93126b57bb
This patch configures Isolated Memory Regions (IMRs) to block DMA to code and data regions that do not contain any data that needs to be DMA-accessible.
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "imr.h"
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extern int _sbss_dma_addr, _ebss_dma_addr;
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/*---------------------------------------------------------------------------*/
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void
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quarkX1000_imr_conf(void)
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{
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quarkX1000_imr_t imr;
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int imr_idx = 0;
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imr.lo.raw = 0;
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imr.hi.raw = 0;
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imr.rdmsk.raw = 0;
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imr.wrmsk.raw = 0;
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imr.lo.lock = 1;
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imr.rdmsk.cpu0 = imr.rdmsk.cpu_0 = 1;
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imr.wrmsk.cpu0 = imr.wrmsk.cpu_0 = 1;
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imr.lo.addr = 0;
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imr.hi.addr = (((uint32_t)&_sbss_dma_addr) - 1) >> QUARKX1000_IMR_SHAMT;
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quarkX1000_imr_write(imr_idx, imr);
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imr_idx++;
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imr.lo.addr = ((uint32_t)&_ebss_dma_addr) >> QUARKX1000_IMR_SHAMT;
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imr.hi.addr = ~0;
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quarkX1000_imr_write(imr_idx, imr);
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imr_idx++;
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imr.lo.addr = 0;
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imr.hi.addr = 0;
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imr.rdmsk.raw = ~0;
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imr.wrmsk.raw = ~0;
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/* Lock the other IMRs open */
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while(imr_idx < QUARKX1000_IMR_CNT) {
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quarkX1000_imr_write(imr_idx, imr);
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imr_idx++;
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}
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}
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/*---------------------------------------------------------------------------*/
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