On Fri, 6 Apr 2001, C. W. Wright (1698) wrote:
> To use/access a set-aside region above linux, I put the following in the
> linux lilo.conf file:
>
> image=/boot/rtl3.0-2.2.18
> append="mem=252M"
> label=rtl2218
> read-only
> root=/dev/hda2
>
>
> Then you run lilo, and reboot. In a linux user program you then
> to set some pointer variables to the physical and virtual above-linux
> area. For example:
>
> if ((fd = open("/dev/mem", O_RDWR)) < 0) {
> perror("main() opening /dev/mem");
> return -1;
> }
>
> // Establish a pointer to the reserved memory above linux
> pram_above_linux = (void *) (LINUX_MEGS * MEGABYTE);
> vram_above_linux = (void *) ((UI32) mmap(0,
> (4 * MEGABYTE),
> PROT_WRITE | PROT_READ,
> MAP_SHARED | MAP_FILE,
> fd,
> (unsigned int) (pram_above_linux)));
This is OK. Remember to use ioremap in kernel space.
--
Tomek
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