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/* setup_data types */ 6#define SETUP_NONE 0 7#define SETUP_E820_EXT 1 8#define SETUP_DTB 2 9#define SETUP_PCI 3 10#define SETUP_EFI 4 11#define SETUP_APPLE_PROPERTIES 5 12 13/* ram_size flags */ 14#define RAMDISK_IMAGE_START_MASK 0x07FF 15#define RAMDISK_PROMPT_FLAG 0x8000 16#define RAMDISK_LOAD_FLAG 0x4000 17 18/* loadflags */ 19#define LOADED_HIGH (1<<0) 20#define KASLR_FLAG (1<<1) 21#define QUIET_FLAG (1<<5) 22#define KEEP_SEGMENTS (1<<6) 23#define CAN_USE_HEAP (1<<7) 24 25/* xloadflags */ 26#define XLF_KERNEL_64 (1<<0) 27#define XLF_CAN_BE_LOADED_ABOVE_4G (1<<1) 28#define XLF_EFI_HANDOVER_32 (1<<2) 29#define XLF_EFI_HANDOVER_64 (1<<3) 30#define XLF_EFI_KEXEC (1<<4) 31 32#ifndef __ASSEMBLY__ 33 34#include <linux/types.h> 35#include <linux/screen_info.h> 36#include <linux/apm_bios.h> 37#include <linux/edd.h> 38#include <asm/ist.h> 39#include <video/edid.h> 40 41/* extensible setup data list node */ 42struct setup_data { 43 __u64 next; 44 __u32 type; 45 __u32 len; 46 __u8 data[0]; 47}; 48 49struct setup_header { 50 __u8 setup_sects; 51 __u16 root_flags; 52 __u32 syssize; 53 __u16 ram_size; 54 __u16 vid_mode; 55 __u16 root_dev; 56 __u16 boot_flag; 57 __u16 jump; 58 __u32 header; 59 __u16 version; 60 __u32 realmode_swtch; 61 __u16 start_sys_seg; 62 __u16 kernel_version; 63 __u8 type_of_loader; 64 __u8 loadflags; 65 __u16 setup_move_size; 66 __u32 code32_start; 67 __u32 ramdisk_image; 68 __u32 ramdisk_size; 69 __u32 bootsect_kludge; 70 __u16 heap_end_ptr; 71 __u8 ext_loader_ver; 72 __u8 ext_loader_type; 73 __u32 cmd_line_ptr; 74 __u32 initrd_addr_max; 75 __u32 kernel_alignment; 76 __u8 relocatable_kernel; 77 __u8 min_alignment; 78 __u16 xloadflags; 79 __u32 cmdline_size; 80 __u32 hardware_subarch; 81 __u64 hardware_subarch_data; 82 __u32 payload_offset; 83 __u32 payload_length; 84 __u64 setup_data; 85 __u64 pref_address; 86 __u32 init_size; 87 __u32 handover_offset; 88} __attribute__((packed)); 89 90struct sys_desc_table { 91 __u16 length; 92 __u8 table[14]; 93}; 94 95/* Gleaned from OFW's set-parameters in cpu/x86/pc/linux.fth */ 96struct olpc_ofw_header { 97 __u32 ofw_magic; /* OFW signature */ 98 __u32 ofw_version; 99 __u32 cif_handler; /* callback into OFW */ 100 __u32 irq_desc_table; 101} __attribute__((packed)); 102 103struct efi_info { 104 __u32 efi_loader_signature; 105 __u32 efi_systab; 106 __u32 efi_memdesc_size; 107 __u32 efi_memdesc_version; 108 __u32 efi_memmap; 109 __u32 efi_memmap_size; 110 __u32 efi_systab_hi; 111 __u32 efi_memmap_hi; 112}; 113 114/* 115 * This is the maximum number of entries in struct boot_params::e820_table 116 * (the zeropage), which is part of the x86 boot protocol ABI: 117 */ 118#define E820_MAX_ENTRIES_ZEROPAGE 128 119 120/* 121 * The E820 memory region entry of the boot protocol ABI: 122 */ 123struct boot_e820_entry { 124 __u64 addr; 125 __u64 size; 126 __u32 type; 127} __attribute__((packed)); 128 129/* The so-called "zeropage" */ 130struct boot_params { 131 struct screen_info screen_info; /* 0x000 */ 132 struct apm_bios_info apm_bios_info; /* 0x040 */ 133 __u8 _pad2[4]; /* 0x054 */ 134 __u64 tboot_addr; /* 0x058 */ 135 struct ist_info ist_info; /* 0x060 */ 136 __u8 _pad3[16]; /* 0x070 */ 137 __u8 hd0_info[16]; /* obsolete! */ /* 0x080 */ 138 __u8 hd1_info[16]; /* obsolete! */ /* 0x090 */ 139 struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */ 140 struct olpc_ofw_header olpc_ofw_header; /* 0x0b0 */ 141 __u32 ext_ramdisk_image; /* 0x0c0 */ 142 __u32 ext_ramdisk_size; /* 0x0c4 */ 143 __u32 ext_cmd_line_ptr; /* 0x0c8 */ 144 __u8 _pad4[116]; /* 0x0cc */ 145 struct edid_info edid_info; /* 0x140 */ 146 struct efi_info efi_info; /* 0x1c0 */ 147 __u32 alt_mem_k; /* 0x1e0 */ 148 __u32 scratch; /* Scratch