1 files changed, 89 insertions, 0 deletions
diff --git a/arch/frv/mm/highmem.c b/arch/frv/mm/highmem.c
new file mode 100644
index 000000000..bed9a9bd3
--- /dev/null
+++ b/arch/frv/mm/highmem.c
@@ -0,0 +1,89 @@
+/* highmem.c: arch-specific highmem stuff
+ *
+ * Copyright (C) 2004 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/highmem.h>
+#include <linux/module.h>
+
+void *kmap(struct page *page)
+{
+	might_sleep();
+	if (!PageHighMem(page))
+		return page_address(page);
+	return kmap_high(page);
+}
+
+EXPORT_SYMBOL(kmap);
+
+void kunmap(struct page *page)
+{
+	if (in_interrupt())
+		BUG();
+	if (!PageHighMem(page))
+		return;
+	kunmap_high(page);
+}
+
+EXPORT_SYMBOL(kunmap);
+
+struct page *kmap_atomic_to_page(void *ptr)
+{
+	return virt_to_page(ptr);
+}
+
+void *kmap_atomic(struct page *page)
+{
+	unsigned long paddr;
+	int type;
+
+	pagefault_disable();
+	type = kmap_atomic_idx_push();
+	paddr = page_to_phys(page);
+
+	switch (type) {
+	/*
+	 * The first 4 primary maps are reserved for architecture code
+	 */
+	case 0:		return __kmap_atomic_primary(0, paddr, 6);
+	case 1:		return __kmap_atomic_primary(0, paddr, 7);
+	case 2:		return __kmap_atomic_primary(0, paddr, 8);
+	case 3:		return __kmap_atomic_primary(0, paddr, 9);
+	case 4:		return __kmap_atomic_primary(0, paddr, 10);
+
+	case 5 ... 5 + NR_TLB_LINES - 1:
+		return __kmap_atomic_secondary(type - 5, paddr);
+
+	default:
+		BUG();
+		return NULL;
+	}
+}
+EXPORT_SYMBOL(kmap_atomic);
+
+void __kunmap_atomic(void *kvaddr)
+{
+	int type = kmap_atomic_idx();
+	switch (type) {
+	case 0:		__kunmap_atomic_primary(0, 6);	break;
+	case 1:		__kunmap_atomic_primary(0, 7);	break;
+	case 2:		__kunmap_atomic_primary(0, 8);	break;
+	case 3:		__kunmap_atomic_primary(0, 9);	break;
+	case 4:		__kunmap_atomic_primary(0, 10);	break;
+
+	case 5 ... 5 + NR_TLB_LINES - 1:
+		__kunmap_atomic_secondary(type - 5, kvaddr);
+		break;
+
+	default:
+		BUG();
+	}
+	kmap_atomic_idx_pop();
+	pagefault_enable();
+}
+EXPORT_SYMBOL(__kunmap_atomic);