1/* 2 * arch/arm/include/asm/pgtable-nommu.h 3 * 4 * Copyright (C) 1995-2002 Russell King 5 * Copyright (C) 2004 Hyok S. Choi 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11#ifndef _ASMARM_PGTABLE_NOMMU_H 12#define _ASMARM_PGTABLE_NOMMU_H 13 14#ifndef __ASSEMBLY__ 15 16#include <linux/slab.h> 17#include <asm/processor.h> 18#include <asm/page.h> 19 20/* 21 * Trivial page table functions. 22 */ 23#define pgd_present(pgd) (1) 24#define pgd_none(pgd) (0) 25#define pgd_bad(pgd) (0) 26#define pgd_clear(pgdp) 27#define kern_addr_valid(addr) (1) 28#define pmd_offset(a, b) ((void *)0) 29/* 30 * PMD_SHIFT determines the size of the area a second-level page table can map 31 * PGDIR_SHIFT determines what a third-level page table entry can map 32 */ 33#define PGDIR_SHIFT 21 34 35#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 36#define PGDIR_MASK (~(PGDIR_SIZE-1)) 37 38#define PAGE_NONE __pgprot(0) 39#define PAGE_SHARED __pgprot(0) 40#define PAGE_COPY __pgprot(0) 41#define PAGE_READONLY __pgprot(0) 42#define PAGE_KERNEL __pgprot(0) 43 44#define swapper_pg_dir ((pgd_t *) 0) 45 46#define __swp_type(x) (0) 47#define __swp_offset(x) (0) 48#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) }) 49#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 50#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 51 52 53typedef pte_t *pte_addr_t; 54 55static inline int pte_file(pte_t pte) { return 0; } 56 57/* 58 * ZERO_PAGE is a global shared page that is always zero: used 59 * for zero-mapped memory areas etc.. 60 */ 61#define ZERO_PAGE(vaddr) (virt_to_page(0)) 62 63/* 64 * Mark the prot value as uncacheable and unbufferable. 65 */ 66#define pgprot_noncached(prot) __pgprot(0) 67#define pgprot_writecombine(prot) __pgprot(0) 68#define pgprot_dmacoherent(prot) __pgprot(0) 69 70 71/* 72 * These would be in other places but having them here reduces the diffs. 73 */ 74extern unsigned int kobjsize(const void *objp); 75 76/* 77 * No page table caches to initialise. 78 */ 79#define pgtable_cache_init() do { } while (0) 80#define io_remap_page_range remap_page_range 81#define io_remap_pfn_range remap_pfn_range 82 83 84/* 85 * All 32bit addresses are effectively valid for vmalloc... 86 * Sort of meaningless for non-VM targets. 87 */ 88#define VMALLOC_START 0UL 89#define VMALLOC_END 0xffffffffUL 90 91#define FIRST_USER_ADDRESS (0) 92 93#include <asm-generic/pgtable.h> 94 95#else 96 97/* 98 * dummy tlb and user structures. 99 */ 100#define v3_tlb_fns (0) 101#define v4_tlb_fns (0) 102#define v4wb_tlb_fns (0) 103#define v4wbi_tlb_fns (0) 104#define v6wbi_tlb_fns (0) 105#define v7wbi_tlb_fns (0) 106 107#define v3_user_fns (0) 108#define v4_user_fns (0) 109#define v4_mc_user_fns (0) 110#define v4wb_user_fns (0) 111#define v4wt_user_fns (0) 112#define v6_user_fns (0) 113#define xscale_mc_user_fns (0) 114 115#endif /*__ASSEMBLY__*/ 116 117#endif /* _ASMARM_PGTABLE_H */ 118