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/*
* printk() for use before the final page tables are setup.
*
* Copyright (C) 2012 Citrix Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/stdarg.h>
#include <xen/string.h>
#include <asm/early_printk.h>
void early_putch(char c);
void early_flush(void);
/* Early printk buffer */
static char __initdata buf[512];
static void __init early_puts(const char *s)
{
while (*s != '\0') {
if (*s == '\n')
early_putch('\r');
early_putch(*s);
s++;
}
}
static void __init early_vprintk(const char *fmt, va_list args)
{
vsnprintf(buf, sizeof(buf), fmt, args);
early_puts(buf);
/*
* Wait the UART has finished to transfer all characters before
* to continue. This will avoid lost characters if Xen abort.
*/
early_flush();
}
void __init early_printk(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
early_vprintk(fmt, args);
va_end(args);
}
void __attribute__((noreturn)) __init
early_panic(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
early_vprintk(fmt, args);
va_end(args);
early_printk("\nEarly Panic: Stopping\n");
while(1);
}
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