655d406a7c
These are used by the userspace xenstore daemon, which runs in dom0. Xenstored is what's behind the xenfs "xenbus" filesystem. [ Impact: provide mapping and port to usermode for xenstore ] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <xen/page.h>
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#include "xenfs.h"
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#include "../xenbus/xenbus_comms.h"
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static ssize_t xsd_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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const char *str = (const char *)file->private_data;
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return simple_read_from_buffer(buf, size, off, str, strlen(str));
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}
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static int xsd_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static int xsd_kva_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
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xen_store_interface);
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if (!file->private_data)
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return -ENOMEM;
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return 0;
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}
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static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
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{
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size_t size = vma->vm_end - vma->vm_start;
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if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
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return -EINVAL;
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if (remap_pfn_range(vma, vma->vm_start,
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virt_to_pfn(xen_store_interface),
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size, vma->vm_page_prot))
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return -EAGAIN;
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return 0;
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}
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const struct file_operations xsd_kva_file_ops = {
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.open = xsd_kva_open,
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.mmap = xsd_kva_mmap,
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.read = xsd_read,
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.release = xsd_release,
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};
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static int xsd_port_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
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xen_store_evtchn);
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if (!file->private_data)
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return -ENOMEM;
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return 0;
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}
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const struct file_operations xsd_port_file_ops = {
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.open = xsd_port_open,
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.read = xsd_read,
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.release = xsd_release,
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};
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