cbbe2f68f6
This builds in the newly created cache.c (renamed from pg-mmu.c) for both MMU and NOMMU configurations. The kmap_coherent() stubs and alias information recorded by each CPU family takes care of doing the right thing while enabling the code to be commonly shared. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
|
|
* arch/sh/mm/pg-mmu.c
|
|
*
|
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
|
* Copyright (C) 2002 - 2009 Paul Mundt
|
|
*
|
|
* Released under the terms of the GNU GPL v2.0.
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/module.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
|
|
unsigned long vaddr, void *dst, const void *src,
|
|
unsigned long len)
|
|
{
|
|
if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
|
|
!test_bit(PG_dcache_dirty, &page->flags)) {
|
|
void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
|
|
memcpy(vto, src, len);
|
|
kunmap_coherent();
|
|
} else {
|
|
memcpy(dst, src, len);
|
|
if (boot_cpu_data.dcache.n_aliases)
|
|
set_bit(PG_dcache_dirty, &page->flags);
|
|
}
|
|
|
|
if (vma->vm_flags & VM_EXEC)
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page));
|
|
}
|
|
|
|
void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
|
|
unsigned long vaddr, void *dst, const void *src,
|
|
unsigned long len)
|
|
{
|
|
if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
|
|
!test_bit(PG_dcache_dirty, &page->flags)) {
|
|
void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
|
|
memcpy(dst, vfrom, len);
|
|
kunmap_coherent();
|
|
} else {
|
|
memcpy(dst, src, len);
|
|
if (boot_cpu_data.dcache.n_aliases)
|
|
set_bit(PG_dcache_dirty, &page->flags);
|
|
}
|
|
}
|
|
|
|
void copy_user_highpage(struct page *to, struct page *from,
|
|
unsigned long vaddr, struct vm_area_struct *vma)
|
|
{
|
|
void *vfrom, *vto;
|
|
|
|
vto = kmap_atomic(to, KM_USER1);
|
|
|
|
if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
|
|
!test_bit(PG_dcache_dirty, &from->flags)) {
|
|
vfrom = kmap_coherent(from, vaddr);
|
|
copy_page(vto, vfrom);
|
|
kunmap_coherent();
|
|
} else {
|
|
vfrom = kmap_atomic(from, KM_USER0);
|
|
copy_page(vto, vfrom);
|
|
kunmap_atomic(vfrom, KM_USER0);
|
|
}
|
|
|
|
if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
|
|
__flush_wback_region(vto, PAGE_SIZE);
|
|
|
|
kunmap_atomic(vto, KM_USER1);
|
|
/* Make sure this page is cleared on other CPU's too before using it */
|
|
smp_wmb();
|
|
}
|
|
EXPORT_SYMBOL(copy_user_highpage);
|
|
|
|
void clear_user_highpage(struct page *page, unsigned long vaddr)
|
|
{
|
|
void *kaddr = kmap_atomic(page, KM_USER0);
|
|
|
|
clear_page(kaddr);
|
|
|
|
if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
|
|
__flush_wback_region(kaddr, PAGE_SIZE);
|
|
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
EXPORT_SYMBOL(clear_user_highpage);
|
|
|
|
void __update_cache(struct vm_area_struct *vma,
|
|
unsigned long address, pte_t pte)
|
|
{
|
|
struct page *page;
|
|
unsigned long pfn = pte_pfn(pte);
|
|
|
|
if (!boot_cpu_data.dcache.n_aliases)
|
|
return;
|
|
|
|
page = pfn_to_page(pfn);
|
|
if (pfn_valid(pfn) && page_mapping(page)) {
|
|
int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
|
|
if (dirty) {
|
|
unsigned long addr = (unsigned long)page_address(page);
|
|
|
|
if (pages_do_alias(addr, address & PAGE_MASK))
|
|
__flush_wback_region((void *)addr, PAGE_SIZE);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __flush_anon_page(struct page *page, unsigned long vmaddr)
|
|
{
|
|
unsigned long addr = (unsigned long) page_address(page);
|
|
|
|
if (pages_do_alias(addr, vmaddr)) {
|
|
if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
|
|
!test_bit(PG_dcache_dirty, &page->flags)) {
|
|
void *kaddr;
|
|
|
|
kaddr = kmap_coherent(page, vmaddr);
|
|
__flush_wback_region((void *)kaddr, PAGE_SIZE);
|
|
kunmap_coherent();
|
|
} else
|
|
__flush_wback_region((void *)addr, PAGE_SIZE);
|
|
}
|
|
}
|