130 строки
3.6 KiB
C
130 строки
3.6 KiB
C
/* Invalidate icache when dcache doesn't need invalidation as it's in
|
|
* write-through mode
|
|
*
|
|
* Copyright (C) 2010 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 <asm/cacheflush.h>
|
|
#include <asm/smp.h>
|
|
#include "cache-smp.h"
|
|
|
|
/**
|
|
* flush_icache_page_range - Flush dcache and invalidate icache for part of a
|
|
* single page
|
|
* @start: The starting virtual address of the page part.
|
|
* @end: The ending virtual address of the page part.
|
|
*
|
|
* Invalidate the icache for part of a single page, as determined by the
|
|
* virtual addresses given. The page must be in the paged area. The dcache is
|
|
* not flushed as the cache must be in write-through mode to get here.
|
|
*/
|
|
static void flush_icache_page_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long addr, size, off;
|
|
struct page *page;
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *ppte, pte;
|
|
|
|
/* work out how much of the page to flush */
|
|
off = start & ~PAGE_MASK;
|
|
size = end - start;
|
|
|
|
/* get the physical address the page is mapped to from the page
|
|
* tables */
|
|
pgd = pgd_offset(current->mm, start);
|
|
if (!pgd || !pgd_val(*pgd))
|
|
return;
|
|
|
|
pud = pud_offset(pgd, start);
|
|
if (!pud || !pud_val(*pud))
|
|
return;
|
|
|
|
pmd = pmd_offset(pud, start);
|
|
if (!pmd || !pmd_val(*pmd))
|
|
return;
|
|
|
|
ppte = pte_offset_map(pmd, start);
|
|
if (!ppte)
|
|
return;
|
|
pte = *ppte;
|
|
pte_unmap(ppte);
|
|
|
|
if (pte_none(pte))
|
|
return;
|
|
|
|
page = pte_page(pte);
|
|
if (!page)
|
|
return;
|
|
|
|
addr = page_to_phys(page);
|
|
|
|
/* invalidate the icache coverage on that region */
|
|
mn10300_local_icache_inv_range2(addr + off, size);
|
|
smp_cache_call(SMP_ICACHE_INV_RANGE, start, end);
|
|
}
|
|
|
|
/**
|
|
* flush_icache_range - Globally flush dcache and invalidate icache for region
|
|
* @start: The starting virtual address of the region.
|
|
* @end: The ending virtual address of the region.
|
|
*
|
|
* This is used by the kernel to globally flush some code it has just written
|
|
* from the dcache back to RAM and then to globally invalidate the icache over
|
|
* that region so that that code can be run on all CPUs in the system.
|
|
*/
|
|
void flush_icache_range(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long start_page, end_page;
|
|
unsigned long flags;
|
|
|
|
flags = smp_lock_cache();
|
|
|
|
if (end > 0x80000000UL) {
|
|
/* addresses above 0xa0000000 do not go through the cache */
|
|
if (end > 0xa0000000UL) {
|
|
end = 0xa0000000UL;
|
|
if (start >= end)
|
|
goto done;
|
|
}
|
|
|
|
/* kernel addresses between 0x80000000 and 0x9fffffff do not
|
|
* require page tables, so we just map such addresses
|
|
* directly */
|
|
start_page = (start >= 0x80000000UL) ? start : 0x80000000UL;
|
|
mn10300_icache_inv_range(start_page, end);
|
|
smp_cache_call(SMP_ICACHE_INV_RANGE, start, end);
|
|
if (start_page == start)
|
|
goto done;
|
|
end = start_page;
|
|
}
|
|
|
|
start_page = start & PAGE_MASK;
|
|
end_page = (end - 1) & PAGE_MASK;
|
|
|
|
if (start_page == end_page) {
|
|
/* the first and last bytes are on the same page */
|
|
flush_icache_page_range(start, end);
|
|
} else if (start_page + 1 == end_page) {
|
|
/* split over two virtually contiguous pages */
|
|
flush_icache_page_range(start, end_page);
|
|
flush_icache_page_range(end_page, end);
|
|
} else {
|
|
/* more than 2 pages; just flush the entire cache */
|
|
mn10300_local_icache_inv();
|
|
smp_cache_call(SMP_ICACHE_INV, 0, 0);
|
|
}
|
|
|
|
done:
|
|
smp_unlock_cache(flags);
|
|
}
|
|
EXPORT_SYMBOL(flush_icache_range);
|