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Annotation of linux/kernel/printk.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * When in kernel-mode, we cannot use printf, as fs is liable to
        !             3:  * point to 'interesting' things. Make a printf with fs-saving, and
        !             4:  * all is well.
        !             5:  */
        !             6: #include <stdarg.h>
        !             7: #include <stddef.h>
        !             8: 
        !             9: #include <linux/kernel.h>
        !            10: 
        !            11: static char buf[1024];
        !            12: 
        !            13: int printk(const char *fmt, ...)
        !            14: {
        !            15:        va_list args;
        !            16:        int i;
        !            17: 
        !            18:        va_start(args, fmt);
        !            19:        i=vsprintf(buf,fmt,args);
        !            20:        va_end(args);
        !            21:        __asm__("push %%fs\n\t"
        !            22:                "push %%ds\n\t"
        !            23:                "pop %%fs\n\t"
        !            24:                "pushl %0\n\t"
        !            25:                "pushl $_buf\n\t"
        !            26:                "pushl $0\n\t"
        !            27:                "call _tty_write\n\t"
        !            28:                "addl $8,%%esp\n\t"
        !            29:                "popl %0\n\t"
        !            30:                "pop %%fs"
        !            31:                ::"r" (i):"ax","cx","dx");
        !            32:        return i;
        !            33: }

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