summaryrefslogtreecommitdiff
path: root/arch/i386/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/i386/kernel')
-rw-r--r--arch/i386/kernel/kmalloc.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/arch/i386/kernel/kmalloc.c b/arch/i386/kernel/kmalloc.c
index 8118ecd..9c82e39 100644
--- a/arch/i386/kernel/kmalloc.c
+++ b/arch/i386/kernel/kmalloc.c
@@ -2,27 +2,25 @@
#include <kernel/paging.h>
#include <kernel/pmem.h>
#include <kernel/asm.h>
+#include <kernel/vmem.h>
#include <kernel/panic.h>
#include <stdint.h>
static uintptr_t heap_start = KEND + 0xC0001000;
-static uintptr_t heap_end = 0xFFFFF000;
+static uintptr_t heap_end = 0xFFBFF000;
static void *kbrk = NULL;
static struct mem_block *first = NULL;
void _request_page(void) {
- uintptr_t paddr = pfa_alloc();
- if (paddr == PFA_ALLOC_ERR)
- panic("Out of physical memory");
-
+ uintptr_t paddr = pfa_alloc(1);
uintptr_t vaddr = PGROUNDDN((uintptr_t)kbrk + PAGE_SIZE);
kbrk += PAGE_SIZE;
- map_page(NULL, paddr, vaddr, PD_PRES | PD_RW);
+ map_page(paddr, vaddr, PD_PRES | PD_RW);
}
void kmalloc_init(void) {
- kbrk = (void*)(heap_start & 0xFFFFF000);
+ kbrk = PGROUNDDN(heap_start);
_request_page();
first = (struct mem_block*)kbrk;
first->start = (uintptr_t)kbrk + sizeof(struct mem_block);
@@ -39,12 +37,17 @@ void* kmalloc(size_t sz) {
struct mem_block *temp = first;
while (temp->next != NULL) {
- if (temp->size <= sz && temp->alloc == 0)
+ if (temp->size <= sz && temp->alloc == 0) {
+ temp->alloc = 1;
return (void*)temp->start;
+ }
temp = temp->next;
}
temp->next = (struct mem_block*)((uintptr_t)temp + sizeof(struct mem_block) + temp->size);
+ if (temp->next > kbrk)
+ _request_page();
+ temp->next->prev = temp;
temp = temp->next;
temp->start = (uintptr_t)(temp + sizeof(struct mem_block));
temp->size = sz;
@@ -55,11 +58,12 @@ void* kmalloc(size_t sz) {
void kfree(void *ptr) {
struct mem_block *temp = first;
- while (temp->next != NULL) {
+ while (temp != NULL) {
if (temp->start == (uintptr_t)ptr) {
temp->alloc = 0;
return;
}
+ temp = temp->next;
}
panic("Attempted to free memory not alloc'd");
}