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 */ 78