Introduce a symbol which can be used to prevent display modules which
need vga support being loaded into system emulators with CONFIG_VGA=n.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Message-id: 20210430113547.1816178-1-kra...@redhat.com
Message-Id: <20210430113547.1816178-16-kra...@redhat.com>
---
include/hw/display/vga.h | 6 ++++++
hw/display/vga.c | 2 ++
2 files changed, 8 insertions(+)
diff --git a/include/hw/display/vga.h b/include/hw/display/vga.h
index ca0003dbfd92..5f7825e0e368 100644
--- a/include/hw/display/vga.h
+++ b/include/hw/display/vga.h
@@ -11,6 +11,12 @@
#include "exec/hwaddr.h"
+/*
+ * modules can reference this symbol to avoid being loaded
+ * into system emulators without vga support
+ */
+extern bool have_vga;
+
enum vga_retrace_method {
VGA_RETRACE_DUMB,
VGA_RETRACE_PRECISE
diff --git a/hw/display/vga.c b/hw/display/vga.c
index 836ad50c7b6d..28a90e30d0cf 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -39,6 +39,8 @@
//#define DEBUG_VGA_MEM
//#define DEBUG_VGA_REG
+bool have_vga = true;
+
/* 16 state changes per vertical frame @60 Hz */
#define VGA_TEXT_CURSOR_PERIOD_MS (1000 * 2 * 16 / 60)
--
2.31.1
