l4-hackers Digest, Vol 105, Issue 9

[sasamy]

> Is there ways that it modify <linux lcd device driver> little bit as other
> linux device drivers
>
> In other words, could Apps use allocated  memory in linux kernel?
>

Hi jangwoo.

For at91sam9g45 I replaced the function mmap in linux fb driver:

static int l4fb_mmap(struct fb_info *info,
                     struct vm_area_struct *vma)
{
        unsigned long size, offset;

        size = vma->vm_end - vma->vm_start;
        offset = vma->vm_pgoff << PAGE_SHIFT;
        if (offset + size > info->fix.smem_len)
                return -EINVAL;

        offset += info->screen_base;
                vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
        if (remap_pfn_range(vma, vma->vm_start, offset >> PAGE_SHIFT,
                            size, vma->vm_page_prot))
                return -EAGAIN;

        return 0;
}

..

static struct fb_ops atmel_lcdfb_ops = {
..
        .fb_mmap        = l4fb_mmap,
..
};

Alexander