kernel/acpi: Improve modularity

git-svn-id: https://svn.vegaa.systems/svn/vega-Vega/trunk@17 a8a8aea2-181d-ee11-89e8-15fd0e089fc4

1 files changed, 46 insertions, 0 deletions

diff --git a/sys/firmware/acpi/acpi_subr.c b/sys/firmware/acpi/acpi_subr.c
new file mode 100644
index 0000000..31fec91
--- /dev/null
+++ b/sys/firmware/acpi/acpi_subr.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of VegaOS nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* $Id */
+
+#include <firmware/acpi/acpi.h>
+
+bool
+acpi_is_checksum_valid(struct acpi_header *hdr)
+{
+    uint8_t sum;
+
+    sum = 0;
+    for (int i = 0; i < hdr->length; ++i) {
+        sum += ((char *)hdr)[i];
+    }
+
+    /* Sum of table (from header to end) must be zero!! */
+    return sum == 0;
+}