UART as MMIO device

src/devices/uart/uart.c

@@ -0,0 +1,26 @@
+#include "uart.h"
+#include "memory/memory.h"
+#include <stdio.h>
+
+#define UART_ADDRESS 0x3000000
+#define UART_REGISTER_SIZE 4
+#define UART_REGISTER_COUNT 1
+#define UART_REG_TXFIFO 0x0
+
+void uart_handle_mmio_write(uint32_t address, uint8_t value);
+uint32_t uart_handle_mmio_read(uint32_t address);
+
+void uart_init()
+{
+    mem_register_mmio(UART_ADDRESS, UART_REGISTER_SIZE, UART_REGISTER_COUNT, uart_handle_mmio_write, uart_handle_mmio_read);
+}
+
+void uart_handle_mmio_write(uint32_t address, uint8_t value)
+{
+    printf("%c", value);
+}
+
+uint32_t uart_handle_mmio_read(uint32_t address)
+{
+    return 0;
+}

src/devices/uart/uart.h

@@ -0,0 +1,6 @@
+#ifndef UART_H
+#define UART_H
+
+void uart_init();
+
+#endif

src/main.c

@@ -3,6 +3,7 @@
 #include "bootloader/bootloader.h"
 #include "cpu/rv32cpu.h"
 #include "gdbstub/gdbstub.h"
+#include "devices/uart/uart.h"
 
 char* CURRENT_NAME;
 
@@ -14,6 +15,9 @@ int main(int argc, char** argv)
 	// Initialize the memory
 	mem_init();
 
+	// Initialize UART (memory-mapped)
+	uart_init();
+
 	// Bootload the file passed as argument
 	uint32_t entry_point = bootload(file_path);