1 files changed, 93 insertions, 0 deletions
diff --git a/src/bits32/task.rs b/src/bits32/task.rs
new file mode 100644
index 0000000..17bdcd4
--- /dev/null
+++ b/src/bits32/task.rs
@@ -0,0 +1,93 @@
+//! Helpers to program the task state segment.
+//! See Intel 3a, Chapter 7
+
+use core::mem::size_of;
+
+#[derive(Copy, Clone, Debug)]
+#[repr(C, packed)]
+pub struct TaskStateSegment {
+    pub link: u16,
+    reserved0: u16,
+    pub esp0: u32,
+    pub ss0: u16,
+    reserved1: u16,
+    pub esp1: u32,
+    pub ss1: u16,
+    reserved2: u16,
+    pub esp2: u32,
+    pub ss2: u16,
+    reserved3: u16,
+
+    pub cr3: u32,
+    pub eip: u32,
+    pub eflags: u32,
+
+    pub eax: u32,
+    pub ecx: u32,
+    pub edx: u32,
+    pub ebx: u32,
+    pub esp: u32,
+    pub ebp: u32,
+    pub esi: u32,
+    pub edi: u32,
+
+    pub es: u16,
+    reserved4: u16,
+    pub cs: u16,
+    reserved5: u16,
+    pub ss: u16,
+    reserved6: u16,
+    pub ds: u16,
+    reserved7: u16,
+    pub fs: u16,
+    reserved8: u16,
+    pub gs: u16,
+    reserved9: u16,
+    pub ldtr: u16,
+    reserved10: u32,
+    pub iobp_offset: u16
+}
+
+impl TaskStateSegment {
+    pub fn new() -> TaskStateSegment {
+        TaskStateSegment {
+            link: 0,
+            reserved0: 0,
+            esp0: 0,
+            ss0: 0,
+            reserved1: 0,
+            esp1: 0,
+            ss1: 0,
+            reserved2: 0,
+            esp2: 0,
+            ss2: 0,
+            reserved3: 0,
+            cr3: 0,
+            eip: 0,
+            eflags: 0,
+            eax: 0,
+            ecx: 0,
+            edx: 0,
+            ebx: 0,
+            esp: 0,
+            ebp: 0,
+            esi: 0,
+            edi: 0,
+            es: 0,
+            reserved4: 0,
+            cs: 0,
+            reserved5: 0,
+            ss: 0,
+            reserved6: 0,
+            ds: 0,
+            reserved7: 0,
+            fs: 0,
+            reserved8: 0,
+            gs: 0,
+            reserved9: 0,
+            ldtr: 0,
+            reserved10: 0,
+            iobp_offset: size_of::<TaskStateSegment>() as u16
+        }
+    }
+}