b111757c50
New arch macro STACK_TOP_MAX it gives the larges valid stack address for the architecture in question. It differs from STACK_TOP in that it will not distinguish between personalities but will always return the largest possible address. This is used to create the initial stack on execve, which we will move down to the proper location once the binfmt code has figured out where that is. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ollie Wild <aaw@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2 KiB
C
79 lines
2 KiB
C
/* mem-layout.h: memory layout
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_MEM_LAYOUT_H
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#define _ASM_MEM_LAYOUT_H
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#ifndef __ASSEMBLY__
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#define __UL(X) ((unsigned long) (X))
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#else
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#define __UL(X) (X)
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#endif
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/*
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* PAGE_SHIFT determines the page size
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*/
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#define PAGE_SHIFT 14
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#ifndef __ASSEMBLY__
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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/*****************************************************************************/
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/*
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* virtual memory layout from kernel's point of view
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*/
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#define PAGE_OFFSET ((unsigned long) &__page_offset)
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#ifdef CONFIG_MMU
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/* see Documentation/fujitsu/frv/mmu-layout.txt */
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#define KERNEL_LOWMEM_START __UL(0xc0000000)
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#define KERNEL_LOWMEM_END __UL(0xd0000000)
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#define VMALLOC_START __UL(0xd0000000)
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#define VMALLOC_END __UL(0xd8000000)
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#define PKMAP_BASE __UL(0xd8000000)
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#define PKMAP_END __UL(0xdc000000)
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#define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000)
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#define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000)
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#endif
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#define KERNEL_IO_START __UL(0xe0000000)
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/*****************************************************************************/
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/*
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* memory layout from userspace's point of view
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*/
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#define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE)
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#define STACK_TOP __UL(2 * 1024 * 1024)
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#define STACK_TOP_MAX STACK_TOP
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/* userspace process size */
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#ifdef CONFIG_MMU
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#define TASK_SIZE (PAGE_OFFSET)
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#else
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#define TASK_SIZE __UL(0xFFFFFFFFUL)
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#endif
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/* base of area at which unspecified mmaps will start */
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#ifdef CONFIG_BINFMT_ELF_FDPIC
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#define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024)
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#else
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#define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3)
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#endif
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#endif /* _ASM_MEM_LAYOUT_H */
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