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gets the memory map from GRUB

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This commit is contained in:
Nathan Singer
2025-06-09 17:44:50 -04:00
parent f1515ad7b5
commit 83b6a9eaf2
8 changed files with 352 additions and 7 deletions
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56
kernel/kmain.c
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@ -1,5 +1,6 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <kernel/_kernel.h>
#include <kernel/tty.h>
@ -12,13 +13,61 @@
#include <kernel/x86/pci.h>
#include "multiboot.h"
void kmain(void)
void verify_memmap(multiboot_info_t* mbd, uint32_t magic)
{
if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
panic("Invalid magic number!");
else
printf("%2\n", magic);
if (!(mbd->flags >> 6 & 0x1))
panic("Invalid memory map given by GRUB bootloader!");
#ifdef __TESTING__
puts("Printing available memory map...");
uint32_t i;
for (i = 0; i < mbd->mmap_length; i += sizeof(multiboot_memory_map_t)) {
multiboot_memory_map_t* mmmt = (multiboot_memory_map_t*) (mbd->mmap_addr + i);
printf("Start Addr: %4 | Length: %4 | Size: %2 | Type: ",
mmmt->addr, mmmt->len, mmmt->size);
switch (mmmt->type) {
case MULTIBOOT_MEMORY_AVAILABLE:
puts("Available");
break;
case MULTIBOOT_MEMORY_RESERVED:
puts("Reserved");
break;
case MULTIBOOT_MEMORY_ACPI_RECLAIMABLE:
puts("ACPI Reclaimable");
break;
case MULTIBOOT_MEMORY_NVS:
puts("NVS");
break;
case MULTIBOOT_MEMORY_BADRAM:
puts("Bad ram");
break;
default:
puts("Unknown");
break;
}
// if (mmmt->type == MULTIBOOT_MEMORY_AVAILABLE) -> DO SOMETHING
}
#endif
}
void _main(multiboot_info_t* mbd, uint32_t magic)
{
#ifdef __TESTING__ // important components should be declared first, but if we're testing we want to log all of that
terminal_initialize();
serial_initialize();
#endif
verify_memmap(mbd, magic);
gdt_init();
idt_init();
@ -26,14 +75,11 @@ void kmain(void)
terminal_initialize();
serial_initialize();
#endif
init_kb();
init_pit(0x36, PIT_CHANNEL_0, 0);
printf("%d\n", pci_config_read_word(0, 1, 1, 6));
printf("Entering loop...\n");
while (1) {