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#include <mm/pmm.h>
#include <kernel.h>
#include <stdio.h>
pmm_list_node* head;
pmm_list_node* tail;
void pmm_init(limine_memmap_response* memmap) {
for (size_t i = 0; i < memmap->entry_count; i++) {
if (memmap->entries[i]->type != LIMINE_MEMMAP_USABLE) {
continue;
}
// Puts a node into each page of usable physical memory
if (head != nullptr) {
head->next = (pmm_list_node*)(memmap->entries[i]->base + _hhdm_offset);
}
if (tail != nullptr) {
tail = (pmm_list_node*)(memmap->entries[i]->base + _hhdm_offset);
}
for (size_t j = 0; j < memmap->entries[i]->length; j += 0x1000) {
pmm_list_node* page = (pmm_list_node*)(memmap->entries[i]->base + j + _hhdm_offset);
//head->next = page;
page->next = page + 0x1000;
head = page;
//tail = page;
}
}
// sets head->next to first set page
for (size_t i = 0; i < memmap->entry_count; i++) {
if (memmap->entries[i] == LIMINE_MEMMAP_USABLE) {
head->next = tail;
// head = (pmm_list_node*)(memmap->entries[i]->base + _hhdm_offset);
//tail->next = head;
break;
}
}
printf("Initialized PMM\n");
}
void* palloc() {
pmm_list_node* node = head;
printf("Head: %lx\nNext: %lx\n", head, head->next);
head = head->next;
return node;
}
void pfree(void* page) {
pmm_list_node* node = (pmm_list_node*)page + _hhdm_offset;
node->next = head;
head = node;
}
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