| /* | |
| * 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/export.h> | |
| #include <linux/errno.h> | |
| #include <asm/hvcall.h> | |
| #include <asm/hvconsole.h> | |
| #include <asm/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) | |
| { | |
| long ret; | |
| unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; | |
| unsigned long *lbuf = (unsigned long *)buf; | |
| ret = plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno); | |
| lbuf[0] = be64_to_cpu(retbuf[1]); | |
| lbuf[1] = be64_to_cpu(retbuf[2]); | |
| if (ret == H_SUCCESS) | |
| return retbuf[0]; | |
| 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, | |
| cpu_to_be64(lbuf[0]), | |
| cpu_to_be64(lbuf[1])); | |
| if (ret == H_SUCCESS) | |
| return count; | |
| if (ret == H_BUSY) | |
| return -EAGAIN; | |
| return -EIO; | |
| } | |
| EXPORT_SYMBOL(hvc_put_chars); |