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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range.c (3898B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * comedi/range.c
      4 * comedi routines for voltage ranges
      5 *
      6 * COMEDI - Linux Control and Measurement Device Interface
      7 * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
      8 */
      9
     10#include <linux/uaccess.h>
     11#include <linux/comedi/comedidev.h>
     12#include "comedi_internal.h"
     13
     14const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
     15EXPORT_SYMBOL_GPL(range_bipolar10);
     16const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
     17EXPORT_SYMBOL_GPL(range_bipolar5);
     18const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
     19EXPORT_SYMBOL_GPL(range_bipolar2_5);
     20const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
     21EXPORT_SYMBOL_GPL(range_unipolar10);
     22const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
     23EXPORT_SYMBOL_GPL(range_unipolar5);
     24const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };
     25EXPORT_SYMBOL_GPL(range_unipolar2_5);
     26const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
     27EXPORT_SYMBOL_GPL(range_0_20mA);
     28const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
     29EXPORT_SYMBOL_GPL(range_4_20mA);
     30const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };
     31EXPORT_SYMBOL_GPL(range_0_32mA);
     32const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
     33EXPORT_SYMBOL_GPL(range_unknown);
     34
     35/*
     36 * COMEDI_RANGEINFO ioctl
     37 * range information
     38 *
     39 * arg:
     40 *	pointer to comedi_rangeinfo structure
     41 *
     42 * reads:
     43 *	comedi_rangeinfo structure
     44 *
     45 * writes:
     46 *	array of comedi_krange structures to rangeinfo->range_ptr pointer
     47 */
     48int do_rangeinfo_ioctl(struct comedi_device *dev,
     49		       struct comedi_rangeinfo *it)
     50{
     51	int subd, chan;
     52	const struct comedi_lrange *lr;
     53	struct comedi_subdevice *s;
     54
     55	subd = (it->range_type >> 24) & 0xf;
     56	chan = (it->range_type >> 16) & 0xff;
     57
     58	if (!dev->attached)
     59		return -EINVAL;
     60	if (subd >= dev->n_subdevices)
     61		return -EINVAL;
     62	s = &dev->subdevices[subd];
     63	if (s->range_table) {
     64		lr = s->range_table;
     65	} else if (s->range_table_list) {
     66		if (chan >= s->n_chan)
     67			return -EINVAL;
     68		lr = s->range_table_list[chan];
     69	} else {
     70		return -EINVAL;
     71	}
     72
     73	if (RANGE_LENGTH(it->range_type) != lr->length) {
     74		dev_dbg(dev->class_dev,
     75			"wrong length %d should be %d (0x%08x)\n",
     76			RANGE_LENGTH(it->range_type),
     77			lr->length, it->range_type);
     78		return -EINVAL;
     79	}
     80
     81	if (copy_to_user(it->range_ptr, lr->range,
     82			 sizeof(struct comedi_krange) * lr->length))
     83		return -EFAULT;
     84
     85	return 0;
     86}
     87
     88/**
     89 * comedi_check_chanlist() - Validate each element in a chanlist.
     90 * @s: comedi_subdevice struct
     91 * @n: number of elements in the chanlist
     92 * @chanlist: the chanlist to validate
     93 *
     94 * Each element consists of a channel number, a range index, an analog
     95 * reference type and some flags, all packed into an unsigned int.
     96 *
     97 * This checks that the channel number and range index are supported by
     98 * the comedi subdevice.  It does not check whether the analog reference
     99 * type and the flags are supported.  Drivers that care should check those
    100 * themselves.
    101 *
    102 * Return: %0 if all @chanlist elements are valid (success),
    103 *         %-EINVAL if one or more elements are invalid.
    104 */
    105int comedi_check_chanlist(struct comedi_subdevice *s, int n,
    106			  unsigned int *chanlist)
    107{
    108	struct comedi_device *dev = s->device;
    109	unsigned int chanspec;
    110	int chan, range_len, i;
    111
    112	for (i = 0; i < n; i++) {
    113		chanspec = chanlist[i];
    114		chan = CR_CHAN(chanspec);
    115		if (s->range_table)
    116			range_len = s->range_table->length;
    117		else if (s->range_table_list && chan < s->n_chan)
    118			range_len = s->range_table_list[chan]->length;
    119		else
    120			range_len = 0;
    121		if (chan >= s->n_chan ||
    122		    CR_RANGE(chanspec) >= range_len) {
    123			dev_warn(dev->class_dev,
    124				 "bad chanlist[%d]=0x%08x chan=%d range length=%d\n",
    125				 i, chanspec, chan, range_len);
    126			return -EINVAL;
    127		}
    128	}
    129	return 0;
    130}
    131EXPORT_SYMBOL_GPL(comedi_check_chanlist);