From 8dc30322b84447cb6c38ba7c2ee0003d77716a68 Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Sun, 7 May 2006 15:48:02 +0000
Subject: Move the userland stack at the top of the userland address space.

---
 sys/arch/m88k/include/vmparam.h | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

(limited to 'sys/arch/m88k')

diff --git a/sys/arch/m88k/include/vmparam.h b/sys/arch/m88k/include/vmparam.h
index 8f19a0667c1..9f6b109066c 100644
--- a/sys/arch/m88k/include/vmparam.h
+++ b/sys/arch/m88k/include/vmparam.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vmparam.h,v 1.4 2005/12/01 22:24:49 miod Exp $ */
+/*	$OpenBSD: vmparam.h,v 1.5 2006/05/07 15:48:01 miod Exp $ */
 /*
  * Mach Operating System
  * Copyright (c) 1992 Carnegie Mellon University
@@ -38,7 +38,7 @@
  * is the top (end) of the user stack.
  */
 #define	USRTEXT		0x1000			/* Start of user text */
-#define	USRSTACK	0x80000000		/* Start of user stack */
+#define	USRSTACK	VM_MAXUSER_ADDRESS	/* Start of user stack */
 
 /*
  * Virtual memory related constants, all in bytes
@@ -68,16 +68,18 @@
 #define SHMMAXPGS	1024
 #endif
 
-#define	VM_MIN_ADDRESS		((vaddr_t) 0)
-#define	VM_MAX_ADDRESS		((vaddr_t) 0xffc00000)
+#define	VM_MIN_ADDRESS		((vaddr_t)0)
+#define	VM_MAX_ADDRESS		((vaddr_t)0xffc00000)
 #define VM_MAXUSER_ADDRESS	VM_MAX_ADDRESS
 
-/* on vme188, max = 0xf0000000 */
-
-#define VM_MIN_KERNEL_ADDRESS	((vaddr_t) 0)
-#define VM_MAX_KERNEL_ADDRESS	((vaddr_t) 0x20000000)
+/*
+ * Although user and supervisor address spaces are separate, we limit
+ * ourselves to 512KB KVM because the kernel page table is statically
+ * allocated.
+ */
+#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
+#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0x20000000)
 
-#define KERNEL_STACK_SIZE	(3 * PAGE_SIZE)	/* kernel stack size */
 #define INTSTACK_SIZE		(4 * PAGE_SIZE)	/* interrupt stack size */
 
 /* virtual sizes (bytes) for various kernel submaps */
-- 
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