1 files changed, 135 insertions, 0 deletions
diff --git a/arch/x86/include/asm/acpi/debug.asl b/arch/x86/include/asm/acpi/debug.asl
new file mode 100644
index 0000000..6025507
--- /dev/null
+++ b/arch/x86/include/asm/acpi/debug.asl
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ * Copyright (C) 2016 Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Modified from coreboot src/arch/x86/acpi/debug.asl
+ */
+
+/* POST register region */
+OperationRegion(X80, SystemIO, 0x80, 1)
+Field(X80, ByteAcc, NoLock, Preserve)
+{
+	P80, 8
+}
+
+/* Legacy serial port register region */
+OperationRegion(CREG, SystemIO, 0x3F8, 8)
+Field(CREG, ByteAcc, NoLock, Preserve)
+{
+	CDAT, 8,
+	CDLM, 8,
+	    , 8,
+	CLCR, 8,
+	CMCR, 8,
+	CLSR, 8
+}
+
+/* DINI - Initialize the serial port to 115200 8-N-1 */
+Method(DINI)
+{
+	Store(0x83, CLCR)
+	Store(0x01, CDAT)	/* 115200 baud (low) */
+	Store(0x00, CDLM)	/* 115200 baud (high) */
+	Store(0x03, CLCR)	/* word=8 stop=1 parity=none */
+	Store(0x03, CMCR)	/* DTR=1 RTS=1 out1/2=Off loop=Off */
+	Store(0x00, CDLM)	/* turn off interrupts */
+}
+
+/* THRE - Wait for serial port transmitter holding register to go empty */
+Method(THRE)
+{
+	And(CLSR, 0x20, Local0)
+	While (LEqual(Local0, Zero)) {
+		And(CLSR, 0x20, Local0)
+	}
+}
+
+/* OUTX - Send a single raw character */
+Method(OUTX, 1)
+{
+	THRE()
+	Store(Arg0, CDAT)
+}
+
+/* OUTC - Send a single character, expanding LF into CR/LF */
+Method(OUTC, 1)
+{
+	If (LEqual(Arg0, 0x0a)) {
+		OUTX(0x0d)
+	}
+	OUTX(Arg0)
+}
+
+/* DBGN - Send a single hex nibble */
+Method(DBGN, 1)
+{
+	And(Arg0, 0x0f, Local0)
+	If (LLess(Local0, 10)) {
+		Add(Local0, 0x30, Local0)
+	} Else {
+		Add(Local0, 0x37, Local0)
+	}
+	OUTC(Local0)
+}
+
+/* DBGB - Send a hex byte */
+Method(DBGB, 1)
+{
+	ShiftRight(Arg0, 4, Local0)
+	DBGN(Local0)
+	DBGN(Arg0)
+}
+
+/* DBGW - Send a hex word */
+Method(DBGW, 1)
+{
+	ShiftRight(Arg0, 8, Local0)
+	DBGB(Local0)
+	DBGB(Arg0)
+}
+
+/* DBGD - Send a hex dword */
+Method(DBGD, 1)
+{
+	ShiftRight(Arg0, 16, Local0)
+	DBGW(Local0)
+	DBGW(Arg0)
+}
+
+/* Get a char from a string */
+Method(GETC, 2)
+{
+	CreateByteField(Arg0, Arg1, DBGC)
+	Return (DBGC)
+}
+
+/* DBGO - Send either a string or an integer */
+Method(DBGO, 1, Serialized)
+{
+	If (LEqual(ObjectType(Arg0), 1)) {
+		If (LGreater(Arg0, 0xffff)) {
+			DBGD(Arg0)
+		} Else {
+			If (LGreater(Arg0, 0xff)) {
+				DBGW(Arg0)
+			} Else {
+				DBGB(Arg0)
+			}
+		}
+	} Else {
+		Name(BDBG, Buffer(80) {})
+		Store(Arg0, BDBG)
+		Store(0, Local1)
+		While (One) {
+			Store(GETC(BDBG, Local1), Local0)
+			If (LEqual(Local0, 0)) {
+				Return (Zero)
+			}
+			OUTC(Local0)
+			Increment(Local1)
+		}
+	}
+
+	Return (Zero)
+}