[CPORTLIB][NTOS:INBV][KDCOM][FREELDR] Add ComPort library for NEC PC-98 series (...

[reactos.git] / sdk / include / reactos / drivers / pc98 / cpu.h

diff --git a/sdk/include/reactos/drivers/pc98/cpu.h b/sdk/include/reactos/drivers/pc98/cpu.h
new file mode 100644 (file)
index 0000000..d5e10a9
--- /dev/null
+++ b/sdk/include/reactos/drivers/pc98/cpu.h
@@ -0,0 +1,28 @@
+/*
+ * PROJECT:     NEC PC-98 series onboard hardware
+ * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
+ * PURPOSE:     CPU I/O ports header file
+ * COPYRIGHT:   Copyright 2020 Dmitry Borisov (di.sean@protonmail.com)
+ */
+
+#pragma once
+
+#define CPU_IO_o_RESET          0x0F
+#define CPU_IO_o_A20_UNMASK     0xF2
+
+#define CPU_IO_o_A20_CONTROL    0xF6
+    #define CPU_A20_ENABLE          0x02
+    #define CPU_A20_DISABLE         0x03
+
+/*
+ * ARTIC (A Relative Time Indication Counter) - 24-bit binary up counter
+ */
+#define CPU_IO_o_ARTIC_DELAY    0x5F /* Constant delay (about 600 ns) */
+#define CPU_IO_i_ARTIC_0        0x5C
+#define CPU_IO_i_ARTIC_1        0x5D
+#define CPU_IO_i_ARTIC_2        0x5E
+#define CPU_IO_i_ARTIC_3        0x5F
+
+#define ARTIC_FREQUENCY        307200
+#define ARTIC_FREQUENCY_0_1    ARTIC_FREQUENCY
+#define ARTIC_FREQUENCY_2_3    (ARTIC_FREQUENCY >> 8)