Imbus/xv6-riscv-kernel
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This commit is contained in:
Robert Morris 2010-09-19 07:18:42 -04:00
parent faad047ab2
commit 4587b35847
2 changed files with 9 additions and 3 deletions
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6
kalloc.c
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@ -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.