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/* mem-layout.h: memory layout
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _ASM_MEM_LAYOUT_H
#define _ASM_MEM_LAYOUT_H
#ifndef __ASSEMBLY__
#define __UL(X) ((unsigned long) (X))
#else
#define __UL(X) (X)
#endif
/*
* PAGE_SHIFT determines the page size
*/
#define PAGE_SHIFT 14
#ifndef __ASSEMBLY__
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#else
#define PAGE_SIZE (1 << PAGE_SHIFT)
#endif
#define PAGE_MASK (~(PAGE_SIZE-1))
/*****************************************************************************/
/*
* virtual memory layout from kernel's point of view
*/
#define PAGE_OFFSET ((unsigned long) &__page_offset)
#ifdef CONFIG_MMU
/* see Documentation/frv/mmu-layout.txt */
#define KERNEL_LOWMEM_START __UL(0xc0000000)
#define KERNEL_LOWMEM_END __UL(0xd0000000)
#define VMALLOC_START __UL(0xd0000000)
#define VMALLOC_END __UL(0xd8000000)
#define PKMAP_BASE __UL(0xd8000000)
#define PKMAP_END __UL(0xdc000000)
#define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000)
#define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000)
#endif
#define KERNEL_IO_START __UL(0xe0000000)
/*****************************************************************************/
/*
* memory layout from userspace's point of view
*/
#define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE)
#define STACK_TOP __UL(2 * 1024 * 1024)
#define STACK_TOP_MAX STACK_TOP
/* userspace process size */
#ifdef CONFIG_MMU
#define TASK_SIZE (PAGE_OFFSET)
#else
#define TASK_SIZE __UL(0xFFFFFFFFUL)
#endif
/* base of area at which unspecified mmaps will start */
#ifdef CONFIG_BINFMT_ELF_FDPIC
#define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024)
#else
#define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3)
#endif
#endif /* _ASM_MEM_LAYOUT_H */
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