[patch 02/20] XEN-paravirt: Add a flag to allow the VGA console to be disabled

[Jeremy Fitzhardinge]

Add a flag to allow the VGA console to be disabled.  The VGA code will
spin forever if there isn't any real VGA hardware, which will happen
under Xen.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxx>

===================================================================
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -71,6 +71,9 @@ unsigned long init_pg_tables_end __initd
 
 int disable_pse __devinitdata = 0;
 
+/* use to runtime disable vga_con */
+int vgacon_enabled = 1;
+ 
 /*
  * Machine setup..
  */
@@ -652,7 +655,7 @@ void __init setup_arch(char **cmdline_p)
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
-	if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
+	if (vgacon_enabled && (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY)))
 		conswitchp = &vga_con;
 #elif defined(CONFIG_DUMMY_CONSOLE)
 	conswitchp = &dummy_con;
===================================================================
--- a/include/asm-i386/setup.h
+++ b/include/asm-i386/setup.h
@@ -77,6 +77,8 @@ void __init add_memory_region(unsigned l
 void __init add_memory_region(unsigned long long start,
 			      unsigned long long size, int type);
 
+extern int vgacon_enabled;
+
 #endif /* __ASSEMBLY__ */
 
 #endif  /*  __KERNEL__  */

-- 

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