splitting out descriptor declarations

1 files changed, 55 insertions, 0 deletions

diff --git a/kc/core/cpu/descriptor.h b/kc/core/cpu/descriptor.h
new file mode 100644
index 0000000..802c09c
--- /dev/null
+++ b/kc/core/cpu/descriptor.h
@@ -0,0 +1,55 @@
+#pragma once
+
+struct dtr64
+{
+    uint16_t limit;
+    uint64_t base;
+} __attribute__((packed));
+
+struct segment_descriptor
+{
+    uint16_t limit0;
+    uint16_t base0;
+    uint8_t base16;
+    uint8_t access;
+    uint8_t flags_limit16;
+    uint8_t base24;
+} __attribute__((packed));
+
+enum segment_descriptor_type
+{
+    CODE64_SUPER_SEG,
+    CODE64_USER_SEG,
+    DATA_SEG,
+    TASK64_SEG,
+};
+
+struct gate_descriptor
+{
+    uint16_t offset0;
+    uint16_t selector;
+    uint8_t ist;
+    uint8_t access;
+    uint16_t offset16;
+    uint64_t offset32;
+} __attribute__((packed));
+
+enum gate_descriptor_type
+{
+    EMPTY_GATE,
+    INT64_GATE,
+    TRAP64_GATE,
+};
+
+struct task64_segment
+{
+    uint32_t reserved0;
+    uint64_t rsp0;
+    uint64_t rsp1;
+    uint64_t rsp2;
+    uint64_t reserved1;
+    uint64_t ist[7];
+    uint16_t reserved2;
+    uint16_t iomap_base;
+};
+