| 1 | #include <e9print.h> |
| 2 | #include <stdint.h> |
| 3 | #include <multiboot1.h> |
| 4 | |
| 5 | #define MULTIBOOT_BOOTLOADER_MAGIC 0x2badb002 |
| 6 | |
| 7 | void multiboot_main(uint32_t magic, struct multiboot1_info *info) { |
| 8 | if (magic != MULTIBOOT_BOOTLOADER_MAGIC) { |
| 9 | e9_printf("multiboot: Invalid magic: %x\n", magic); |
| 10 | goto out; |
| 11 | } |
| 12 | |
| 13 | e9_printf("Welcome to the multiboot1 test kernel: "); |
| 14 | |
| 15 | e9_printf("\t flags: %x", info->flags); |
| 16 | |
| 17 | e9_printf("\t mem_lower: %x", info->mem_lower); |
| 18 | e9_printf("\t mem_upper: %x", info->mem_upper); |
| 19 | |
| 20 | e9_printf("\t boot_device: %x", info->boot_device); |
| 21 | e9_printf("\t cmdline: %s", info->cmdline); |
| 22 | |
| 23 | { |
| 24 | struct multiboot1_module *start = (struct multiboot1_module *)info->mods_addr; |
| 25 | struct multiboot1_module *end = (struct multiboot1_module *)(info->mods_addr + info->mods_count); |
| 26 | |
| 27 | e9_printf("\t modules:"); |
| 28 | for (struct multiboot1_module* entry = start; entry < end; entry++) { |
| 29 | e9_printf("\t\t begin=%x", entry->begin); |
| 30 | e9_printf("\t\t end=%x", entry->end); |
| 31 | e9_printf("\t\t cmdline=%s", entry->cmdline); |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | { |
| 36 | struct multiboot1_mmap_entry *start = (struct multiboot1_mmap_entry *)info->mmap_addr; |
| 37 | struct multiboot1_mmap_entry *end = (struct multiboot1_mmap_entry *)(info->mmap_addr + info->mmap_length); |
| 38 | |
| 39 | e9_printf("\t usable_entries_mmap:"); |
| 40 | |
| 41 | size_t total_mem = 0; |
| 42 | |
| 43 | // For now we only print the usable memory map entries since |
| 44 | // printing the whole memory map blows my terminal up. We also |
| 45 | // iterate through the available memory map entries and add up |
| 46 | // to find the total amount of usable memory. |
| 47 | for (struct multiboot1_mmap_entry* entry = start; entry < end; entry++) { |
| 48 | // Check if the memory map entry is marked as usable! |
| 49 | if (entry->type != 1) { |
| 50 | continue; |
| 51 | } |
| 52 | |
| 53 | e9_printf("\t\t addr=%x", entry->addr); |
| 54 | e9_printf("\t\t length=%x", entry->len); |
| 55 | e9_printf("\t\t type=Usable"); |
| 56 | |
| 57 | // Now this might be a bit confusing since but `entry->size` represents the |
| 58 | // is the size of the associated structure in bytes and `entry->len` represents the |
| 59 | // size of the memory region. |
| 60 | total_mem += entry->len; |
| 61 | } |
| 62 | |
| 63 | e9_printf("Total usable memory: %x", total_mem); |
| 64 | } |
| 65 | |
| 66 | // TODO(Andy-Python-Programmer): Drives are unimplemented |
| 67 | // TODO(Andy-Python-Programmer): ROM config is unimplemented |
| 68 | |
| 69 | e9_printf("\t bootloader_name: %s", info->bootloader_name); |
| 70 | |
| 71 | // TODO(Andy-Python-Programmer): APM table is unimplemented |
| 72 | // TODO(Andy-Python-Programmer): VBE tag is unimplemented |
| 73 | |
| 74 | e9_printf("\t fb_addr: %x", info->fb_addr); |
| 75 | e9_printf("\t fb_pitch: %x", info->fb_pitch); |
| 76 | e9_printf("\t fb_width: %x", info->fb_width); |
| 77 | e9_printf("\t fb_height: %x", info->fb_height); |
| 78 | e9_printf("\t fb_bpp: %x", info->fb_bpp); |
| 79 | e9_printf("\t fb_type: %x", info->fb_type); |
| 80 | |
| 81 | e9_printf("\t fb_red_mask_shift: %x", info->fb_red_mask_shift); |
| 82 | e9_printf("\t fb_red_mask_size: %x", info->fb_red_mask_size); |
| 83 | |
| 84 | e9_printf("\t fb_green_mask_shift: %x", info->fb_green_mask_shift); |
| 85 | e9_printf("\t fb_green_mask_size: %x", info->fb_green_mask_size); |
| 86 | |
| 87 | e9_printf("\t fb_blue_mask_shift: %x", info->fb_blue_mask_shift); |
| 88 | e9_printf("\t fb_blue_mask_size: %x", info->fb_blue_mask_size); |
| 89 | |
| 90 | out: |
| 91 | for (;;); |
| 92 | } |
