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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common-spectral.h (6210B)


      1/*
      2 * Copyright (c) 2013 Qualcomm Atheros, Inc.
      3 *
      4 * Permission to use, copy, modify, and/or distribute this software for any
      5 * purpose with or without fee is hereby granted, provided that the above
      6 * copyright notice and this permission notice appear in all copies.
      7 *
      8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15 */
     16
     17#ifndef SPECTRAL_H
     18#define SPECTRAL_H
     19
     20#include "../spectral_common.h"
     21
     22/* enum spectral_mode:
     23 *
     24 * @SPECTRAL_DISABLED: spectral mode is disabled
     25 * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
     26 *	something else.
     27 * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
     28 *	is performed manually.
     29 * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
     30 *	during a channel scan.
     31 */
     32enum spectral_mode {
     33	SPECTRAL_DISABLED = 0,
     34	SPECTRAL_BACKGROUND,
     35	SPECTRAL_MANUAL,
     36	SPECTRAL_CHANSCAN,
     37};
     38
     39#define SPECTRAL_SCAN_BITMASK		0x10
     40/* Radar info packet format, used for DFS and spectral formats. */
     41struct ath_radar_info {
     42	u8 pulse_length_pri;
     43	u8 pulse_length_ext;
     44	u8 pulse_bw_info;
     45} __packed;
     46
     47/* The HT20 spectral data has 4 bytes of additional information at it's end.
     48 *
     49 * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
     50 * [7:0]: all bins  max_magnitude[9:2]
     51 * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
     52 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
     53 */
     54struct ath_ht20_mag_info {
     55	u8 all_bins[3];
     56	u8 max_exp;
     57} __packed;
     58
     59/* WARNING: don't actually use this struct! MAC may vary the amount of
     60 * data by -1/+2. This struct is for reference only.
     61 */
     62struct ath_ht20_fft_packet {
     63	u8 data[SPECTRAL_HT20_NUM_BINS];
     64	struct ath_ht20_mag_info mag_info;
     65	struct ath_radar_info radar_info;
     66} __packed;
     67
     68#define SPECTRAL_HT20_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_fft_packet))
     69#define	SPECTRAL_HT20_SAMPLE_LEN	(sizeof(struct ath_ht20_mag_info) +\
     70					SPECTRAL_HT20_NUM_BINS)
     71
     72/* Dynamic 20/40 mode:
     73 *
     74 * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
     75 * [7:0]: lower bins  max_magnitude[9:2]
     76 * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
     77 * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
     78 * [7:0]: upper bins  max_magnitude[9:2]
     79 * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
     80 * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
     81 */
     82struct ath_ht20_40_mag_info {
     83	u8 lower_bins[3];
     84	u8 upper_bins[3];
     85	u8 max_exp;
     86} __packed;
     87
     88/* WARNING: don't actually use this struct! MAC may vary the amount of
     89 * data. This struct is for reference only.
     90 */
     91struct ath_ht20_40_fft_packet {
     92	u8 data[SPECTRAL_HT20_40_NUM_BINS];
     93	struct ath_ht20_40_mag_info mag_info;
     94	struct ath_radar_info radar_info;
     95} __packed;
     96
     97struct ath_spec_scan_priv {
     98	struct ath_hw *ah;
     99	/* relay(fs) channel for spectral scan */
    100	struct rchan *rfs_chan_spec_scan;
    101	enum spectral_mode spectral_mode;
    102	struct ath_spec_scan spec_config;
    103};
    104
    105#define SPECTRAL_HT20_40_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_40_fft_packet))
    106#define	SPECTRAL_HT20_40_SAMPLE_LEN	(sizeof(struct ath_ht20_40_mag_info) +\
    107					SPECTRAL_HT20_40_NUM_BINS)
    108
    109#define	SPECTRAL_SAMPLE_MAX_LEN		SPECTRAL_HT20_40_SAMPLE_LEN
    110
    111/* grabs the max magnitude from the all/upper/lower bins */
    112static inline u16 spectral_max_magnitude(u8 *bins)
    113{
    114	return (bins[0] & 0xc0) >> 6 |
    115	       (bins[1] & 0xff) << 2 |
    116	       (bins[2] & 0x03) << 10;
    117}
    118
    119/* return the max magnitude from the all/upper/lower bins */
    120static inline u8 spectral_max_index(u8 *bins, int num_bins)
    121{
    122	s8 m = (bins[2] & 0xfc) >> 2;
    123	u8 zero_idx = num_bins / 2;
    124
    125	/* It's a 5 bit signed int, remove its sign and use one's
    126	 * complement interpretation to add the sign back to the 8
    127	 * bit int
    128	 */
    129	if (m & 0x20) {
    130		m &= ~0x20;
    131		m |= 0xe0;
    132	}
    133
    134	/* Bring the zero point to the beginning
    135	 * instead of the middle so that we can use
    136	 * it for array lookup and that we don't deal
    137	 * with negative values later
    138	 */
    139	m += zero_idx;
    140
    141	/* Sanity check to make sure index is within bounds */
    142	if (m < 0 || m > num_bins - 1)
    143		m = 0;
    144
    145	return m;
    146}
    147
    148static inline u8 spectral_max_index_ht40(u8 *bins)
    149{
    150	u8 idx;
    151
    152	idx = spectral_max_index(bins, SPECTRAL_HT20_40_NUM_BINS);
    153
    154	/* positive values and zero are starting at the beginning
    155	 * of the data field.
    156	 */
    157	return idx % (SPECTRAL_HT20_40_NUM_BINS / 2);
    158}
    159
    160static inline u8 spectral_max_index_ht20(u8 *bins)
    161{
    162	return spectral_max_index(bins, SPECTRAL_HT20_NUM_BINS);
    163}
    164
    165/* return the bitmap weight from the all/upper/lower bins */
    166static inline u8 spectral_bitmap_weight(u8 *bins)
    167{
    168	return bins[0] & 0x3f;
    169}
    170
    171#ifdef CONFIG_ATH9K_COMMON_SPECTRAL
    172void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
    173void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);
    174
    175void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
    176				 struct ath_spec_scan_priv *spec_priv);
    177int ath9k_cmn_spectral_scan_config(struct ath_common *common,
    178			       struct ath_spec_scan_priv *spec_priv,
    179			       enum spectral_mode spectral_mode);
    180int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
    181		    struct ath_rx_status *rs, u64 tsf);
    182#else
    183static inline void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv,
    184						 struct dentry *debugfs_phy)
    185{
    186}
    187
    188static inline void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv)
    189{
    190}
    191
    192static inline void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
    193						   struct ath_spec_scan_priv *spec_priv)
    194{
    195}
    196
    197static inline int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv,
    198				      struct ieee80211_hdr *hdr,
    199				      struct ath_rx_status *rs, u64 tsf)
    200{
    201	return 0;
    202}
    203#endif /* CONFIG_ATH9K_COMMON_SPECTRAL */
    204
    205#endif /* SPECTRAL_H */