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 */