This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / platforms / pseries / hvconsole.c

diff --git a/arch/powerpc/platforms/pseries/hvconsole.c b/arch/powerpc/platforms/pseries/hvconsole.c
new file mode 100644 (file)
index 0000000..a72a987
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/hvconsole.c
@@ -0,0 +1,79 @@
+/*
+ * 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;
+
+
+       /* 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 0;
+       return -EIO;
+}
+
+EXPORT_SYMBOL(hvc_put_chars);