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

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  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 */
 78 

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