1/* mem-layout.h: memory layout 2 * 3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#ifndef _ASM_MEM_LAYOUT_H 13#define _ASM_MEM_LAYOUT_H 14 15#ifndef __ASSEMBLY__ 16#define __UL(X) ((unsigned long) (X)) 17#else 18#define __UL(X) (X) 19#endif 20 21/* 22 * PAGE_SHIFT determines the page size 23 */ 24#define PAGE_SHIFT 14 25 26#ifndef __ASSEMBLY__ 27#define PAGE_SIZE (1UL << PAGE_SHIFT) 28#else 29#define PAGE_SIZE (1 << PAGE_SHIFT) 30#endif 31 32#define PAGE_MASK (~(PAGE_SIZE-1)) 33 34/*****************************************************************************/ 35/* 36 * virtual memory layout from kernel's point of view 37 */ 38#define PAGE_OFFSET ((unsigned long) &__page_offset) 39 40#ifdef CONFIG_MMU 41 42/* see Documentation/fujitsu/frv/mmu-layout.txt */ 43#define KERNEL_LOWMEM_START __UL(0xc0000000) 44#define KERNEL_LOWMEM_END __UL(0xd0000000) 45#define VMALLOC_START __UL(0xd0000000) 46#define VMALLOC_END __UL(0xd8000000) 47#define PKMAP_BASE __UL(0xd8000000) 48#define PKMAP_END __UL(0xdc000000) 49#define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000) 50#define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000) 51 52#endif 53 54#define KERNEL_IO_START __UL(0xe0000000) 55 56 57/*****************************************************************************/ 58/* 59 * memory layout from userspace's point of view 60 */ 61#define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE) 62#define STACK_TOP __UL(2 * 1024 * 1024) 63 64/* userspace process size */ 65#ifdef CONFIG_MMU 66#define TASK_SIZE (PAGE_OFFSET) 67#else 68#define TASK_SIZE __UL(0xFFFFFFFFUL) 69#endif 70 71/* base of area at which unspecified mmaps will start */ 72#ifdef CONFIG_BINFMT_ELF_FDPIC 73#define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024) 74#else 75#define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3) 76#endif 77 78#endif /* _ASM_MEM_LAYOUT_H */ 79