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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cvmx-helper-loop.c (2712B)

      1/***********************license start***************
      2 * Author: Cavium Networks
      3 *
      4 * Contact: support@caviumnetworks.com
      5 * This file is part of the OCTEON SDK
      6 *
      7 * Copyright (c) 2003-2008 Cavium Networks
      8 *
      9 * This file is free software; you can redistribute it and/or modify
     10 * it under the terms of the GNU General Public License, Version 2, as
     11 * published by the Free Software Foundation.
     12 *
     13 * This file is distributed in the hope that it will be useful, but
     14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
     15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
     16 * NONINFRINGEMENT.  See the GNU General Public License for more
     17 * details.
     18 *
     19 * You should have received a copy of the GNU General Public License
     20 * along with this file; if not, write to the Free Software
     21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
     22 * or visit http://www.gnu.org/licenses/.
     23 *
     24 * This file may also be available under a different license from Cavium.
     25 * Contact Cavium Networks for more information
     26 ***********************license end**************************************/
     27
     28/*
     29 * Functions for LOOP initialization, configuration,
     30 * and monitoring.
     31 */
     32#include <asm/octeon/octeon.h>
     33
     34#include <asm/octeon/cvmx-config.h>
     35
     36#include <asm/octeon/cvmx-helper.h>
     37#include <asm/octeon/cvmx-pip-defs.h>
     38
     39/**
     40 * Probe a LOOP interface and determine the number of ports
     41 * connected to it. The LOOP interface should still be down
     42 * after this call.
     43 *
     44 * @interface: Interface to probe
     45 *
     46 * Returns Number of ports on the interface. Zero to disable.
     47 */
     48int __cvmx_helper_loop_probe(int interface)
     49{
     50	union cvmx_ipd_sub_port_fcs ipd_sub_port_fcs;
     51	int num_ports = 4;
     52	int port;
     53
     54	/* We need to disable length checking so packet < 64 bytes and jumbo
     55	   frames don't get errors */
     56	for (port = 0; port < num_ports; port++) {
     57		union cvmx_pip_prt_cfgx port_cfg;
     58		int ipd_port = cvmx_helper_get_ipd_port(interface, port);
     59		port_cfg.u64 = cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
     60		port_cfg.s.maxerr_en = 0;
     61		port_cfg.s.minerr_en = 0;
     62		cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port), port_cfg.u64);
     63	}
     64
     65	/* Disable FCS stripping for loopback ports */
     66	ipd_sub_port_fcs.u64 = cvmx_read_csr(CVMX_IPD_SUB_PORT_FCS);
     67	ipd_sub_port_fcs.s.port_bit2 = 0;
     68	cvmx_write_csr(CVMX_IPD_SUB_PORT_FCS, ipd_sub_port_fcs.u64);
     69	return num_ports;
     70}
     71
     72/**
     73 * Bringup and enable a LOOP interface. After this call packet
     74 * I/O should be fully functional. This is called with IPD
     75 * enabled but PKO disabled.
     76 *
     77 * @interface: Interface to bring up
     78 *
     79 * Returns Zero on success, negative on failure
     80 */
     81int __cvmx_helper_loop_enable(int interface)
     82{
     83	/* Do nothing. */
     84	return 0;
     85}