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
45extern 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)
61extern 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 */