[PATCH 03/11] intoduce dmesg to print the barebox printk to dmesg ring buffer

[Sascha Hauer]

On Fri, Mar 08, 2013 at 12:59:35PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> the size can be configured vai DMESG_KFIFO_OSIZE
> 
> +int vprintk(const char *fmt, va_list args)
> +{
> +	uint i, fi;
> +	char printbuffer[CFG_PBSIZE];
> +	char *s = printbuffer;
> +	int level;
> +
> +	/* For this to work, printbuffer must be larger than
> +	 * anything we ever want to print.
> +	 */
> +	fi = i = vsprintf(printbuffer, fmt, args);
> +
> +	level = printk_get_level(printbuffer);
> +	if (level) {
> +		s += 2;
> +		fi -= 2;
> +		kfifo_putc(dmesg_output_fifo, '<');
> +		kfifo_putc(dmesg_output_fifo, level);
> +		kfifo_putc(dmesg_output_fifo, '>');
> +	}
> +
> +	/* Print the string */
> +	if (level <= printk_level + '0')
> +		puts(s);
> +
> +	kfifo_put(dmesg_output_fifo, s, fi);

When the buffer is full this drops the current message instead of the
oldest.

Sascha


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