/* * When in kernel-mode, we cannot use printf, as fs is liable to * point to 'interesting' things. Make a printf with fs-saving, and * all is well. */ #include #include #include static char buf[1024]; int printk(const char *fmt, ...) { va_list args; int i; va_start(args, fmt); i=vsprintf(buf,fmt,args); va_end(args); __asm__("push %%fs\n\t" "push %%ds\n\t" "pop %%fs\n\t" "pushl %0\n\t" "pushl $_buf\n\t" "pushl $0\n\t" "call _tty_write\n\t" "addl $8,%%esp\n\t" "popl %0\n\t" "pop %%fs" ::"r" (i):"ax","cx","dx"); return i; }