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

From: Thayumanavar Sachithanantham <[email-masked]>
Date: Mon, 29 Aug 2005 15:00:06 +0530

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 Jérémie <[email-masked]> wrote:
> Hi everybody, I have to port a vxWorks appz to Linux Montavista running on a powerPC 405EP based architecture.
> In this one, we use the following vxWorks system call: cacheDmaMalloc( ) whose man page is :
> 
> NAME
>    cacheDmaMalloc( ) - allocate a cache-safe buffer for DMA devices and drivers
> 
> SYNOPSIS
> void * cacheDmaMalloc
>    (
>    size_t bytes              /* number of bytes to allocate */
>    )
> 
> DESCRIPTION
>    This routine returns a pointer to a section of memory that will not experience any cache coherency problems. Function pointers in the CACHE_FUNCS structure provide access to DMA support routines.
> 
> RETURNS
>    A pointer to the cache-safe buffer, or NULL.
> 
> 
> 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 constraints?
> 
> Tks a lot for your precious help!
> 
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