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 */ 216