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