| 1 | #include <e9print.h> |
| 2 | #include <stdint.h> |
| 3 | #include <multiboot2.h> |
| 4 | |
| 5 | struct multiboot_info { |
| 6 | uint32_t size; |
| 7 | uint32_t reserved; |
| 8 | struct multiboot_tag *first; |
| 9 | }; |
| 10 | |
| 11 | void multiboot2_main(uint32_t magic, struct multiboot_info* mb_info_addr) { |
| 12 | if (magic != MULTIBOOT2_BOOTLOADER_MAGIC) { |
| 13 | e9_printf("multiboot2: Invalid magic: %x\n", magic); |
| 14 | goto out; |
| 15 | } |
| 16 | |
| 17 | e9_printf("Welcome to the multiboot2 test kernel: "); |
| 18 | e9_printf("\t size=%d", mb_info_addr->size); |
| 19 | e9_printf("\t reserved=%d", mb_info_addr->reserved); |
| 20 | |
| 21 | e9_print("\nTags:\n"); |
| 22 | |
| 23 | size_t add_size = 0; |
| 24 | |
| 25 | // NOTE: We set i to 8 to skip size and reserved fields: |
| 26 | for (size_t i = 8; i < mb_info_addr->size; i += add_size) { |
| 27 | struct multiboot_tag *tag = (struct multiboot_tag *)((uint8_t *)mb_info_addr + i); |
| 28 | |
| 29 | if (tag->type == MULTIBOOT_TAG_TYPE_END) { |
| 30 | break; |
| 31 | } |
| 32 | |
| 33 | switch (tag->type) { |
| 34 | case MULTIBOOT_TAG_TYPE_CMDLINE: { |
| 35 | struct multiboot_tag_string *cmdline = (struct multiboot_tag_string *)tag; |
| 36 | e9_printf("\t cmdline:"); |
| 37 | e9_printf("\t\t string=%s", cmdline->string); |
| 38 | break; |
| 39 | } |
| 40 | |
| 41 | case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME: { |
| 42 | struct multiboot_tag_string *name = (struct multiboot_tag_string *)tag; |
| 43 | e9_printf("\t bootloader_name:"); |
| 44 | e9_printf("\t\t string=%s", name->string); |
| 45 | break; |
| 46 | } |
| 47 | |
| 48 | case MULTIBOOT_TAG_TYPE_ACPI_OLD: { |
| 49 | struct multiboot_tag_old_acpi *old_acpi = (struct multiboot_tag_old_acpi *)tag; |
| 50 | e9_printf("\t acpi_old:"); |
| 51 | e9_printf("\t\t rsdp=%s", old_acpi->rsdp); |
| 52 | break; |
| 53 | } |
| 54 | |
| 55 | case MULTIBOOT_TAG_TYPE_ACPI_NEW: { |
| 56 | struct multiboot_tag_new_acpi *new_acpi = (struct multiboot_tag_new_acpi *)tag; |
| 57 | e9_printf("\t acpi_new:"); |
| 58 | e9_printf("\t\t rsdp=%s", new_acpi->rsdp); |
| 59 | break; |
| 60 | } |
| 61 | |
| 62 | case MULTIBOOT_TAG_TYPE_MODULE: { |
| 63 | struct multiboot_tag_module *module = (struct multiboot_tag_module *)tag; |
| 64 | e9_printf("\t module:"); |
| 65 | e9_printf("\t\t mod_start=%x", module->mod_start); |
| 66 | e9_printf("\t\t mod_end=%x", module->mod_end); |
| 67 | e9_printf("\t\t cmdline=%s", module->cmdline); |
| 68 | break; |
| 69 | } |
| 70 | |
| 71 | case MULTIBOOT_TAG_TYPE_BASIC_MEMINFO: { |
| 72 | struct multiboot_tag_basic_meminfo *meminfo = (struct multiboot_tag_basic_meminfo *)tag; |
| 73 | e9_printf("\t basic_meminfo:"); |
| 74 | e9_printf("\t\t mem_lower=%x", meminfo->mem_lower); |
| 75 | e9_printf("\t\t mem_upper=%x", meminfo->mem_upper); |
| 76 | break; |
| 77 | } |
| 78 | |
| 79 | // unimplemented(Andy-Python-Programmer): MULTIBOOT_TAG_TYPE_BOOTDEV |
| 80 | |
| 81 | case MULTIBOOT_TAG_TYPE_MMAP: { |
| 82 | struct multiboot_tag_mmap *mmap = (struct multiboot_tag_mmap *)tag; |
| 83 | e9_printf("\t mmap:"); |
| 84 | e9_printf("\t\t entry_size=%d", mmap->entry_size); |
| 85 | e9_printf("\t\t entry_version=%d", mmap->entry_version); |
| 86 | e9_printf("\t\t entries:"); |
| 87 | |
| 88 | struct multiboot_mmap_entry *m = (struct multiboot_mmap_entry *)(mmap->entries); |
| 89 | |
| 90 | size_t entry_count = (mmap->size - sizeof(struct multiboot_tag_mmap)) / sizeof(struct multiboot_mmap_entry); |
| 91 | e9_printf("\t\t entry count: %d", entry_count); |
| 92 | |
| 93 | for (size_t i = 0; i < entry_count; i++) { |
