Moved tasks/* into containers/posix

containers/posix/mm0/src/dev.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#include <l4/lib/list.h>
+#include <vm_area.h>
+#include <lib/malloc.h>
+
+/*
+ * This is yet unused, it is more of an anticipation
+ * of how mmaped devices would be mapped with a pager.
+ */
+struct mmap_device {
+	struct link page_list;	/* Dyn-allocated page list */
+	unsigned long pfn_start;	/* Physical pfn start */
+	unsigned long pfn_end;		/* Physical pfn end */
+};
+
+struct page *memdev_page_in(struct vm_object *vm_obj,
+			    unsigned long pfn_offset)
+{
+	struct vm_file *f = vm_object_to_file(vm_obj);
+	struct mmap_device *memdev = f->priv_data;
+	struct page *page;
+
+	/* Check if its within device boundary */
+	if (pfn_offset >= memdev->pfn_end - memdev->pfn_start)
+		return PTR_ERR(-1);
+
+	/* Simply return the page if found */
+	list_foreach_struct(page, &memdev->page_list, list)
+		if (page->offset == pfn_offset)
+			return page;
+
+	/* Otherwise allocate one of our own for that offset and return it */
+	page = kzalloc(sizeof(struct page));
+	link_init(&page->list);
+	spin_lock_init(&page->lock);
+	page->offset = pfn_offset;
+	page->owner = vm_obj;
+	list_insert(&page->list, &memdev->page_list);
+
+	return page;
+}
+
+/* All mmapable devices are handled by this */
+struct vm_pager memdev_pager = {
+	.ops = {
+		.page_in = memdev_page_in,
+	},
+};
+
+