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 /* FIXME */ 30 /* 31 * PMD_SHIFT determines the size of the area a second-level page table can map 32 * PGDIR_SHIFT determines what a third-level page table entry can map 33 */ 34 #define PGDIR_SHIFT 21 35 36 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 37 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 38 /* FIXME */ 39 40 #define PAGE_NONE __pgprot(0) 41 #define PAGE_SHARED __pgprot(0) 42 #define PAGE_COPY __pgprot(0) 43 #define PAGE_READONLY __pgprot(0) 44 #define PAGE_KERNEL __pgprot(0) 45 46 #define swapper_pg_dir ((pgd_t *) 0) 47 48 #define __swp_type(x) (0) 49 #define __swp_offset(x) (0) 50 #define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) }) 51 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 52 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 53 54 55 typedef pte_t *pte_addr_t; 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 */ 74 extern 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 81 /* 82 * All 32bit addresses are effectively valid for vmalloc... 83 * Sort of meaningless for non-VM targets. 84 */ 85 #define VMALLOC_START 0UL 86 #define VMALLOC_END 0xffffffffUL 87 88 #define FIRST_USER_ADDRESS 0UL 89 90 #include <asm-generic/pgtable.h> 91 92 #else 93 94 /* 95 * dummy tlb and user structures. 96 */ 97 #define v3_tlb_fns (0) 98 #define v4_tlb_fns (0) 99 #define v4wb_tlb_fns (0) 100 #define v4wbi_tlb_fns (0) 101 #define v6wbi_tlb_fns (0) 102 #define v7wbi_tlb_fns (0) 103 104 #define v3_user_fns (0) 105 #define v4_user_fns (0) 106 #define v4_mc_user_fns (0) 107 #define v4wb_user_fns (0) 108 #define v4wt_user_fns (0) 109 #define v6_user_fns (0) 110 #define xscale_mc_user_fns (0) 111 112 #endif /*__ASSEMBLY__*/ 113 114 #endif /* _ASMARM_PGTABLE_H */ 115