feat(serial): input data echo

include/kernel/hw/serial.h

@@ -1,6 +1,10 @@
 #pragma once
 #include <asm/port_io.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define PORT_SERIAL0 (0x3f8)
 #define PORT_SERIAL1 (0x2f8)
 
@@ -11,3 +15,9 @@ uint8_t serial_read_data(port_id_t port);
 
 int32_t is_serial_ready_for_transmition(port_id_t port);
 void serial_send_data(port_id_t port, uint8_t data);
+
+void serial_receive_data_interrupt(void);
+
+#ifdef __cplusplus
+}
+#endif

src/kernel/hw/serial.c

@@ -1,31 +1,35 @@
-#include <kernel/hw/serial.h>
 #include <asm/port_io.h>
+#include <kernel/hw/serial.h>
+#include <kernel/stdio.h>
+#include <kernel/tty.h>
 
 int32_t init_serial_port(port_id_t port)
 {
     // taken from osdev.org
 
-   asm_outb(port + 1, 0x00);    // Disable all interrupts
-   asm_outb(port + 3, 0x80);    // Enable DLAB (set baud rate divisor)
-   // TODO: set baud rate
-   asm_outb(port + 0, 0x00);    // Set divisor to 0 -3- (lo byte) 115200 -38400- baud
-   asm_outb(port + 1, 0x00);    //                  (hi byte)
-   asm_outb(port + 3, 0x03);    // 8 bits, no parity, one stop bit
-   asm_outb(port + 2, 0xC7);    // Enable FIFO, clear them, with 14-byte threshold
-   // TODO: IRQ disabled
-   // asm_outb(port + 4, 0x0B);    // IRQs enabled, RTS/DSR set
-   asm_outb(port + 4, 0x1E);    // Set in loopback mode, test the serial chip
-   asm_outb(port + 0, 0xAE);    // Test serial chip (send byte 0xAE and check if serial returns same byte)
-
-   // Check if serial is faulty (i.e: not same byte as sent)
-   if(asm_inb(port + 0) != 0xAE) {
-      return 1;
-   }
-
-   // If serial is not faulty set it in normal operation mode
-   // (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
-   asm_outb(port + 4, 0x0F);
-   return 0;
+    asm_outb(port + 1, 0x00); // Disable all interrupts
+    asm_outb(port + 3, 0x80); // Enable DLAB (set baud rate divisor)
+    // TODO: set baud rate
+    asm_outb(port + 0, 0x00); // Set divisor to 0 -3- (lo byte) 115200 -38400- baud
+    asm_outb(port + 1, 0x00); //                  (hi byte)
+    asm_outb(port + 3, 0x03); // 8 bits, no parity, one stop bit
+    asm_outb(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
+    // TODO: IRQ disabled
+    asm_outb(port + 4, 0x0B); // IRQs enabled, RTS/DSR set
+    asm_outb(port + 4, 0x1E); // Set in loopback mode, test the serial chip
+    asm_outb(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
+
+    // Check if serial is faulty (i.e: not same byte as sent)
+    if (asm_inb(port + 0) != 0xAE) {
+        return 1;
+    }
+
+    // If serial is not faulty set it in normal operation mode
+    // (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
+    asm_outb(port + 4, 0x0F);
+
+    asm_outb(port + 1, 0x01); // Enable interrupts #0: Received Data Available
+    return 0;
 }
 
 int32_t is_serial_has_data(port_id_t port)
@@ -51,3 +55,34 @@ void serial_send_data(port_id_t port, uint8_t data)
         ;
     return asm_outb(port, data);
 }
+
+void serial_receive_data_interrupt(void)
+{
+    while (is_serial_has_data(PORT_SERIAL0)) {
+        uint8_t data = serial_read_data(PORT_SERIAL0);
+        char buf[64] = { 0 };
+        switch (data) {
+        case '\r':
+            serial_send_data(PORT_SERIAL0, '\r');
+            serial_send_data(PORT_SERIAL0, '\n');
+            break;
+        // ^?
+        case 0x7f:
+            serial_send_data(PORT_SERIAL0, 0x08);
+            serial_send_data(PORT_SERIAL0, '\x1b');
+            serial_send_data(PORT_SERIAL0, '[');
+            serial_send_data(PORT_SERIAL0, 'K');
+            break;
+        // ^U
+        case 0x15:
+            serial_send_data(PORT_SERIAL0, '\r');
+            serial_send_data(PORT_SERIAL0, '\x1b');
+            serial_send_data(PORT_SERIAL0, '[');
+            serial_send_data(PORT_SERIAL0, '2');
+            serial_send_data(PORT_SERIAL0, 'K');
+        default:
+            serial_send_data(PORT_SERIAL0, data);
+            break;
+        }
+    }
+}

src/kernel/interrupt.cpp

@@ -2,6 +2,7 @@
 
 #include <asm/port_io.h>
 #include <kernel/hw/keyboard.h>
+#include <kernel/hw/serial.h>
 #include <kernel/hw/timer.h>
 #include <kernel/interrupt.h>
 #include <kernel/mem.h>
@@ -236,6 +237,7 @@ extern "C" void irq3_handler(void)
 }
 extern "C" void irq4_handler(void)
 {
+    serial_receive_data_interrupt();
     asm_outb(PORT_PIC1_COMMAND, PIC_EOI);
 }
 extern "C" void irq5_handler(void)