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//! Serial port driver (COM1)
const int = @import("../../utils/types/int.zig");
const io = @import("../../asm/io.zig");
const ports = @import("../../common/constants/ports.zig");
const serial_const = @import("../../common/constants/serial.zig");
pub fn init() void {
io.out_byte(ports.COM1_INT_ENABLE, 0x00);
io.out_byte(ports.COM1_LINE_CTRL, 0x80);
io.out_byte(ports.COM1_DATA, 0x03);
io.out_byte(ports.COM1_INT_ENABLE, 0x00);
io.out_byte(ports.COM1_LINE_CTRL, 0x03);
io.out_byte(ports.COM1_FIFO_CTRL, 0xC7);
io.out_byte(ports.COM1_MODEM_CTRL, 0x0B);
}
fn is_tx_empty() bool {
return (io.in_byte(ports.COM1_LINE_STATUS) & serial_const.LINE_STATUS_TX_EMPTY) != 0;
}
pub fn write(byte: u8) void {
while (!is_tx_empty()) {}
io.out_byte(ports.COM1_DATA, byte);
}
pub fn print(str: []const u8) void {
for (str) |c| {
write(c);
}
}
pub fn print_hex(value: u64) void {
const hex = "0123456789ABCDEF";
var i: u6 = 60;
while (true) : (i -%= 4) {
write(hex[int.u8_of((value >> i) & 0xF)]);
if (i == 0) break;
}
}
pub fn print_hex_u32(value: u32) void {
const hex = "0123456789ABCDEF";
var i: u5 = 28;
while (true) : (i -%= 4) {
write(hex[int.u8_of((value >> i) & 0xF)]);
if (i == 0) break;
}
}
pub fn print_hex_u8(value: u8) void {
const hex = "0123456789ABCDEF";
write(hex[value >> 4]);
write(hex[value & 0xF]);
}
pub fn printf(comptime fmt: []const u8, args: anytype) void {
comptime var i: usize = 0;
comptime var arg_index: usize = 0;
inline while (i < fmt.len) {
if (fmt[i] == '{' and i + 1 < fmt.len and fmt[i + 1] == '}') {
const arg = args[arg_index];
print_arg(arg);
arg_index += 1;
i += 2;
} else if (fmt[i] == '{' and i + 2 < fmt.len and fmt[i + 2] == '}') {
const spec = fmt[i + 1];
const arg = args[arg_index];
if (spec == 'x') {
print_arg_hex(arg);
} else if (spec == 'd') {
print_arg_decimal(arg);
} else if (spec == 's') {
print_arg_string(arg);
} else {
write('{');
write(spec);
write('}');
}
arg_index += 1;
i += 3;
} else {
write(fmt[i]);
i += 1;
}
}
}
fn print_arg(arg: anytype) void {
const T = @TypeOf(arg);
if (T == []const u8) {
print(arg);
} else if (T == u8) {
write(arg);
} else if (@typeInfo(T) == .int or @typeInfo(T) == .comptime_int) {
print_decimal(arg);
} else {
print("?");
}
}
fn print_arg_decimal(arg: anytype) void {
const T = @TypeOf(arg);
if (@typeInfo(T) == .int or @typeInfo(T) == .comptime_int) {
print_decimal(arg);
} else {
print("?");
}
}
fn print_arg_string(arg: anytype) void {
const T = @TypeOf(arg);
const info = @typeInfo(T);
if (T == []const u8) {
print(arg);
} else if (info == .pointer) {
const child = info.pointer.child;
const child_info = @typeInfo(child);
if (child == u8) {
// [*]const u8 - null-terminated string pointer
var i: usize = 0;
while (arg[i] != 0) : (i += 1) {
write(arg[i]);
}
} else if (child_info == .array and child_info.array.child == u8) {
// *const [N]u8 or *const [N:0]u8 - pointer to string literal
const slice = arg.*;
for (slice) |c| {
if (c == 0) break;
write(c);
}
} else {
print("?ptr");
}
} else {
print("?type");
}
}
fn print_arg_hex(arg: anytype) void {
const T = @TypeOf(arg);
if (T == u8) {
print_hex_u8(arg);
} else if (T == u32) {
print_hex_u32(arg);
} else if (@typeInfo(T) == .int or @typeInfo(T) == .comptime_int) {
print_hex(@as(u64, @intCast(arg)));
} else {
print("?");
}
}
fn print_decimal(value: anytype) void {
if (value == 0) {
write('0');
return;
}
var v: u64 = if (value < 0) @intCast(-value) else @intCast(value);
if (value < 0) write('-');
var buf: [20]u8 = undefined;
var len: usize = 0;
while (v > 0) : (v /= 10) {
buf[len] = int.u8_of(v % 10) + '0';
len += 1;
}
while (len > 0) {
len -= 1;
write(buf[len]);
}
}
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