contiki/cpu/x86/drivers/quarkX1000/imr-conf.c

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/*
* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "dma.h"
#include "imr.h"
#include "msg-bus.h"
/*---------------------------------------------------------------------------*/
void
quarkX1000_imr_conf(void)
{
quarkX1000_imr_t imr;
int imr_idx = 0;
imr.lo.raw = 0;
imr.hi.raw = 0;
imr.rdmsk.raw = 0;
imr.wrmsk.raw = 0;
imr.lo.lock = 1;
imr.rdmsk.cpu0 = imr.rdmsk.cpu_0 = 1;
imr.wrmsk.cpu0 = imr.wrmsk.cpu_0 = 1;
quarkX1000_msg_bus_init();
imr.lo.addr = 0;
imr.hi.addr = (((uint32_t)&_sbss_dma_addr) - 1) >> QUARKX1000_IMR_SHAMT;
quarkX1000_imr_write(imr_idx, imr);
imr_idx++;
imr.lo.addr = ((uint32_t)&_ebss_dma_addr) >> QUARKX1000_IMR_SHAMT;
imr.hi.addr = ~0;
quarkX1000_imr_write(imr_idx, imr);
imr_idx++;
imr.lo.addr = 0;
imr.hi.addr = 0;
imr.rdmsk.raw = ~0;
imr.wrmsk.raw = ~0;
/* Lock the other IMRs open */
while(imr_idx < QUARKX1000_IMR_CNT) {
quarkX1000_imr_write(imr_idx, imr);
imr_idx++;
}
#ifndef DBG_IMRS
/* The IMRs are locked by the hardware, but the message bus could still
* provide access to other potentially-sensitive functionality.
*/
quarkX1000_msg_bus_lock();
#endif
}
/*---------------------------------------------------------------------------*/