/* * arch/sh/mm/pg-sh7705.c * * Copyright (C) 1999, 2000  Niibe Yutaka * Copyright (C) 2004  Alex Song * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * */#include <linux/init.h>#include <linux/mman.h>#include <linux/mm.h>#include <linux/threads.h>#include <asm/addrspace.h>#include <asm/page.h>#include <asm/pgtable.h>#include <asm/processor.h>#include <asm/cache.h>#include <asm/io.h>#include <asm/uaccess.h>#include <asm/pgalloc.h>#include <asm/mmu_context.h>#include <asm/cacheflush.h>static inline void __flush_purge_virtual_region(void *p1, void *virt, int size){	unsigned long v;	unsigned long begin, end;	unsigned long p1_begin;	begin = L1_CACHE_ALIGN((unsigned long)virt);	end = L1_CACHE_ALIGN((unsigned long)virt + size);	p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1);	/* do this the slow way as we may not have TLB entries	 * for virt yet. */	for (v = begin; v < end; v += L1_CACHE_BYTES) {		unsigned long p;	        unsigned long ways, addr;		p = __pa(p1_begin);	        ways = cpu_data->dcache.ways;		addr = CACHE_OC_ADDRESS_ARRAY;		do {			unsigned long data;			addr |= (v & cpu_data->dcache.entry_mask);			data = ctrl_inl(addr);			if ((data & CACHE_PHYSADDR_MASK) ==			       (p & CACHE_PHYSADDR_MASK)) {				data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID);				ctrl_outl(data, addr);			}			addr += cpu_data->dcache.way_incr;		} while (--ways);		p1_begin += L1_CACHE_BYTES;	}}/* * clear_user_page * @to: P1 address * @address: U0 address to be mapped */void clear_user_page(void *to, unsigned long address, struct page *pg){	struct page *page = virt_to_page(to);	__set_bit(PG_mapped, &page->flags);	if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {		clear_page(to);		__flush_wback_region(to, PAGE_SIZE);	} else {		__flush_purge_virtual_region(to,					     (void *)(address & 0xfffff000),					     PAGE_SIZE);		clear_page(to);		__flush_wback_region(to, PAGE_SIZE);	}}/* * copy_user_page * @to: P1 address * @from: P1 address * @address: U0 address to be mapped */void copy_user_page(void *to, void *from, unsigned long address, struct page *pg){	struct page *page = virt_to_page(to);	__set_bit(PG_mapped, &page->flags);	if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {		copy_page(to, from);		__flush_wback_region(to, PAGE_SIZE);	} else {		__flush_purge_virtual_region(to,					     (void *)(address & 0xfffff000),					     PAGE_SIZE);		copy_page(to, from);		__flush_wback_region(to, PAGE_SIZE);	}}/* * For SH7705, we have our own implementation for ptep_get_and_clear * Copied from pg-sh4.c */inline pte_t ptep_get_and_clear(pte_t *ptep){	pte_t pte = *ptep;	pte_clear(ptep);	if (!pte_not_present(pte)) {		unsigned long pfn = pte_pfn(pte);		if (pfn_valid(pfn)) {			struct page *page = pfn_to_page(pfn);			struct address_space *mapping = page_mapping(page);			if (!mapping || !mapping_writably_mapped(mapping))				__clear_bit(PG_mapped, &page->flags);		}	}	return pte;}