[Xen-changelog] Clean up and refactor some parts of the vTPM and migration-related scripts.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 25da74e2f8fbf3664fb793c1fb9cde26a485292a
# Parent  8685b64538fa17f51d6d088935e833a4821f4f29
Reset Cirrus device model `VRAM' whenever a VGA/SVGA mode switch occurs.

If you change the video resolution on a Windows XP guest such that it uses
fewer bytes of VRAM (either by using fewer bytes per pixel or by lowering the
resolution) then some window backgrounds will become corrupted.  This happens
because the Windows XP Cirrus Logic driver assumes that VRAM is initialized
to 0xff whenever the video mode switches between VGA and SVGA.

Signed-off-by: Donald.D.Dugger@xxxxxxxxx
---
 tools/ioemu/hw/cirrus_vga.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff -r 8685b64538fa -r 25da74e2f8fb tools/ioemu/hw/cirrus_vga.c
--- a/tools/ioemu/hw/cirrus_vga.c       Wed May 10 16:01:34 2006 +0100
+++ b/tools/ioemu/hw/cirrus_vga.c       Wed May 10 16:05:24 2006 +0100
@@ -1187,6 +1187,17 @@ cirrus_hook_write_sr(CirrusVGAState * s,
        s->hw_cursor_y = (reg_value << 3) | (reg_index >> 5);
        break;
     case 0x07:                 // Extended Sequencer Mode
+       /* Win2K seems to assume that the VRAM is set to 0xff
+        *   whenever VGA/SVGA mode changes 
+        */
+       if ((s->sr[0x07] ^ reg_value) & CIRRUS_SR7_BPP_SVGA)
+           memset(s->vram_ptr, 0xff, s->real_vram_size);
+       s->sr[0x07] = reg_value;
+#ifdef DEBUG_CIRRUS 
+       printf("cirrus: handled outport sr_index %02x, sr_value %02x\n",
+              reg_index, reg_value);
+#endif
+       break;
     case 0x08:                 // EEPROM Control
     case 0x09:                 // Scratch Register 0
     case 0x0a:                 // Scratch Register 1
@@ -3021,10 +3032,6 @@ static void cirrus_init_common(CirrusVGA
     }
     s->cr[0x27] = device_id;
 
-    /* Win2K seems to assume that the pattern buffer is at 0xff
-       initially ! */
-    memset(s->vram_ptr, 0xff, s->real_vram_size);
-
     s->cirrus_hidden_dac_lockindex = 5;
     s->cirrus_hidden_dac_data = 0;
 

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