fix corner cases in exec of ELF

put an invalid page below the stack
have fork() handle invalid pages

1 files changed, 0 insertions, 1 deletions

diff --git a/mmu.h b/mmu.h
index 76a6f1b..f4fc732 100644
--- a/mmu.h
+++ b/mmu.h
@@ -129,7 +129,6 @@ struct segdesc {
 #define PTE_ADDR(pte)	((uint) (pte) & ~0xFFF)
 
 typedef uint pte_t;
-extern pde_t    *kpgdir;
 
 // Control Register flags
 #define CR0_PE		0x00000001	// Protection Enable