From 93bf62580a68533dc8252b9a2a055c02f34ecb67 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 24 Mar 2022 09:38:08 -0700
Subject: Modularized

---
 kernel/cpu/irq.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 kernel/cpu/irq.c

(limited to 'kernel/cpu')

diff --git a/kernel/cpu/irq.c b/kernel/cpu/irq.c
new file mode 100644
index 0000000..f89bba9
--- /dev/null
+++ b/kernel/cpu/irq.c
@@ -0,0 +1,93 @@
+#include <cpu.h>
+#include <cpu/irq.h>
+#include <globals.h>
+#include <graphics/lfb.h>
+#include <symbols.h>
+#include <sys/core.h>
+#include <sys/schedule.h>
+#include <tests/test.h>
+#include <util/mutex.h>
+#include <util/status.h>
+#include <util/time.h>
+#include <usr/main.h>
+
+#define CPS 1000
+
+void handle_data(unsigned char);
+
+static unsigned long counter = 0;
+unsigned long c_irq_handler(void)
+{
+	unsigned long source = load32(CORE0_IRQ_SOURCE);
+	// Check if GPU Interrupt
+	if (source & (1 << 8)) {
+		// Check if UART Interrupt
+		if(load32(IRQ_PENDING2) & (1 << 25)) {
+			// Check if UART Interrupt is Masked
+			if(load32(UART0_MIS) & (1<<4)) {
+				// Get the UART data
+				unsigned long data = load32(UART0_DR);
+
+				// Handle the recieved data
+#ifdef DEBUG
+				// Ctrl+G to output scheduler debug info
+				if (data == 0x7) {
+					uart_scheduler();
+					uart_mutexes();
+				}
+#endif
+				// Add task to handle the data
+				{
+					add_thread(handle_data, (void*)data, PRIORITIES-1);
+					return 1;
+				}
+			}
+		}
+		// Check if System Time Compare 0 Triggered the Interrupt
+		if (*(volatile unsigned long*)SYS_TIMER_CS & SYS_TIMER_SC_M0) {
+			volatile unsigned long* timer_cs = (volatile unsigned long*)SYS_TIMER_CS;
+			volatile unsigned long* timer_chi = (volatile unsigned long*)SYS_TIMER_CHI;
+			volatile unsigned long* nexttime = (volatile unsigned long*)SYS_TIMER_C0;
+			add_thread_without_duplicate(main, 0, 0);
+			*nexttime = *timer_chi + USR_TIME;
+			*timer_cs = SYS_TIMER_SC_M0;
+			return 1;
+		}
+	}
+	// Check if CNTV triggered the interrupt
+	else if (source & (1 << 3)) {
+		// Reset the counter
+		write_cntv_tval(cntfrq);
+		counter++;
+		if (counter % 0x6000 == 0)
+			counter = 0;
+	}
+	return 0;
+}
+
+unsigned long c_fiq_handler(void)
+{
+	unsigned long source = load32(CORE0_FIQ_SOURCE);
+	// Check if CNTV triggered the interrupt
+	if (source & (1 << 3)) {
+		write_cntv_tval(cntfrq);
+	}
+	return 0;
+}
+
+void handle_data(unsigned char data)
+{
+	// Newline Case
+	if (data == 0x0D) {
+	// Backspace Case
+	} else if (data == 0x08 || data == 0x7F) {
+	} else if (data == 0x61) {
+		add_thread(uart_scheduler, 0, 2);
+	} else if (data == 0x62) {
+		//add_thread(test_entry, 0, 2);
+	}
+	// Draw it on the screen
+	{
+		draw_chex32(0, 9, data, 0xAA00FF);
+	}
+}
-- 
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