Hi Mohit, On Tue, Jan 4, 2011 at 4:43 AM, mohit verma <mohit89mlnc@xxxxxxxxx> wrote: > hi all, > i read somewhere that there is no floating point arithmatic supported in the > kernel space . is it true?? > but the floating point registers and even floating point arithmatic units > are all handled by the.........( kernel i think). That is correct. In some architectures, attempts to use floating point from the kernel will work. I've seen some x86 code that uses it. However, with ARM for example, there is no float support in the kernel, and some ARM architectures have no floating point support in the hardware either. For ARM, there is a kernel implemented emulation of the floating point instructions, but these can only be called from user space. There are also some ARM software floating point libraries (aka soft-fp) which can be used from user space (which are much more efficient than using the kernel emulation library) The kernel also doesn't support 64-bit division using the C divide statement, unless you happen to be running on a 64-bit architecture. There are some helper functions to achieve 64-bit division (see div64.h). Dave Hylands _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
