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/module.h> 28 #include <asm/hvcall.h> 29 #include <asm/hvconsole.h> 30 31 /** 32 * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper 33 * @vtermno: The vtermno or unit_address of the adapter from which to fetch the 34 * data. 35 * @buf: The character buffer into which to put the character data fetched from 36 * firmware. 37 * @count: not used? 38 */ 39 int hvc_get_chars(uint32_t vtermno, char *buf, int count) 40 { 41 unsigned long got; 42 43 if (plpar_hcall(H_GET_TERM_CHAR, vtermno, 0, 0, 0, &got, 44 (unsigned long *)buf, (unsigned long *)buf+1) == H_Success) 45 return got; 46 return 0; 47 } 48 49 EXPORT_SYMBOL(hvc_get_chars); 50 51 52 /** 53 * hvc_put_chars: send characters to firmware for denoted vterm adapter 54 * @vtermno: The vtermno or unit_address of the adapter from which the data 55 * originated. 56 * @buf: The character buffer that contains the character data to send to 57 * firmware. 58 * @count: Send this number of characters. 59 */ 60 int hvc_put_chars(uint32_t vtermno, const char *buf, int count) 61 { 62 unsigned long *lbuf = (unsigned long *) buf; 63 long ret; 64 65 ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0], 66 lbuf[1]); 67 if (ret == H_Success) 68 return count; 69 if (ret == H_Busy) 70 return 0; 71 return -EIO; 72 } 73 74 EXPORT_SYMBOL(hvc_put_chars); 75