It is accomplished ...

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
2002-07-09 12:24:59 +00:00
commit 52a3801208
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+/*
+** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
+** Distributed under the terms of the NewOS License.
+*/
+#ifndef _NEWOS_KERNEL_ARCH_SH4_KERNEL_H
+#define _NEWOS_KERNEL_ARCH_SH4_KERNEL_H
+
+#include <arch/sh4/sh4.h>
+
+// memory layout
+#define KERNEL_BASE P3_AREA
+#define KERNEL_SIZE P3_AREA_LEN
+#define KERNEL_TOP  (KERNEL_BASE + (KERNEL_SIZE - 1))
+
+/*
+** User space layout is a little special:
+** The user space does not completely cover the space not covered by the kernel.
+** This is accomplished by starting user space at 1Mb and running to 64kb short of kernel space.
+** The lower 1Mb reserved spot makes it easy to find null pointer references and guarantees a
+** region wont be placed there. The 64kb region assures a user space thread cannot pass
+** a buffer into the kernel as part of a syscall that would cross into kernel space.
+*/
+#define USER_BASE   (U0_AREA + 0x100000)
+#define USER_SIZE   (U0_AREA_LEN - (0x10000 + 0x100000))
+#define USER_TOP    (USER_BASE + USER_SIZE)
+
+#define USER_STACK_REGION (USER_BASE + USER_SIZE - USER_STACK_REGION_SIZE)
+#define USER_STACK_REGION_SIZE 0x10000000
+
+#endif