[Xen-devel] [PATCH 6/7] vgabios: Check if mode is currently supported as vesa specifications

[Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>]

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>
---
 tools/firmware/vgabios/vbe.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/firmware/vgabios/vbe.c b/tools/firmware/vgabios/vbe.c
index 0b8b736..a7b06b9 100644
--- a/tools/firmware/vgabios/vbe.c
+++ b/tools/firmware/vgabios/vbe.c
@@ -930,10 +930,22 @@ Bit16u *AX;Bit16u CX; Bit16u ES;Bit16u DI;
 
         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;
                 }
-- 
1.7.5.4


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