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#include "plpar_wrappers.h" 31 32/** 33 * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper 34 * @vtermno: The vtermno or unit_address of the adapter from which to fetch the 35 * data. 36 * @buf: The character buffer into which to put the character data fetched from 37 * firmware. 38 * @count: not used? 39 */ 40int hvc_get_chars(uint32_t vtermno, char *buf, int count) 41{ 42 unsigned long got; 43 44 if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS) 45 return got; 46 47 return 0; 48} 49 50EXPORT_SYMBOL(hvc_get_chars); 51 52 53/** 54 * hvc_put_chars: send characters to firmware for denoted vterm adapter 55 * @vtermno: The vtermno or unit_address of the adapter from which the data 56 * originated. 57 * @buf: The character buffer that contains the character data to send to 58 * firmware. 59 * @count: Send this number of characters. 60 */ 61int hvc_put_chars(uint32_t vtermno, const char *buf, int count) 62{ 63 unsigned long *lbuf = (unsigned long *) buf; 64 long ret; 65 66 67 /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/ 68 if (count > MAX_VIO_PUT_CHARS) 69 count = MAX_VIO_PUT_CHARS; 70 71 ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0], 72 lbuf[1]); 73 if (ret == H_SUCCESS) 74 return count; 75 if (ret == H_BUSY) 76 return 0; 77 return -EIO; 78} 79 80EXPORT_SYMBOL(hvc_put_chars); 81