SparrowOSTS_121127.ISO

SparrowOS/Demo/Asm/AsmAndC.CPP

@@ -0,0 +1,83 @@
+/*
+This is a JIT file, not static.
+
+Asm labels can only be defined once
+in a task.  Hit F5 to spawn a new task
+and run it.
+*/
+
+asm {
+//Opcodes are slightly different to make writing my x86_64 assembler easier.
+//See $LK,"::/SparrowOS/Compiler/OpCodes.TXT.Z","FI:::/SparrowOS/Compiler/OpCodes.TXT.Z"$.
+USE64	//Defaults to 64, but this is a good habit.
+	IMPORT	Beep;
+
+_BEEPS::
+//You can clobber RAX,RBX,RCX,RDX,R8,R9 in a pure asm subroutine.
+	ENTER	0
+	MOV	RCX,U64 SF_ARG1[RBP]  //$LK,"SF_ARG1","FF:::/SparrowOS/OSMain/Adam1a.HPP.Z,SF_ARG1"$
+
+@@05:	PUSH	RCX
+//U0 Beep(I64 freq=500,Bool busy=FALSE)
+	PUSH	FALSE	//Do not busy (spin) wait
+	PUSH	500	//Hz
+	CALL	Beep
+	POP	RCX
+	LOOP	@@05
+
+	LEAVE
+//Return vals are in RAX if you have one.
+	RET1	8
+}
+
+
+//_extern binds a asm sym to a function.
+//My convention is to put an underscore
+//on C callable routines.
+_extern _BEEPS U0 Beeps(I64 cnt);
+
+I64 AsmAndC()
+{
+  I64 noreg i;	//Normally this would be stored in a reg
+		//Check with $LK,"Uf","MN:Uf"$("AsmAndC").
+
+  i=PmtI64("Num of beeps 1-5 (%d):",3,1,5);
+  Beeps(i);
+
+  asm {
+//You can clobber RAX,RBX,RCX,RDX, but preserve the rest for code in a C+ routine.
+USE64	//Defaults to 64, but this is a good habit.
+	IMPORT	Snd;
+	MOV	RCX,&i[RBP] //You can clobber RAX,RBX,RCX,RDX.
+			    //You better preserve the rest.
+
+@@05:	PUSH	RCX
+//U0 Snd(F64 freq,I64 waveform=WF_SQUARE,F64 amp=1.0);
+	MOV	RAX,1.0	//amplitude
+	PUSH	RAX
+	PUSH	WF_SQUARE
+
+	MOV	RAX,RCX	//freq=loop*100.0+100.0
+	IMUL2	RAX,100 //SparrowOS uses nonstandard opcodes
+			//to avoid multiple form of the same one.
+			//See $LK,"::/SparrowOS/Compiler/OpCodes.TXT.Z","FI:::/SparrowOS/Compiler/OpCodes.TXT.Z"$.
+			//$BK,1$Asm is kind-of a bonus -- there's no reason$BK,0$
+			//$BK,1$to use it, but I need it for the kernel.$BK,0$
+	ADD	RAX,100
+	PUSH	RAX
+	FILD	U64 [RSP]	//Convert from int to floating
+	FSTP	U64 [RSP]
+
+	CALL	Snd
+
+	MOV	RCX,0x20000000	//Simple delay loop
+@@10:	LOOP	@@10
+
+	POP	RCX
+	LOOP	@@05
+  }
+  Snd(0);
+  return i;
+}
+
+"Beeps:%d\n",AsmAndC;