/** * @file multiboot2.h * @brief multiboot2 解析 */ #pragma once #include "stdint.h" #include "common.h" /// @see Multiboot2 Specification version 2.0.pdf // 启动后，在 32 位内核进入点，机器状态如下： // 1. CS 指向基地址为 0x00000000，限长为4G – 1的代码段描述符。 // 2. DS，SS，ES，FS 和 GS 指向基地址为0x00000000，限长为4G – // 1的数据段描述符。 // 3. A20 地址线已经打开。 // 4. 页机制被禁止。 // 5. 中断被禁止。 // 6. EAX = 0x2BADB002 // 7. 系统信息和启动信息块的线性地址保存在 EBX中（相当于一个指针）。 // 以下即为这个信息块的结构 /** * @brief MULTIBOOT2 接口抽象 */ extern uint32_t multiboot2_magic; extern uintptr_t multiboot2_boot_info_addr; /* How many bytes from the start of the file we search for the header. */ static const uint32_t MULTIBOOT_SEARCH = 32768; static const uint32_t MULTIBOOT_HEADER_ALIGN = 8; /* The magic field should contain this. */ static const uint32_t MULTIBOOT2_HEADER_MAGIC = 0xe85250d6; /* This should be in %eax. */ static const uint32_t MULTIBOOT2_BOOTLOADER_MAGIC = 0x36d76289; /* Alignment of multiboot modules. */ static const uint32_t MULTIBOOT_MOD_ALIGN = 0x00001000; /* Alignment of the multiboot info structure. */ static const uint32_t MULTIBOOT_INFO_ALIGN = 0x00000008; /* Flags set in the 'flags' member of the multiboot header. */ static const uint32_t MULTIBOOT_TAG_ALIGN = 8; static const uint32_t MULTIBOOT_TAG_TYPE_END = 0; static const uint32_t MULTIBOOT_TAG_TYPE_CMDLINE = 1; static const uint32_t MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME = 2; static const uint32_t MULTIBOOT_TAG_TYPE_MODULE = 3; static const uint32_t MULTIBOOT_TAG_TYPE_BASIC_MEMINFO = 4; static const uint32_t MULTIBOOT_TAG_TYPE_BOOTDEV = 5; static const uint32_t MULTIBOOT_TAG_TYPE_MMAP = 6; static const uint32_t MULTIBOOT_TAG_TYPE_VBE = 7; static const uint32_t MULTIBOOT_TAG_TYPE_FRAMEBUFFER = 8; static const uint32_t MULTIBOOT_TAG_TYPE_ELF_SECTIONS = 9; static const uint32_t MULTIBOOT_TAG_TYPE_APM = 10; static const uint32_t MULTIBOOT_TAG_TYPE_EFI32 = 11; static const uint32_t MULTIBOOT_TAG_TYPE_EFI64 = 12; static const uint32_t MULTIBOOT_TAG_TYPE_SMBIOS = 13; static const uint32_t MULTIBOOT_TAG_TYPE_ACPI_OLD = 14; static const uint32_t MULTIBOOT_TAG_TYPE_ACPI_NEW = 15; static const uint32_t MULTIBOOT_TAG_TYPE_NETWORK = 16; static const uint32_t MULTIBOOT_TAG_TYPE_EFI_MMAP = 17; static const uint32_t MULTIBOOT_TAG_TYPE_EFI_BS = 18; static const uint32_t MULTIBOOT_TAG_TYPE_EFI32_IH = 19; static const uint32_t MULTIBOOT_TAG_TYPE_EFI64_IH = 20; static const uint32_t MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR = 21; static const uint32_t MULTIBOOT_HEADER_TAG_END = 0; static const uint32_t MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST = 1; static const uint32_t MULTIBOOT_HEADER_TAG_ADDRESS = 2; static const uint32_t MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS = 3; static const uint32_t MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS = 4; static const uint32_t MULTIBOOT_HEADER_TAG_FRAMEBUFFER = 5; static const uint32_t MULTIBOOT_HEADER_TAG_MODULE_ALIGN = 6; static const uint32_t MULTIBOOT_HEADER_TAG_EFI_BS = 7; static const uint32_t MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI32 = 8; static const uint32_t MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64 = 9; static const uint32_t MULTIBOOT_HEADER_TAG_RELOCATABLE = 10; static const uint32_t MULTIBOOT_ARCHITECTURE_I386 = 0; static const uint32_t MULTIBOOT_ARCHITECTURE_MIPS32 = 4; static const uint32_t MULTIBOOT_HEADER_TAG_OPTIONAL = 1; static const uint32_t MULTIBOOT_LOAD_PREFERENCE_NONE = 0; static const uint32_t MULTIBOOT_LOAD_PREFERENCE_LOW = 1; static const uint32_t MULTIBOOT_LOAD_PREFERENCE_HIGH = 2; static const uint32_t MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED = 1; static const uint32_t MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED = 2; static const uint32_t MULTIBOOT_MEMORY_AVAILABLE = 1; static const uint32_t MULTIBOOT_MEMORY_RESERVED = 2; static const uint32_t MULTIBOOT_MEMORY_ACPI_RECLAIMABLE = 3; static const uint32_t MULTIBOOT_MEMORY_NVS = 4; static const uint32_t MULTIBOOT_MEMORY_BADRAM = 5; struct multiboot_header_t { // Must be MULTIBOOT_MAGIC - see above. uint32_t magic; // ISA uint32_t architecture; // Total header length. uint32_t header_length; // The above fields plus this one must equal 0 mod 2^32. uint32_t checksum; }; struct multiboot_header_tag_t { uint16_t type; uint16_t flags; uint32_t size; }; struct multiboot_header_tag_information_request_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t requests[0]; }; struct multiboot_header_tag_address_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t header_addr; uint32_t load_addr; uint32_t load_end_addr; uint32_t bss_end_addr; }; struct multiboot_header_tag_entry_address_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t entry_addr; }; struct multiboot_header_tag_console_flags_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t console_flags; }; struct multiboot_header_tag_framebuffer_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t width; uint32_t height; uint32_t depth; }; struct multiboot_header_tag_module_align_t { uint16_t type; uint16_t flags; uint32_t size; }; struct multiboot_header_tag_relocatable_t { uint16_t type; uint16_t flags; uint32_t size; uint32_t min_addr; uint32_t max_addr; uint32_t align; uint32_t preference; }; struct multiboot_color_t { uint8_t red; uint8_t green; uint8_t blue; }; // multiboot2协议的内存区域信息 struct multiboot_mmap_entry_t { uint64_t addr; uint64_t len; uint32_t type; uint32_t reserved; }; struct multiboot_tag_t { uint32_t type; uint32_t size; }; struct multiboot_tag_string_t { struct multiboot_tag_t tag_t; char string[0]; }; struct multiboot_tag_module_t { struct multiboot_tag_t tag_t; uint32_t mod_start; uint32_t mod_end; char cmdline[0]; }; struct multiboot_tag_basic_meminfo_t { struct multiboot_tag_t tag_t; uint32_t mem_lower; uint32_t mem_upper; }; struct multiboot_tag_bootdev_t { struct multiboot_tag_t tag_t; uint32_t biosdev; uint32_t slice; uint32_t part; }; struct multiboot_tag_mmap_t { struct multiboot_tag_t tag_t; uint32_t entry_size; uint32_t entry_version; struct multiboot_mmap_entry_t entries[0]; }; struct multiboot_vbe_info_block_t { uint8_t external_specification[512]; }; struct multiboot_vbe_mode_info_block_t { uint8_t external_specification[256]; }; // bootloader传递的VBE信息的结构体 struct multiboot_tag_vbe_t { struct multiboot_tag_t tag_t; uint16_t vbe_mode; uint16_t vbe_interface_seg; uint16_t vbe_interface_off; uint16_t vbe_interface_len; // The fields ‘vbe_control_info’ and ‘vbe_mode_info’ contain VBE control information returned by the VBE Function 00h and