Re: Allocating a cache-safe buffer for DMA devices and drivers

[Thayumanavar Sachithanantham <thayumker@gmail.com>]

A an equivalent function that does this is pci_alloc_consistent or
dma_alloc_coherent which ensures cache coherency.
Please refer Documentation/DMA-API.txt of the linux source repository.

Thayumanavar S.

On 8/29/05, Garcia J=E9r=E9mie <GARCIAJ@3il.fr> wrote:
> Hi everybody, I have to port a vxWorks appz to Linux Montavista running o=
n a powerPC 405EP based architecture.
> In this one, we use the following vxWorks system call: cacheDmaMalloc( ) =
whose man page is :
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> NAME
>    cacheDmaMalloc( ) - allocate a cache-safe buffer for DMA devices and d=
rivers
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> SYNOPSIS
> void * cacheDmaMalloc
>    (
>    size_t bytes              /* number of bytes to allocate */
>    )
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> DESCRIPTION
>    This routine returns a pointer to a section of memory that will not ex=
perience any cache coherency problems. Function pointers in the CACHE_FUNCS=
 structure provide access to DMA support routines.
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> RETURNS
>    A pointer to the cache-safe buffer, or NULL.
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>=20
> I need to handle the given amount of memory from the user space.
> So could anyone told how to achieve the same goal on Linux with these con=
straints?
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> Tks a lot for your precious help!
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>=20
>