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47 lines
943 B
47 lines
943 B
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/early_printk.c |
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* |
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* Copyright (C) 2009 Sascha Hauer <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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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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extern void printascii(const char *); |
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static void early_write(const char *s, unsigned n) |
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{ |
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char buf[128]; |
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while (n) { |
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unsigned l = min(n, sizeof(buf)-1); |
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memcpy(buf, s, l); |
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buf[l] = 0; |
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s += l; |
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n -= l; |
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printascii(buf); |
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} |
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} |
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static void early_console_write(struct console *con, const char *s, unsigned n) |
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{ |
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early_write(s, n); |
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} |
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static struct console early_console_dev = { |
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.name = "earlycon", |
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.write = early_console_write, |
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.flags = CON_PRINTBUFFER | CON_BOOT, |
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.index = -1, |
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}; |
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static int __init setup_early_printk(char *buf) |
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{ |
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early_console = &early_console_dev; |
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register_console(&early_console_dev); |
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return 0; |
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} |
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early_param("earlyprintk", setup_early_printk);
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