mfpi test

tests/mfpi.mac

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+; make sure current run-mode is kernel and previous is user
+	MOV	#0177776,R0
+	MOV	#030000,(R0)
+	NOP
+
+; initialize kernel- and user stackpointers
+; kernel
+	MOV	#1000,R6
+;; user
+;	MOV	#0177717,R0
+;	MOV	#1000,(R0)
+
+; user: 060000-080000 will be mapped to physical address 020000
+	MOV	#0177646,R0
+; 020000 / 0100 (0100 => 64 decimal)
+	MOV	#0200,(R0)
+	NOP
+
+; user: make sure write- and read-access is possible
+	MOV	#0177606,R0
+	MOV	#077406,(R0)
+
+; kernel: flat mapping
+; 0-010000 -> 0
+	MOV	#0172340,R0
+	MOV	#0000,(R0)
+; 060000-0100000 -> 060000
+	MOV	#0172346,R0
+	MOV	#0600,(R0)
+	NOP
+
+; kernel: make sure write- and read-access is possible
+; 0-010000
+	MOV	#0172300,R0
+	MOV	#077406,(R0)
+; 060000-0100000
+	MOV	#0172306,R0
+	MOV	#077406,(R0)
+
+; place a value at 020000 kernelspace which is
+; 060000 in userspace
+	MOV	#020000,R0
+	MOV	#01234,(R0)
+
+; MRR0
+	MOV	#0177572,R0
+; enable MMU traps
+	BIS	#512,(R0)
+; enable MMU
+	BIS	#1,(R0)
+
+; get word from 060000 in userspace and put that on
+; the kernel stack
+	MOV	#060000,R0
+	MFPI	(R0)
+	NOP
+
+; check for 01234
+	MOV	(SP)+,R0
+	CMP	#01234,R0
+	NOP
+
+	HALT
+
+	make_raw