61 lines
No EOL
1.6 KiB
C
61 lines
No EOL
1.6 KiB
C
#include "page.h"
|
|
#include <limine.h>
|
|
#include "vmm.h"
|
|
#include <neobbo.h>
|
|
#include <stdatomic.h>
|
|
#include <kprint.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
struct page *pages; // "virtually sparse array", it holds all the pages between the start of the first usable address to the last one.
|
|
|
|
extern struct limine_memmap_response *memmap_response;
|
|
|
|
extern uint64_t hhdmoffset;
|
|
|
|
// Get the page object which is associated with the page that the address `addr` resides in
|
|
struct page *get_page(void *addr){
|
|
void *canonical_addr = (void*)PAGE_ROUND_DOWN((uint64_t)addr);
|
|
uint64_t phys_addr = kget_phys_addr(canonical_addr);
|
|
|
|
if(phys_addr == 0){
|
|
return NULL;
|
|
}
|
|
|
|
uint64_t index = phys_addr / PAGE_SIZE;
|
|
return &pages[index];
|
|
}
|
|
|
|
void init_page_array(){
|
|
|
|
struct limine_memmap_entry **entries = memmap_response->entries;
|
|
|
|
size_t firstaddr = 0;
|
|
size_t lastaddr = 0;
|
|
|
|
for(size_t i = 0; i < memmap_response->entry_count; i++){
|
|
switch(entries[i]->type){
|
|
case LIMINE_MEMMAP_USABLE:
|
|
if(firstaddr == 0){
|
|
firstaddr = entries[i]->base;
|
|
|
|
}else{
|
|
lastaddr = entries[i]->base + entries[i]->length;
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t page_count = (lastaddr - firstaddr) / PAGE_SIZE;
|
|
|
|
pages = va_alloc_contigious_pages((page_count * sizeof(struct page)) / PAGE_SIZE);
|
|
|
|
if(pages == NULL){
|
|
klog(__func__, "Couldn't allocate page structure");
|
|
kkill();
|
|
return;
|
|
}
|
|
|
|
memset(pages, 0, (page_count * sizeof(struct page)) / PAGE_SIZE);
|
|
|
|
} |