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42 lines
732 B
42 lines
732 B
3 years ago
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/*
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* linux/kernel/printk.c
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*
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* (C) 1991 Linus Torvalds
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*/
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/*
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* When in kernel-mode, we cannot use printf, as fs is liable to
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* point to 'interesting' things. Make a printf with fs-saving, and
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* all is well.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include <linux/kernel.h>
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static char buf[1024];
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extern int vsprintf(char * buf, const char * fmt, va_list args);
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int printk(const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=vsprintf(buf,fmt,args);
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va_end(args);
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__asm__("push %%fs\n\t"
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"push %%ds\n\t"
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"pop %%fs\n\t"
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"pushl %0\n\t"
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"pushl $buf\n\t"
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"pushl $0\n\t"
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"call tty_write\n\t"
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"addl $8,%%esp\n\t"
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"popl %0\n\t"
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"pop %%fs"
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::"r" (i):"ax","cx","dx");
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return i;
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}
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