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* Tell the vm system that kerneltext is mapped readonly. Stolen from 

atari/atari/machdep.c.
This commit is contained in:
matthias 1996-11-07 07:18:23 +00:00
parent 8ea6b5f65c
commit f0d6340cba
1 changed files with 10 additions and 1 deletions
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11
sys/arch/pc532/pc532/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.51 1996/10/13 03:30:45 christos Exp $ */
/* $NetBSD: machdep.c,v 1.52 1996/11/07 07:18:23 matthias Exp $ */
/*-
* Copyright (c) 1996 Matthias Pfaller.
@ -148,6 +148,7 @@ void cpu_reset __P((void));
void
cpu_startup()
{
extern char etext[], kernel_text[];
unsigned i;
caddr_t v;
int sz;
@ -236,6 +237,14 @@ cpu_startup()
mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr,
VM_MBUF_SIZE, FALSE);
/*
* Tell the VM system that writing to kernel text isn't allowed.
* If we don't, we might end up COW'ing the text segment!
*/
if (vm_map_protect(kernel_map, NBPG, ns532_round_page(&kernel_text),
VM_PROT_READ|VM_PROT_EXECUTE, TRUE) != KERN_SUCCESS)
panic("can't protect kernel text");
/*
* Initialize callouts
*/