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
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/console.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/irqflags.h>
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#include <linux/printk.h>
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#include <asm/setup.h>
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#include <hv/hypervisor.h>
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static void early_hv_write(struct console *con, const char *s, unsigned n)
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{
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tile_console_write(s, n);
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/*
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* Convert NL to NLCR (close enough to CRNL) during early boot.
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* We assume newlines are at the ends of strings, which turns out
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* to be good enough for early boot console output.
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*/
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if (n && s[n-1] == '\n')
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tile_console_write("\r", 1);
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}
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static struct console early_hv_console = {
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.name = "earlyhv",
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.write = early_hv_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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void early_panic(const char *fmt, ...)
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{
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va_list ap;
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arch_local_irq_disable_all();
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va_start(ap, fmt);
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early_printk("Kernel panic - not syncing: ");
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early_vprintk(fmt, ap);
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early_printk("\n");
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va_end(ap);
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dump_stack();
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hv_halt();
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}
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static int __init setup_early_printk(char *str)
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{
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if (early_console)
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return 1;
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early_console = &early_hv_console;
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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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