122 lines
3 KiB
C
122 lines
3 KiB
C
|
/* MN10300 Cache flushing routines
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
||
|
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public Licence
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the Licence, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/mman.h>
|
||
|
|
#include <linux/threads.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(mn10300_icache_inv);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_inv);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_inv_range);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_inv_range2);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_inv_page);
|
||
|
|
|
||
|
|
#ifdef CONFIG_MN10300_CACHE_WBACK
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_inv);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_range);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_range2);
|
||
|
|
EXPORT_SYMBOL(mn10300_dcache_flush_page);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* write a page back from the dcache and invalidate the icache so that we can
|
||
|
|
* run code from it that we've just written into it
|
||
|
|
*/
|
||
|
|
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
|
||
|
|
{
|
||
|
|
mn10300_dcache_flush_page(page_to_phys(page));
|
||
|
|
mn10300_icache_inv();
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flush_icache_page);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* write some code we've just written back from the dcache and invalidate the
|
||
|
|
* icache so that we can run that code
|
||
|
|
*/
|
||
|
|
void flush_icache_range(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
#ifdef CONFIG_MN10300_CACHE_WBACK
|
||
|
|
unsigned long addr, size, off;
|
||
|
|
struct page *page;
|
||
|
|
pgd_t *pgd;
|
||
|
|
pud_t *pud;
|
||
|
|
pmd_t *pmd;
|
||
|
|
pte_t *ppte, pte;
|
||
|
|
|
||
|
|
for (; start < end; start += size) {
|
||
|
|
/* work out how much of the page to flush */
|
||
|
|
off = start & (PAGE_SIZE - 1);
|
||
|
|
|
||
|
|
size = end - start;
|
||
|
|
if (size > PAGE_SIZE - off)
|
||
|
|
size = PAGE_SIZE - off;
|
||
|
|
|
||
|
|
/* get the physical address the page is mapped to from the page
|
||
|
|
* tables */
|
||
|
|
pgd = pgd_offset(current->mm, start);
|
||
|
|
if (!pgd || !pgd_val(*pgd))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
pud = pud_offset(pgd, start);
|
||
|
|
if (!pud || !pud_val(*pud))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
pmd = pmd_offset(pud, start);
|
||
|
|
if (!pmd || !pmd_val(*pmd))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
ppte = pte_offset_map(pmd, start);
|
||
|
|
if (!ppte)
|
||
|
|
continue;
|
||
|
|
pte = *ppte;
|
||
|
|
pte_unmap(ppte);
|
||
|
|
|
||
|
|
if (pte_none(pte))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
page = pte_page(pte);
|
||
|
|
if (!page)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
addr = page_to_phys(page);
|
||
|
|
|
||
|
|
/* flush the dcache and invalidate the icache coverage on that
|
||
|
|
* region */
|
||
|
|
mn10300_dcache_flush_range2(addr + off, size);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
mn10300_icache_inv();
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flush_icache_range);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* allow userspace to flush the instruction cache
|
||
|
|
*/
|
||
|
|
asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
if (end < start)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
flush_icache_range(start, end);
|
||
|
|
return 0;
|
||
|
|
}
|