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This commit is contained in:
Carlos 2015-03-20 11:40:31 +01:00
parent 6e5a09981a
commit 46094a0e96
3 changed files with 6 additions and 3 deletions
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.DS_Store vendored
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.gitignore vendored
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@ -4,3 +4,4 @@
*.dis *.dis
*.elf *.elf
*.sym *.sym
.DS_STORE

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