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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", | |
63d9c273 MT |
27 | #ifdef CONFIG_GRKERNSEC_HIDESYM |
28 | NULL); | |
29 | #else | |
655d406a | 30 | xen_store_interface); |
63d9c273 MT |
31 | #endif |
32 | ||
655d406a IC |
33 | if (!file->private_data) |
34 | return -ENOMEM; | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma) | |
39 | { | |
40 | size_t size = vma->vm_end - vma->vm_start; | |
41 | ||
42 | if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0)) | |
43 | return -EINVAL; | |
44 | ||
45 | if (remap_pfn_range(vma, vma->vm_start, | |
46 | virt_to_pfn(xen_store_interface), | |
47 | size, vma->vm_page_prot)) | |
48 | return -EAGAIN; | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | const struct file_operations xsd_kva_file_ops = { | |
54 | .open = xsd_kva_open, | |
55 | .mmap = xsd_kva_mmap, | |
56 | .read = xsd_read, | |
57 | .release = xsd_release, | |
58 | }; | |
59 | ||
60 | static int xsd_port_open(struct inode *inode, struct file *file) | |
61 | { | |
62 | file->private_data = (void *)kasprintf(GFP_KERNEL, "%d", | |
63 | xen_store_evtchn); | |
64 | if (!file->private_data) | |
65 | return -ENOMEM; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | const struct file_operations xsd_port_file_ops = { | |
70 | .open = xsd_port_open, | |
71 | .read = xsd_read, | |
72 | .release = xsd_release, | |
73 | }; |