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Added <errno.h> and made kernel use it

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Tom-on
2026-03-25 18:17:42 +01:00
parent 7a57999d05
commit 2f05396651
15 changed files with 189 additions and 135 deletions
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kernel/src/pmm.c
+13 -21
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@@ -3,6 +3,7 @@
#include <limine.h>
#include <paging.h>
#include <serial.h>
#include <errno.h>
#include <pmm.h>
@@ -10,7 +11,6 @@ uint64_t* pmm_head = NULL;
size_t pmm_total_mem = 0;
int pmm_init(void) {
debugf("[pmm] Physical memory map:\n"); // We're gonna use the loop to also print the memmap
for (size_t i = 0; i < bootloader.mm_entry_count; i++) {
struct limine_memmap_entry* entry = bootloader.mm_entries[i];
@@ -39,37 +39,29 @@ int pmm_init(void) {
}
debugf("[pmm] %d bytes of available memory.\n", pmm_total_mem);
if (pmm_total_mem == 0) return -ENOMEM;
return 0;
return SUCCESS;
}
void* pmm_alloc() {
if (pmm_head == NULL) {
debugf("[pmm] Could not allocate page, not enough memory.\n");
return NULL;
}
if (pmm_head == NULL) return ERR_PTR(-ENOMEM);
uint64_t* addr = pmm_head;
if ((uintptr_t)addr % PAGE_SIZE != 0) {
debugf("[pmm] Tried to allocate non-aligned page.\n");
// It may fix itself if a page gets freed
// panic("pmm_head corrupted.");
return NULL;
}
if ((uintptr_t)addr % PAGE_SIZE != 0) panic("pmm_head corrupted.");
pmm_head = (uint64_t*)(*addr);
return TO_PHYS(addr);
}
void pmm_free(void* page) {
if (page == NULL) {
debugf("[pmm] Tried to free NULL.\n");
return;
}
if ((uintptr_t)page % PAGE_SIZE != 0) {
debugf("[pmm] Tried to free non-aligned page.\n");
return;
}
int pmm_free(void* page) {
if (page == NULL || IS_ERR(page)) return -EFAULT;
if ((uintptr_t)page % PAGE_SIZE != 0) return -EALIGN;
uint64_t* addr = TO_VIRT(page);
*addr = (uint64_t)pmm_head;
pmm_head = addr;
return SUCCESS;
}