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 * the slab must be aligned such that load- and store-double instructions don't 36 * fault if used 37 */ 38 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES 39 #define ARCH_SLAB_MINALIGN L1_CACHE_BYTES 40 41 /*****************************************************************************/ 42 /* 43 * virtual memory layout from kernel's point of view 44 */ 45 #define PAGE_OFFSET ((unsigned long) &__page_offset) 46 47 #ifdef CONFIG_MMU 48 49 /* see Documentation/frv/mmu-layout.txt */ 50 #define KERNEL_LOWMEM_START __UL(0xc0000000) 51 #define KERNEL_LOWMEM_END __UL(0xd0000000) 52 #define VMALLOC_START __UL(0xd0000000) 53 #define VMALLOC_END __UL(0xd8000000) 54 #define PKMAP_BASE __UL(0xd8000000) 55 #define PKMAP_END __UL(0xdc000000) 56 #define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000) 57 #define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000) 58 59 #endif 60 61 #define KERNEL_IO_START __UL(0xe0000000) 62 63 64 /*****************************************************************************/ 65 /* 66 * memory layout from userspace's point of view 67 */ 68 #define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE) 69 #define STACK_TOP __UL(2 * 1024 * 1024) 70 #define STACK_TOP_MAX __UL(0xc0000000) 71 72 /* userspace process size */ 73 #ifdef CONFIG_MMU 74 #define TASK_SIZE (PAGE_OFFSET) 75 #else 76 #define TASK_SIZE __UL(0xFFFFFFFFUL) 77 #endif 78 79 /* base of area at which unspecified mmaps will start */ 80 #ifdef CONFIG_BINFMT_ELF_FDPIC 81 #define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024) 82 #else 83 #define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3) 84 #endif 85 86 #endif /* _ASM_MEM_LAYOUT_H */ 87