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