static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
/*
* Accessing memory above the top the kernel knows about or
* through a file pointer that was marked O_SYNC will be
* done non-cached.
*/
if (noncached_address(offset) || (file->f_flags & O_SYNC))
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Don't try to swap out physical pages.. */
vma->vm_flags |= VM_RESERVED;
/*
* Don't dump addresses that are not real memory to a core file.
*/
if (offset >= __pa(high_memory) || (file->f_flags & O_SYNC))
vma->vm_flags |= VM_IO;
if (remap_page_range(vma->vm_start, offset, vma->vm_end-vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
return 0;
}
static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
{
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long size = vma->vm_end - vma->vm_start;
/*
* If the user is not attempting to mmap a high memory address then
* the standard mmap_mem mechanism will work. High memory addresses
* need special handling, as remap_page_range expects a physically-
* contiguous range of kernel addresses (such as obtained in kmalloc).
*/
if ((offset + size) < (unsigned long) high_memory)
return mmap_mem(file, vma);
/*
* Accessing memory above the top the kernel knows about or
* through a file pointer that was marked O_SYNC will be
* done non-cached.
*/
if (noncached_address(offset) || (file->f_flags & O_SYNC))
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Don't do anything here; "nopage" will fill the holes */
vma->vm_ops = &kmem_vm_ops;
/* Don't try to swap out physical pages.. */
vma->vm_flags |= VM_RESERVED;
/*
* Don't dump addresses that are not real memory to a core file.
*/
vma->vm_flags |= VM_IO;
return 0;
}
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
#ifndef NO_MM
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
/*
* Accessing memory above the top the kernel knows about or
* through a file pointer that was marked O_SYNC will be
* done non-cached.
*/
if (noncached_address(offset) || (file->f_flags & O_SYNC))
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Don't try to swap out physical pages.. */
vma->vm_flags |= VM_RESERVED;
/*
* Don't dump addresses that are not real memory to a core file.
*/
if (offset >= __pa(high_memory) || (file->f_flags & O_SYNC))
vma->vm_flags |= VM_IO;
if (remap_page_range(vma->vm_start, offset, vma->vm_end-vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
return 0;
#else /* !NO_MM */
/* Return the physical address unmodified if it's possible to do
so given the arguments. */
if (vma->vm_start == file->f_pos + vma->vm_offset)
return 0;
else
return -EINVAL;
#endif /* !NO_MM */
}
