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authortsutsui <tsutsui@NetBSD.org>2021-08-06 05:22:21 +0000
committertsutsui <tsutsui@NetBSD.org>2021-08-06 05:22:21 +0000
commitb74b82cbd7bca010241aed1bdaa6cdf5fb3ac225 (patch)
tree2eb67eb12fd698f5deb631fec9050f7cee1fa7ef /sys
parent1a2f6b400b08611eb6797b9514a1fa4482fc425a (diff)
Add comments how mm_md_physacc() for hp300 works.
mm_md_physacc() for all other hp300 pmap based m68k ports that copied hp300 implemantation should have been fixed properly. XXX: no mm(9) man pages that describe MD implementation API definitions.
Diffstat (limited to 'sys')
-rw-r--r--sys/arch/hp300/hp300/machdep.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/arch/hp300/hp300/machdep.c b/sys/arch/hp300/hp300/machdep.c
index 10736ad36bb..88c548c0459 100644
--- a/sys/arch/hp300/hp300/machdep.c
+++ b/sys/arch/hp300/hp300/machdep.c
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.234 2020/06/11 19:20:43 ad Exp $ */
+/* $NetBSD: machdep.c,v 1.235 2021/08/06 05:22:21 tsutsui Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@@ -39,7 +39,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.234 2020/06/11 19:20:43 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.235 2021/08/06 05:22:21 tsutsui Exp $");
#include "opt_ddb.h"
#include "opt_compat_netbsd.h"
@@ -1164,6 +1164,10 @@ int
mm_md_physacc(paddr_t pa, vm_prot_t prot)
{
+ /*
+ * On the hp300, physical RAM is always located at the end of
+ * the physical address space, i.e. from 0xffffffff to lowram.
+ */
return (pa < lowram || pa >= 0xfffffffc) ? EFAULT : 0;
}