Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / xen / xenfs / xenstored.c

diff --git a/kernel/drivers/xen/xenfs/xenstored.c b/kernel/drivers/xen/xenfs/xenstored.c
new file mode 100644 (file)
index 0000000..fef20db
--- /dev/null
+++ b/kernel/drivers/xen/xenfs/xenstored.c
@@ -0,0 +1,68 @@
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+
+#include <xen/page.h>
+
+#include "xenfs.h"
+#include "../xenbus/xenbus_comms.h"
+
+static ssize_t xsd_read(struct file *file, char __user *buf,
+                           size_t size, loff_t *off)
+{
+       const char *str = (const char *)file->private_data;
+       return simple_read_from_buffer(buf, size, off, str, strlen(str));
+}
+
+static int xsd_release(struct inode *inode, struct file *file)
+{
+       kfree(file->private_data);
+       return 0;
+}
+
+static int xsd_kva_open(struct inode *inode, struct file *file)
+{
+       file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
+                                              xen_store_interface);
+       if (!file->private_data)
+               return -ENOMEM;
+       return 0;
+}
+
+static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
+{
+       size_t size = vma->vm_end - vma->vm_start;
+
+       if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
+               return -EINVAL;
+
+       if (remap_pfn_range(vma, vma->vm_start,
+                           virt_to_pfn(xen_store_interface),
+                           size, vma->vm_page_prot))
+               return -EAGAIN;
+
+       return 0;
+}
+
+const struct file_operations xsd_kva_file_ops = {
+       .open = xsd_kva_open,
+       .mmap = xsd_kva_mmap,
+       .read = xsd_read,
+       .release = xsd_release,
+};
+
+static int xsd_port_open(struct inode *inode, struct file *file)
+{
+       file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
+                                              xen_store_evtchn);
+       if (!file->private_data)
+               return -ENOMEM;
+       return 0;
+}
+
+const struct file_operations xsd_port_file_ops = {
+       .open = xsd_port_open,
+       .read = xsd_read,
+       .release = xsd_release,
+};