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Got memory map almost working

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Tom-on
2025-03-19 11:25:45 +01:00
parent 883cd5c1d4
commit 05561cd857
6 changed files with 99 additions and 44 deletions
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kernel/src/bootloader.c
+38 -25
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@@ -2,46 +2,59 @@
#include <multiboot.h>
#include <kernel.h>
struct boot_info bootloader = { 0 };
struct boot_info bootloader;
// TODO:
int boot_init(int type, ...) {
va_list args;
va_start(args, type);
switch (type) {
case BOOT_UNKNOWN: return 1;
case BOOT_MB1: return boot_init_mb1(va_arg(args, void*), va_arg(args, uint32_t));
case BOOT_MB2: return 1;
case BOOT_LIMINE: return 1;
}
// We got an invalid boot protocol
return 1;
}
int boot_init_mb1(void* ptr, uint32_t magic) {
int boot_initMB1(void* ptr, uint32_t magic) {
multiboot_info_t* mbi = ptr;
if (magic != 0xBADB002) return 1;
if (magic != MULTIBOOT_BOOTLOADER_MAGIC) return 1;
// Memory info
// mem_* fields are valid
if (mbi->flags & MULTIBOOT_INFO_MEMORY) {
bootloader.memLower = mbi->mem_lower;
bootloader.memUpper = mbi->mem_upper;
}
// Memory map
if (mbi->flags & MULTIBOOT_INFO_MEM_MAP) {
uint32_t memmap = mbi->mmap_addr;
uint32_t offset = 0;
while (offset < mbi->mmap_length) {
multiboot_memory_map_t* entry = (multiboot_memory_map_t*)(memmap + offset);
offset += entry->size;
}
// boot_device is valid
if (mbi->flags & MULTIBOOT_INFO_BOOTDEV) {
bootloader.bootDrive = (mbi->boot_device & 0xff000000) >> 24;
bootloader.bootPart1 = (mbi->boot_device & 0x00ff0000) >> 16;
bootloader.bootPart2 = (mbi->boot_device & 0x0000ff00) >> 8;
bootloader.bootPart3 = (mbi->boot_device & 0x000000ff);
}
// cmdline is valid
if (mbi->flags & MULTIBOOT_INFO_CMDLINE) {
bootloader.cmdline = (char*)mbi->cmdline;
}
// TODO: mods
// TODO: a.out symbol table
// TODO: ELF symbol table
// mmap_* fields are valid
if (mbi->flags & MULTIBOOT_INFO_MEM_MAP) {
bootloader.memmap = mbi->mmap_addr;
bootloader.memmapLen = mbi->mmap_length;
}
// TODO: drives_*
// TODO: config_table
// boot_loader_name is valid
if (mbi->flags & MULTIBOOT_INFO_BOOT_LOADER_NAME) {
bootloader.bootname = (char*)mbi->boot_loader_name;
}
// TODO: APM table
// TODO: VBE table
// TODO: Framebuffer
return 0;
}