arch/mips/dec/prom/console.c

Source file repositories/reference/linux-study-clean/arch/mips/dec/prom/console.c

File Facts

System
Linux kernel
Corpus path
arch/mips/dec/prom/console.c
Extension
.c
Size
909 bytes
Lines
45
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	DECstation PROM-based early console support.
 *
 *	Copyright (C) 2004, 2007, 2026  Maciej W. Rozycki
 */
#include <linux/bug.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>

#include <asm/dec/prom.h>

static void __init prom_console_write(struct console *con, const char *s,
				      unsigned int c)
{
	static char buf[81] __initdata = { 0 };
	unsigned int chunk = sizeof(buf) - 1;

	BUG_ON((long)buf != (int)(long)buf);

	while (c > 0) {
		if (chunk > c)
			chunk = c;
		memcpy(buf, s, chunk);
		buf[chunk] = '\0';
		prom_printf("%s", buf);
		s += chunk;
		c -= chunk;
	}
}

static struct console promcons __initdata = {
	.name	= "prom",
	.write	= prom_console_write,
	.flags	= CON_BOOT | CON_PRINTBUFFER,
	.index	= -1,
};

void __init register_prom_console(void)
{
	register_console(&promcons);
}

Annotation

Implementation Notes