From 0fa5f5f2c65d53bdc8d1a9337bc76e278dc304f2 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 19 May 2025 00:49:28 -0400
Subject: kernel: acpi: Add stub power button handler

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/dev/acpi/uacpi.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'sys/dev')

diff --git a/sys/dev/acpi/uacpi.c b/sys/dev/acpi/uacpi.c
index 9e5ae6b..7dbcb35 100644
--- a/sys/dev/acpi/uacpi.c
+++ b/sys/dev/acpi/uacpi.c
@@ -40,6 +40,7 @@
 #include <uacpi/sleep.h>
 #include <machine/cdefs.h>
 #include <machine/pio.h>
+#include <machine/cpu.h>
 #if defined(__x86_64__)
 #include <machine/idt.h>
 #include <machine/ioapic.h>
@@ -57,6 +58,19 @@ typedef struct {
     uacpi_size length;
 } io_range_t;
 
+/*
+ * TODO: Schedule a system shutdown
+ */
+static uacpi_interrupt_ret
+power_button_handler(uacpi_handle ctx)
+{
+    md_intoff();
+    kprintf("power button pressed\n");
+    kprintf("halting machine...\n");
+    cpu_halt_all();
+    return UACPI_INTERRUPT_HANDLED;
+}
+
 void *
 uacpi_kernel_alloc(uacpi_size size)
 {
@@ -541,5 +555,17 @@ uacpi_init(void)
         return -1;
     }
 
+    ret = uacpi_install_fixed_event_handler(
+        UACPI_FIXED_EVENT_POWER_BUTTON,
+        power_button_handler, UACPI_NULL
+    );
+
+    if (uacpi_unlikely_error(ret)) {
+        kprintf("failed to install power button event: %s\n",
+            uacpi_status_to_string(ret)
+        );
+        return -1;
+    }
+
     return 0;
 }
-- 
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