From 01725789fdf7e28a8f0d03c8ad133cc15c2bc947 Mon Sep 17 00:00:00 2001
From: g1n <g1n@ttm.sh>
Date: Mon, 6 Sep 2021 19:33:29 +0300
Subject: [PATCH] Kernel: Add keyboard

---
 kernel/kernel/early_kernel.c | 12 ++++----
 kernel/kernel/interrupts.c   | 29 +++++++++---------
 kernel/kernel/kernel.c       |  5 +++-
 kernel/kernel/keyboard.c     | 58 ++++++++++++++++++++++++++++++++++++
 4 files changed, 84 insertions(+), 20 deletions(-)
 create mode 100644 kernel/kernel/keyboard.c

diff --git a/kernel/kernel/early_kernel.c b/kernel/kernel/early_kernel.c
index 0734e92..5a0a08a 100644
--- a/kernel/kernel/early_kernel.c
+++ b/kernel/kernel/early_kernel.c
@@ -5,8 +5,9 @@
 #include "serial.h"
 #include "gdt.c"
 #include "interrupts.c"
-#include "timer.c"
-#include "paging.h"
+//#include "timer.c"
+#include "keyboard.c"
+//#include "paging.h"
 
 void kernel_early_main(void) {
   gdt_init();
@@ -14,9 +15,10 @@ void kernel_early_main(void) {
   serial_printf("gdt initialized!\n");
   idt_init();
   serial_printf("idt initialized!\n");
-  init_timer(50); // Initialise timer to 50Hz
+  //init_timer(50); // Initialise timer to 50Hz
   serial_printf("timer initialized!\n");
-  init_paging(); 
-  serial_printf("paging initialized!\n");
+  //init_paging(); 
+  //serial_printf("paging initialized!\n");
   terminal_initialize();
+  init_keyboard();
 }
diff --git a/kernel/kernel/interrupts.c b/kernel/kernel/interrupts.c
index e510aef..4193d9d 100644
--- a/kernel/kernel/interrupts.c
+++ b/kernel/kernel/interrupts.c
@@ -64,18 +64,6 @@ void idt_init() {
 
   memset(idt_entries, 0, sizeof(idt_entry_t)*256);
 
-  // Remap the irq table.
-  outb(0x20, 0x11);
-  outb(0xA0, 0x11);
-  outb(0x21, 0x20);
-  outb(0xA1, 0x28);
-  outb(0x21, 0x04);
-  outb(0xA1, 0x02);
-  outb(0x21, 0x01);
-  outb(0xA1, 0x01);
-  outb(0x21, 0x0);
-  outb(0xA1, 0x0);
-  
   extern isr_t isr0;
   extern isr_t isr1;
   extern isr_t isr2;
@@ -159,6 +147,21 @@ void idt_init() {
   idt_set_gate(30, (uint32_t)&isr30, 0x08, 0x8E);
   idt_set_gate(31, (uint32_t)&isr31, 0x08, 0x8E);
  
+  extern void idt_flush(uint32_t);
+  idt_flush((uint32_t)&idt_ptr);
+
+  // Remap the irq table.
+  outb(0x20, 0x11);
+  outb(0xA0, 0x11);
+  outb(0x21, 0x20);
+  outb(0xA1, 0x28);
+  outb(0x21, 0x04);
+  outb(0xA1, 0x02);
+  outb(0x21, 0x01);
+  outb(0xA1, 0x01);
+  outb(0x21, 0x0);
+  outb(0xA1, 0x0);
+  
   idt_set_gate(32, (uint32_t)&irq0, 0x08, 0x8E);
   idt_set_gate(33, (uint32_t)&irq1, 0x08, 0x8E);
   idt_set_gate(34, (uint32_t)&irq2, 0x08, 0x8E);
@@ -176,8 +179,6 @@ void idt_init() {
   idt_set_gate(46, (uint32_t)&irq14, 0x08, 0x8E);
   idt_set_gate(47, (uint32_t)&irq15, 0x08, 0x8E);
 
-  extern void idt_flush(uint32_t);
-  idt_flush((uint32_t)&idt_ptr);
 }
 
 void isr_handler(registers_t regs)
diff --git a/kernel/kernel/kernel.c b/kernel/kernel/kernel.c
index 51cc37b..5834ab5 100644
--- a/kernel/kernel/kernel.c
+++ b/kernel/kernel/kernel.c
@@ -9,6 +9,9 @@ void kernel_main(void) {
 	char * test_string = "test";
 	serial_printf("This is string from variable: %s\n", test_string);
 
-	asm volatile ("int $0x3");
 	printf("Test finished success!\n");
+  	asm volatile("sti");
+	for(;;) {
+		asm("hlt");
+	}
 }
diff --git a/kernel/kernel/keyboard.c b/kernel/kernel/keyboard.c
new file mode 100644
index 0000000..9377229
--- /dev/null
+++ b/kernel/kernel/keyboard.c
@@ -0,0 +1,58 @@
+unsigned char kbdus[128] =
+{
+    0,  27, '1', '2', '3', '4', '5', '6', '7', '8',	/* 9 */
+  '9', '0', '-', '=', '\b',	/* Backspace */
+  '\t',			/* Tab */
+  'q', 'w', 'e', 'r',	/* 19 */
+  't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',	/* Enter key */
+    0,			/* 29   - Control */
+  'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',	/* 39 */
+ '\'', '`',   0,		/* Left shift */
+ '\\', 'z', 'x', 'c', 'v', 'b', 'n',			/* 49 */
+  'm', ',', '.', '/',   0,				/* Right shift */
+  '*',
+    0,	/* Alt */
+  ' ',	/* Space bar */
+    0,	/* Caps lock */
+    0,	/* 59 - F1 key ... > */
+    0,   0,   0,   0,   0,   0,   0,   0,
+    0,	/* < ... F10 */
+    0,	/* 69 - Num lock*/
+    0,	/* Scroll Lock */
+    0,	/* Home key */
+    0,	/* Up Arrow */
+    0,	/* Page Up */
+  '-',
+    0,	/* Left Arrow */
+    0,
+    0,	/* Right Arrow */
+  '+',
+    0,	/* 79 - End key*/
+    0,	/* Down Arrow */
+    0,	/* Page Down */
+    0,	/* Insert Key */
+    0,	/* Delete Key */
+    0,   0,   0,
+    0,	/* F11 Key */
+    0,	/* F12 Key */
+    0,	/* All other keys are undefined */
+};		
+
+/* Handles the keyboard interrupt */
+static void keyboard_handler(struct regs *r)
+{
+    unsigned char scancode = inb(0x60);
+
+    if (scancode & 0x80)
+    {
+	    // Shift, alt, ctrl keys
+    }
+    else
+    {
+            printf("%c", kbdus[scancode]);
+    }
+}
+void init_keyboard()
+{
+  register_interrupt_handler(IRQ1, &keyboard_handler);
+}