[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc / prom / printf.c

/*
 * printf.c:  Internal prom library printf facility.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
 *
 * We used to warn all over the code: DO NOT USE prom_printf(),
 * and yet people do. Anton's banking code was outputting banks
 * with prom_printf for most of the 2.4 lifetime. Since an effective
 * stick is not available, we deployed a carrot: an early printk
 * through PROM by means of -p boot option. This ought to fix it.
 * USE printk; if you need, deploy -p.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include <asm/openprom.h>
#include <asm/oplib.h>

static char ppbuf[1024];

void
prom_write(const char *buf, unsigned int n)
{
	char ch;

	while (n != 0) {
		--n;
		if ((ch = *buf++) == '\n')
			prom_putchar('\r');
		prom_putchar(ch);
	}
}

void
prom_printf(char *fmt, ...)
{
	va_list args;
	int i;

	va_start(args, fmt);
	i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
	va_end(args);

	prom_write(ppbuf, i);
}
EXPORT_SYMBOL(prom_printf);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* printf.c: Internal prom library printf facility.
	3	*
	4	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
	6	*
	7	* We used to warn all over the code: DO NOT USE prom_printf(),
d1a78c32	8	* and yet people do. Anton's banking code was outputting banks
1da177e4 LT	9	* with prom_printf for most of the 2.4 lifetime. Since an effective
	10	* stick is not available, we deployed a carrot: an early printk
	11	* through PROM by means of -p boot option. This ought to fix it.
	12	* USE printk; if you need, deploy -p.
	13	*/
	14
	15	#include <linux/kernel.h>
86ac92ee	16	#include <linux/module.h>
1da177e4 LT	17
	18	#include <asm/openprom.h>
	19	#include <asm/oplib.h>
	20
	21	static char ppbuf[1024];
	22
	23	void
	24	prom_write(const char *buf, unsigned int n)
	25	{
	26	char ch;
	27
	28	while (n != 0) {
	29	--n;
	30	if ((ch = *buf++) == '\n')
	31	prom_putchar('\r');
	32	prom_putchar(ch);
	33	}
	34	}
	35
	36	void
	37	prom_printf(char *fmt, ...)
	38	{
	39	va_list args;
	40	int i;
	41
	42	va_start(args, fmt);
	43	i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
	44	va_end(args);
	45
	46	prom_write(ppbuf, i);
	47	}
86ac92ee	48	EXPORT_SYMBOL(prom_printf);