1 files changed, 37 insertions, 22 deletions

diff --git a/arch/ppc64/kernel/rtas.c b/arch/ppc64/kernel/rtas.c
index 43e1518653d5..5e8eb33b8e54 100644
--- a/arch/ppc64/kernel/rtas.c
+++ b/arch/ppc64/kernel/rtas.c
@@ -98,21 +98,29 @@ rtas_progress(char *s, unsigned short hex)
         int width, *p;
         char *os;
         static int display_character, set_indicator;
-        static int max_width;
+        static int display_width, display_lines, *row_width, form_feed;
         static DEFINE_SPINLOCK(progress_lock);
+        static int current_line;
         static int pending_newline = 0;  /* did last write end with unprinted newline? */
 
         if (!rtas.base)
                 return;
 
-        if (max_width == 0) {
-                if ((root = find_path_device("/rtas")) &&
-                     (p = (unsigned int *)get_property(root,
-                                                       "ibm,display-line-length",
-                                                       NULL)))
-                        max_width = *p;
-                else
-                        max_width = 0x10;
+        if (display_width == 0) {
+                display_width = 0x10;
+                if ((root = find_path_device("/rtas"))) {
+                        if ((p = (unsigned int *)get_property(root,
+                                        "ibm,display-line-length", NULL)))
+                                display_width = *p;
+                        if ((p = (unsigned int *)get_property(root,
+                                        "ibm,form-feed", NULL)))
+                                form_feed = *p;
+                        if ((p = (unsigned int *)get_property(root,
+                                        "ibm,display-number-of-lines", NULL)))
+                                display_lines = *p;
+                        row_width = (unsigned int *)get_property(root,
+                                        "ibm,display-truncation-length", NULL);
+                }
                 display_character = rtas_token("display-character");
                 set_indicator = rtas_token("set-indicator");
         }
@@ -131,31 +139,39 @@ rtas_progress(char *s, unsigned short hex)
          * it would just clear the bottom line of output. Print it now
          * instead.
          *
-         * If no newline is pending, print a CR to start output at the
-         * beginning of the line.
+         * If no newline is pending and form feed is supported, clear the
+         * display with a form feed; otherwise, print a CR to start output
+         * at the beginning of the line.
          */
         if (pending_newline) {
                 rtas_call(display_character, 1, 1, NULL, '\r');
                 rtas_call(display_character, 1, 1, NULL, '\n');
                 pending_newline = 0;
         } else {
-                rtas_call(display_character, 1, 1, NULL, '\r');
+                current_line = 0;
+                if (form_feed)
+                        rtas_call(display_character, 1, 1, NULL,
+                                  (char)form_feed);
+                else
+                        rtas_call(display_character, 1, 1, NULL, '\r');
         }
  
-        width = max_width;
+        if (row_width)
+                width = row_width[current_line];
+        else
+                width = display_width;
         os = s;
         while (*os) {
                 if (*os == '\n' || *os == '\r') {
-                        /* Blank to end of line. */
-                        while (width-- > 0)
-                                rtas_call(display_character, 1, 1, NULL, ' ');
- 
                         /* If newline is the last character, save it
                          * until next call to avoid bumping up the
                          * display output.
                          */
                         if (*os == '\n' && !os[1]) {
                                 pending_newline = 1;
+                                current_line++;
+                                if (current_line > display_lines-1)
+                                        current_line = display_lines-1;
                                 spin_unlock(&progress_lock);
                                 return;
                         }
@@ -172,7 +188,10 @@ rtas_progress(char *s, unsigned short hex)
                                 rtas_call(display_character, 1, 1, NULL, *os);
                         }
  
-                        width = max_width;
+                        if (row_width)
+                                width = row_width[current_line];
+                        else
+                                width = display_width;
                 } else {
                         width--;
                         rtas_call(display_character, 1, 1, NULL, *os);
@@ -186,10 +205,6 @@ rtas_progress(char *s, unsigned short hex)
                                 os++;
         }
  
-        /* Blank to end of line. */
-        while (width-- > 0)
-                rtas_call(display_character, 1, 1, NULL, ' ');
-
         spin_unlock(&progress_lock);
 }