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#include <stddef.h>
#include <stdint.h>
#include <kernel/memory/paging.h>
#include <kernel/memory/alloc.h>
#include <kernel/system.h>
#include <kernel/lib/lib.h>
uint32_t placement_address;
struct heap_header *kheap = NULL;
struct heap_header *uheap = NULL;
void kheap_init()
{
placement_address = &ASM_KERNEL_END;
kheap = (struct heap_header *)fmalloc(KHEAP_SIZE);
init_heap(kheap, KHEAP_SIZE);
// Make user heap
uheap = (struct heap_header *)kmalloc_a(UHEAP_SIZE);
init_heap(uheap, UHEAP_SIZE);
paging_map_user(paging_root_directory, (uint32_t)&uheap, (uint32_t)&uheap);
}
void *fmalloc(uint32_t size)
{
//assert(placement_address + size < MEM_END);
uint32_t hold = placement_address;
memset((void *)hold, 0, size);
placement_address += size;
return (void *)hold;
}
void *kmalloc_a(uint32_t size)
{
//assert(((placement_address & 0xFFFFF000) + 0x1000) + size < MEM_END);
placement_address &= 0xFFFFF000;
placement_address += 0x1000;
uint32_t hold = placement_address;
placement_address += size;
return (void *)hold;
}
struct heap_header *find_sized_heap(struct heap_header *heap, size_t size)
{
while ((heap->size < HEAP_FIND_SIZE + size) || (heap->free != true)) {
assert(heap->magic == KHEAP_MAGIC);
assert(heap->magic2 == KHEAP_MAGIC2);
struct heap_footer *foot =
(struct heap_footer *)((uint32_t)heap + HEAP_S + heap->size);
assert(foot->magic == KHEAP_MAGIC);
assert(foot->magic2 == KHEAP_MAGIC2);
if (foot->size == KHEAP_END)
panic("Out of heap space");
if (foot->size != heap->size)
panic("Heap footer/header mismatch");
heap = (struct heap_header *)((uint32_t)foot + sizeof(struct heap_footer));
}
return heap;
}
void split_heap(struct heap_header *heap, size_t size)
{
struct heap_footer *foot = (struct heap_footer *)((uint32_t)heap + HEAP_S + size);
foot->magic = KHEAP_MAGIC;
foot->magic2 = KHEAP_MAGIC2;
foot->size = size;
size_t new_size = heap->size - HEAP_TOTAL - size;
heap->size = size;
heap = (struct heap_header *)((uint32_t)foot + sizeof(struct heap_footer));
heap->size = new_size;
heap->free = true;
heap->magic = KHEAP_MAGIC;
heap->magic2 = KHEAP_MAGIC2;
foot = (struct heap_footer *)((uint32_t)heap + HEAP_S + heap->size);
if ((foot->magic != KHEAP_MAGIC) || (foot->magic2 != KHEAP_MAGIC2)) {
warn("Invalid footer in split");
}
if (foot->size != KHEAP_END)
foot->size = new_size;
}
void free_internal(struct heap_header *heap, void *address)
{
struct heap_header *head = (struct heap_header *)((uint32_t)address - HEAP_S);
if (head == heap) {
warn("Can't collapse top of heap");
head->free = true;
return;
}
if ((head->magic != KHEAP_MAGIC) || (head->magic2 != KHEAP_MAGIC2)) {
//warn("Invalid header in heap");
return;
}
struct heap_footer *foot = (struct heap_footer *)((uint32_t)head + HEAP_S + head->size);
if ((foot->magic != KHEAP_MAGIC) || (foot->magic2 != KHEAP_MAGIC2))
panic("Bad heap call");
foot = (struct heap_footer *)((uint32_t)head - sizeof(struct heap_footer));
if ((foot->magic != KHEAP_MAGIC) || (foot->magic2 != KHEAP_MAGIC2)) {
//warn("Invalid footer in heap");
return;
}
if (foot->size == KHEAP_END)
panic("Impossible condition for heap");
heap = (struct heap_header *)((uint32_t)foot - foot->size - HEAP_S);
if ((heap->magic != KHEAP_MAGIC) || (heap->magic2 != KHEAP_MAGIC2)) {
warn("Invalid parent in heap");
return;
}
foot = (struct heap_footer *)((uint32_t)heap + (heap->size + head->size + HEAP_TOTAL) +
HEAP_S);
if ((foot->magic != KHEAP_MAGIC) || (foot->magic2 != KHEAP_MAGIC2)) {
/*vga_puts("Footer with size of ");
vga_puts_hex(foot->size);
vga_puts(" / head size of ");
vga_puts_hex(heap->size);
vga_puts("\n");
dump_struct(foot, sizeof(struct heap_footer));
warn("fatal arithmetic error in free() call");
*/
return;
}
heap->size += head->size + HEAP_TOTAL;
foot->size = heap->size;
}
void *malloc_internal(struct heap_header *heap, size_t size)
{
heap = find_sized_heap(heap, size + 8);
heap->free = false;
split_heap(heap, size);
return (void *)((uint32_t)heap + HEAP_S);
}
void init_heap(struct heap_header *heap, size_t size)
{
heap->magic = KHEAP_MAGIC;
heap->magic2 = KHEAP_MAGIC2;
heap->free = true;
heap->size = size - HEAP_TOTAL;
struct heap_footer *foot = (struct heap_footer *)((uint32_t)heap + HEAP_S + heap->size);
foot->magic = KHEAP_MAGIC;
foot->magic2 = KHEAP_MAGIC2;
foot->size = KHEAP_END;
}
void *kmalloc(uint32_t size)
{
if (kheap == NULL)
return fmalloc(size);
return malloc_internal(kheap, size);
}
void kfree(void *address)
{
if (kheap == NULL)
return;
free_internal(kheap, address);
}
void *umalloc(size_t size)
{
return malloc_internal(uheap, size);
}
void ufree(void *address)
{
free_internal(uheap, address);
}
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