You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
3.3 KiB
123 lines
3.3 KiB
20 years ago
|
/*
|
||
|
|
* arch/sh/mm/pg-sh4.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
||
|
|
* Copyright (C) 2002 Paul Mundt
|
||
|
|
*
|
||
|
|
* Released under the terms of the GNU GPL v2.0.
|
||
|
|
*/
|
||
|
|
#include <linux/config.h>
|
||
|
|
#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>
|
||
|
|
|
||
|
|
extern struct semaphore p3map_sem[];
|
||
|
|
|
||
|
|
/*
|
||
|
|
* clear_user_page
|
||
|
|
* @to: P1 address
|
||
|
|
* @address: U0 address to be mapped
|
||
|
|
* @page: page (virt_to_page(to))
|
||
|
|
*/
|
||
|
|
void clear_user_page(void *to, unsigned long address, struct page *page)
|
||
|
|
{
|
||
|
|
__set_bit(PG_mapped, &page->flags);
|
||
|
|
if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
|
||
|
|
clear_page(to);
|
||
|
|
else {
|
||
|
|
pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
|
||
|
|
_PAGE_RW | _PAGE_CACHABLE |
|
||
|
|
_PAGE_DIRTY | _PAGE_ACCESSED |
|
||
|
|
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
|
||
|
|
unsigned long phys_addr = PHYSADDR(to);
|
||
|
|
unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
|
||
|
|
pgd_t *dir = pgd_offset_k(p3_addr);
|
||
|
|
pmd_t *pmd = pmd_offset(dir, p3_addr);
|
||
|
|
pte_t *pte = pte_offset_kernel(pmd, p3_addr);
|
||
|
|
pte_t entry;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot);
|
||
|
|
down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
|
||
|
|
set_pte(pte, entry);
|
||
|
|
local_irq_save(flags);
|
||
|
|
__flush_tlb_page(get_asid(), p3_addr);
|
||
|
|
local_irq_restore(flags);
|
||
|
|
update_mmu_cache(NULL, p3_addr, entry);
|
||
|
|
__clear_user_page((void *)p3_addr, to);
|
||
|
|
pte_clear(&init_mm, p3_addr, pte);
|
||
|
|
up(&p3map_sem[(address & CACHE_ALIAS)>>12]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* copy_user_page
|
||
|
|
* @to: P1 address
|
||
|
|
* @from: P1 address
|
||
|
|
* @address: U0 address to be mapped
|
||
|
|
* @page: page (virt_to_page(to))
|
||
|
|
*/
|
||
|
|
void copy_user_page(void *to, void *from, unsigned long address,
|
||
|
|
struct page *page)
|
||
|
|
{
|
||
|
|
__set_bit(PG_mapped, &page->flags);
|
||
|
|
if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
|
||
|
|
copy_page(to, from);
|
||
|
|
else {
|
||
|
|
pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
|
||
|
|
_PAGE_RW | _PAGE_CACHABLE |
|
||
|
|
_PAGE_DIRTY | _PAGE_ACCESSED |
|
||
|
|
_PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
|
||
|
|
unsigned long phys_addr = PHYSADDR(to);
|
||
|
|
unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
|
||
|
|
pgd_t *dir = pgd_offset_k(p3_addr);
|
||
|
|
pmd_t *pmd = pmd_offset(dir, p3_addr);
|
||
|
|
pte_t *pte = pte_offset_kernel(pmd, p3_addr);
|
||
|
|
pte_t entry;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot);
|
||
|
|
down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
|
||
|
|
set_pte(pte, entry);
|
||
|
|
local_irq_save(flags);
|
||
|
|
__flush_tlb_page(get_asid(), p3_addr);
|
||
|
|
local_irq_restore(flags);
|
||
|
|
update_mmu_cache(NULL, p3_addr, entry);
|
||
|
|
__copy_user_page((void *)p3_addr, from, to);
|
||
|
|
pte_clear(&init_mm, p3_addr, pte);
|
||
|
|
up(&p3map_sem[(address & CACHE_ALIAS)>>12]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For SH-4, we have our own implementation for ptep_get_and_clear
|
||
|
|
*/
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|