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/*
* arch/ubicom32/include/asm/pgtable.h
* Ubicom32 pseudo page table definitions and operations.
*
* (C) Copyright 2009, Ubicom, Inc.
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
* and various works, Alpha, ix86, M68K, Sparc, ...et al
*/
#ifndef _ASM_UBICOM32_PGTABLE_H
#define _ASM_UBICOM32_PGTABLE_H
#include <asm-generic/4level-fixup.h>
//vic - this bit copied from m68knommu version
#include <asm/setup.h>
#include <asm/io.h>
#include <linux/sched.h>
typedef pte_t *pte_addr_t;
#define pgd_present(pgd) (1) /* pages are always present on NO_MM */
#define pgd_none(pgd) (0)
#define pgd_bad(pgd) (0)
#define pgd_clear(pgdp)
#define kern_addr_valid(addr) (1)
#define pmd_offset(a, b) ((void *)0)
#define PAGE_NONE __pgprot(0) /* these mean nothing to NO_MM */
#define PAGE_SHARED __pgprot(0) /* these mean nothing to NO_MM */
#define PAGE_COPY __pgprot(0) /* these mean nothing to NO_MM */
#define PAGE_READONLY __pgprot(0) /* these mean nothing to NO_MM */
#define PAGE_KERNEL __pgprot(0) /* these mean nothing to NO_MM */
//vic - this bit copied from m68knommu version
extern void paging_init(void);
#define swapper_pg_dir ((pgd_t *) 0)
#define __swp_type(x) (0)
#define __swp_offset(x) (0)
#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
/*
* pgprot_noncached() is only for infiniband pci support, and a real
* implementation for RAM would be more complicated.
*/
#define pgprot_noncached(prot) (prot)
static inline int pte_file(pte_t pte) { return 0; }
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
#define ZERO_PAGE(vaddr) (virt_to_page(0))
extern unsigned int kobjsize(const void *objp);
extern int is_in_rom(unsigned long);
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
extern inline void flush_cache_mm(struct mm_struct *mm)
{
}
extern inline void flush_cache_range(struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
}
/* Push the page at kernel virtual address and clear the icache */
extern inline void flush_page_to_ram (unsigned long address)
{
}
/* Push n pages at kernel virtual address and clear the icache */
extern inline void flush_pages_to_ram (unsigned long address, int n)
{
}
/*
* All 32bit addresses are effectively valid for vmalloc...
* Sort of meaningless for non-VM targets.
*/
#define VMALLOC_START 0
#define VMALLOC_END 0xffffffff
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
#include <asm-generic/pgtable.h>
#else
#define arch_enter_lazy_mmu_mode() do {} while (0)
#define arch_leave_lazy_mmu_mode() do {} while (0)
#define arch_flush_lazy_mmu_mode() do {} while (0)
#define arch_enter_lazy_cpu_mode() do {} while (0)
#define arch_leave_lazy_cpu_mode() do {} while (0)
#define arch_flush_lazy_cpu_mode() do {} while (0)
#endif
#endif /* _ASM_UBICOM32_PGTABLE_H */
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