| /* |
| * hvconsole.c |
| * Copyright (C) 2004 Hollis Blanchard, IBM Corporation |
| * Copyright (C) 2004 IBM Corporation |
| * |
| * Additional Author(s): |
| * Ryan S. Arnold <rsa@us.ibm.com> |
| * |
| * LPAR console support. |
| * |
| * 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/kernel.h> |
| #include <linux/module.h> |
| #include <asm/hvcall.h> |
| #include <asm/hvconsole.h> |
| #include "plpar_wrappers.h" |
| |
| /** |
| * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper |
| * @vtermno: The vtermno or unit_address of the adapter from which to fetch the |
| * data. |
| * @buf: The character buffer into which to put the character data fetched from |
| * firmware. |
| * @count: not used? |
| */ |
| int hvc_get_chars(uint32_t vtermno, char *buf, int count) |
| { |
| unsigned long got; |
| |
| if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS) |
| return got; |
| |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(hvc_get_chars); |
| |
| |
| /** |
| * hvc_put_chars: send characters to firmware for denoted vterm adapter |
| * @vtermno: The vtermno or unit_address of the adapter from which the data |
| * originated. |
| * @buf: The character buffer that contains the character data to send to |
| * firmware. |
| * @count: Send this number of characters. |
| */ |
| int hvc_put_chars(uint32_t vtermno, const char *buf, int count) |
| { |
| unsigned long *lbuf = (unsigned long *) buf; |
| long ret; |
| |
| |
| /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/ |
| if (count > MAX_VIO_PUT_CHARS) |
| count = MAX_VIO_PUT_CHARS; |
| |
| ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0], |
| lbuf[1]); |
| if (ret == H_SUCCESS) |
| return count; |
| if (ret == H_BUSY) |
| return -EAGAIN; |
| return -EIO; |
| } |
| |
| EXPORT_SYMBOL(hvc_put_chars); |