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Viewing changes to driver/dev.c

  • Committer: Suren A. Chilingaryan
  • Date: 2016-05-13 23:10:33 UTC
  • Revision ID: csa@suren.me-20160513231033-deh0biipgpln877s
Allow mapping of arbitrary memory areas

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Lines of Context:
driver/dev.c
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#endif /* PCIDRIVER_DUMMY_DEVICE */
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}
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static int pcidriver_mmap_area(pcidriver_privdata_t *privdata, struct vm_area_struct *vmap)
 
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{
 
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    int ret = 0;
 
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    unsigned long vma_size;
 
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    unsigned long addr = vmap->vm_pgoff;
 
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    mod_info_dbg("Entering mmap_addr\n");
 
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    /* Check sizes */
 
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    vma_size = (vmap->vm_end - vmap->vm_start);
 
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    if (addr % PAGE_SIZE) {
 
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        mod_info("mmap addr (0x%lx) is not aligned to page boundary\n", addr);
 
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        return -EINVAL;
 
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    }
 
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    ret = remap_pfn_range(vmap, vmap->vm_start, (addr >> PAGE_SHIFT), vma_size, vmap->vm_page_prot);
 
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    if (ret) {
 
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        mod_info("remap_pfn_range failed\n");
 
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        return -EAGAIN;
 
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    }
 
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    return 0;   /* success */
 
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}
 
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/**
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 *
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 * This function is the entry point for mmap() and calls either pcidriver_mmap_bar
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        }
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        ret = pcidriver_mmap_bar(privdata, vma, bar);
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        break;
 
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    case PCIDRIVER_MMAP_AREA:
 
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        ret = pcidriver_mmap_area(privdata, vma);
 
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        break;
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    case PCIDRIVER_MMAP_KMEM:
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        ret = pcidriver_mmap_kmem(privdata, vma);
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        break;