added as of the x86
 164  * boot protocol 2.07 to help distinguish and support custom x86 boot
 165  * sequences. This enum represents accepted values for the x86
 166  * hardware_subarch.  Custom x86 boot sequences (not X86_SUBARCH_PC) do not
 167  * have or simply *cannot* make use of natural stubs like BIOS or EFI, the
 168  * hardware_subarch can be used on the Linux entry path to revector to a
 169  * subarchitecture stub when needed. This subarchitecture stub can be used to
 170  * set up Linux boot parameters or for special care to account for nonstandard
 171  * handling of page tables.
 172  *
 173  * These enums should only ever be used by x86 code, and the code that uses
 174  * it should be well contained and compartamentalized.
 175  *
 176  * KVM and Xen HVM do not have a subarch as these are expected to follow
 177  * standard x86 boot entries. If there is a genuine need for "hypervisor" type
 178  * that should be considered separately in the future. Future guest types
 179  * should seriously consider working with standard x86 boot stubs such as
 180  * the BIOS or EFI boot stubs.
 181  *
 182  * WARNING: this enum is only used for legacy hacks, for platform features that
 183  *          are not easily enumerated or discoverable. You should not ever use
 184  *          this for new features.
 185  *
 186  * @X86_SUBARCH_PC: Should be used if the hardware is enumerable using standard
 187  *      PC mechanisms (PCI, ACPI) and doesn't need a special boot flow.
 188  * @X86_SUBARCH_LGUEST: Used for x86 hypervisor demo, lguest
 189  * @X86_SUBARCH_XEN: Used for Xen guest types which follow the PV boot path,
 190  *      which start at asm startup_xen() entry point and later jump to the C
 191  *      xen_start_kernel() entry point. Both domU and dom0 type of guests are
 192  *      currently supportd through this PV boot path.
 193  * @X86_SUBARCH_INTEL_MID: Used for Intel MID (Mobile Internet Device) platform
 194  *      systems which do not have the PCI legacy interfaces.
 195  * @X86_SUBARCH_CE4100: Used for Intel CE media processor (CE4100) SoC for
 196  *      for settop boxes and media devices, the use of a subarch for CE4100
 197  *      is more of a hack...
 198  */
 199 enum x86_hardware_subarch {
 200         X86_SUBARCH_PC = 0,
 201         X86_SUBARCH_LGUEST,
 202         X86_SUBARCH_XEN,
 203         X86_SUBARCH_INTEL_MID,
 204         X86_SUBARCH_CE4100,
 205         X86_NR_SUBARCHS,
 206 };
 207
 208 #endif /* __ASSEMBLY__ */
 209
 210 #endif /* _ASM_X86_BOOTPARAM_H */