From 46094a0e9615961480b6efa06490d669578326be Mon Sep 17 00:00:00 2001
From: Carlos <carlos.fenollosa@gmail.com>
Date: Fri, 20 Mar 2015 11:40:31 +0100
Subject: [PATCH] Updated gitignore

---
 .DS_Store                    | Bin 6148 -> 0 bytes
 .gitignore                   |   1 +
 19-interrupts-irqs/cpu/isr.c |   8 +++++---
 3 files changed, 6 insertions(+), 3 deletions(-)
 delete mode 100644 .DS_Store

diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 5008ddfcf53c02e82d7eee2e57c38e5672ef89f6..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 6148
zcmeH~Jr2S!425mzP>H1@V-^m;4Wg<&0T*E43hX&L&p$$qDprKhvt+--jT7}7np#A3
zem<@ulZcFPQ@L2!n>{z**<q8>++&mCkOWA81W14cNZ<zv;LbK1Poaz?KmsK2CSc!(
z0ynLxE!0092;Krf2c+FF_Fe*7ECH>lEfg7;MkzE(HCqgga^y>{tEnwC%0;vJ&^%eQ
zLs35+`xjp>T0<F0fCPF1$Cyrb|F7^5{eNG?83~ZUUlGt@xh*qZDeu<Z%US-OSsOPv
j)R!Z4KLME7ReXlK;d!wEw5GODWMKRea10D2@KpjYNUI8I

diff --git a/.gitignore b/.gitignore
index 8f8b858..f848b2f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 *.dis
 *.elf
 *.sym
+.DS_STORE
diff --git a/19-interrupts-irqs/cpu/isr.c b/19-interrupts-irqs/cpu/isr.c
index 4687c24..fcc613b 100644
--- a/19-interrupts-irqs/cpu/isr.c
+++ b/19-interrupts-irqs/cpu/isr.c
@@ -129,9 +129,11 @@ void register_interrupt_handler(u8 n, isr_t handler) {
 }
 
 void irq_handler(registers_t r) {
-    /* If the irq involves the slave (IRQ > 7), send an EOI to it */
-    if (r.int_no >= 40) port_byte_out(0xA0, 0x20);
-    port_byte_out(0x20, 0x20); /* Send EOI to master */
+    /* After every interrupt we need to send an EOI to the PICs
+     * or they will not send another interrupt again */
+    if (r.int_no >= 40) port_byte_out(0xA0, 0x20); /* slave */
+    port_byte_out(0x20, 0x20); /* master */
+
     /* Handle the interrupt in a more modular way */
     if (interrupt_handlers[r.int_no] != 0) {
         isr_t handler = interrupt_handlers[r.int_no];