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#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <printf.h>
#include <mm/kalloc.h>
extern uint64_t HEAP_START;
typedef struct freenode {
struct freenode *next;
} freenode_t;
freenode_t *head = NULL;
void *
kalloc(void)
{
freenode_t *p = head;
if (p == NULL)
return NULL;
head = p->next;
return p;
}
void *
kzalloc(void)
{
freenode_t *p = kalloc();
memset(p, 0, PAGE_SIZE);
return p;
}
void
kfree(void *p)
{
if (p == NULL)
return;
freenode_t *tmp = head;
head = p;
head->next = tmp;
}
void
kalloc_init(void)
{
freenode_t *p = (freenode_t*)HEAP_START;
for (;(unsigned long)p + PAGE_SIZE <= (HEAP_START + 0x100000); p += PAGE_SIZE) {
kfree(p);
}
}
void
walkfree(void)
{
freenode_t *node = head;
int nfree = 0;
while (node) {
printf("freenode at %p\n", node);
node = node->next;
nfree++;
}
printf("found and printed %d free pages!\n", nfree);
}
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