mirror of https://gitee.com/openkylin/linux.git
lguest: the console driver
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>
This commit is contained in:
parent
709e89266b
commit
3f8c4d3f82
|
@ -42,6 +42,7 @@ obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o
|
|||
obj-$(CONFIG_N_HDLC) += n_hdlc.o
|
||||
obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
|
||||
obj-$(CONFIG_SX) += sx.o generic_serial.o
|
||||
obj-$(CONFIG_LGUEST_GUEST) += hvc_lguest.o
|
||||
obj-$(CONFIG_RIO) += rio/ generic_serial.o
|
||||
obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
|
||||
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
|
||||
|
|
|
@ -0,0 +1,102 @@
|
|||
/* 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);
|
Loading…
Reference in New Issue