minor performance improvements, optional mouse, mouse cursor now drawn

[dosdemo] / src / util.h

diff --git a/src/util.h b/src/util.h
index ce43bbe..b305d78 100644 (file)
--- a/src/util.h
+++ b/src/util.h
@@ -52,6 +52,11 @@ void debug_break(void);
 
 void halt(void);
 #pragma aux halt = "hlt";
+
+void memset16(void *ptr, int val, int count);
+#pragma aux memset16 = \
+       "rep stosw" \
+       parm[edi][eax][ecx];
 #endif
 
 #ifdef __GNUC__
@@ -78,6 +83,10 @@ void halt(void);
 
 #define halt() \
        asm volatile("hlt")
+
+#define memset16(ptr, val, count) asm volatile ( \
+       "rep stosw\n\t" \
+       :: "D"(ptr), "a"(val), "c"(count))
 #endif
 
 #ifdef _MSC_VER
@@ -106,6 +115,16 @@ void halt(void);
        do { \
                __asm { int 3 } \
        } while(0)
+
+#define memset16(ptr, val, count) \
+       do { \
+               __asm { \
+                       mov edi, ptr \
+                       mov ecx, count \
+                       mov eax, val \
+                       rep stosw \
+               } \
+       } while(0)
 #endif
 
 #endif /* UTIL_H_ */