diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/hvconsole.c')
-rw-r--r-- | arch/powerpc/platforms/pseries/hvconsole.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hvconsole.c b/arch/powerpc/platforms/pseries/hvconsole.c new file mode 100644 index 00000000000..138e128a388 --- /dev/null +++ b/arch/powerpc/platforms/pseries/hvconsole.c @@ -0,0 +1,74 @@ +/* + * 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> + +/** + * 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_hcall(H_GET_TERM_CHAR, vtermno, 0, 0, 0, &got, + (unsigned long *)buf, (unsigned long *)buf+1) == 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; + + 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 0; + return -EIO; +} + +EXPORT_SYMBOL(hvc_put_chars); |