VBE mode information // returned by the VBE Function 01h, respectively. struct multiboot_vbe_info_block_t vbe_control_info; struct multiboot_vbe_mode_info_block_t vbe_mode_info; }; struct multiboot_tag_framebuffer_info_t { struct multiboot_tag_t tag_t; uint64_t framebuffer_addr; uint32_t framebuffer_pitch; // 帧缓存上界 // width and height expressed in pixels except type=2 // when type=2, they are expressed in characters uint32_t framebuffer_width; uint32_t framebuffer_height; // number of bits per pixel. uint8_t framebuffer_bpp; // 帧缓存的类型 uint8_t framebuffer_type; uint8_t reserved; }; // indexed color struct multiboot_tag_framebuffer_info_type0_t { struct multiboot_tag_framebuffer_info_t header; uint32_t framebuffer_palette_num_colors; struct multiboot_color_t color_desc; }; // direct RGB color struct multiboot_tag_framebuffer_info_type1_t { struct multiboot_tag_framebuffer_info_t header; uint8_t framebuffer_red_field_position; uint8_t framebuffer_red_mask_size; uint8_t framebuffer_green_field_position; uint8_t framebuffer_green_mask_size; uint8_t framebuffer_blue_field_position; uint8_t framebuffer_blue_mask_size; }; struct multiboot_tag_elf_sections_t { struct multiboot_tag_t tag_t; uint32_t num; uint32_t entsize; // 段字符串表索引 uint32_t shndx; char sections[0]; }; struct multiboot_tag_apm_t { struct multiboot_tag_t tag_t; uint16_t version; uint16_t cseg; uint32_t offset; uint16_t cseg_16; uint16_t dseg; uint16_t flags; uint16_t cseg_len; uint16_t cseg_16_len; uint16_t dseg_len; }; struct multiboot_tag_efi32_t { struct multiboot_tag_t tag_t; uint32_t pointer; }; struct multiboot_tag_efi64_t { struct multiboot_tag_t tag_t; uint64_t pointer; }; struct multiboot_tag_smbios_t { struct multiboot_tag_t tag_t; uint8_t major; uint8_t minor; uint8_t reserved[6]; uint8_t tables[0]; }; struct multiboot_tag_network_t { struct multiboot_tag_t tag_t; uint8_t dhcpack[0]; }; struct multiboot_tag_efi_mmap_t { struct multiboot_tag_t tag_t; uint32_t descr_size; uint32_t descr_vers; uint8_t efi_mmap[0]; }; struct multiboot_tag_efi32_ih_t { struct multiboot_tag_t tag_t; uint32_t pointer; }; struct multiboot_tag_efi64_ih_t { struct multiboot_tag_t tag_t; uint64_t pointer; }; struct multiboot_tag_load_base_addr_t { struct multiboot_tag_t tag_t; uint32_t load_base_addr; }; // 迭代变量 // 与 multiboot_tag_t 相同 struct iter_data_t { uint32_t type; uint32_t size; }; /** * @brief 初始化 * @return true 成功 * @return false 失败 */ bool multiboot2_init(uint32_t info_addr); /** * @brief 迭代器 * @param _fun 迭代操作 * @param _data 数据 */ void multiboot2_iter(bool (*_fun)(const struct iter_data_t *, void *, uint32_t *), void *_data, uint32_t *count); /** * @brief 获取multiboot2协议提供的内存区域信息 * * @param _iter_data 要被迭代的信息的结构体 * @param _data 返回信息的结构体指针 * @param count 返回数组的长度 * @return true * @return false */ bool multiboot2_get_memory(const struct iter_data_t *_iter_data, void *_data, uint32_t *count); /** * @brief 获取VBE信息 * * @param _iter_data 要被迭代的信息的结构体 * @param _data 返回信息的结构体指针 */ bool multiboot2_get_VBE_info(const struct iter_data_t *_iter_data, void *_data, uint32_t *reserved); /** * @brief 获取帧缓冲区信息 * * @param _iter_data 要被迭代的信息的结构体 * @param _data 返回信息的结构体指针 */ bool multiboot2_get_Framebuffer_info(const struct iter_data_t *_iter_data, void *_data, uint32_t *reserved);