Serial io

build.sh

@@ -2,7 +2,9 @@
 set -ex
 i686-elf-as arch/boot.s -o obj/boot.o
 i686-elf-gdc -fno-druntime -Isrc -g -c src/convert.d -o obj/convert.o
+i686-elf-gdc -fno-druntime -Isrc -g -c src/serial.d -o obj/serial.o
 i686-elf-gdc -fno-druntime -Isrc -g -c src/terminal.d -o obj/terminal.o
+i686-elf-gdc -fno-druntime -Isrc -g -c src/io.d -o obj/io.o
 i686-elf-gdc -fno-druntime -Isrc -g -c src/main.d -o obj/main.o
 i686-elf-ld -T arch/linker.ld obj/*.o -o kernel.bin
-qemu-system-i386 -kernel kernel.bin
+qemu-system-i386 -kernel kernel.bin $@

src/io.d

@@ -0,0 +1,29 @@
+module io;
+
+void outp(T)(ushort port, T d) {
+ uint data = d;
+ static if (T.sizeof == 1)
+ {
+ asm {
+ "outb %0, %1"
+ : : "a"(data),
+ "Nd"(port);
+ };
+ }
+ else static if (T.sizeof == 4)
+ {
+ asm {
+ "outw %0, %1"
+ : : "a"(data),
+ "Nd"(port);
+ };
+ }
+ else static if (T.sizeof == 4)
+ {
+ asm {
+ "outl %0, %1"
+ : : "a"(data),
+ "Nd"(port);
+ };
+ }
+}

src/main.d

@@ -1,26 +1,35 @@
 module main;
 
 import terminal;
+import serial;
 
 extern(C) void main(uint magic, uint addr) {
 
- auto terminal = Terminal(80, 25);
+ // Serial COM1
+ auto serial = SerialDevice(SerialDevice.COMPORT.COM1);
+ serial.log("Kernel image loaded successfully");
+ serial.log("Welcome to BetterNamePendingOS!");
+ serial.log("Printing int '10': ", 10);
 
- terminal.color = terminal.COLOR.GREEN;
- terminal.writeln("Terminal initialized");
- terminal.writeln("Kernel image loaded successfully");
 
- terminal.color = terminal.COLOR.WHITE;
- terminal.writeln();
- terminal.writeln("Welcome to BetterNamePendingOS!");
- terminal.writeln();
- terminal.writeln("Running tests on all availiable modules:");
- terminal.writeln();
- terminal.writeln("convert.d");
- terminal.writeln(" ", "Printing int '10': ", 10);
- terminal.writeln(" ", "Printing ubyte '0xdd': ", cast(ubyte)0xdd);
- terminal.writeln(":/");
-
- for (;;) {
- }
+ // VGA terminal
+ auto terminal = Terminal(80, 25);
+
+ terminal.color = terminal.COLOR.GREEN;
+ terminal.writeln("Terminal initialized");
+ terminal.writeln("Kernel image loaded successfully");
+
+ terminal.color = terminal.COLOR.WHITE;
+ terminal.writeln();
+ terminal.writeln("Welcome to BetterNamePendingOS!");
+ terminal.writeln();
+ terminal.writeln("Running tests on all availiable modules:");
+ terminal.writeln();
+ terminal.writeln("convert.d");
+ terminal.writeln(" ", "Printing int '10': ", 10);
+ terminal.writeln(" ", "Printing ubyte '0xdd': ", cast(ubyte)0xdd);
+ terminal.writeln(":/");
+
+ for (;;) {
+ }
 }

src/serial.d

@@ -0,0 +1,77 @@
+module serial;
+
+import io : outp;
+import convert;
+
+struct SerialDevice
+{
+public:
+ enum COMPORT : ushort
+ {
+ COM1 = 0x3f8,
+ COM2 = 0x2F8,
+ };
+
+ COMPORT port = COMPORT.COM1;
+
+ private void init() {
+ outp!ubyte(cast(ushort)(port + 1), cast(ubyte)0x00); // Disable all interrupts
+ outp!ubyte(cast(ushort)(port + 3), cast(ubyte)0x80); // Enable DLAB (set baud rate divisor)
+ outp!ubyte(cast(ushort)(port + 0), cast(ubyte)0x03); // Set divisor to 3 (lo byte) 38400 baud
+ outp!ubyte(cast(ushort)(port + 1), cast(ubyte)0x00); // (hi byte)
+ outp!ubyte(cast(ushort)(port + 3), cast(ubyte)0x03); // 8 bits, no parity, one stop bit
+ outp!ubyte(cast(ushort)(port + 2), cast(ubyte)0xC7); // Enable FIFO, clear them, with 14-byte threshold
+ outp!ubyte(cast(ushort)(port + 4), cast(ubyte)0x0B); // IRQs enabled, RTS/DSR set
+ }
+
+ this(COMPORT port)
+ {
+ this.port = port;
+ init();
+ }
+
+ void log(Args...)(Args args)
+ {
+ writeln("[LOG] ", args);
+ }
+
+ void writeln(Args...)(Args args)
+ {
+ write(args, '\r', '\n');
+ }
+
+ void write(Args...)(Args args)
+ {
+ foreach (arg; args) {
+ alias T = typeof(arg);
+ static if (is(T : const char[]))
+ {
+ putstr(arg);
+ }
+ else static if (is(T : char))
+ {
+ putchar(arg);
+ }
+ else static if (is(T : int))
+ {
+ putstr(convert.itoa(arg, 10));
+ }
+ else static if (is(T : ubyte))
+ {
+ putstr(convert.itoa(arg, 16));
+ }
+ }
+ }
+
+ private void putstr(string str)
+ {
+ foreach(c; str)
+ putchar(c);
+ }
+
+ void putchar(char c)
+ {
+ outp(this.port, c);
+ }
+}
+