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linux_params.h
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linux_params.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Linux Params struct definition
*
* Copied and adapted from coreboot's cbfstool
*
* 2003-09 by SONE Takeshi
*/
#ifndef LINUX_PARAMS_H
#define LINUX_PARAMS_H
#include <stdint.h>
#define LINUX_HEADER_OFFSET 0x1f1
// Macro that encodes the used Linux boot protocol version according to the spec.
#define TO_LINUX_BOOT_HEADER_VERSION(major, minor) \
((major) << 8 | (minor))
#define E820MAX 32 /* number of entries in E820MAP */
struct e820entry {
uint64_t addr; /* start of memory segment */
uint64_t size; /* size of memory segment */
uint32_t type; /* type of memory segment */
#define E820_RAM 1
#define E820_RESERVED 2
#define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
#define E820_NVS 4
};
/* Parameters passed to 32-bit part of Linux */
struct linux_params {
uint8_t orig_x; /* 0x00 */
uint8_t orig_y; /* 0x01 */
uint16_t ext_mem_k; /* 0x02 -- EXT_MEM_K sits here */
uint16_t orig_video_page; /* 0x04 */
uint8_t orig_video_mode; /* 0x06 */
uint8_t orig_video_cols; /* 0x07 */
uint16_t unused2; /* 0x08 */
uint16_t orig_video_ega_bx; /* 0x0a */
uint16_t unused3; /* 0x0c */
uint8_t orig_video_lines; /* 0x0e */
uint8_t orig_video_isVGA; /* 0x0f */
uint16_t orig_video_points; /* 0x10 */
/* VESA graphic mode -- linear frame buffer */
uint16_t lfb_width; /* 0x12 */
uint16_t lfb_height; /* 0x14 */
uint16_t lfb_depth; /* 0x16 */
uint32_t lfb_base; /* 0x18 */
uint32_t lfb_size; /* 0x1c */
uint16_t cl_magic; /* 0x20 */
#define CL_MAGIC_VALUE 0xA33F
uint16_t cl_offset; /* 0x22 */
uint16_t lfb_linelength; /* 0x24 */
uint8_t red_size; /* 0x26 */
uint8_t red_pos; /* 0x27 */
uint8_t green_size; /* 0x28 */
uint8_t green_pos; /* 0x29 */
uint8_t blue_size; /* 0x2a */
uint8_t blue_pos; /* 0x2b */
uint8_t rsvd_size; /* 0x2c */
uint8_t rsvd_pos; /* 0x2d */
uint16_t vesapm_seg; /* 0x2e */
uint16_t vesapm_off; /* 0x30 */
uint16_t pages; /* 0x32 */
uint8_t reserved4[12]; /* 0x34 -- 0x3f reserved for future expansion */
// struct apm_bios_info apm_bios_info; /* 0x40 */
uint8_t apm_bios_info[0x40];
// struct drive_info_struct drive_info; /* 0x80 */
uint8_t drive_info[0x20];
// struct sys_desc_table sys_desc_table; /* 0xa0 */
uint8_t sys_desc_table[0x140];
uint32_t alt_mem_k; /* 0x1e0 */
uint8_t reserved5[4]; /* 0x1e4 */
uint8_t e820_map_nr; /* 0x1e8 */
uint8_t reserved6[8]; /* 0x1e9 */
/* This next variable is to show where
* in this struct the Linux setup_hdr
* is located. It does not get filled in.
* We may someday find it useful to use
* its address. */
uint8_t setup_hdr; /* 0x1f1 */
uint16_t mount_root_rdonly; /* 0x1f2 */
uint8_t reserved7[4]; /* 0x1f4 */
uint16_t ramdisk_flags; /* 0x1f8 */
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
uint8_t reserved8[2]; /* 0x1fa */
uint16_t orig_root_dev; /* 0x1fc */
uint8_t reserved9[1]; /* 0x1fe */
uint8_t aux_device_info; /* 0x1ff */
uint8_t reserved10[2]; /* 0x200 */
uint8_t param_block_signature[4]; /* 0x202 */
uint16_t param_block_version; /* 0x206 */
uint8_t reserved11[8]; /* 0x208 */
uint8_t loader_type; /* 0x210 */
#define LOADER_TYPE_LOADLIN 1
#define LOADER_TYPE_BOOTSECT_LOADER 2
#define LOADER_TYPE_SYSLINUX 3
#define LOADER_TYPE_ETHERBOOT 4
#define LOADER_TYPE_KERNEL 5
uint8_t loader_flags; /* 0x211 */
uint8_t reserved12[2]; /* 0x212 */
uint32_t kernel_start; /* 0x214 */
uint32_t initrd_start; /* 0x218 */
uint32_t initrd_size; /* 0x21c */
uint8_t reserved13[8]; /* 0x220 */
uint32_t cmd_line_ptr; /* 0x228 */
uint32_t initrd_addr_max; /* 0x22c */
uint32_t kernel_alignment; /* 0x230 */
uint8_t relocatable_kernel; /* 0x234 */
uint8_t min_alignment; /* 0x235 */
uint16_t xloadflags; /* 0x236 */
uint32_t cmdline_size; /* 0x238 */
uint32_t hardware_subarch; /* 0x23C */
uint64_t hardware_subarch_data; /* 0x240 */
uint32_t payload_offset; /* 0x248 */
uint32_t payload_length; /* 0x24c */
uint64_t setup_data; /* 0x250 */
uint64_t pref_address; /* 0x258 */
uint32_t init_size; /* 0x260 */
uint8_t reserved14[0x6c]; /* 0x264 */
struct e820entry e820_map[E820MAX]; /* 0x2d0 */
uint8_t reserved15[688]; /* 0x550 */
#define COMMAND_LINE_SIZE 256
/* Command line is copied here by 32-bit i386/kernel/head.S.
* So I will follow the boot protocol, rather than putting it
* directly here. --ts1 */
uint8_t command_line[COMMAND_LINE_SIZE]; /* 0x800 */
uint8_t reserved16[1792]; /* 0x900 - 0x1000 */
};
#endif /* LINUX_PARAMS_H */