[okl4-developer] Iguana memsections

[Geoffrey Lee]

On Wed, Jul 16, 2008 at 12:34:19PM +0200, Guillaume PETITJEAN wrote:
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> My understanding is that, in order to access a memsection, I need to
> call the following funtions:
> 1) memsection_create()
> 2) memsection_map(memsection_ref_t memsect, uintptr_t offset,
> physmem_ref_t phys)
> 
> For 2) i don't understand why I should provide the phys addr. The
> application should not be manipulating phys addr right ?

Hi Guillaume

memsection_create() will create a memesection which backs it
with physical memory.  You can can also create a memsection
that be manually mapped with memsection_create_user().  The
memsection_map() API is supposed to allow you to map memory
into user-mapped memory sections.  The physmem reference can be
created with physpool_alloc(), and information can be obtained
from the physpool with physmem_info().  libs/iguana/test/memsect_tests.c 
contain some tests which contain some examples on how to use this API.



	-gl

> 
> Could you explain the exact behaviour of these functions and how I
> should compute the phys addr ?
> 
> Guillaume
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