/**
* 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);
}