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| // SPDX-License-Identifier: GPL-2.0
| #include <linux/slab.h>
| #include <linux/types.h>
| #include <linux/mm.h>
| #include <linux/fs.h>
|
| #include <xen/page.h>
| #include <xen/xenbus.h>
|
| #include "xenfs.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,
| };
|
|
