%fs is a segment register. More details, see http://en.wikipedia.org/wiki/X86_assembly_language , section "Registers", "Segmented addressing". On Thu, May 9, 2013 at 6:04 PM, lx <lxlenovostar@xxxxxxxxx> wrote: > hi all: > the codes is: > > extern inline unsigned char get_fs_byte(const char * addr) > { > unsigned register char _v; > > __asm__ ("movb %%fs:%1,%0":"=r" (_v):"m" (*addr)); > return _v; > } > > What's the meaning of "%%fs" ? > > Is " __asm__ ("movb %1,%0":"=r" (_v):"m" (*addr));" not ok? > > > Thank you. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
