root/arch/c6x/include/asm/pgtable.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Port on Texas Instruments TMS320C6x architecture
   4  *
   5  *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
   6  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   7  */
   8 #ifndef _ASM_C6X_PGTABLE_H
   9 #define _ASM_C6X_PGTABLE_H
  10 
  11 #include <asm-generic/4level-fixup.h>
  12 
  13 #include <asm/setup.h>
  14 #include <asm/page.h>
  15 
  16 /*
  17  * All 32bit addresses are effectively valid for vmalloc...
  18  * Sort of meaningless for non-VM targets.
  19  */
  20 #define VMALLOC_START   0
  21 #define VMALLOC_END     0xffffffff
  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 
  29 #define pmd_offset(a, b)        ((void *)0)
  30 #define pmd_none(x)             (!pmd_val(x))
  31 #define pmd_present(x)          (pmd_val(x))
  32 #define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  33 #define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  34 
  35 #define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  36 #define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  37 #define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  38 #define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  39 #define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  40 #define pgprot_noncached(prot)  (prot)
  41 
  42 extern void paging_init(void);
  43 
  44 #define __swp_type(x)           (0)
  45 #define __swp_offset(x)         (0)
  46 #define __swp_entry(typ, off)   ((swp_entry_t) { ((typ) | ((off) << 7)) })
  47 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  48 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  49 
  50 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  51 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  52 
  53 /*
  54  * ZERO_PAGE is a global shared page that is always zero: used
  55  * for zero-mapped memory areas etc..
  56  */
  57 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  58 extern unsigned long empty_zero_page;
  59 
  60 #define swapper_pg_dir ((pgd_t *) 0)
  61 
  62 /*
  63  * c6x is !MMU, so define the simpliest implementation
  64  */
  65 #define pgprot_writecombine pgprot_noncached
  66 
  67 #include <asm-generic/pgtable.h>
  68 
  69 #endif /* _ASM_C6X_PGTABLE_H */