mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 15:41:58 +00:00
bda0f5bad8
This change improves and cleans up the tile console. - We enable HVC_IRQ support on tilegx, with the addition of a new Tilera hypervisor API for tilegx to allow a console IPI. If IPI support is not available we fall back to the previous polling mode. - We simplify the earlyprintk code to use CON_BOOT and eliminate some of the other supporting earlyprintk code. - A new tile_console_write() primitive is used to send output to the console and is factored out of the hvc_tile driver. This lets us support a "sim_console" boot argument to allow using simulator hooks to send output to the "console" as a slightly faster alternative to emulating the hardware more directly. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/console.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/irqflags.h>
|
|
#include <linux/printk.h>
|
|
#include <asm/setup.h>
|
|
#include <hv/hypervisor.h>
|
|
|
|
static void early_hv_write(struct console *con, const char *s, unsigned n)
|
|
{
|
|
tile_console_write(s, n);
|
|
|
|
/*
|
|
* Convert NL to NLCR (close enough to CRNL) during early boot.
|
|
* We assume newlines are at the ends of strings, which turns out
|
|
* to be good enough for early boot console output.
|
|
*/
|
|
if (n && s[n-1] == '\n')
|
|
tile_console_write("\r", 1);
|
|
}
|
|
|
|
static struct console early_hv_console = {
|
|
.name = "earlyhv",
|
|
.write = early_hv_write,
|
|
.flags = CON_PRINTBUFFER | CON_BOOT,
|
|
.index = -1,
|
|
};
|
|
|
|
void early_panic(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
arch_local_irq_disable_all();
|
|
va_start(ap, fmt);
|
|
early_printk("Kernel panic - not syncing: ");
|
|
early_vprintk(fmt, ap);
|
|
early_printk("\n");
|
|
va_end(ap);
|
|
dump_stack();
|
|
hv_halt();
|
|
}
|
|
|
|
static int __init setup_early_printk(char *str)
|
|
{
|
|
if (early_console)
|
|
return 1;
|
|
|
|
early_console = &early_hv_console;
|
|
register_console(early_console);
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("earlyprintk", setup_early_printk);
|