cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ip32-dma.c (949B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2006  Ralf Baechle <ralf@linux-mips.org>
      4 */
      5#include <linux/dma-direct.h>
      6#include <asm/ip32/crime.h>
      7
      8/*
      9 * Few notes.
     10 * 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M
     11 * 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for
     12 *    native-endian)
     13 * 3. All other devices see memory as one big chunk at 0x40000000
     14 * 4. Non-PCI devices will pass NULL as struct device*
     15 *
     16 * Thus we translate differently, depending on device.
     17 */
     18
     19#define RAM_OFFSET_MASK 0x3fffffffUL
     20
     21dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
     22{
     23	dma_addr_t dma_addr = paddr & RAM_OFFSET_MASK;
     24
     25	if (!dev)
     26		dma_addr += CRIME_HI_MEM_BASE;
     27	return dma_addr;
     28}
     29
     30phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
     31{
     32	phys_addr_t paddr = dma_addr & RAM_OFFSET_MASK;
     33
     34	if (dma_addr >= 256*1024*1024)
     35		paddr += CRIME_HI_MEM_BASE;
     36	return paddr;
     37}