ps2kbd: initial implementation

src/arch/x86_64/ps2kbd.c

@@ -0,0 +1,81 @@
+#include <arch/ps2kbd.h>
+#include <arch/io.h>
+#include <stdbool.h>
+#include <arch/cls.h>
+#include <arch/idt.h>
+#include <arch/apic.h>
+#include <kernel/keyboard.h>
+
+#define PS2_PORT_DATA 0x60
+#define PS2_PORT_COMMAND 0x64
+#define PS2_PORT_STATUS 0x64
+#define RESEND 0xFE
+#define ACK 0xFA
+#define ECHO 0xEE
+#define KEYBOARDIRQ 1
+
+static int kb;
+
+static uint8_t ps2cmd(uint8_t cmd){
+	
+	uint8_t response;
+
+	for(size_t i = 0; i < 3; ++i){
+		outb(PS2_PORT_DATA, cmd);
+		response = inb(PS2_PORT_DATA);
+		
+		if(response != RESEND)
+			break;
+
+	}
+
+	return response;
+
+}
+
+static char asciitable[] = {
+	0, '\033', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\b', '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n', 0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', 0, 0, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0, '*', 0, ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '7', '8', '9', '-', '4', '5', '6', '+', '4', '1', '2', '3', '0', '.', 0, 0, 0, 0, 0
+};
+
+void ps2kbd_irq(){
+	uint8_t scancode = inb(0x60);
+	if(scancode == 0xE0)
+		return; // TODO support extended scancodes
+	
+	kbpacket_t packet;
+	
+	// TODO convert scancode to keycode
+
+	packet.flags = 0;
+
+	if(scancode & 0x80){
+		packet.flags = KBPACKET_FLAGS_RELEASED;
+		scancode &= 0x7F;
+	}
+
+	packet.ascii = asciitable[scancode];
+
+	keyboard_packet(kb, &packet);
+
+}
+
+void ps2kbd_init(){
+	
+	// maybe the ps/2 controller and keyboard should be initialised to a known state
+	// and not be assumed to be set up in a working manner by the firmware/bootloader
+	
+	// this probably shouldn't assume the keyboard always being in the first port but oh well
+	
+	// clear keyboard buffer data
+
+	inb(PS2_PORT_DATA);
+	
+	if(ps2cmd(ECHO) != ECHO){
+		printf("No PS/2 keyboard found.\n");
+		return;
+	}
+	
+	ioapic_setlegacyirq(KEYBOARDIRQ, VECTOR_PS2KBD, arch_getcls()->lapicid, false);
+	
+	kb = keyboard_getnew();
+}