C++ (Cpp) pci_get_legacy_memの例

コード例 #1

ファイル: pci.c プロジェクト: hugh-smtl/linux-2.6

/**
 * pci_mmap_legacy_page_range - map legacy memory space to userland
 * @bus: bus whose legacy space we're mapping
 * @vma: vma passed in by mmap
 *
 * Map legacy memory space for this device back to userspace using a machine
 * vector to get the base address.
 */
int
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
{
	unsigned long size = vma->vm_end - vma->vm_start;
	pgprot_t prot;
	char *addr;

	/*
	 * Avoid attribute aliasing.  See Documentation/ia64/aliasing.txt
	 * for more details.
	 */
	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
		return -EINVAL;
	prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
				    vma->vm_page_prot);

	addr = pci_get_legacy_mem(bus);
	if (IS_ERR(addr))
		return PTR_ERR(addr);

	vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
	vma->vm_page_prot = prot;

	if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			    size, vma->vm_page_prot))
		return -EAGAIN;

	return 0;
}

コード例 #2

ファイル: pci.c プロジェクト: ut-osa/syncchar

/**
 * pci_mmap_legacy_page_range - map legacy memory space to userland
 * @bus: bus whose legacy space we're mapping
 * @vma: vma passed in by mmap
 *
 * Map legacy memory space for this device back to userspace using a machine
 * vector to get the base address.
 */
int
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
{
	char *addr;

	addr = pci_get_legacy_mem(bus);
	if (IS_ERR(addr))
		return PTR_ERR(addr);

	vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);

	if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			    vma->vm_end - vma->vm_start, vma->vm_page_prot))
		return -EAGAIN;

	return 0;
}