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

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _ASM_X86_BOOTPARAM_H
   3 #define _ASM_X86_BOOTPARAM_H
   4
   5 #include <asm/setup_data.h>
   6
   7 /* ram_size flags */
   8 #define RAMDISK_IMAGE_START_MASK        0x07FF
   9 #define RAMDISK_PROMPT_FLAG             0x8000
  10 #define RAMDISK_LOAD_FLAG               0x4000
  11
  12 /* loadflags */
  13 #define LOADED_HIGH     (1<<0)
  14 #define KASLR_FLAG      (1<<1)
  15 #define QUIET_FLAG      (1<<5)
  16 #define KEEP_SEGMENTS   (1<<6)
  17 #define CAN_USE_HEAP    (1<<7)
  18
  19 /* xloadflags */
  20 #define XLF_KERNEL_64                   (1<<0)
  21 #define XLF_CAN_BE_LOADED_ABOVE_4G      (1<<1)
  22 #define XLF_EFI_HANDOVER_32             (1<<2)
  23 #define XLF_EFI_HANDOVER_64             (1<<3)
  24 #define XLF_EFI_KEXEC                   (1<<4)
  25 #define XLF_5LEVEL                      (1<<5)
  26 #define XLF_5LEVEL_ENABLED              (1<<6)
  27 #define XLF_MEM_ENCRYPTION              (1<<7)
  28
  29 #ifndef __ASSEMBLY__
  30
  31 #include <linux/types.h>
  32 #include <linux/screen_info.h>
  33 #include <linux/apm_bios.h>
  34 #include <linux/edd.h>
  35 #include <asm/ist.h>
  36 #include <video/edid.h>
  37
  38 struct setup_header {
  39         __u8    setup_sects;
  40         __u16   root_flags;
  41         __u32   syssize;
  42         __u16   ram_size;
  43         __u16   vid_mode;
  44         __u16   root_dev;
  45         __u16   boot_flag;
  46         __u16   jump;
  47         __u32   header;
  48         __u16   version;
  49         __u32   realmode_swtch;
  50         __u16   start_sys_seg;
  51         __u16   kernel_version;
  52         __u8    type_of_loader;
  53         __u8    loadflags;
  54         __u16   setup_move_size;
  55         __u32   code32_start;
  56         __u32   ramdisk_image;
  57         __u32   ramdisk_size;
  58         __u32   bootsect_kludge;
  59         __u16   heap_end_ptr;
  60         __u8    ext_loader_ver;
  61         __u8    ext_loader_type;
  62         __u32   cmd_line_ptr;
  63         __u32   initrd_addr_max;
  64         __u32   kernel_alignment;
  65         __u8    relocatable_kernel;
  66         __u8    min_alignment;
  67         __u16   xloadflags;
  68         __u32   cmdline_size;
  69         __u32   hardware_subarch;
  70         __u64   hardware_subarch_data;
  71         __u32   payload_offset;
  72         __u32   payload_length;
  73         __u64   setup_data;
  74         __u64   pref_address;
  75         __u32   init_size;
  76         __u32   handover_offset;
  77         __u32   kernel_info_offset;
  78 } __attribute__((packed));
  79
  80 struct sys_desc_table {
  81         __u16 length;
  82         __u8  table[14];
  83 };
  84
  85 /* Gleaned from OFW's set-parameters in cpu/x86/pc/linux.fth */
  86 struct olpc_ofw_header {
  87         __u32 ofw_magic;        /* OFW signature */
  88         __u32 ofw_version;
  89         __u32 cif_handler;      /* callback into OFW */
  90         __u32 irq_desc_table;
  91 } __attribute__((packed));
  92
  93 struct efi_info {
  94         __u32 efi_loader_signature;
  95         __u32 efi_systab;
  96         __u32 efi_memdesc_size;
  97         __u32 efi_memdesc_version;
  98         __u32 efi_memmap;
  99         __u32 efi_memmap_size;
 100         __u32 efi_systab_hi;
 101         __u32 efi_memmap_hi;
 102 };
 103
 104 /*
 105  * This is the maximum number of entries in struct boot_params::e820_table
 106  * (the zeropage), which is part of the x86 boot protocol ABI:
 107  */
 108 #define E820_MAX_ENTRIES_ZEROPAGE 128
 109
 110 /*
 111  * Smallest compatible version of jailhouse_setup_data required by this kernel.
 112  */
 113 #define JAILHOUSE_SETUP_REQUIRED_VERSION        1
 114
 115 /* The so-called "zeropage" */
 116 struct boot_params {
 117         struct screen_info screen_info;                 /* 0x000 */
 118         struct apm_bios_info apm_bios_info;             /* 0x040 */
 119         __u8  _pad2[4];                                 /* 0x054 */
 120         __u64  tboot_addr;                              /* 0x058 */
 121         struct ist_info ist_info;                       /* 0x060 */
 122         __u64 acpi_rsdp_addr;                           /* 0x070 */
 123         __u8  _pad3[8];                                 /* 0x078 */
 124         __u8  hd0_info[16];     /* obsolete! */         /* 0x080 */
 125         __u8  hd1_info[16];     /* obsolete! */         /* 0x090 */
 126         struct sys_desc_table sys_desc_table; /* obsolete! */   /* 0x0a0 */
 127         struct olpc_ofw_header olpc_ofw_header;         /* 0x0b0 */
 128         __u32 ext_ramdisk_image;                        /* 0x0c0 */
 129         __u32 ext_ramdisk_size;                         /* 0x0c4 */
 130         __u32 ext_cmd_line_ptr;                         /* 0x0c8 */
 131         __u8  _pad4[112];                               /* 0x0cc */
 132         __u32 cc_blob_address;                          /* 0x13c */
 133         struct edid_info edid_info;                     /* 0x140 */
 134         struct efi_info efi_info;                       /* 0x1c0 */
 135         __u32 alt_mem_k;                                /* 0x1e0 */
 136         __u32 scratch;          /* Scratch field! */    /* 0x1e4 */
 137         __u8  e820_entries;                             /* 0x1e8 */
 138         __u8  eddbuf_entries;                           /* 0x1e9 */
 139         __u8  edd_mbr_sig_buf_entries;                  /* 0x1ea */
 140         __u8  kbd_status;                               /* 0x1eb */
 141         __u8  secure_boot;                              /* 0x1ec */
 142         __u8  _pad5[2];                                 /* 0x1ed */
 143         /*
 144          * The sentinel is set to a nonzero value (0xff) in header.S.
 145          *
 146          * A bootloader is supposed to only take setup_header and put
 147          * it into a clean boot_params buffer. If it turns out that
 148          * it is clumsy or too generous with the buffer, it most
 149          * probably will pick up the sentinel variable too. The fact
 150          * that this variable then is still 0xff will let kernel
 151          * know that some variables in boot_params are invalid and
 152          * kernel should zero out certain portions of boot_params.
 153          */
 154         __u8  sentinel;                                 /* 0x1ef */
 155         __u8  _pad6[1];                                 /* 0x1f0 */
 156         struct setup_header hdr;    /* setup header */  /* 0x1f1 */
 157         __u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];
 158         __u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];      /* 0x290 */
 159         struct boot_e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */
 160         __u8  _pad8[48];                                /* 0xcd0 */
 161         struct edd_info eddbuf[EDDMAXNR];               /* 0xd00 */
 162         __u8  _pad9[276];                               /* 0xeec */
 163 } __attribute__((packed));
 164
 165 /**
 166  * enum x86_hardware_subarch - x86 hardware subarchitecture
 167  *
 168  * The x86 hardware_subarch and hardware_subarch_data were added as of the x86
 169  * boot protocol 2.07 to help distinguish and support custom x86 boot
 170  * sequences. This enum represents accepted values for the x86
 171  * hardware_subarch.  Custom x86 boot sequences (not X86_SUBARCH_PC) do not
 172  * have or simply *cannot* make use of natural stubs like BIOS or EFI, the
 173  * hardware_subarch can be used on the Linux entry path to revector to a
 174  * subarchitecture stub when needed. This subarchitecture stub can be used to
 175  * set up Linux boot parameters or for special care to account for nonstandard
 176  * handling of page tables.
 177  *
 178  * These enums should only ever be used by x86 code, and the code that uses
 179  * it should be well contained and compartmentalized.
 180  *
 181  * KVM and Xen HVM do not have a subarch as these are expected to follow
 182  * standard x86 boot entries. If there is a genuine need for "hypervisor" type
 183  * that should be considered separately in the future. Future guest types
 184  * should seriously consider working with standard x86 boot stubs such as
 185  * the BIOS or EFI boot stubs.
 186  *
 187  * WARNING: this enum is only used for legacy hacks, for platform features that
 188  *          are not easily enumerated or discoverable. You should not ever use
 189  *          this for new features.
 190  *
 191  * @X86_SUBARCH_PC: Should be used if the hardware is enumerable using standard
 192  *      PC mechanisms (PCI, ACPI) and doesn't need a special boot flow.
 193  * @X86_SUBARCH_LGUEST: Used for x86 hypervisor demo, lguest, deprecated
 194  * @X86_SUBARCH_XEN: Used for Xen guest types which follow the PV boot path,
 195  *      which start at asm startup_xen() entry point and later jump to the C
 196  *      xen_start_kernel() entry point. Both domU and dom0 type of guests are
 197  *      currently supported through this PV boot path.
 198  * @X86_SUBARCH_INTEL_MID: Used for Intel MID (Mobile Internet Device) platform
 199  *      systems which do not have the PCI legacy interfaces.
 200  * @X86_SUBARCH_CE4100: Used for Intel CE media processor (CE4100) SoC
 201  *      for settop boxes and media devices, the use of a subarch for CE4100
 202  *      is more of a hack...
 203  */
 204 enum x86_hardware_subarch {
 205         X86_SUBARCH_PC = 0,
 206         X86_SUBARCH_LGUEST,
 207         X86_SUBARCH_XEN,
 208         X86_SUBARCH_INTEL_MID,
 209         X86_SUBARCH_CE4100,
 210         X86_NR_SUBARCHS,
 211 };
 212
 213 #endif /* __ASSEMBLY__ */
 214
 215 #endif /* _ASM_X86_BOOTPARAM_H */