[Xen-devel] [PATCH 2 of 6] xen/vga: Add 'vga_delay' parameter to delay screen output by 2 second per screen output

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

# HG changeset patch
# User Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
# Date 1332608052 14400
# Node ID d097c3ba42f601af65b53a0c84973855aab64aa9
# Parent  708bf485e5d4baaf1c6272bd4fb1895a3c355d3e
xen/vga: Add 'vga_delay' parameter to delay screen output by 2 second per 
screen output.

This is useful if you find yourself on machine that has no serial console,
nor any PCI, PCIe to put in a serial card. Nothing really fancy except it allows
to capture the screenshot of the screen using a camera.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

diff -r 708bf485e5d4 -r d097c3ba42f6 xen/drivers/video/vga.c
--- a/xen/drivers/video/vga.c   Sat Mar 24 12:54:11 2012 -0400
+++ b/xen/drivers/video/vga.c   Sat Mar 24 12:54:12 2012 -0400
@@ -10,7 +10,7 @@
 #include <xen/mm.h>
 #include <xen/vga.h>
 #include <asm/io.h>
-
+#include <xen/delay.h>
 /* Filled in by arch boot code. */
 struct xen_vga_console_info vga_console_info;
 
@@ -49,6 +49,8 @@ void (*vga_puts)(const char *) = vga_noo
 static char __initdata opt_vga[30] = "";
 string_param("vga", opt_vga);
 
+static bool_t __read_mostly vga_delay;
+boolean_param("vga_delay", vga_delay);
 /* VGA text-mode definitions. */
 static unsigned int columns, lines;
 #define ATTRIBUTE   7
@@ -128,6 +130,9 @@ static void vga_text_puts(const char *s)
 
     while ( (c = *s++) != '\0' )
     {
+       if (vga_delay)
+               udelay(2000);
+
         if ( (c == '\n') || (xpos >= columns) )
         {
             if ( ++ypos >= lines )



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