LXR linux/arch/c6x/include/asm/pgtable.h

   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/pgtable-nopud.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_none(x)             (!pmd_val(x))
  30#define pmd_present(x)          (pmd_val(x))
  31#define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  32#define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  33
  34#define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  35#define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  36#define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  37#define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  38#define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  39#define pgprot_noncached(prot)  (prot)
  40
  41extern void paging_init(void);
  42
  43#define __swp_type(x)           (0)
  44#define __swp_offset(x)         (0)
  45#define __swp_entry(typ, off)   ((swp_entry_t) { ((typ) | ((off) << 7)) })
  46#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  47#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  48
  49#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  50#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  51
  52/*
  53 * ZERO_PAGE is a global shared page that is always zero: used
  54 * for zero-mapped memory areas etc..
  55 */
  56#define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  57extern unsigned long empty_zero_page;
  58
  59#define swapper_pg_dir ((pgd_t *) 0)
  60
  61/*
  62 * c6x is !MMU, so define the simpliest implementation
  63 */
  64#define pgprot_writecombine pgprot_noncached
  65
  66#endif /* _ASM_C6X_PGTABLE_H */
  67