- added vbe_has_vbe_display function that detects an attached vbe display

2 files changed, 12 insertions, 1 deletions

diff --git a/vbe.c b/vbe.c
index 097e7c1..4acb259 100644
--- a/vbe.c
+++ b/vbe.c
@@ -127,6 +127,16 @@ MACRO HALT
 MEND
 #endasm
 
+/** Has VBE display - Returns true if VBE display detected
+ *
+ */
+Boolean vbe_has_vbe_display()
+{
+  outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ID);
+  outw(VBE_DISPI_IOPORT_DATA,VBE_DISPI_ID0);
+
+  return (inw(VBE_DISPI_IOPORT_DATA)==VBE_DISPI_ID0);
+}
 
 /** VBE Init - Initialise the Vesa Bios Extension Code
  *
diff --git a/vbe.h b/vbe.h
index e8e6cc9..8bde321 100644
--- a/vbe.h
+++ b/vbe.h
@@ -7,6 +7,7 @@
  *
  *  See the function descriptions in vbe.c for more information
  */
+Boolean vbe_has_vbe_display();
 void vbe_init();
 void vbe_display_info();
 void vbe_biosfn_return_controller_information(AX, ES, DI);
@@ -293,4 +294,4 @@ typedef struct ModeInfoBlock
   
   #define VBE_DISPI_LFB_PHYSICAL_ADDRESS  0xE0000000
 
-#endif
\ No newline at end of file
+#endif