Re: how to mmap 0x1f000000 to user space?

[Markus Gothe <nietzsche@xxxxxxxxxxxxxx>]

What does the vendor UM say on the memory base?

//Markus

On 24 Oct 2009, at 07:28, figo zhang wrote:

> hi,
> i am newbies for mips. i want to mmap the kernel space address
> 0x1f00,0000 to user mode space for MIPS32 CPU? how to write the mmap  
> file mothod?
> here is my code, is it right? Would you like to give me some advise?
> Thanks!
>
> static int test_reg_mmap(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;
>   unsigned int *pfn;
>   unsigned int __iomem *buf;
>   #if 0
>    offset += 0xbf000000;
>    #else
>        buf = (unsigned int  * )ioremap_nocache(0x1f000000, size);
>         pfn = vmalloc_to_pfn((void *)buf);
>   offset += pfn;
>  #endif
>       if ((offset>__pa(high_memory)) || (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_pfn_range(vma, vma->vm_start, offset, vma->vm_end-vma- 
> >vm_start,
>                vma->vm_page_prot))
>   return 0;
> }
>
>
>
> Best,
> Figo.zhang

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