Question

我试图交叉编译JetStream驱动程序，以通过PCIe与ARM（hf）Cortex A CPU（在NVIDIA TK1模块上）桥接FPGA。

github页面提到它已移植到Linux内核版本3.10，恰好也是Linux 4 Tegra（L4T）内核版本。

驱动程序的mmap函数实现显然使用x86特定的内核函数来设置一些缓存属性： set_memory_uc 和 set_memory_wb 。这是mmap源代码，底部使用了提到的功能：

static int mmap(struct file* file, struct vm_area_struct* vma) {
    int ret;
    int slot     = (uintptr_t)PDE_DATA(__parent(__parent(file->f_path.dentry))->d_inode);
    int channel  = (uintptr_t)proc_get_parent_data(file->f_inode);
    int bufferNo = (uintptr_t)PDE_DATA(file->f_inode);

    struct fpga_board* board = &FPCI3.boards[slot];
    struct buffer* buffer = &board->channel[channel].buffer[bufferNo];

    //printk("DATA Board id %d:%d:%d\n", slot, channel, buffer);

    vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
    //vma->vm_page_prot = 0;
    vma->vm_page_prot   = pgprot_noncached(vma->vm_page_prot);

    //return ENOMEM;
    set_memory_uc((uintptr_t)buffer->memoryAddress, getPageCount(BUF_SIZE));
    ret=dma_mmap_attrs(&board->pcidev->dev, vma, buffer->memoryAddress, buffer->dmaAddress, BUF_SIZE, 0);
    set_memory_wb((uintptr_t)buffer->memoryAddress, getPageCount(BUF_SIZE));
    return ret;
}

（如何）为我的ARM CPU复制预期的行为？

Source

编辑：这里提到它们是特定于x86的，并且由于缺少它们而无法编译：Link

set_memory_uc是否等效于ARM？

0 个答案: