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-mapping.h (928B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_DMA_MAPPING_H
      3#define _LINUX_DMA_MAPPING_H
      4
      5#ifdef CONFIG_HAS_DMA
      6# error Virtio userspace code does not support CONFIG_HAS_DMA
      7#endif
      8
      9enum dma_data_direction {
     10	DMA_BIDIRECTIONAL = 0,
     11	DMA_TO_DEVICE = 1,
     12	DMA_FROM_DEVICE = 2,
     13	DMA_NONE = 3,
     14};
     15
     16#define dma_alloc_coherent(d, s, hp, f) ({ \
     17	void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
     18	*(hp) = (unsigned long)__dma_alloc_coherent_p; \
     19	__dma_alloc_coherent_p; \
     20})
     21
     22#define dma_free_coherent(d, s, p, h) kfree(p)
     23
     24#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
     25
     26#define dma_map_single(d, p, s, dir) (virt_to_phys(p))
     27#define dma_mapping_error(...) (0)
     28
     29#define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
     30#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
     31
     32#define dma_max_mapping_size(...) SIZE_MAX
     33
     34#endif