From cdadc55a3470050b91e46f8ab53f34d21fe9c500 Mon Sep 17 00:00:00 2001
From: sbosse <sbosse@uni-bremen.de>
Date: Mon, 14 Oct 2024 23:07:40 +0200
Subject: [PATCH] Mon 14 Oct 23:06:38 CEST 2024

---
 kernel/event.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 kernel/event.c

diff --git a/kernel/event.c b/kernel/event.c
new file mode 100644
index 0000000..ae14e54
--- /dev/null
+++ b/kernel/event.c
@@ -0,0 +1,104 @@
+
+#include "event.h"
+#include "device.h"
+#include "keyboard.h"
+#include "mouse.h"
+#include "interrupt.h"
+#include "string.h"
+#include "process.h"
+
+#define EVENT_BUFFER_SIZE 32
+
+static struct event buffer[EVENT_BUFFER_SIZE];
+
+static int head=0;
+static int tail=0;
+static int overflow_count=0;
+
+static struct list queue = LIST_INIT;
+
+/* INTERRUPT CONTEXT */
+
+void event_post( uint16_t type, uint16_t code, int16_t x, int16_t y )
+{
+	/* If ring buffer is full, return immediately. */
+	int next = (head+1) % EVENT_BUFFER_SIZE;
+	if(next==tail) {
+		overflow_count++;
+		return;
+	}
+
+	/* Copy event to current buffer position */
+	struct event *e = &buffer[head];
+	e->type = type;
+	e->code = code;
+	e->x = x;
+	e->y = y;
+
+	/* Advance head pointer and wake up waiting process (if any) */
+	head = next;
+	process_wakeup(&queue);
+}
+
+int event_read_raw( struct event *e, int size, int blocking )
+{
+	int total=0;
+
+	if(size<sizeof(struct event)) return KERROR_INVALID_REQUEST;
+
+	interrupt_block();
+
+	while(size>=sizeof(struct event)) {
+
+		if(head==tail) {
+			if(blocking && total==0) {
+				process_wait(&queue);
+				continue;
+			} else {
+				break;
+			}
+		}
+
+		*e = buffer[tail];
+		tail = (tail+1) % EVENT_BUFFER_SIZE;
+		total++;
+		size -= sizeof(struct event);
+	}
+
+	interrupt_unblock();
+
+	return total;
+}
+
+int event_read( struct event *e, int size )
+{
+	return event_read_raw(e,size,1);
+}
+
+int event_read_nonblock( struct event *e, int size )
+{
+	return event_read_raw(e,size,0);
+}
+
+int event_read_keyboard()
+{
+	struct event e;
+	while(event_read(&e,sizeof(e))) {
+		if(e.type==EVENT_KEY_DOWN) {
+			return e.code;
+		}
+	}
+	return 'x';
+}
+
+void event_init()
+{
+	mouse_init();
+	keyboard_init();
+	printf("event: ready\n");
+}
+
+
+
+
+