field! */ /* 0x1e4 */ 149 __u8 e820_entries; /* 0x1e8 */ 150 __u8 eddbuf_entries; /* 0x1e9 */ 151 __u8 edd_mbr_sig_buf_entries; /* 0x1ea */ 152 __u8 kbd_status; /* 0x1eb */ 153 __u8 secure_boot; /* 0x1ec */ 154 __u8 _pad5[2]; /* 0x1ed */ 155 /* 156 * The sentinel is set to a nonzero value (0xff) in header.S. 157 * 158 * A bootloader is supposed to only take setup_header and put 159 * it into a clean boot_params buffer. If it turns out that 160 * it is clumsy or too generous with the buffer, it most 161 * probably will pick up the sentinel variable too. The fact 162 * that this variable then is still 0xff will let kernel 163 * know that some variables in boot_params are invalid and 164 * kernel should zero out certain portions of boot_params. 165 */ 166 __u8 sentinel; /* 0x1ef */ 167 __u8 _pad6[1]; /* 0x1f0 */ 168 struct setup_header hdr; /* setup header */ /* 0x1f1 */ 169 __u8 _pad7[0x290-0x1f1-sizeof(struct setup_header)]; 170 __u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX]; /* 0x290 */ 171 struct boot_e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */ 172 __u8 _pad8[48]; /* 0xcd0 */ 173 struct edd_info eddbuf[EDDMAXNR]; /* 0xd00 */ 174 __u8 _pad9[276]; /* 0xeec */ 175} __attribute__((packed)); 176 177/** 178 * enum x86_hardware_subarch - x86 hardware subarchitecture 179 * 180 * The x86 hardware_subarch and hardware_subarch_data were added as of the x86 181 * boot protocol 2.07 to help distinguish and support custom x86 boot 182 * sequences. This enum represents accepted values for the x86 183 * hardware_subarch. Custom x86 boot sequences (not X86_SUBARCH_PC) do not 184 * have or simply *cannot* make use of natural stubs like BIOS or EFI, the 185 * hardware_subarch can be used on the Linux entry path to revector to a 186 * subarchitecture stub when needed. This subarchitecture stub can be used to 187 * set up Linux boot parameters or for special care to account for nonstandard 188 * handling of page tables. 189 * 190 * These enums should only ever be used by x86 code, and the code that uses 191 * it should be well contained and compartamentalized. 192 * 193 * KVM and Xen HVM do not have a subarch as these are expected to follow 194 * standard x86 boot entries. If there is a genuine need for "hypervisor" type 195 * that should be considered separately in the future. Future guest types 196 * should seriously consider working with standard x86 boot stubs such as 197 * the BIOS or EFI boot stubs. 198 * 199 * WARNING: this enum is only used for legacy hacks, for platform features that 200 * are not easily enumerated or discoverable. You should not ever use 201 * this for new features. 202 * 203 * @X86_SUBARCH_PC: Should be used if the hardware is enumerable using standard 204 * PC mechanisms (PCI, ACPI) and doesn't need a special boot flow. 205 * @X86_SUBARCH_LGUEST: Used for x86 hypervisor demo, lguest, deprecated 206 * @X86_SUBARCH_XEN: Used for Xen guest types which follow the PV boot path, 207 * which start at asm startup_xen() entry point and later jump to the C 208 * xen_start_kernel() entry point. Both domU and dom0 type of guests are 209 * currently supportd through this PV boot path. 210 * @X86_SUBARCH_INTEL_MID: Used for Intel MID (Mobile Internet Device) platform 211 * systems which do not have the PCI legacy interfaces. 212 * @X86_SUBARCH_CE4100: Used for Intel CE media processor (CE4100) SoC for 213 * for settop boxes and media devices, the use of a subarch for CE4100 214 * is more of a hack... 215 */ 216enum x86_hardware_subarch { 217 X86_SUBARCH_PC = 0, 218 X86_SUBARCH_LGUEST, 219 X86_SUBARCH_XEN, 220 X86_SUBARCH_INTEL_MID, 221 X86_SUBARCH_CE4100, 222 X86_NR_SUBARCHS, 223}; 224 225#endif /* __ASSEMBLY__ */ 226 227#endif /* _ASM_X86_BOOTPARAM_H */ 228