rulimine/test/multiboot2.c

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#include <e9print.h>
#include <stdint.h>
#include <multiboot2.h>
struct multiboot_info {
uint32_t size;
uint32_t reserved;
struct multiboot_tag *first;
};
void multiboot2_main(uint32_t magic, struct multiboot_info* mb_info_addr) {
if (magic != MULTIBOOT2_BOOTLOADER_MAGIC) {
e9_printf("multiboot2: Invalid magic: %x\n", magic);
goto out;
}
e9_printf("Welcome to the multiboot2 test kernel: ");
e9_printf("\t size=%d", mb_info_addr->size);
e9_printf("\t reserved=%d", mb_info_addr->reserved);
e9_print("\nTags:\n");
size_t add_size = 0;
// NOTE: We set i to 8 to skip size and reserved fields:
for (size_t i = 8; i < mb_info_addr->size; i += add_size) {
struct multiboot_tag *tag = (struct multiboot_tag *)((uint8_t *)mb_info_addr + i);
if (tag->type == MULTIBOOT_TAG_TYPE_END) {
break;
}
switch (tag->type) {
case MULTIBOOT_TAG_TYPE_CMDLINE: {
struct multiboot_tag_string *cmdline = (struct multiboot_tag_string *)tag;
e9_printf("\t cmdline:");
e9_printf("\t\t string=%s", cmdline->string);
break;
}
case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME: {
struct multiboot_tag_string *name = (struct multiboot_tag_string *)tag;
e9_printf("\t bootloader_name:");
e9_printf("\t\t string=%s", name->string);
break;
}
case MULTIBOOT_TAG_TYPE_ACPI_OLD: {
struct multiboot_tag_old_acpi *old_acpi = (struct multiboot_tag_old_acpi *)tag;
e9_printf("\t acpi_old:");
e9_printf("\t\t rsdp=%s", old_acpi->rsdp);
break;
}
case MULTIBOOT_TAG_TYPE_ACPI_NEW: {
struct multiboot_tag_new_acpi *new_acpi = (struct multiboot_tag_new_acpi *)tag;
e9_printf("\t acpi_new:");
e9_printf("\t\t rsdp=%s", new_acpi->rsdp);
break;
}
case MULTIBOOT_TAG_TYPE_MODULE: {
struct multiboot_tag_module *module = (struct multiboot_tag_module *)tag;
e9_printf("\t module:");
e9_printf("\t\t mod_start=%x", module->mod_start);
e9_printf("\t\t mod_end=%x", module->mod_end);
e9_printf("\t\t cmdline=%s", module->cmdline);
break;
}
case MULTIBOOT_TAG_TYPE_BASIC_MEMINFO: {
struct multiboot_tag_basic_meminfo *meminfo = (struct multiboot_tag_basic_meminfo *)tag;
e9_printf("\t basic_meminfo:");
e9_printf("\t\t mem_lower=%x", meminfo->mem_lower);
e9_printf("\t\t mem_upper=%x", meminfo->mem_upper);
break;
}
// unimplemented(Andy-Python-Programmer): MULTIBOOT_TAG_TYPE_BOOTDEV
case MULTIBOOT_TAG_TYPE_MMAP: {
struct multiboot_tag_mmap *mmap = (struct multiboot_tag_mmap *)tag;
e9_printf("\t mmap:");
e9_printf("\t\t entry_size=%d", mmap->entry_size);
e9_printf("\t\t entry_version=%d", mmap->entry_version);
e9_printf("\t\t entries:");
struct multiboot_mmap_entry *m = (struct multiboot_mmap_entry *)(mmap->entries);
size_t entry_count = mmap->size / sizeof(struct multiboot_mmap_entry);
e9_printf("\t\t entry count: %d", entry_count);
// For now we only print the usable memory map entries since
// printing the whole memory map blows my terminal up. We also
// iterate through the avaliable memory map entries and add up
// to find the total amount of usable memory.
for (size_t i = 0; i < entry_count; i++) {
e9_printf("\t\t\t addr=%x", m[i].addr);
e9_printf("\t\t\t len=%x", m[i].len);
e9_printf("\t\t\t type=%x", m[i].type);
}
break;
}
// unimplemented(Andy-Python-Programmer): MULTIBOOT_TAG_TYPE_VBE
case MULTIBOOT_TAG_TYPE_FRAMEBUFFER: {
struct multiboot_tag_framebuffer *fb = (struct multiboot_tag_framebuffer *)tag;
e9_printf("\t framebuffer:");
e9_printf("\t\t framebuffer_pitch: %d", fb->common.framebuffer_pitch);
e9_printf("\t\t framebuffer_width: %d", fb->common.framebuffer_width);
e9_printf("\t\t framebuffer_height: %d", fb->common.framebuffer_height);
e9_printf("\t\t framebuffer_bpp: %d", fb->common.framebuffer_bpp);
e9_printf("\t\t framebuffer_type: %d", fb->common.framebuffer_type);
e9_printf("\t\t framebuffer_address: %x", fb->common.framebuffer_addr);
switch (fb->common.framebuffer_type) {
case MULTIBOOT_FRAMEBUFFER_TYPE_RGB: {
e9_printf("\t\t framebuffer_red_field_position: %x", fb->framebuffer_red_field_position);
e9_printf("\t\t framebuffer_red_mask_size: %x", fb->framebuffer_red_mask_size);
e9_printf("\t\t framebuffer_green_field_position: %x", fb->framebuffer_green_field_position);
e9_printf("\t\t framebuffer_green_mask_size: %x", fb->framebuffer_green_mask_size);
e9_printf("\t\t framebuffer_blue_field_position: %x", fb->framebuffer_blue_field_position);
e9_printf("\t\t framebuffer_blue_mask_size: %x", fb->framebuffer_blue_mask_size);
break;
}
// Rest are unimplemented(Andy-Python-Programmer):
}
break;
}
case MULTIBOOT_TAG_TYPE_NETWORK: {
struct multiboot_tag_network *network = (struct multiboot_tag_network *)tag;
e9_printf("\t network tag exists");
break;
}
}
add_size = tag->size;
// Align the size to 8 bytes.
if ((add_size % 8) != 0)
add_size += (8 - add_size % 8);
}
out:
for (;;);
}