mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-26 19:36:41 +00:00
3f8c4d3f82
A simple console driver for lguest. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/* Simple console for lguest.
|
|
*
|
|
* Copyright (C) 2006 Rusty Russell, IBM Corporation
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/lguest_bus.h>
|
|
#include "hvc_console.h"
|
|
|
|
static char inbuf[256];
|
|
static struct lguest_dma cons_input = { .used_len = 0,
|
|
.addr[0] = __pa(inbuf),
|
|
.len[0] = sizeof(inbuf),
|
|
.len[1] = 0 };
|
|
|
|
static int put_chars(u32 vtermno, const char *buf, int count)
|
|
{
|
|
struct lguest_dma dma;
|
|
|
|
/* FIXME: what if it's over a page boundary? */
|
|
dma.len[0] = count;
|
|
dma.len[1] = 0;
|
|
dma.addr[0] = __pa(buf);
|
|
|
|
lguest_send_dma(LGUEST_CONSOLE_DMA_KEY, &dma);
|
|
return count;
|
|
}
|
|
|
|
static int get_chars(u32 vtermno, char *buf, int count)
|
|
{
|
|
static int cons_offset;
|
|
|
|
if (!cons_input.used_len)
|
|
return 0;
|
|
|
|
if (cons_input.used_len - cons_offset < count)
|
|
count = cons_input.used_len - cons_offset;
|
|
|
|
memcpy(buf, inbuf + cons_offset, count);
|
|
cons_offset += count;
|
|
if (cons_offset == cons_input.used_len) {
|
|
cons_offset = 0;
|
|
cons_input.used_len = 0;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static struct hv_ops lguest_cons = {
|
|
.get_chars = get_chars,
|
|
.put_chars = put_chars,
|
|
};
|
|
|
|
static int __init cons_init(void)
|
|
{
|
|
if (strcmp(paravirt_ops.name, "lguest") != 0)
|
|
return 0;
|
|
|
|
return hvc_instantiate(0, 0, &lguest_cons);
|
|
}
|
|
console_initcall(cons_init);
|
|
|
|
static int lguestcons_probe(struct lguest_device *lgdev)
|
|
{
|
|
int err;
|
|
|
|
lgdev->private = hvc_alloc(0, lgdev_irq(lgdev), &lguest_cons, 256);
|
|
if (IS_ERR(lgdev->private))
|
|
return PTR_ERR(lgdev->private);
|
|
|
|
err = lguest_bind_dma(LGUEST_CONSOLE_DMA_KEY, &cons_input, 1,
|
|
lgdev_irq(lgdev));
|
|
if (err)
|
|
printk("lguest console: failed to bind buffer.\n");
|
|
return err;
|
|
}
|
|
|
|
static struct lguest_driver lguestcons_drv = {
|
|
.name = "lguestcons",
|
|
.owner = THIS_MODULE,
|
|
.device_type = LGUEST_DEVICE_T_CONSOLE,
|
|
.probe = lguestcons_probe,
|
|
};
|
|
|
|
static int __init hvc_lguest_init(void)
|
|
{
|
|
return register_lguest_driver(&lguestcons_drv);
|
|
}
|
|
module_init(hvc_lguest_init);
|