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Hi,

I've just noticed that VM_TOPDOWN isn't used on amd64.  Is it an
overlook or is there a compelling reason for it?

In any case, it seems to jsut work.  The patch I'm including also adds
code to make netbsd32 binaries use the topdown layout, and sync a few
VM parameters with their i386 counterparts.

I'd like to commit it unless someone objects.  Notice the huge available
VM space for netbsd32 binaries on an amd64 system:

% /mnt/netbsd32/bin/sh
$ /../usr/bin/pmap
0000000008048000    104K read/exec         /mnt/netbsd32 -?-
0000000008062000      4K read/write          [ anon ]
0000000008063000     24K read/write          [ anon ]
00000000FBEFF000      4K read/write          [ anon ]
00000000FBF00000    724K read/exec         /mnt/netbsd32 -?-
[...]

amd64 binaries look like this:

$ pmap
0000000000400000    116K read/exec         / -?-
000000000051C000     16K read/write        / -?-
0000000000520000     32K read/write          [ anon ]
00007F7FFD800000    800K read/exec         / -?-
00007F7FFD8C8000   1024K                   / -?-
00007F7FFD9C8000    116K read/write        / -?-
00007F7FFD9E5000     68K read/write          [ anon ]
[...]

--=20
Quentin Garnier - cube@cubidou.net - cube@NetBSD.org
"When I find the controls, I'll go where I like, I'll know where I want
to be, but maybe for now I'll stay right here on a silent sea."
KT Tunstall, Silent Sea, Eye to the Telescope, 2004.

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? conf/AAYLA
Index: amd64/netbsd32_machdep.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /cvsroot/src/sys/arch/amd64/amd64/netbsd32_machdep.c,v
retrieving revision 1.18
diff -u -r1.18 netbsd32_machdep.c
--- amd64/netbsd32_machdep.c	11 Dec 2005 12:16:21 -0000	1.18
+++ amd64/netbsd32_machdep.c	2 Jan 2006 13:52:47 -0000
@@ -873,5 +873,5 @@
 vaddr_t
 netbsd32_vm_default_addr(struct proc *p, vaddr_t base, vsize_t size)
 {
-	return round_page((vaddr_t)(base) + (vsize_t)MAXDSIZ32);
+	return VM_DEFAULT_ADDRESS32(base, size);
 }
Index: include/vmparam.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /cvsroot/src/sys/arch/amd64/include/vmparam.h,v
retrieving revision 1.10
diff -u -r1.10 vmparam.h
--- include/vmparam.h	11 Dec 2005 12:16:25 -0000	1.10
+++ include/vmparam.h	2 Jan 2006 13:52:48 -0000
@@ -89,13 +89,13 @@
 #define	DFLDSIZ32	(256*1024*1024)		/* initial data size limit */
 #endif
 #ifndef MAXDSIZ32
-#define	MAXDSIZ32	(2L*1024*1024*1024)	/* max data size */
+#define	MAXDSIZ32	(3U*1024*1024*1024)	/* max data size */
 #endif
 #ifndef	DFLSSIZ32
 #define	DFLSSIZ32	(2*1024*1024)		/* initial stack size limit */
 #endif
 #ifndef	MAXSSIZ32
-#define	MAXSSIZ32	(32*1024*1024)		/* max stack size */
+#define	MAXSSIZ32	(64*1024*1024)		/* max stack size */
 #endif
=20
 /*
@@ -124,6 +124,18 @@
 #define VM_MAXUSER_ADDRESS32	0xfffff000
=20
 /*
+ * The address to which unspecified mapping requests default
+ */
+#ifdef _KERNEL_OPT
+#include "opt_uvm.h"
+#endif
+#define __USE_TOPDOWN_VM
+#define VM_DEFAULT_ADDRESS(da, sz) \
+	trunc_page(USRSTACK - MAXSSIZ - (sz))
+#define VM_DEFAULT_ADDRESS32(da, sz) \
+	trunc_page(USRSTACK32 - MAXSSIZ32 - (sz))
+
+/*
  * XXXfvdl we have plenty of KVM now, remove this.
  */
 #ifndef VM_MAX_KERNEL_BUF

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