From 98659d919772cdee372ab4a4d63bd68fa469174e Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Sat, 24 Aug 2019 16:41:58 +0200
Subject: first: introduce wait_for_irq

---
 software/first/setup_timer_irq.S | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'software/first/setup_timer_irq.S')

diff --git a/software/first/setup_timer_irq.S b/software/first/setup_timer_irq.S
index c3e7513..bba356d 100644
--- a/software/first/setup_timer_irq.S
+++ b/software/first/setup_timer_irq.S
@@ -1,6 +1,7 @@
 .section .text
 .align 2
 .global setup_timer_irq
+.global wait_for_irq
 .include "gpio.inc"
 .include "memory_map.inc"
 
@@ -97,3 +98,13 @@ exit:
 	lw a0, 4(sp)    # restore first argument to function
 	addi sp, sp, 28 # deallocate stack frame
 	mret            # exit IRQ handler
+
+
+wait_for_irq:
+	csrr t0, mip
+	csrr t1, mcause
+	csrr t2, mtvec
+	csrr t3, mstatus
+	csrr t4, mie
+	wfi
+	ret
-- 
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