1 files changed, 48 insertions, 0 deletions
diff --git a/kernel/tss.sats b/kernel/tss.sats
new file mode 100644
index 0000000..e5016a8
--- /dev/null
+++ b/kernel/tss.sats
@@ -0,0 +1,48 @@
+#define
+STACK_SIZE 4096
+
+// Stack pointer
+typedef sp_t = @{
+  (* low = uint32, // The higher 32 bits of stack pointer *)
+  (* high = uint32 /// The lower 32 bits of stack pointer *)
+  a = [l : addr] ptr l
+}
+
+// Interrupt Stack table
+typedef ist_t = @{
+  IS1 = sp_t, // Interrupt stack pointer 1
+  IS2 = sp_t, // Interrupt stack pointer 2
+  IS3 = sp_t, // Interrupt stack pointer 3
+  IS4 = sp_t, // Interrupt stack pointer 4
+  IS5 = sp_t, // Interrupt stack pointer 5
+  IS6 = sp_t, // Interrupt stack pointer 6
+  IS7 = sp_t // Interrupt stack pointer 7
+}
+
+// Privilege change stack table
+typedef rst_t = @{
+  RSP0 = sp_t, // Points to stack with privilege level 0
+  RSP1 = sp_t, // Points to stack with privilege level 1
+  RSP2 = sp_t // Points to stack with privilege level 2
+}
+
+// I/O Permission Bitmap
+typedef iopb_t = uint16
+
+//Task state segment
+typedef tss_t = @{
+  r1 = uint32 0, // Reserved space
+  rst = rst_t,  
+  r2 = uint32 0, // Reserved space
+  r3 = uint32 0, // Reserved space
+  ist = ist_t,
+  r4 = uint32 0, // Reserved space
+  r5 = uint32 0, // Reserved space
+  r6 = uint16 0, // Reserved space
+  iopb = iopb_t
+}
+
+typedef stack = @[uint8][STACK_SIZE]
+
+fun tss_init() : void
+