Haven't tried it, but for those interested, the cmem function for
virt->phys translation is below. Anybody familiar with Linux know if
anything's changed in recent kernels that would cause this technique to
fail? Or want to offer up a better way to do this translation?
Can anyone confirm this [mis-]behavior?
Thanks in advance!
========================================
/* Traverses the page tables and translates a virtual adress to a
physical. */
static unsigned long get_phys(unsigned long virtp)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
struct mm_struct *mm = current->mm;
pgd = pgd_offset(mm, virtp);
if (!(pgd_none(*pgd) || pgd_bad(*pgd))) {
pmd = pmd_offset(pgd, virtp);
if (!(pmd_none(*pmd) || pmd_bad(*pmd))) {
pte = pte_offset_kernel(pmd, virtp);
if (pte_present(*pte)) {
return __pa(page_address(pte_page(*pte)) +
(virtp & ~PAGE_MASK));
}
}
}
return 0;
}
========================================
Chris
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> ] On Behalf Of Peter Wippich
> Sent: Wednesday, December 06, 2006 12:08 PM
> To: davinci-linux-open-source@linux.davincidsp.com
> Subject: CMEMK and 2.6.19 Kernel
>
>
> Dear,
>
> I'm trying to use a (rebuild) cmemk with the GIT kernel. I
> can compile and
> load the module. However, when I try to start the decode demo
> I get an
> error message from cmemk that it can not map physical memory.
> It looks
> like the problem is with the virt->phyc mapping in cmemk.
> When I check
> the proc entry for cmem I get all buffer pools with physical address 0
> (right after the module load):
>
> Pool 0 has 1 buffers of size 3145728 (3145728 requested)
> Pool 0 busy buffers:
> Pool 0 free buffers:
> Buffer id 0 at physical address 0x0
>
> Pool 1 has 3 buffers of size 831488 (829440 requested)
> Pool 1 busy buffers:
> Pool 1 free buffers:
> Buffer id 0 at physical address 0x0
> Buffer id 1 at physical address 0x0
> Buffer id 2 at physical address 0x0
>
> Pool 2 has 1 buffers of size 61440 (61440 requested)
> Pool 2 busy buffers:
> Pool 2 free buffers:
> Buffer id 0 at physical address 0x0
>
> Pool 3 has 1 buffers of size 12288 (10240 requested)
> Pool 3 busy buffers:
> Pool 3 free buffers:
> Buffer id 0 at physical address 0x0
>
> Any hints ??
>
> Thank you and best regards,
>
> Peter
>
>
> | Peter Wippich Voice: +49 30
> 46776411 |
> | G&W Instruments GmbH fax: +49 30
> 46776419 |
> | Gustav-Meyer-Allee 25, Geb. 12 Email:
> [EMAIL PROTECTED] |
> | D-13355 Berlin / Germany
> |
>
> _______________________________________________
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