#include <linux/mm.h>
#include <linux/bitops.h>
#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/init.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/uaccess.h>
#ifdef CONFIG_HAS_IOPORT
LIST_HEAD(trapped_io);
+EXPORT_SYMBOL_GPL(trapped_io);
#endif
#ifdef CONFIG_HAS_IOMEM
LIST_HEAD(trapped_mem);
+EXPORT_SYMBOL_GPL(trapped_mem);
#endif
static DEFINE_SPINLOCK(trapped_lock);
-int __init register_trapped_io(struct trapped_io *tiop)
+static int trapped_io_disable __read_mostly;
+
+static int __init trapped_io_setup(char *__unused)
+{
+ trapped_io_disable = 1;
+ return 1;
+}
+__setup("noiotrap", trapped_io_setup);
+
+int register_trapped_io(struct trapped_io *tiop)
{
struct resource *res;
unsigned long len = 0, flags = 0;
struct page *pages[TRAPPED_PAGES_MAX];
int k, n;
+ if (unlikely(trapped_io_disable))
+ return 0;
+
/* structure must be page aligned */
if ((unsigned long)tiop & (PAGE_SIZE - 1))
goto bad;
pr_warning("unable to install trapped io filter\n");
return -1;
}
+EXPORT_SYMBOL_GPL(register_trapped_io);
void __iomem *match_trapped_io_handler(struct list_head *list,
unsigned long offset,
spin_unlock_irq(&trapped_lock);
return NULL;
}
+EXPORT_SYMBOL_GPL(match_trapped_io_handler);
static struct trapped_io *lookup_tiop(unsigned long address)
{