init repo

lab1/csrc/mmio.h

@@ -0,0 +1,23 @@
+// Copyright 2021 Howard Lau
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#define VRAM_BASE 0x20000000
+#define VRAM ((volatile unsigned char *) VRAM_BASE)
+#define TIMER_BASE 0x80000000
+#define TIMER_LIMIT ((volatile unsigned int *) (TIMER_BASE + 4))
+#define TIMER_ENABLED ((volatile unsigned int *) (TIMER_BASE + 8))
+#define UART_BASE 0x40000000
+#define UART_BAUDRATE ((volatile unsigned int *) (UART_BASE + 4))
+#define UART_RECV ((volatile unsigned int *) (UART_BASE + 12))
+#define UART_SEND ((volatile unsigned int *) (UART_BASE + 16))