diff options
| author | Clyne Sullivan <clyne@bitgloo.com> | 2024-09-30 11:08:46 -0400 |
|---|---|---|
| committer | Clyne Sullivan <clyne@bitgloo.com> | 2024-09-30 11:08:46 -0400 |
| commit | 19d9a04e36e7fb96eebe89e24311408460c29a70 (patch) | |
| tree | 4d5f5ba595d5a5e2b59ce7b102c06b77c7be7721 /idt.cpp | |
| parent | 85c8fd05f1a0c0224882c4fafa60003d3ef56cf3 (diff) | |
reorganize files
Diffstat (limited to 'idt.cpp')
| -rw-r--r-- | idt.cpp | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/idt.cpp b/idt.cpp deleted file mode 100644 index 5380c9e..0000000 --- a/idt.cpp +++ /dev/null @@ -1,126 +0,0 @@ -#include "idt.hpp" -#include "portio.hpp" -#include "textoutput.hpp" - -#include <array> -#include <cstdint> -#include <utility> - -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; -static constexpr std::uint8_t IntrGate32 = 0xE; -static constexpr std::uint8_t TrapGate32 = 0xF; - -struct idt_entry_bits { - std::uint32_t offset_low : 16; - std::uint32_t segment_selector : 16; - std::uint32_t rsvd : 8 = 0; - std::uint32_t gate_type : 4; - std::uint32_t rsvd2 : 1 = 0; - std::uint32_t dpl : 2; - std::uint32_t present : 1; - std::uint32_t offset_high : 16; -} __attribute__((packed)); - -static std::array<Callback, InterruptCount> callbacks; - -extern "C" -void interruptGeneralHandler(Registers regs) -{ - const auto& inum = regs.inum; - - if (inum >= 32) { - if (inum >= 40) - outb(0xA0, 0x20); - - outb(0x20, 0x20); - } - - if (inum < callbacks.size()) { - if (auto cb = callbacks[inum]; cb) { - asm volatile("cli"); - cb(regs); - asm volatile("sti"); - } - } -} - -template<std::size_t N> -struct StubEntry -{ - static constexpr bool HasError = N == 8 || (N >= 10 && N <= 14) || N == 17 || N == 30; - - __attribute__((naked)) - static void stub() { - if constexpr (!HasError) - asm volatile("push $0x0"); - - asm volatile(R"( - pusha - mov %%ds, %%eax - push %%eax - mov $0x10, %%ax - mov %%ax, %%ds - mov %%ax, %%es - mov %%ax, %%fs - mov %%ax, %%gs - push %0 - cld - call interruptGeneralHandler - pop %%eax - pop %%eax - mov %%ax, %%ds - mov %%ax, %%es - mov %%ax, %%fs - mov %%ax, %%gs - popa - add $0x4, %%esp - iret - )" :: "i"(N)); - } - - static constexpr std::uint32_t segment(std::uint16_t gdt_idx, bool useLdt, std::uint16_t rpl) { - return gdt_idx | (useLdt ? 0x4 : 0x0) | (rpl & 0x3); - } - - idt_entry_bits entry = { - .offset_low = (uint32_t)stub & 0xFFFF, - .segment_selector = segment(0x8, false, 0), - .gate_type = IntrGate32, - .dpl = 0, - .present = 1, - .offset_high = (uint32_t)stub >> 16 - }; - - operator idt_entry_bits() const noexcept { - return entry; - } -}; - -static auto idt = - []<std::size_t... ints>(std::index_sequence<ints...>) { - return std::array<idt_entry_bits, 256> { StubEntry<ints>()... }; - }(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]); - - asm volatile("lidt %0" :: "m"(idtr)); -} - -void idt_register_callback(std::size_t num, Callback cb) -{ - if (num < callbacks.size()) - callbacks[num] = cb; -} - |