Allocating a cache-safe buffer for DMA devices and drivers
GARCIAJ at 3il.fr
Mon Aug 29 19:16:14 EST 2005
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 :
cacheDmaMalloc( ) - allocate a cache-safe buffer for DMA devices and drivers
void * cacheDmaMalloc
size_t bytes /* number of bytes to allocate */
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.
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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