From 6da213d840f07a2921091a6d2fab7efa5ec5cdfa Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sun, 29 Sep 2024 08:03:04 -0400
Subject: enter user mode

---
 idt.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'idt.cpp')

diff --git a/idt.cpp b/idt.cpp
index 0dc0f73..c889c14 100644
--- a/idt.cpp
+++ b/idt.cpp
@@ -8,6 +8,8 @@
 
 extern TextOutput& term;
 
+static constexpr unsigned InterruptCount = 49;
+
 static constexpr std::uint8_t TaskGate   = 0x5;
 static constexpr std::uint8_t IntrGate16 = 0x6;
 static constexpr std::uint8_t TrapGate16 = 0x7;
@@ -25,7 +27,7 @@ struct idt_entry_bits {
     std::uint32_t offset_high            : 16;
 } __attribute__((packed));
 
-static std::array<Callback, 48> callbacks;
+static std::array<Callback, InterruptCount> callbacks;
 
 extern "C"
 void interruptGeneralHandler(Registers regs)
@@ -91,10 +93,12 @@ struct StubEntry
 static auto idt =
     []<std::size_t... ints>(std::index_sequence<ints...>) {
         return std::array<idt_entry_bits, 256> { StubEntry<ints>()... };
-    }(std::make_index_sequence<48>{});
+    }(std::make_index_sequence<InterruptCount>{});
 
 void idt_initialize()
 {
+    idt[0x28].dpl = 3;
+
     auto idtr = reinterpret_cast<std::uint64_t>(idt.data());
     idtr <<= 16;
     idtr |= idt.size() * sizeof(idt[0]);
-- 
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