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
/*
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* linux/arch/unicore32/kernel/early_printk.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <mach/ocd.h>
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/* On-Chip-Debugger functions */
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static void early_ocd_write(struct console *con, const char *s, unsigned n)
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{
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while (*s && n-- > 0) {
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if (*s == '\n')
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ocd_putc((int)'\r');
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ocd_putc((int)*s);
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s++;
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}
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}
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static struct console early_ocd_console = {
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.name = "earlyocd",
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.write = early_ocd_write,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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/* Direct interface for emergencies */
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static struct console *early_console = &early_ocd_console;
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static int __initdata keep_early;
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static int __init setup_early_printk(char *buf)
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{
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if (!buf)
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return 0;
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if (strstr(buf, "keep"))
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keep_early = 1;
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if (!strncmp(buf, "ocd", 3))
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early_console = &early_ocd_console;
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if (keep_early)
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early_console->flags &= ~CON_BOOT;
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else
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early_console->flags |= CON_BOOT;
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register_console(early_console);
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return 0;
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}
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early_param("earlyprintk", setup_early_printk);
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