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Annotation of linux/kernel/printk.c, revision 1.1.1.2

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: 
1.1.1.2 ! root       11: extern int vsprintf();
1.1       root       12: static char buf[1024];
                     13: 
                     14: int printk(const char *fmt, ...)
                     15: {
                     16:        va_list args;
                     17:        int i;
                     18: 
                     19:        va_start(args, fmt);
                     20:        i=vsprintf(buf,fmt,args);
                     21:        va_end(args);
                     22:        __asm__("push %%fs\n\t"
                     23:                "push %%ds\n\t"
                     24:                "pop %%fs\n\t"
                     25:                "pushl %0\n\t"
1.1.1.2 ! root       26:                "pushl $buf\n\t"
1.1       root       27:                "pushl $0\n\t"
1.1.1.2 ! root       28:                "call tty_write\n\t"
1.1       root       29:                "addl $8,%%esp\n\t"
                     30:                "popl %0\n\t"
                     31:                "pop %%fs"
                     32:                ::"r" (i):"ax","cx","dx");
                     33:        return i;
                     34: }

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