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 43 typedef pte_t *pte_addr_t; 44 45 /* 46 * ZERO_PAGE is a global shared page that is always zero: used 47 * for zero-mapped memory areas etc.. 48 */ 49 #define ZERO_PAGE(vaddr) (virt_to_page(0)) 50 51 /* 52 * Mark the prot value as uncacheable and unbufferable. 53 */ 54 #define pgprot_noncached(prot) (prot) 55 #define pgprot_writecombine(prot) (prot) 56 #define pgprot_device(prot) (prot) 57 58 59 /* 60 * These would be in other places but having them here reduces the diffs. 61 */ 62 extern unsigned int kobjsize(const void *objp); 63 64 /* 65 * All 32bit addresses are effectively valid for vmalloc... 66 * Sort of meaningless for non-VM targets. 67 */ 68 #define VMALLOC_START 0UL 69 #define VMALLOC_END 0xffffffffUL 70 71 #define FIRST_USER_ADDRESS 0UL 72 73 #else 74 75 /* 76 * dummy tlb and user structures. 77 */ 78 #define v3_tlb_fns (0) 79 #define v4_tlb_fns (0) 80 #define v4wb_tlb_fns (0) 81 #define v4wbi_tlb_fns (0) 82 #define v6wbi_tlb_fns (0) 83 #define v7wbi_tlb_fns (0) 84 85 #define v3_user_fns (0) 86 #define v4_user_fns (0) 87 #define v4_mc_user_fns (0) 88 #define v4wb_user_fns (0) 89 #define v4wt_user_fns (0) 90 #define v6_user_fns (0) 91 #define xscale_mc_user_fns (0) 92 93 #endif /*__ASSEMBLY__*/ 94 95 #endif /* _ASMARM_PGTABLE_H */ 96