1 files changed, 68 insertions, 0 deletions
diff --git a/sys/arch/amd64/idt.c b/sys/arch/amd64/idt.c
new file mode 100644
index 0000000..46eb1f8
--- /dev/null
+++ b/sys/arch/amd64/idt.c
@@ -0,0 +1,68 @@
+/*
+ * 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 <machine/idt.h>
+
+static struct idt_entry idt[256];
+static struct idtr idtr = {
+    .limit  = sizeof(struct idt_entry) * 256 - 1,
+    .offset = (uintptr_t)&idt[0]
+};
+
+void
+idt_load(void)
+{
+    LIDT(idtr);
+}
+
+void
+idt_set_desc(uint8_t vec, uint8_t type, uintptr_t isr, uint8_t ist)
+{
+    struct idt_entry *desc;
+
+    if (vec >= 255) {
+        /* Invalid vector */
+        return;
+    }
+
+    desc = &idt[vec];
+    desc->off_lo = __SHIFTOUT(isr, __MASK(16));
+    desc->off_mid = __SHIFTOUT(isr, __MASK(16) << 16);
+    desc->off_hi = __SHIFTOUT(isr, __MASK(32) << 32);
+    desc->segsel = 0x8;             /* Kernel CS */
+    desc->type = type;
+    desc->dpl = 3;
+    desc->p = 1;
+    desc->zero = 0;
+    desc->zero1 = 0;
+    desc->reserved = 0;
+    desc->ist = ist;
+}