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/*
* 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(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t pte = *ptep;
pte_clear(mm, addr, 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;
}
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