Add support for reading keyboard

.gitignore

@@ -5,6 +5,7 @@ iso_root
 *.o
 .vscode
 docs
+**/compile_commands.json
 
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.

kernel/include/kernel/fs/chardev.h

@@ -1,5 +1,10 @@
 #pragma once
 
 #include <kernel/fs/vfs.h>
+#include <kernel/process.h>
+
+struct chardev_info {
+	process_queue rsrc_wait_queue;
+};
 
 void init_tty1 (inode* absolute_root);

kernel/include/kernel/fs/vfs.h

@@ -19,6 +19,9 @@ typedef enum { UNDEF, EFILE, DIRECTORY, LINK, CHAR_DEV } file_type_t;
 typedef struct inode inode;
 typedef struct file	 file;
 
+typedef struct chardev_info chardev_info_t;
+typedef struct ramfs_info	ramfs_info_t;
+
 typedef struct {
 	int (*lookup) (char*, inode**, inode*);
 	int (*create) (char*, inode**, inode*);
@@ -40,6 +43,10 @@ struct inode {
 	inode_operations* i_iops;
 	file_operations*  i_fops;
 	file_type_t		  i_type;
+	union {
+		chardev_info_t* chardev_info;
+		ramfs_info_t*	ramfs_info;
+	} i_info;
 };
 
 struct file {

kernel/include/kernel/hw/keyboard.h

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <stdint.h>
+
+constexpr unsigned short kb_ps2_data_port = 0x60;
+constexpr unsigned short kb_ps2_status_port = 0x64;
+constexpr unsigned short kb_ps2_cmd_port = 0x64;
+
+constexpr unsigned char kb_ps2_cmd_get_ccb = 0x20;
+constexpr unsigned char kb_ps2_cmd_set_ccb = 0x60;
+constexpr unsigned char kb_ps2_disable_port_2 = 0xA7;
+constexpr unsigned char kb_ps2_enable_port_2 = 0xA8;
+constexpr unsigned char kb_ps2_test_port_2 = 0xA9;
+constexpr unsigned char kb_ps2_test_controller = 0xAA;
+constexpr unsigned char kb_ps2_test_port_1 = 0xAB;
+constexpr unsigned char kb_ps2_disable_port_1 = 0xAD;
+constexpr unsigned char kb_ps2_enable_port_1 = 0xAE;
+constexpr unsigned char kb_ps2_read_controller_ip = 0xC0;
+constexpr unsigned char kb_ps2_read_controller_op = 0xD0;
+constexpr unsigned char kb_ps2_write_controller_op = 0xD0;
+constexpr unsigned char kb_ps2_reset = 0xFF;
+
+typedef union {
+	uint8_t raw;
+	struct {
+		uint8_t irq1_enable : 1;
+		uint8_t irq12_enable : 1;
+		uint8_t system_flag : 1;
+		uint8_t reserved1 : 1;
+		uint8_t port_1_clock_disable : 1;
+		uint8_t port_2_clock_disable : 1;
+		uint8_t port_1_tl_enable : 1;
+		uint8_t reserved2 : 1;
+	} __attribute__ ((packed));
+} kb_ps2_cfg_byte_t;
+
+typedef union {
+	uint8_t raw;
+	struct {
+		uint8_t system_reset : 1;
+		uint8_t a20_gate : 1;
+		uint8_t port_2_clock : 1;
+		uint8_t port_2_data : 1;
+		uint8_t op_buffer_is_port_1 : 1;
+		uint8_t op_buffer_is_port_2 : 1;
+		uint8_t port_1_clock : 1;
+		uint8_t port_1_data : 1;
+	} __attribute__ ((packed));
+} kb_ps2_controller_output_port_t;
+
+typedef union {
+	uint8_t raw;
+	struct {
+		uint8_t out_buffer_full : 1;
+		uint8_t in_buffer_full : 1;
+		uint8_t system_flag : 1;
+		uint8_t is_controller_command : 1;
+		uint8_t reserved : 2;
+		uint8_t is_timeout_error : 1;
+		uint8_t is_parity_error : 1;
+	} __attribute__ ((packed));
+} kb_ps2_status_register_t;
+
+typedef void (*kb_tty_handler_t) (unsigned char);
+
+void		  init_kb (void);
+void		  register_kb_tty_handler (kb_tty_handler_t handler);
+unsigned char pop_next_char (void);