[Xen-changelog] [xen-unstable] vgabios: Check if mode is currently supported as vesa specifications

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
# Date 1336394337 -3600
# Node ID 5097d77b057b7cb4ccf6d05923a960b562a74d03
# Parent  8579bff9dc3f1aaf5543fc71d1c0f5e5c81f5222
vgabios: Check if mode is currently supported as vesa specifications

Vesa specification require that mode information return if a given
mode is supported or not so test if we can support it checking
required memory and set correctly supported bit.

Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 8579bff9dc3f -r 5097d77b057b tools/firmware/vgabios/vbe.c
--- a/tools/firmware/vgabios/vbe.c      Mon May 07 13:38:23 2012 +0100
+++ b/tools/firmware/vgabios/vbe.c      Mon May 07 13:38:57 2012 +0100
@@ -928,10 +928,22 @@ Bit16u *AX;Bit16u CX; Bit16u ES;Bit16u D
 
         if (cur_info != 0)
         {
+                Bit16u max_bpp = dispi_get_max_bpp();
+                Bit16u size_64k;
+                Bit16u totalMemory;
+
+                outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_VIDEO_MEMORY_64K);
+                totalMemory = inw(VBE_DISPI_IOPORT_DATA);
 #ifdef DEBUG
                 printf("VBE found mode %x\n",CX);
 #endif        
                 memcpyb(ss, &info, 0xc000, &(cur_info->info), 
sizeof(ModeInfoBlockCompact));
+                size_64k = size64(info.XResolution, info.YResolution, 
info.BitsPerPixel);
+                if ((info.XResolution > dispi_get_max_xres()) ||
+                    (info.BitsPerPixel > max_bpp) ||
+                    (size_64k > totalMemory))
+                  info.ModeAttributes &= ~VBE_MODE_ATTRIBUTE_SUPPORTED;
+
                 if (using_lfb) {
                   info.NumberOfBanks = 1;
                 }

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