139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
|
|
* 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 <linux/fs.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 = current_cpu_data.dcache.ways;
|
|
addr = CACHE_OC_ADDRESS_ARRAY;
|
|
|
|
do {
|
|
unsigned long data;
|
|
|
|
addr |= (v & current_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 += current_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
|
|
*/
|
|
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;
|
|
}
|
|
|