From 022dfd0f42962da6c60fbeb5604e1455a07eaaa6 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 20 Jan 2022 16:28:18 -0700
Subject: Added System Timer Hook

---
 include/symbols.h   | 25 +++++++++++++++++++++++++
 include/util/time.h |  1 +
 src/cpu/irq.c       |  4 ++++
 src/sys/core.c      |  1 +
 src/util/status.c   |  9 +++++++++
 src/util/time.c     | 14 ++++++++++++++
 6 files changed, 54 insertions(+)

diff --git a/include/symbols.h b/include/symbols.h
index 4f4bb28..8c41c86 100644
--- a/include/symbols.h
+++ b/include/symbols.h
@@ -81,8 +81,33 @@ enum
 	GPU_INTERRUPTS_ROUTING = 0x4000000C,
 
 	CORE0_TIMER_IRQCNTL = 0x40000040,
+	CORE1_TIMER_IRQCNTL = 0x40000044,
+	CORE2_TIMER_IRQCNTL = 0x40000048,
+	CORE3_TIMER_IRQCNTL = 0x4000004c,
+	CORE0_MBOX_IRQCNTL  = 0x40000050,
+	CORE1_MBOX_IRQCNTL  = 0x40000054,
+	CORE2_MBOX_IRQCNTL  = 0x40000058,
+	CORE3_MBOX_IRQCNTL  = 0x4000005c,
 	CORE0_IRQ_SOURCE    = 0x40000060,
+	CORE1_IRQ_SOURCE    = 0x40000064,
+	CORE2_IRQ_SOURCE    = 0x40000068,
+	CORE3_IRQ_SOURCE    = 0x4000006c,
 	CORE0_FIQ_SOURCE    = 0x40000070,
+	CORE1_FIQ_SOURCE    = 0x40000074,
+	CORE2_FIQ_SOURCE    = 0x40000078,
+	CORE3_FIQ_SOURCE    = 0x4000007c,
+
+	SYS_TIMER_CS    = (MMIO_BASE + 0x3000),
+	SYS_TIMER_CHI   = (MMIO_BASE + 0x3004),
+	SYS_TIMER_CLO   = (MMIO_BASE + 0x3008),
+	SYS_TIMER_C0    = (MMIO_BASE + 0x300c),
+	SYS_TIMER_C1    = (MMIO_BASE + 0x3010),
+	SYS_TIMER_C2    = (MMIO_BASE + 0x3014),
+	SYS_TIMER_C3    = (MMIO_BASE + 0x3018),
+	SYS_TIMER_SC_M0 = (1 << 0),
+	SYS_TIMER_SC_M1 = (1 << 1),
+	SYS_TIMER_SC_M2 = (1 << 2),
+	SYS_TIMER_SC_M3 = (1 << 3),
 
 	/* Power Management, Reset controller and Watchdog registers */
 	//BCM2835_PERI_BASE        = 0x3F000000,
diff --git a/include/util/time.h b/include/util/time.h
index f73314f..dc51e00 100644
--- a/include/util/time.h
+++ b/include/util/time.h
@@ -9,6 +9,7 @@ unsigned long long read_cntvoff(void);
 unsigned long read_cntv_tval(void);
 void write_cntv_tval(unsigned long val);
 unsigned long read_cntfrq(void);
+unsigned long long get_time(void);
 
 static inline void enablecntv(void)
 {
diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index f1d8fb6..fb73b8a 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -102,6 +102,8 @@ void c_irq_handler(void)
 	} else if (source & (1 << 3)) {
 		c_timer();
 		return;
+	} else {
+		uart_string("Unknown Interrupt Detected!");
 	}
 	return;
 }
@@ -196,6 +198,8 @@ void c_fiq_handler(void)
 	} else if (source & (1 << 3)) {
 		c_timer();
 		return;
+	} else {
+		uart_string("Unknown Interrupt Detected!");
 	}
 	return;
 }
diff --git a/src/sys/core.c b/src/sys/core.c
index 0b4b91a..d658d90 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -33,6 +33,7 @@ void sysinit(void)
 	cmdidx = 0;
 	for(int i = 0; i < 2048; i++)
 		cmd[i] = 0;
+	*(unsigned long*) SYS_TIMER_C0 = 60000000; // 60 second trigger
 	///...
 
 	// Route GPU interrupts to Core 0
diff --git a/src/util/status.c b/src/util/status.c
index dd2b899..7abf931 100644
--- a/src/util/status.c
+++ b/src/util/status.c
@@ -162,6 +162,15 @@ void status(void)
 	"and %0, %0, #3" : "=r"(coren) :: "cc");
 	write_string(&g_Drawer, "Status Updated by Core #");
 	write_10(&g_Drawer, coren);
+	write_string(&g_Drawer, "\nSys Timer Status: ");
+	coren = *(unsigned long*)SYS_TIMER_CS;
+	write_10(&g_Drawer, coren);
+	write_string(&g_Drawer, " : ");
+	unsigned long long tval = get_time();
+	write_hex32(&g_Drawer, (tval >> 32));
+	write_hex32(&g_Drawer, tval);
+	write_char(&g_Drawer, '\n');
+	write_10(&g_Drawer, ((unsigned long)tval)/1000000);
 
 	g_Drawer.x = x;
 	g_Drawer.y = y;
diff --git a/src/util/time.c b/src/util/time.c
index a0c539b..e9e5716 100644
--- a/src/util/time.c
+++ b/src/util/time.c
@@ -51,3 +51,17 @@ unsigned long read_cntfrq(void)
 	asm volatile ("mrc p15, 0, %0, c14, c0, 0" : "=r"(val) );
 	return val;
 }
+
+unsigned long long get_time(void)
+{
+	union {
+		unsigned long long tval;
+		struct {
+			unsigned long high;
+			unsigned long low;
+		} tvalb;
+	} t;
+	t.tvalb.low = *(unsigned long*)SYS_TIMER_CLO;
+	t.tvalb.high = *(unsigned long*)SYS_TIMER_CHI;
+	return t.tval;
+}
-- 
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