Rewrite the keyboard driver much more properly

kernel/include/keyboard.hpp

@@ -3,6 +3,15 @@
 
 #include "types.hpp"
 
+namespace keyboard {
+
+const char KEY_ENTER = 0x1C;
+const char KEY_BACKSPACE = 0x0E;
+
+void install_driver();
+char get_char();
 char key_to_ascii(uint8_t key);
 
+}
+
 #endif

kernel/src/kernel.cpp

@@ -1,6 +1,7 @@
 #include "memory.hpp"
 #include "timer.hpp"
 #include "shell.hpp"
+#include "keyboard.hpp"
 
 extern "C" {
 
@@ -8,6 +9,7 @@ void  __attribute__ ((section ("main_section"))) kernel_main(){
     load_memory_map();
     init_memory_manager();
     install_timer();
+    keyboard::install_driver();
     init_shell();
 
     return;

kernel/src/keyboard.cpp

@@ -1,4 +1,5 @@
 #include "keyboard.hpp"
+#include "kernel_utils.hpp"
 
 namespace {
 
@@ -42,8 +43,50 @@ char qwertz[128] =
     0,	/* All other keys are undefined */
 };
 
+const uint8_t BUFFER_SIZE = 64;
+
+char input_buffer[BUFFER_SIZE];
+volatile uint8_t start;
+volatile uint8_t count;
+
+void keyboard_handler(){
+    auto key = static_cast<char>(in_byte(0x60));
+
+    if(count == BUFFER_SIZE){
+        //The buffer is full, we loose the characters
+    } else {
+        auto end = (start + count) % BUFFER_SIZE;
+        input_buffer[end] = key;
+        ++count;
+    }
 }
 
-char key_to_ascii(uint8_t key){
+}
+
+void keyboard::install_driver(){
+    register_irq_handler<1>(keyboard_handler);
+
+    start = 0;
+    count = 0;
+}
+
+char keyboard::get_char(){
+    //Wait for the buffer to contains something
+    while(count == 0){
+        __asm__  __volatile__ ("nop");
+        __asm__  __volatile__ ("nop");
+        __asm__  __volatile__ ("nop");
+        __asm__  __volatile__ ("nop");
+        __asm__  __volatile__ ("nop");
+    }
+
+    auto key = input_buffer[start];
+    start = (start + 1) % BUFFER_SIZE;
+    --count;
+
+    return key;
+}
+
+char keyboard::key_to_ascii(uint8_t key){
     return qwertz[key];
 }

kernel/src/shell.cpp

@@ -46,45 +46,44 @@ char current_input[50];
 
 void exec_command();
 
-#define KEY_ENTER 0x1C
-#define KEY_BACKSPACE 0x0E
+void start_shell(){
+    while(true){
+        auto key = keyboard::get_char();
 
-void keyboard_handler(){
-    uint8_t key = in_byte(0x60);
-
-    if(key & 0x80){
-        //TODO Handle shift
-    } else {
-        if(key == KEY_ENTER){
-            current_input[current_input_length] = '\0';
-
-            k_print_line();
-
-            exec_command();
-
-            if(get_column() != 0){
-                set_column(0);
-                set_line(get_line() + 1);
-            }
-
-            current_input_length = 0;
-
-            k_print("thor> ");
-        } else if(key == KEY_BACKSPACE){
-            if(current_input_length > 0){
-                set_column(get_column() - 1);
-                k_print(' ');
-                set_column(get_column() - 1);
-
-                --current_input_length;
-            }
+        if(key & 0x80){
+            //TODO Handle shift
         } else {
-           auto qwertz_key = key_to_ascii(key);
+            if(key == keyboard::KEY_ENTER){
+                current_input[current_input_length] = '\0';
 
-           if(qwertz_key > 0){
-               current_input[current_input_length++] = qwertz_key;
-               k_print(qwertz_key);
-           }
+                k_print_line();
+
+                exec_command();
+
+                if(get_column() != 0){
+                    set_column(0);
+                    set_line(get_line() + 1);
+                }
+
+                current_input_length = 0;
+
+                k_print("thor> ");
+            } else if(key == keyboard::KEY_BACKSPACE){
+                if(current_input_length > 0){
+                    set_column(get_column() - 1);
+                    k_print(' ');
+                    set_column(get_column() - 1);
+
+                    --current_input_length;
+                }
+            } else {
+                auto qwertz_key = keyboard::key_to_ascii(key);
+
+                if(qwertz_key > 0){
+                    current_input[current_input_length++] = qwertz_key;
+                    k_print(qwertz_key);
+                }
+            }
         }
     }
 }
@@ -291,5 +290,5 @@ void init_shell(){
 
     k_print("thor> ");
 
-    register_irq_handler<1>(keyboard_handler);
+    start_shell();
 }