| 94 | e9_printf("\t\t\t addr=%x", m[i].addr); |
| 95 | e9_printf("\t\t\t len=%x", m[i].len); |
| 96 | e9_printf("\t\t\t type=%x", m[i].type); |
| 97 | } |
| 98 | |
| 99 | break; |
| 100 | } |
| 101 | |
| 102 | case MULTIBOOT_TAG_TYPE_EFI_MMAP: { |
| 103 | struct multiboot_tag_efi_mmap *mmap = (struct multiboot_tag_efi_mmap *)tag; |
| 104 | e9_printf("\t efi_mmap:"); |
| 105 | e9_printf("\t\t descr_vers=%d", mmap->descr_vers); |
| 106 | e9_printf("\t\t descr_size=%d", mmap->descr_size); |
| 107 | e9_printf("\t\t size=%d", mmap->size); |
| 108 | e9_printf("\t\t entries:"); |
| 109 | |
| 110 | struct memory_descriptor { |
| 111 | uint32_t type; |
| 112 | uint32_t pad; |
| 113 | uint64_t physical_start; |
| 114 | uint64_t virtual_start; |
| 115 | uint64_t pages; |
| 116 | uint64_t attribute; |
| 117 | }; |
| 118 | |
| 119 | size_t entry_count = (mmap->size - sizeof(struct multiboot_tag_efi_mmap)) / mmap->descr_size; |
| 120 | e9_printf("\t\t entry count: %d", entry_count); |
| 121 | |
| 122 | for (size_t i = 0; i < entry_count; i++) { |
| 123 | struct memory_descriptor *m = (struct memory_descriptor *)(mmap->efi_mmap + i * mmap->descr_size); |
| 124 | |
| 125 | e9_printf("\t\t\t type=%x", m->type); |
| 126 | e9_printf("\t\t\t physical_start=%x", m->physical_start); |
| 127 | e9_printf("\t\t\t virtual_start=%x", m->virtual_start); |
| 128 | e9_printf("\t\t\t pages=%x", m->pages); |
| 129 | e9_printf("\t\t\t attribute=%x", m->attribute); |
| 130 | } |
| 131 | |
| 132 | break; |
| 133 | } |
| 134 | |
| 135 | // unimplemented(Andy-Python-Programmer): MULTIBOOT_TAG_TYPE_VBE |
| 136 | |
| 137 | case MULTIBOOT_TAG_TYPE_FRAMEBUFFER: { |
| 138 | struct multiboot_tag_framebuffer *fb = (struct multiboot_tag_framebuffer *)tag; |
| 139 | |
| 140 | e9_printf("\t framebuffer:"); |
| 141 | e9_printf("\t\t framebuffer_pitch: %d", fb->common.framebuffer_pitch); |
| 142 | e9_printf("\t\t framebuffer_width: %d", fb->common.framebuffer_width); |
| 143 | e9_printf("\t\t framebuffer_height: %d", fb->common.framebuffer_height); |
| 144 | e9_printf("\t\t framebuffer_bpp: %d", fb->common.framebuffer_bpp); |
| 145 | e9_printf("\t\t framebuffer_type: %d", fb->common.framebuffer_type); |
| 146 | e9_printf("\t\t framebuffer_address: %x", fb->common.framebuffer_addr); |
| 147 | |
| 148 | switch (fb->common.framebuffer_type) { |
| 149 | case MULTIBOOT_FRAMEBUFFER_TYPE_RGB: { |
| 150 | e9_printf("\t\t framebuffer_red_field_position: %x", fb->framebuffer_red_field_position); |
| 151 | e9_printf("\t\t framebuffer_red_mask_size: %x", fb->framebuffer_red_mask_size); |
| 152 | e9_printf("\t\t framebuffer_green_field_position: %x", fb->framebuffer_green_field_position); |
| 153 | e9_printf("\t\t framebuffer_green_mask_size: %x", fb->framebuffer_green_mask_size); |
| 154 | e9_printf("\t\t framebuffer_blue_field_position: %x", fb->framebuffer_blue_field_position); |
| 155 | e9_printf("\t\t framebuffer_blue_mask_size: %x", fb->framebuffer_blue_mask_size); |
| 156 | break; |
| 157 | } |
| 158 | |
| 159 | // Rest are unimplemented(Andy-Python-Programmer): |
| 160 | } |
| 161 | |
| 162 | break; |
| 163 | } |
| 164 | |
| 165 | case MULTIBOOT_TAG_TYPE_NETWORK: { |
| 166 | struct multiboot_tag_network *network = (struct multiboot_tag_network *)tag; |
| 167 | e9_printf("\t network tag exists"); |
| 168 | break; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | add_size = tag->size; |
| 173 | |
| 174 | // Align the size to 8 bytes. |
| 175 | if ((add_size % 8) != 0) |
| 176 | add_size += (8 - add_size % 8); |
| 177 | } |
| 178 | |
| 179 | out: |
| 180 | for (;;); |
| 181 | } |
