arch/c6x/include/asm/pgtable.h

   1 /*
   2  *  Port on Texas Instruments TMS320C6x architecture
   3  *
   4  *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
   5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   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 _ASM_C6X_PGTABLE_H
  12 #define _ASM_C6X_PGTABLE_H
  13
  14 #include <asm-generic/4level-fixup.h>
  15
  16 #include <asm/setup.h>
  17 #include <asm/page.h>
  18
  19 /*
  20  * All 32bit addresses are effectively valid for vmalloc...
  21  * Sort of meaningless for non-VM targets.
  22  */
  23 #define VMALLOC_START   0
  24 #define VMALLOC_END     0xffffffff
  25
  26 #define pgd_present(pgd)        (1)
  27 #define pgd_none(pgd)           (0)
  28 #define pgd_bad(pgd)            (0)
  29 #define pgd_clear(pgdp)
  30 #define kern_addr_valid(addr) (1)
  31
  32 #define pmd_offset(a, b)        ((void *)0)
  33 #define pmd_none(x)             (!pmd_val(x))
  34 #define pmd_present(x)          (pmd_val(x))
  35 #define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  36 #define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  37
  38 #define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  39 #define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  40 #define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  41 #define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  42 #define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  43 #define pgprot_noncached(prot)  (prot)
  44
  45 extern void paging_init(void);
  46
  47 #define __swp_type(x)           (0)
  48 #define __swp_offset(x)         (0)
  49 #define __swp_entry(typ, off)   ((swp_entry_t) { ((typ) | ((off) << 7)) })
  50 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  51 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  52
  53 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  54 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  55
  56 /*
  57  * ZERO_PAGE is a global shared page that is always zero: used
  58  * for zero-mapped memory areas etc..
  59  */
  60 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  61 extern unsigned long empty_zero_page;
  62
  63 #define swapper_pg_dir ((pgd_t *) 0)
  64
  65 /*
  66  * No page table caches to initialise
  67  */
  68 #define pgtable_cache_init()   do { } while (0)
  69
  70 /*
  71  * c6x is !MMU, so define the simpliest implementation
  72  */
  73 #define pgprot_writecombine pgprot_noncached
  74
  75 #include <asm-generic/pgtable.h>
  76
  77 #endif /* _ASM_C6X_PGTABLE_H */