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-rw-r--r--drivers/3dfx.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/3dfx.h b/drivers/3dfx.h
index cc23cfdaae..f784f7d34c 100644
--- a/drivers/3dfx.h
+++ b/drivers/3dfx.h
@@ -316,7 +316,7 @@ typedef struct voodoo_yuv_fb_t voodoo_yuv_fb;
#define TDFXF_HSYNC_MASK 0x03
#define TDFXF_VSYNC_MASK 0x0c
-#define XYREG(x,y) (((y) << 16) | (x))
+#define XYREG(x,y) (((((unsigned long)y) & 0xFFFF) << 16) | (((unsigned long)x) & 0xFFFF))
//#define TDFXFB_DEBUG
#ifdef TDFXFB_DEBUG