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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nicstarmac.copyright (2785B)

      1/* nicstar.c  v0.22  Jawaid Bazyar (bazyar@hypermall.com)
      2 * nicstar.c, M. Welsh (matt.welsh@cl.cam.ac.uk)
      3 *
      4 * Hacked October, 1997 by Jawaid Bazyar, Interlink Advertising Services Inc.
      5 * 	http://www.hypermall.com/
      6 * 10/1/97 - commented out CFG_PHYIE bit - we don't care when the PHY
      7 *	interrupts us (except possibly for removal/insertion of the cable?)
      8 * 10/4/97 - began heavy inline documentation of the code. Corrected typos
      9 *	and spelling mistakes.
     10 * 10/5/97 - added code to handle PHY interrupts, disable PHY on
     11 *	loss of link, and correctly re-enable PHY when link is
     12 *	re-established. (put back CFG_PHYIE)
     13 *
     14 *   Modified to work with the IDT7721 nicstar -- AAL5 (tested) only.
     15 *
     16 * R. D. Rechenmacher <ron@fnal.gov>, Aug. 6, 1997
     17 *
     18 * Linux driver for the IDT77201 NICStAR PCI ATM controller.
     19 * PHY component is expected to be 155 Mbps S/UNI-Lite or IDT 77155;
     20 * see init_nicstar() for PHY initialization to change this. This driver
     21 * expects the Linux ATM stack to support scatter-gather lists 
     22 * (skb->atm.iovcnt != 0) for Rx skb's passed to vcc->push.
     23 *
     24 * Implementing minimal-copy of received data:
     25 *   IDT always receives data into a small buffer, then large buffers
     26 *     as needed. This means that data must always be copied to create
     27 *     the linear buffer needed by most non-ATM protocol stacks (e.g. IP)
     28 *     Fix is simple: make large buffers large enough to hold entire
     29 *     SDU, and leave <small_buffer_data> bytes empty at the start. Then
     30 *     copy small buffer contents to head of large buffer.
     31 *   Trick is to avoid fragmenting Linux, due to need for a lot of large
     32 *     buffers. This is done by 2 things:
     33 *       1) skb->destructor / skb->atm.recycle_buffer
     34 *            combined, allow nicstar_free_rx_skb to be called to
     35 *            recycle large data buffers
     36 *       2) skb_clone of received buffers
     37 *   See nicstar_free_rx_skb and linearize_buffer for implementation
     38 *     details.
     39 *
     40 *
     41 *
     42 * Copyright (c) 1996 University of Cambridge Computer Laboratory
     43 *
     44 *   This program is free software; you can redistribute it and/or modify
     45 *   it under the terms of the GNU General Public License as published by
     46 *   the Free Software Foundation; either version 2 of the License, or
     47 *   (at your option) any later version.
     48 * 
     49 *   This program is distributed in the hope that it will be useful,
     50 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
     51 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     52 *   GNU General Public License for more details.
     53 *
     54 *   You should have received a copy of the GNU General Public License
     55 *   along with this program; if not, write to the Free Software
     56 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     57 *
     58 * M. Welsh, 6 July 1996
     59 *
     60 *
     61 */