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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Linux/i386 loader
* Supports bzImage, zImage and Image format.
*
* Based on work by Steve Gehlbach.
* Portions are taken from mkelfImage.
*
* 2003-09 by SONE Takeshi
*/
#include <stdint.h>
#include "linux_trampoline.h"
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
#define E820MAX 32 /* number of entries in E820MAP */
struct e820entry {
u64 addr; /* start of memory segment */
u64 size; /* size of memory segment */
u32 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
} __packed;
/* The header of Linux/i386 kernel */
struct linux_header {
u8 reserved1[0x1f1]; /* 0x000 */
u8 setup_sects; /* 0x1f1 */
u16 root_flags; /* 0x1f2 */
u32 syssize; /* 0x1f4 (2.04+) */
u8 reserved2[2]; /* 0x1f8 */
u16 vid_mode; /* 0x1fa */
u16 root_dev; /* 0x1fc */
u16 boot_sector_magic; /* 0x1fe */
/* 2.00+ */
u8 reserved3[2]; /* 0x200 */
u8 header_magic[4]; /* 0x202 */
u16 protocol_version; /* 0x206 */
u32 realmode_swtch; /* 0x208 */
u16 start_sys; /* 0x20c */
u16 kver_addr; /* 0x20e */
u8 type_of_loader; /* 0x210 */
u8 loadflags; /* 0x211 */
u16 setup_move_size; /* 0x212 */
u32 code32_start; /* 0x214 */
u32 ramdisk_image; /* 0x218 */
u32 ramdisk_size; /* 0x21c */
u8 reserved4[4]; /* 0x220 */
/* 2.01+ */
u16 heap_end_ptr; /* 0x224 */
u8 reserved5[2]; /* 0x226 */
/* 2.02+ */
u32 cmd_line_ptr; /* 0x228 */
/* 2.03+ */
u32 initrd_addr_max; /* 0x22c */
/* 2.05+ */
u32 kernel_alignment; /* 0x230 */
u8 relocatable_kernel; /* 0x234 */
u8 min_alignment; /* 0x235 (2.10+) */
u8 reserved6[2]; /* 0x236 */
/* 2.06+ */
u32 cmdline_size; /* 0x238 */
/* 2.07+ */
u32 hardware_subarch; /* 0x23c */
u64 hardware_subarch_data;/* 0x240 */
/* 2.08+ */
u32 payload_offset; /* 0x248 */
u32 payload_length; /* 0x24c */
/* 2.09+ */
u64 setup_data; /* 0x250 */
/* 2.10+ */
u64 pref_address; /* 0x258 */
u32 init_size; /* 0x260 */
} __packed;
/* Parameters passed to 32-bit part of Linux
* This is another view of the structure above.. */
struct linux_params {
u8 orig_x; /* 0x00 */
u8 orig_y; /* 0x01 */
u16 ext_mem_k; /* 0x02 -- EXT_MEM_K sits here */
u16 orig_video_page; /* 0x04 */
u8 orig_video_mode; /* 0x06 */
u8 orig_video_cols; /* 0x07 */
u16 unused2; /* 0x08 */
u16 orig_video_ega_bx; /* 0x0a */
u16 unused3; /* 0x0c */
u8 orig_video_lines; /* 0x0e */
u8 orig_video_isVGA; /* 0x0f */
u16 orig_video_points; /* 0x10 */
/* VESA graphic mode -- linear frame buffer */
u16 lfb_width; /* 0x12 */
u16 lfb_height; /* 0x14 */
u16 lfb_depth; /* 0x16 */
u32 lfb_base; /* 0x18 */
u32 lfb_size; /* 0x1c */
u16 cl_magic; /* 0x20 */
#define CL_MAGIC_VALUE 0xA33F
u16 cl_offset; /* 0x22 */
u16 lfb_linelength; /* 0x24 */
u8 red_size; /* 0x26 */
u8 red_pos; /* 0x27 */
u8 green_size; /* 0x28 */
u8 green_pos; /* 0x29 */
u8 blue_size; /* 0x2a */
u8 blue_pos; /* 0x2b */
u8 rsvd_size; /* 0x2c */
u8 rsvd_pos; /* 0x2d */
u16 vesapm_seg; /* 0x2e */
u16 vesapm_off; /* 0x30 */
u16 pages; /* 0x32 */
u8 reserved4[12]; /* 0x34 -- 0x3f reserved for future expansion */
//struct apm_bios_info apm_bios_info; /* 0x40 */
u8 apm_bios_info[0x40];
//struct drive_info_struct drive_info; /* 0x80 */
u8 drive_info[0x20];
//struct sys_desc_table sys_desc_table; /* 0xa0 */
u8 sys_desc_table[0x140];
u32 alt_mem_k; /* 0x1e0 */
u8 reserved5[4]; /* 0x1e4 */
u8 e820_map_nr; /* 0x1e8 */
u8 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. */
u8 setup_hdr; /* 0x1f1 */
u16 mount_root_rdonly; /* 0x1f2 */
u8 reserved7[4]; /* 0x1f4 */
u16 ramdisk_flags; /* 0x1f8 */
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
u8 reserved8[2]; /* 0x1fa */
u16 orig_root_dev; /* 0x1fc */
u8 reserved9[1]; /* 0x1fe */
u8 aux_device_info; /* 0x1ff */
u8 reserved10[2]; /* 0x200 */
u8 param_block_signature[4]; /* 0x202 */
u16 param_block_version; /* 0x206 */
u8 reserved11[8]; /* 0x208 */
u8 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
u8 loader_flags; /* 0x211 */
u8 reserved12[2]; /* 0x212 */
u32 kernel_start; /* 0x214 */
u32 initrd_start; /* 0x218 */
u32 initrd_size; /* 0x21c */
u8 reserved12_5[8]; /* 0x220 */
u32 cmd_line_ptr; /* 0x228 */
u32 initrd_addr_max; /* 0x22c */
u32 kernel_alignment; /* 0x230 */
u8 relocatable_kernel; /* 0x234 */
u8 reserved13[0x2b]; /* 0x235 */
u32 init_size; /* 0x260 */
u8 reserved14[0x6c]; /* 0x264 */
struct e820entry e820_map[E820MAX]; /* 0x2d0 */
u8 reserved16[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 */
u8 command_line[COMMAND_LINE_SIZE]; /* 0x800 */
u8 reserved17[1792]; /* 0x900 - 0x1000 */
};
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