From 86de700207fb0114ec52fafc36f84e1cbe508fd8 Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Mon, 14 Feb 2022 00:33:18 +0000
Subject: entering idle loop works with timer

---
 kc/core/pic8259.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'kc/core/pic8259.c')

diff --git a/kc/core/pic8259.c b/kc/core/pic8259.c
index f449e38..b1de903 100644
--- a/kc/core/pic8259.c
+++ b/kc/core/pic8259.c
@@ -21,11 +21,18 @@
 #define OCW3_READ_ISR 0xb
 #define OCW3_EOI 0x20
 
-typedef int (*pic8259_handler_func)(uint8_t irq);
-
 pic8259_handler_func irq_handlers[PIC_ISR_COUNT];
 
-__attribute__((optimize("O3")))
+void pic8259_irq_install(uint8_t irq, pic8259_handler_func h)
+{
+    if (irq_handlers[irq])
+    {
+        kprintf("attempt to overwrite irq handler for %u\n", irq);
+        return;
+    }
+    irq_handlers[irq] = h;
+}
+
 static void wait(void)
 {
     // stall for a few cycles
-- 
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