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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dma-swiotlb.c (626B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Contains routines needed to support swiotlb for ppc.
      4 *
      5 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
      6 * Author: Becky Bruce
      7 */
      8#include <linux/memblock.h>
      9#include <asm/machdep.h>
     10#include <asm/swiotlb.h>
     11
     12unsigned int ppc_swiotlb_enable;
     13unsigned int ppc_swiotlb_flags;
     14
     15void __init swiotlb_detect_4g(void)
     16{
     17	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
     18		ppc_swiotlb_enable = 1;
     19}
     20
     21static int __init check_swiotlb_enabled(void)
     22{
     23	if (ppc_swiotlb_enable)
     24		swiotlb_print_info();
     25	else
     26		swiotlb_exit();
     27
     28	return 0;
     29}
     30subsys_initcall(check_swiotlb_enabled);