Refactor and implement interrupt handling and PIT driver

- Refactored CPU context structure for better readability.
- Enhanced corpse and exception structures with clearer formatting.
- Improved frame structure for consistency.
- Added interrupt flag operations for enabling and disabling interrupts.
- Implemented IDT (Interrupt Descriptor Table) operations including loading and setting gates.
- Created PIC (Programmable Interrupt Controller) initialization and masking functions.
- Developed PIT (Programmable Interval Timer) driver with initialization and handler functions.
- Established common interrupt handler structure and exception handling stubs.
- Added hardware IRQ handling for IRQs 0-15.
- Introduced IDT entry and gate descriptor types for better organization.
- Ensured proper handling of interrupt and exception vectors.

1 files changed, 22 insertions, 7 deletions

diff --git a/mirai/crimson/classify/analyze.zig b/mirai/crimson/classify/analyze.zig
index e4287a4..b7c9818 100644
--- a/mirai/crimson/classify/analyze.zig
+++ b/mirai/crimson/classify/analyze.zig
@@ -1,16 +1,29 @@
 //! Analyze Error Codes
 
 pub const PageFaultError = struct {
-    present: bool, write: bool, user: bool, reserved_write: bool, instruction_fetch: bool,
+    present: bool,
+    write: bool,
+    user: bool,
+    reserved_write: bool,
+    instruction_fetch: bool,
     pub fn from_error_code(code: u64) PageFaultError {
         return PageFaultError{
-            .present = (code & 1) != 0, .write = (code & 2) != 0, .user = (code & 4) != 0,
-            .reserved_write = (code & 8) != 0, .instruction_fetch = (code & 16) != 0,
+            .present = (code & 1) != 0,
+            .write = (code & 2) != 0,
+            .user = (code & 4) != 0,
+            .reserved_write = (code & 8) != 0,
+            .instruction_fetch = (code & 16) != 0,
         };
     }
-    pub fn is_not_present(self: PageFaultError) bool { return !self.present; }
-    pub fn is_write_access(self: PageFaultError) bool { return self.write; }
-    pub fn is_execute_access(self: PageFaultError) bool { return self.instruction_fetch; }
+    pub fn is_not_present(self: PageFaultError) bool {
+        return !self.present;
+    }
+    pub fn is_write_access(self: PageFaultError) bool {
+        return self.write;
+    }
+    pub fn is_execute_access(self: PageFaultError) bool {
+        return self.instruction_fetch;
+    }
     pub fn description(self: PageFaultError) []const u8 {
         if (self.instruction_fetch) return if (self.present) "Execute on non-executable page" else "Execute on non-present page";
         if (self.write) return if (self.present) "Write to read-only page" else "Write to non-present page";
@@ -19,7 +32,9 @@ pub const PageFaultError = struct {
 };
 
 pub const SelectorError = struct {
-    external: bool, table: u2, index: u13,
+    external: bool,
+    table: u2,
+    index: u13,
     pub fn from_error_code(code: u64) SelectorError {
         return SelectorError{ .external = (code & 1) != 0, .table = @truncate((code >> 1) & 0x3), .index = @truncate((code >> 3) & 0x1FFF) };
     }