1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * arch/arm/include/asm/pgtable-nommu.h 4 * 5 * Copyright (C) 1995-2002 Russell King 6 * Copyright (C) 2004 Hyok S. Choi 7 */ 8#ifndef _ASMARM_PGTABLE_NOMMU_H 9#define _ASMARM_PGTABLE_NOMMU_H 10 11#ifndef __ASSEMBLY__ 12 13#include <linux/slab.h> 14#include <asm/processor.h> 15#include <asm/page.h> 16 17/* 18 * Trivial page table functions. 19 */ 20#define pgd_present(pgd) (1) 21#define pgd_none(pgd) (0) 22#define pgd_bad(pgd) (0) 23#define pgd_clear(pgdp) 24/* 25 * PMD_SHIFT determines the size of the area a second-level page table can map 26 * PGDIR_SHIFT determines what a third-level page table entry can map 27 */ 28#define PGDIR_SHIFT 21 29 30#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 31#define PGDIR_MASK (~(PGDIR_SIZE-1)) 32/* FIXME */ 33 34#define PAGE_NONE __pgprot(0) 35#define PAGE_SHARED __pgprot(0) 36#define PAGE_COPY __pgprot(0) 37#define PAGE_READONLY __pgprot(0) 38#define PAGE_KERNEL __pgprot(0) 39 40#define swapper_pg_dir ((pgd_t *) 0) 41 42 43typedef pte_t *pte_addr_t; 44 45/* 46 * Mark the prot value as uncacheable and unbufferable. 47 */ 48#define pgprot_noncached(prot) (prot) 49#define pgprot_writecombine(prot) (prot) 50#define pgprot_device(prot) (prot) 51 52 53/* 54 * These would be in other places but having them here reduces the diffs. 55 */ 56extern unsigned int kobjsize(const void *objp); 57 58/* 59 * All 32bit addresses are effectively valid for vmalloc... 60 * Sort of meaningless for non-VM targets. 61 */ 62#define VMALLOC_START 0UL 63#define VMALLOC_END 0xffffffffUL 64 65#define FIRST_USER_ADDRESS 0UL 66 67#else 68 69/* 70 * dummy tlb and user structures. 71 */ 72#define v3_tlb_fns (0) 73#define v4_tlb_fns (0) 74#define v4wb_tlb_fns (0) 75#define v4wbi_tlb_fns (0) 76#define v6wbi_tlb_fns (0) 77#define v7wbi_tlb_fns (0) 78 79#define v3_user_fns (0) 80#define v4_user_fns (0) 81#define v4_mc_user_fns (0) 82#define v4wb_user_fns (0) 83#define v4wt_user_fns (0) 84#define v6_user_fns (0) 85#define xscale_mc_user_fns (0) 86 87#endif /*__ASSEMBLY__*/ 88 89#endif /* _ASMARM_PGTABLE_H */ 90