mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 02:34:01 +08:00
28bab059a2
This patch implements low-level debug libraries with On-Chip-Debugger hardware support. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Acked-by: Arnd Bergmann <arnd@arndb.de>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
|
|
* linux/arch/unicore32/kernel/early_printk.c
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* 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 <linux/console.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <mach/ocd.h>
|
|
|
|
/* On-Chip-Debugger functions */
|
|
|
|
static void early_ocd_write(struct console *con, const char *s, unsigned n)
|
|
{
|
|
while (*s && n-- > 0) {
|
|
if (*s == '\n')
|
|
ocd_putc((int)'\r');
|
|
ocd_putc((int)*s);
|
|
s++;
|
|
}
|
|
}
|
|
|
|
static struct console early_ocd_console = {
|
|
.name = "earlyocd",
|
|
.write = early_ocd_write,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
/* Direct interface for emergencies */
|
|
static struct console *early_console = &early_ocd_console;
|
|
|
|
static int __initdata keep_early;
|
|
|
|
static int __init setup_early_printk(char *buf)
|
|
{
|
|
if (!buf)
|
|
return 0;
|
|
|
|
if (strstr(buf, "keep"))
|
|
keep_early = 1;
|
|
|
|
if (!strncmp(buf, "ocd", 3))
|
|
early_console = &early_ocd_console;
|
|
|
|
if (keep_early)
|
|
early_console->flags &= ~CON_BOOT;
|
|
else
|
|
early_console->flags |= CON_BOOT;
|
|
register_console(early_console);
|
|
return 0;
|
|
}
|
|
early_param("earlyprintk", setup_early_printk);
|