87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/* 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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* the slab must be aligned such that load- and store-double instructions don't
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* fault if used
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*/
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#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
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#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
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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/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 __UL(0xc0000000)
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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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