From 551085f910bb601d3ffe0fc548a1daf5bdc54f9b Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 20 Jan 2022 14:45:39 -0700
Subject: Added FIQ handler C fxn

---
 src/cpu/irq.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

(limited to 'src')

diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index 2cb0856..f1d8fb6 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -106,6 +106,100 @@ void c_irq_handler(void)
 	return;
 }
 
+void c_fiq_handler(void)
+{
+	unsigned long source = load32(CORE0_FIQ_SOURCE);
+	if (source & (1 << 8)) {
+		if(load32(IRQ_PENDING2) & (1 << 25)) {
+			if(load32(UART0_MIS) & (1<<4)) {
+				unsigned long data = load32(UART0_DR);
+				// Ctrl+Tab to toggle timer
+				if(data == 0x14) {
+					unsigned long timer_status;
+					asm volatile("mrc p15, 0, %0, c14, c3, 1" : "=r"(timer_status));
+					unsigned int x = g_Drawer.x;
+					unsigned int y = g_Drawer.y;
+					g_Drawer.x = 0;
+					g_Drawer.y = 5;
+					write_string(&g_Drawer, "TIMER: ");
+					if(timer_status == 0) {
+						cntfrq = read_cntfrq();
+						write_cntv_tval(cntfrq/CPS);
+						enablecntv();
+						write_cstring(&g_Drawer, "Enabled ", 0x00FF00);
+					} else {
+						disablecntv();
+						write_cstring(&g_Drawer, "Disabled", 0xFF0000);
+					}
+					g_Drawer.x = x;
+					g_Drawer.y = y;
+				} else {
+					unsigned long off = cmdidx;
+					if (off < 2048) {
+						// Newline Case
+						if (data == 0x0D) {
+							for(int i = off; i>=0;i--)
+								cmd[i] = 0x0;
+							off = 0;
+						// Backspace Case
+						} else if (data == 0x08 || data == 0x7F) {
+							if (off > 0) {
+								off -= 1;
+							}
+							cmd[off] = 0x0;
+						// Lock Case
+						} else if (data == 0x6C) {
+							cmd[off] = (char) data;
+							off += 1;
+							lock_mutex(&exe_cnt_m, SYS_PID);
+						// Release Case
+						} else if (data == 0x72) {
+							cmd[off] = (char) data;
+							off += 1;
+							release_mutex(&exe_cnt_m, SYS_PID);
+						// New Task Case
+						} else if (data == 0x61) {
+							cmd[off] = (char) data;
+							off += 1;
+							//_start(); // Trigger reset
+							//heap_info_u();
+						// Else output
+						} else {
+							cmd[off] = (char) data;
+							off += 1;
+						}
+					} else if (off == 2048) {
+						if (data == 0x0D) {
+							for(int i = off; i>=0;i--)
+								cmd[i] = 0x0;
+							off = 0;
+						} else if (data == 0x08 || data == 0x7F) {
+							if (off > 0) {
+								off -= 1;
+							}
+							cmd[off] = 0x0;
+						}
+					}
+					cmdidx = off;
+				}
+				g_Drawer.x = 0;
+				g_Drawer.y = 7;
+				for(int i = 0; i < 128; i++)
+					write_char(&g_Drawer, ' ');
+				g_Drawer.x = 0;
+				g_Drawer.y = 7;
+				write_string(&g_Drawer, "> ");
+				write_string(&g_Drawer, cmd);
+				return;
+			}
+		}
+	} else if (source & (1 << 3)) {
+		c_timer();
+		return;
+	}
+	return;
+}
+
 void localtest(void)
 {
 	struct Thread* t = scheduler.rthread_ll->data;
-- 
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