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-rw-r--r--kalloc.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kalloc.c b/kalloc.c
index 5f690f5..72ce58a 100644
--- a/kalloc.c
+++ b/kalloc.c
@@ -17,12 +17,12 @@ struct {
struct run *freelist;
} kmem;
+extern char end[]; // first address after kernel loaded from ELF file
+
// Initialize free list of physical pages.
void
kinit(void)
{
- extern char end[];
-
initlock(&kmem.lock, "kmem");
char *p = (char*)PGROUNDUP((uint)end);
for( ; p + PGSIZE - 1 < (char*) PHYSTOP; p += PGSIZE)
@@ -39,7 +39,7 @@ kfree(char *v)
{
struct run *r;
- if(((uint) v) % PGSIZE || (uint)v < 1024*1024 || (uint)v >= PHYSTOP)
+ if(((uint) v) % PGSIZE || v < end || (uint)v >= PHYSTOP)
panic("kfree");
// Fill with junk to catch dangling refs.