Commit | Line | Data |
---|---|---|
655d406a IC |
1 | #include <linux/slab.h> |
2 | #include <linux/types.h> | |
3 | #include <linux/mm.h> | |
4 | #include <linux/fs.h> | |
5 | ||
6 | #include <xen/page.h> | |
7 | ||
8 | #include "xenfs.h" | |
9 | #include "../xenbus/xenbus_comms.h" | |
10 | ||
11 | static ssize_t xsd_read(struct file *file, char __user *buf, | |
12 | size_t size, loff_t *off) | |
13 | { | |
14 | const char *str = (const char *)file->private_data; | |
15 | return simple_read_from_buffer(buf, size, off, str, strlen(str)); | |
16 | } | |
17 | ||
18 | static int xsd_release(struct inode *inode, struct file *file) | |
19 | { | |
20 | kfree(file->private_data); | |
21 | return 0; | |
22 | } | |
23 | ||
24 | static int xsd_kva_open(struct inode *inode, struct file *file) | |
25 | { | |
26 | file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p", | |
27 | xen_store_interface); | |
28 | if (!file->private_data) | |
29 | return -ENOMEM; | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma) | |
34 | { | |
35 | size_t size = vma->vm_end - vma->vm_start; | |
36 | ||
37 | if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0)) | |
38 | return -EINVAL; | |
39 | ||
40 | if (remap_pfn_range(vma, vma->vm_start, | |
41 | virt_to_pfn(xen_store_interface), | |
42 | size, vma->vm_page_prot)) | |
43 | return -EAGAIN; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | const struct file_operations xsd_kva_file_ops = { | |
49 | .open = xsd_kva_open, | |
50 | .mmap = xsd_kva_mmap, | |
51 | .read = xsd_read, | |
52 | .release = xsd_release, | |
53 | }; | |
54 | ||
55 | static int xsd_port_open(struct inode *inode, struct file *file) | |
56 | { | |
57 | file->private_data = (void *)kasprintf(GFP_KERNEL, "%d", | |
58 | xen_store_evtchn); | |
59 | if (!file->private_data) | |
60 | return -ENOMEM; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | const struct file_operations xsd_port_file_ops = { | |
65 | .open = xsd_port_open, | |
66 | .read = xsd_read, | |
67 | .release = xsd_release, | |
68 | }; |