x86 setup: display VESA graphics modes in vga=ask menu

Display VESA graphics modes, with their mode IDs, in the vga=ask
menu.  Most VESA mode numbers are platform-dependent, so it helps to
have an easy way to display them.

Based in part on a patch by Petr Vandrovec <petr@vandrovec.name>.

Cc: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 30 insertions, 3 deletions

diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c
index ad9712f01739..696d08f3843c 100644
--- a/arch/x86/boot/video.c
+++ b/arch/x86/boot/video.c
@@ -293,13 +293,28 @@ static void display_menu(void)
         struct mode_info *mi;
         char ch;
         int i;
+        int nmodes;
+        int modes_per_line;
+        int col;
 
-        puts("Mode:    COLSxROWS:\n");
+        nmodes = 0;
+        for (card = video_cards; card < video_cards_end; card++)
+                nmodes += card->nmodes;
 
+        modes_per_line = 1;
+        if (nmodes >= 20)
+                modes_per_line = 3;
+
+        for (col = 0; col < modes_per_line; col++)
+                puts("Mode: Resolution:  Type: ");
+        putchar('\n');
+
+        col = 0;
         ch = '0';
         for (card = video_cards; card < video_cards_end; card++) {
                 mi = card->modes;
                 for (i = 0; i < card->nmodes; i++, mi++) {
+                        char resbuf[32];
                         int visible = mi->x && mi->y;
                         u16 mode_id = mi->mode ? mi->mode :
                                 (mi->y << 8)+mi->x;
@@ -307,8 +322,18 @@ static void display_menu(void)
                         if (!visible)
                                 continue; /* Hidden mode */
 
-                        printf("%c  %04X  %3dx%-3d  %s\n",
-                               ch, mode_id, mi->x, mi->y, card->card_name);
+                        if (mi->depth)
+                                sprintf(resbuf, "%dx%d", mi->y, mi->depth);
+                        else
+                                sprintf(resbuf, "%d", mi->y);
+
+                        printf("%c %03X %4dx%-7s %-6s",
+                               ch, mode_id, mi->x, resbuf, card->card_name);
+                        col++;
+                        if (col >= modes_per_line) {
+                                putchar('\n');
+                                col = 0;
+                        }
 
                         if (ch == '9')
                                 ch = 'a';
@@ -318,6 +343,8 @@ static void display_menu(void)
                                 ch++;
                 }
         }
+        if (col)
+                putchar('\n');
 }
 
 #define H(x)    ((x)-'a'+10)