Rick Rongen
20ab9e1d6e
Added late gdt setup with initial tss Moved attributes to include root Reordered some imports
105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
//
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// Created by rick on 22-04-20.
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//
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#include <attributes.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <myke/libk/libk.h>
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#include <myke/mem/mem.h>
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#include <myke/mem/pmm.h>
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#define MEMMAP_ENTRIES 16
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#define MMAP_TYPE_UNDEFINED 0
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#define MMAP_TYPE_AVAILABLE 1
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#define MMAP_TYPE_RESERVED 2
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#define MMAP_TYPE_ACPI_RECLAIMABLE 3
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#define MMAP_TYPE_NVS 4
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#define MMAP_TYPE_BADRAM 5
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#define MMAP_TYPE_KERNEL 6
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#define MMAP_TYPE_PAGING 7
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typedef struct {
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uint32_t address;
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uint32_t length;
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uint32_t type;
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} att_packed mmap_entry;
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int last_memmap_entry = 0;
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mmap_entry memmap[MEMMAP_ENTRIES] = {
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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{0, 0, 0},
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};
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void use_mmap_entry(struct multiboot_mmap_entry *entry) {
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mmap_entry *mm_entry = &memmap[last_memmap_entry++];
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mm_entry->address = (void *) entry->addr;
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mm_entry->length = entry->len;
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mm_entry->type = entry->type;
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// check if the entry overlaps with the kernel address space
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if (kernel_start >= mm_entry->address && kernel_start <= mm_entry->address + mm_entry->length) {
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uint32_t page_after_kernel = kernel_end + PAGE_SIZE & ~(PAGE_SIZE - 1);
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uint32_t kernel_size_full_pages = page_after_kernel - mm_entry->address;
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// todo make this something proper
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struct multiboot_mmap_entry extra_entry;
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extra_entry.size = entry->size;
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extra_entry.type = entry->type;
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extra_entry.addr = page_after_kernel;
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extra_entry.len = entry->size - kernel_size_full_pages;
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use_mmap_entry(&extra_entry);
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mm_entry->length = kernel_size_full_pages;
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mm_entry->type = MMAP_TYPE_KERNEL;
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}
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}
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void mmap_init_multiboot(struct multiboot_mmap_entry *entries, uint32_t count) {
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for (uint32_t i = 0; i < count; ++i) {
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use_mmap_entry(&entries[i]);
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}
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// init page manager
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for (int i = 0; i < last_memmap_entry; ++i) {
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mmap_entry *entry = &memmap[i];
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if (entry->type != MMAP_TYPE_AVAILABLE) {
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continue;
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}
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if (entry->address < kernel_start) {
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continue; // skip for now
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}
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pmm_init((void *) entry->address, entry->length);
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entry->type = MMAP_TYPE_PAGING;
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}
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}
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void print_mmap_info() {
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printf("Kernel start: %8x\n"
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"Kernel end: %8x\n", kernel_start, kernel_end);
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for (int i = 0; i < 16; ++i) {
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if (memmap[i].type == 0) {
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break;
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}
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printf("Idx: %d\n"
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"Address: %8x\n"
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"Length: %8x\n"
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"Type: %d\n\n", i, memmap[i].address, memmap[i].length, memmap[i].type);
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}
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}
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