src/lib/malloc.c

#include <stdlib.h>
#include <console/console.h>

#if 0
#define MALLOCDBG(x)
#else
#define MALLOCDBG(x...) printk_spew(x)
#endif
extern unsigned char _heap, _eheap;
static void *free_mem_ptr = &_heap;		/* Start of heap */
static void *free_mem_end_ptr = &_eheap;	/* End of heap */


void malloc_mark(malloc_mark_t *place)
{
	*place = (malloc_mark_t)free_mem_ptr;
	printk_spew("malloc_mark %p\n", free_mem_ptr);
}

void malloc_release(malloc_mark_t *ptr)
{
	free_mem_ptr = (void *)*ptr;
	printk_spew("malloc_release %p\n", free_mem_ptr);
}

void *malloc(size_t size)
{
	void *p;

	MALLOCDBG("%s Enter, size %ld, free_mem_ptr %p\n", __func__, size, free_mem_ptr);
	if (size < 0)
		die("Error! malloc: Size < 0");
	if (free_mem_ptr <= 0)
		die("Error! malloc: Free_mem_ptr <= 0");

	free_mem_ptr = (void *)(((unsigned long)free_mem_ptr + 3) & ~3);	/* Align */

	p = (void *) free_mem_ptr;
	free_mem_ptr += size;

	if (free_mem_ptr >= free_mem_end_ptr)
		die("Error! malloc: free_mem_ptr >= free_mem_end_ptr");

	MALLOCDBG("malloc %p\n", p);

	return p;
}

void free(void *where)
{
	/* Don't care */
}