1 /*
2 * hvconsole.c
3 * Copyright (C) 2004 Hollis Blanchard, IBM Corporation
4 * Copyright (C) 2004 IBM Corporation
5 *
6 * Additional Author(s):
7 * Ryan S. Arnold <rsa@us.ibm.com>
8 *
9 * LPAR console support.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/export.h>
28 #include <linux/errno.h>
29 #include <asm/hvcall.h>
30 #include <asm/hvconsole.h>
31 #include "plpar_wrappers.h"
32
33 /**
34 * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
35 * @vtermno: The vtermno or unit_address of the adapter from which to fetch the
36 * data.
37 * @buf: The character buffer into which to put the character data fetched from
38 * firmware.
39 * @count: not used?
40 */
hvc_get_chars(uint32_t vtermno,char * buf,int count)41 int hvc_get_chars(uint32_t vtermno, char *buf, int count)
42 {
43 unsigned long got;
44
45 if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS)
46 return got;
47
48 return 0;
49 }
50
51 EXPORT_SYMBOL(hvc_get_chars);
52
53
54 /**
55 * hvc_put_chars: send characters to firmware for denoted vterm adapter
56 * @vtermno: The vtermno or unit_address of the adapter from which the data
57 * originated.
58 * @buf: The character buffer that contains the character data to send to
59 * firmware.
60 * @count: Send this number of characters.
61 */
hvc_put_chars(uint32_t vtermno,const char * buf,int count)62 int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
63 {
64 unsigned long *lbuf = (unsigned long *) buf;
65 long ret;
66
67
68 /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
69 if (count > MAX_VIO_PUT_CHARS)
70 count = MAX_VIO_PUT_CHARS;
71
72 ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
73 lbuf[1]);
74 if (ret == H_SUCCESS)
75 return count;
76 if (ret == H_BUSY)
77 return -EAGAIN;
78 return -EIO;
79 }
80
81 EXPORT_SYMBOL(hvc_put_chars);
82