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Linux/arch/arm/include/asm/pgtable-nommu.h

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  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 #define kern_addr_valid(addr)   (1)
 25 /* FIXME */
 26 /*
 27  * PMD_SHIFT determines the size of the area a second-level page table can map
 28  * PGDIR_SHIFT determines what a third-level page table entry can map
 29  */
 30 #define PGDIR_SHIFT             21
 31 
 32 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 33 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
 34 /* FIXME */
 35 
 36 #define PAGE_NONE       __pgprot(0)
 37 #define PAGE_SHARED     __pgprot(0)
 38 #define PAGE_COPY       __pgprot(0)
 39 #define PAGE_READONLY   __pgprot(0)
 40 #define PAGE_KERNEL     __pgprot(0)
 41 
 42 #define swapper_pg_dir ((pgd_t *) 0)
 43 
 44 
 45 typedef pte_t *pte_addr_t;
 46 
 47 /*
 48  * ZERO_PAGE is a global shared page that is always zero: used
 49  * for zero-mapped memory areas etc..
 50  */
 51 #define ZERO_PAGE(vaddr)        (virt_to_page(0))
 52 
 53 /*
 54  * Mark the prot value as uncacheable and unbufferable.
 55  */
 56 #define pgprot_noncached(prot)  (prot)
 57 #define pgprot_writecombine(prot) (prot)
 58 #define pgprot_device(prot)     (prot)
 59 
 60 
 61 /*
 62  * These would be in other places but having them here reduces the diffs.
 63  */
 64 extern unsigned int kobjsize(const void *objp);
 65 
 66 /*
 67  * All 32bit addresses are effectively valid for vmalloc...
 68  * Sort of meaningless for non-VM targets.
 69  */
 70 #define VMALLOC_START   0UL
 71 #define VMALLOC_END     0xffffffffUL
 72 
 73 #define FIRST_USER_ADDRESS      0UL
 74 
 75 #else 
 76 
 77 /*
 78  * dummy tlb and user structures.
 79  */
 80 #define v3_tlb_fns      (0)
 81 #define v4_tlb_fns      (0)
 82 #define v4wb_tlb_fns    (0)
 83 #define v4wbi_tlb_fns   (0)
 84 #define v6wbi_tlb_fns   (0)
 85 #define v7wbi_tlb_fns   (0)
 86 
 87 #define v3_user_fns     (0)
 88 #define v4_user_fns     (0)
 89 #define v4_mc_user_fns  (0)
 90 #define v4wb_user_fns   (0)
 91 #define v4wt_user_fns   (0)
 92 #define v6_user_fns     (0)
 93 #define xscale_mc_user_fns (0)
 94 
 95 #endif /*__ASSEMBLY__*/
 96 
 97 #endif /* _ASMARM_PGTABLE_H */
 98 

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