On 10/30/06, Franck Bui-Huu <[email protected]> wrote:
Andrew,
Andrew Morton wrote:
> On Thu, 26 Oct 2006 17:48:58 +0000
> Miguel Ojeda Sandonis <[email protected]> wrote:
>
[snip]
>
>> +struct page *cfag12864bfb_vma_nopage(struct vm_area_struct *vma,
>> + unsigned long address, int *type)
>
> This function can have static scope.
>
>> +{
>> + struct page *page;
>> + down(&cfag12864bfb_sem);
>> +
>> + page = virt_to_page(cfag12864b_buffer);
>> + get_page(page);
>> +
>> + if(type)
>> + *type = VM_FAULT_MINOR;
>> +
>> + up(&cfag12864bfb_sem);
>> + return page;
>> +}
>
Any idea why LDD3 states:
An interesting limitation of remap_pfn_range is that it gives
access only to reserved pages and physical addresses above the
top of physical memory.
Is that true we can't do:
buf = (char *)__get_free_page(...);
pfn = PFN_DOWN(virt_to_phys(buf));
remap_pfn_range(vma, vma->vm_start, pfn, PAGE_SIZE, vma->vm_page_prot);
Thanks
Franck
Again: Please read LDD3. It explains it well. Read all the "Remapping
RAM" chapter and you will understand what I've done, or just try to
remap RAM yourself with remap_pfn_range. (I really tried it using
different ways and I couldn't map it with remap_pfn_range, it returns
you a place full with zeros, as LDD3 states).
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