93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
#include <e9print.h>
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#include <stdint.h>
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#include <multiboot1.h>
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#define MULTIBOOT_BOOTLOADER_MAGIC 0x2badb002
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void multiboot_main(uint32_t magic, struct multiboot1_info *info) {
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if (magic != MULTIBOOT_BOOTLOADER_MAGIC) {
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e9_printf("multiboot: Invalid magic: %x\n", magic);
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goto out;
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}
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e9_printf("Welcome to the multiboot1 test kernel: ");
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e9_printf("\t flags: %x", info->flags);
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e9_printf("\t mem_lower: %x", info->mem_lower);
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e9_printf("\t mem_upper: %x", info->mem_upper);
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e9_printf("\t boot_device: %x", info->boot_device);
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e9_printf("\t cmdline: %s", info->cmdline);
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{
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struct multiboot1_module *start = (struct multiboot1_module *)info->mods_addr;
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struct multiboot1_module *end = (struct multiboot1_module *)(info->mods_addr + info->mods_count);
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e9_printf("\t modules:");
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for (struct multiboot1_module* entry = start; entry < end; entry++) {
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e9_printf("\t\t begin=%x", entry->begin);
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e9_printf("\t\t end=%x", entry->end);
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e9_printf("\t\t cmdline=%s", entry->cmdline);
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}
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}
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{
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struct multiboot1_mmap_entry *start = (struct multiboot1_mmap_entry *)info->mmap_addr;
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struct multiboot1_mmap_entry *end = (struct multiboot1_mmap_entry *)(info->mmap_addr + info->mmap_length);
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e9_printf("\t usable_entries_mmap:");
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size_t total_mem = 0;
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// For now we only print the usable memory map entries since
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// printing the whole memory map blows my terminal up. We also
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// iterate through the avaliable memory map entries and add up
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// to find the total amount of usable memory.
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for (struct multiboot1_mmap_entry* entry = start; entry < end; entry++) {
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// Check if the memory map entry is marked as usable!
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if (entry->type != 1) {
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continue;
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}
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e9_printf("\t\t addr=%x", entry->addr);
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e9_printf("\t\t length=%x", entry->len);
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e9_printf("\t\t type=Usable");
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// Now this might be a bit confusing since but `entry->size` represents the
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// is the size of the associated structure in bytes and `entry->len` represents the
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// size of the memory region.
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total_mem += entry->len;
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}
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e9_printf("Total usable memory: %x", total_mem);
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}
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// TODO(Andy-Python-Programmer): Drives are unimplemented
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// TODO(Andy-Python-Programmer): ROM config is unimplemented
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e9_printf("\t bootloader_name: %s", info->bootloader_name);
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// TODO(Andy-Python-Programmer): APM table is unimplemented
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// TODO(Andy-Python-Programmer): VBE tag is unimplemented
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e9_printf("\t fb_addr: %x", info->fb_addr);
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e9_printf("\t fb_pitch: %x", info->fb_pitch);
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e9_printf("\t fb_width: %x", info->fb_width);
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e9_printf("\t fb_height: %x", info->fb_height);
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e9_printf("\t fb_bpp: %x", info->fb_bpp);
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e9_printf("\t fb_type: %x", info->fb_type);
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e9_printf("\t fb_red_mask_shift: %x", info->fb_red_mask_shift);
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e9_printf("\t fb_red_mask_size: %x", info->fb_red_mask_size);
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e9_printf("\t fb_green_mask_shift: %x", info->fb_green_mask_shift);
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e9_printf("\t fb_green_mask_size: %x", info->fb_green_mask_size);
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e9_printf("\t fb_blue_mask_shift: %x", info->fb_blue_mask_shift);
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e9_printf("\t fb_blue_mask_size: %x", info->fb_blue_mask_size);
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out:
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for (;;);
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}
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