예제 #1
0
/**
 * 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_local_dcache_flush_range(start_page, end);
		mn10300_local_icache_inv_range(start_page, end);
		smp_cache_call(SMP_IDCACHE_INV_FLUSH_RANGE, start_page, 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_dcache_flush();
		mn10300_icache_inv();
		smp_cache_call(SMP_IDCACHE_INV_FLUSH, 0, 0);
	}

done:
	smp_unlock_cache(flags);
}
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) {
		/*                                                        */
		if (end > 0xa0000000UL) {
			end = 0xa0000000UL;
			if (start >= end)
				goto done;
		}

		/*                                                          
                                                       
              */
		start_page = (start >= 0x80000000UL) ? start : 0x80000000UL;
		mn10300_local_dcache_flush_range(start_page, end);
		mn10300_local_icache_inv_range(start_page, end);
		smp_cache_call(SMP_IDCACHE_INV_FLUSH_RANGE, start_page, 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) {
		/*                                               */
		flush_icache_page_range(start, end);
	} else if (start_page + 1 == end_page) {
		/*                                           */
		flush_icache_page_range(start, end_page);
		flush_icache_page_range(end_page, end);
	} else {
		/*                                                */
		mn10300_dcache_flush();
		mn10300_icache_inv();
		smp_cache_call(SMP_IDCACHE_INV_FLUSH, 0, 0);
	}

done:
	smp_unlock_cache(flags);
}