C++ (Cpp) io_remap_pud_range Exemples

Exemple #1

int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
		unsigned long pfn, unsigned long size, pgprot_t prot)
{
	int error = 0;
	pgd_t * dir;
	unsigned long beg = from;
	unsigned long end = from + size;
	struct mm_struct *mm = vma->vm_mm;
	int space = GET_IOSPACE(pfn);
	unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;

	prot = __pgprot(pg_iobits);
	offset -= from;
	dir = pgd_offset(mm, from);
	flush_cache_range(vma, beg, end);

	spin_lock(&mm->page_table_lock);
	while (from < end) {
		pud_t *pud = pud_alloc(current->mm, dir, from);
		error = -ENOMEM;
		if (!pud)
			break;
		error = io_remap_pud_range(mm, pud, from, end - from, offset + from, prot, space);
		if (error)
			break;
		from = (from + PGDIR_SIZE) & PGDIR_MASK;
		dir++;
	}
	flush_tlb_range(vma, beg, end);
	spin_unlock(&mm->page_table_lock);

	return error;
}

Exemple #2

Fichier : generic.c Projet : mahyarmd/unifi-gpl

int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
		unsigned long pfn, unsigned long size, pgprot_t prot)
{
	int error = 0;
	pgd_t * dir;
	unsigned long beg = from;
	unsigned long end = from + size;
	struct mm_struct *mm = vma->vm_mm;
	int space = GET_IOSPACE(pfn);
	unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
	unsigned long phys_base;

	phys_base = offset | (((unsigned long) space) << 32UL);

	/* See comment in mm/memory.c remap_pfn_range */
	vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
	vma->vm_pgoff = phys_base >> PAGE_SHIFT;

	prot = __pgprot(pg_iobits);
	offset -= from;
	dir = pgd_offset(mm, from);
	flush_cache_range(vma, beg, end);

	while (from < end) {
		pud_t *pud = pud_alloc(mm, dir, from);
		error = -ENOMEM;
		if (!pud)
			break;
		error = io_remap_pud_range(mm, pud, from, end - from, offset + from, prot, space);
		if (error)
			break;
		from = (from + PGDIR_SIZE) & PGDIR_MASK;
		dir++;
	}

	flush_tlb_range(vma, beg, end);
	return error;
}