On Fri, 21 Apr 2000, Zhixu Liu wrote:
> I have a question about the share memory use mmap. (in rtlinux-2.2)
> I use the example in mmap, but what i want to know is is there is a
mmap is for user space. Use ioremap in the kernel.
> limit of the size of share memory, for when i try to map a region
> about 1000 int, in the kernel module the computer always dead.
>
> Following is the program i use.
>
> ===================================
> #include <rtl.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/mman.h>
Did you compile it with -D__KERNEL__ etc. ? You should not include things
like unistd.h or fcntl.h or sys/mman.h in kernel space. They are unusable
there anyway.
> int fd = open("/dev/mem", O_RDWR);
I do not think it is supported in the kernel.
> start = (int *)mmap(0,length*sizeof(int),PROT_READ|PROT_WRITE,
> MAP_SHARED,fd,BASE_ADDRESS);
Just use ioremap instead.
--
Tomek
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