cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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proc.c (1983B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  ISA Plug & Play support
      4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
      5 */
      6
      7#include <linux/module.h>
      8#include <linux/isapnp.h>
      9#include <linux/proc_fs.h>
     10#include <linux/init.h>
     11#include <linux/uaccess.h>
     12
     13extern struct pnp_protocol isapnp_protocol;
     14
     15static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
     16
     17static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
     18{
     19	return fixed_size_llseek(file, off, whence, 256);
     20}
     21
     22static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
     23				    size_t nbytes, loff_t * ppos)
     24{
     25	struct pnp_dev *dev = pde_data(file_inode(file));
     26	int pos = *ppos;
     27	int cnt, size = 256;
     28
     29	if (pos >= size)
     30		return 0;
     31	if (nbytes >= size)
     32		nbytes = size;
     33	if (pos + nbytes > size)
     34		nbytes = size - pos;
     35	cnt = nbytes;
     36
     37	if (!access_ok(buf, cnt))
     38		return -EINVAL;
     39
     40	isapnp_cfg_begin(dev->card->number, dev->number);
     41	for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
     42		unsigned char val;
     43		val = isapnp_read_byte(pos);
     44		__put_user(val, buf);
     45	}
     46	isapnp_cfg_end();
     47
     48	*ppos = pos;
     49	return nbytes;
     50}
     51
     52static const struct proc_ops isapnp_proc_bus_proc_ops = {
     53	.proc_lseek	= isapnp_proc_bus_lseek,
     54	.proc_read	= isapnp_proc_bus_read,
     55};
     56
     57static int isapnp_proc_attach_device(struct pnp_dev *dev)
     58{
     59	struct pnp_card *bus = dev->card;
     60	char name[16];
     61
     62	if (!bus->procdir) {
     63		sprintf(name, "%02x", bus->number);
     64		bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
     65		if (!bus->procdir)
     66			return -ENOMEM;
     67	}
     68	sprintf(name, "%02x", dev->number);
     69	dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, bus->procdir,
     70					    &isapnp_proc_bus_proc_ops, dev);
     71	if (!dev->procent)
     72		return -ENOMEM;
     73	proc_set_size(dev->procent, 256);
     74	return 0;
     75}
     76
     77int __init isapnp_proc_init(void)
     78{
     79	struct pnp_dev *dev;
     80
     81	isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
     82	protocol_for_each_dev(&isapnp_protocol, dev) {
     83		isapnp_proc_attach_device(dev);
     84	}
     85	return 0;
     86}