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// Copyright 2024-2025, Amlal El Mahrouss (amlal@nekernel.org)
// Licensed under the Apache License, Version 2.0 (see LICENSE file)
// Official repository: https://github.com/ne-foss-org/nekernel
#include <ArchKit/ArchKit.h>
#include <KernelKit/ProcessScheduler.h>
#include <KernelKit/UserMgr+User.h>
#include <NeKit/Atom.h>
#include <NeKit/KString.h>
#include <SignalKit/Signals.h>
EXTERN_C Kernel::Void idt_handle_breakpoint(Kernel::UIntPtr rip);
EXTERN_C Kernel::UIntPtr kApicBaseAddress;
STATIC BOOL kIsRunning{NO};
/// @brief Notify APIC and PIC that we're done with the interrupt.
/// @note
static void hal_idt_send_eoi(UInt8 vector) {
((volatile UInt32*) kApicBaseAddress)[0xB0 / 4] = 0;
if (vector >= kPICCommand && vector <= 0x2F) {
if (vector >= 0x28) {
Kernel::HAL::rt_out8(kPIC2Command, kPICCommand);
}
Kernel::HAL::rt_out8(kPICCommand, kPICCommand);
}
}
/// @brief Handle GPF fault.
/// @param rsp
EXTERN_C Kernel::Void idt_handle_gpf(Kernel::UIntPtr rsp) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(13);
if (process) {
process.Signal.SignalArg = rsp;
process.Signal.SignalID = SIGKILL;
process.Signal.Status = process.Status;
}
}
/// @brief Handle page fault.
/// @param rsp
EXTERN_C void idt_handle_pf(Kernel::UIntPtr rsp) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(14);
if (process) {
process.Signal.SignalArg = rsp;
process.Signal.SignalID = SIGKILL;
process.Signal.Status = process.Status;
}
}
/// @brief Handle scheduler interrupt.
EXTERN_C void idt_handle_scheduler(Kernel::UIntPtr rsp) {
NE_UNUSED(rsp);
hal_idt_send_eoi(32);
while (kIsRunning);
kIsRunning = YES;
Kernel::UserProcessHelper::StartScheduling();
kIsRunning = NO;
}
/// @brief Handle math fault.
/// @param rsp
EXTERN_C void idt_handle_math(Kernel::UIntPtr rsp) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(8);
if (process) {
process.Signal.SignalArg = rsp;
process.Signal.SignalID = sig_generate_unique<SIGKILL>();
process.Signal.Status = process.Status;
}
}
/// @brief Handle any generic fault.
/// @param rsp
EXTERN_C void idt_handle_generic(Kernel::UIntPtr rsp) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(30);
Kernel::kout << "Kernel: Generic Process Fault.\r";
process.Signal.SignalArg = rsp;
process.Signal.SignalID = sig_generate_unique<SIGSEG>();
;
process.Signal.Status = process.Status;
Kernel::kout << "Kernel: SIGKILL status.\r";
}
EXTERN_C Kernel::Void idt_handle_breakpoint(Kernel::UIntPtr rip) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(3);
process.Signal.SignalArg = rip;
process.Signal.SignalID = sig_generate_unique<SIGTRAP>();
process.Signal.Status = process.Status;
process.Status = Kernel::ProcessStatusKind::kFrozen;
}
/// @brief Handle #UD fault.
/// @param rsp
EXTERN_C void idt_handle_ud(Kernel::UIntPtr rsp) {
auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
if (process) process.Crash();
hal_idt_send_eoi(6);
process.Signal.SignalArg = rsp;
process.Signal.SignalID = sig_generate_unique<SIGKILL>();
process.Signal.Status = process.Status;
}
/// @brief Enter syscall from assembly (libSystem only)
/// @param stack the stack pushed from assembly routine.
/// @return nothing.
EXTERN_C Kernel::Void hal_system_call_enter(Kernel::UIntPtr rcx_hash,
Kernel::UIntPtr rdx_syscall_arg) {
hal_idt_send_eoi(50);
if (!Kernel::kCurrentUser) return;
for (SizeT i = 0UL; i < kMaxDispatchCallCount; ++i) {
if (kSysCalls[i].fHooked && rcx_hash == kSysCalls[i].fHash) {
if (kSysCalls[i].fProc) {
(kSysCalls[i].fProc)((Kernel::VoidPtr) rdx_syscall_arg);
}
}
}
}
/// @brief Enter Kernel call from assembly (libDDK only).
/// @param stack the stack pushed from assembly routine.
/// @return nothing.
EXTERN_C Kernel::Void hal_kernel_call_enter(Kernel::UIntPtr rcx_hash, Kernel::SizeT cnt,
Kernel::UIntPtr arg, Kernel::SizeT sz) {
hal_idt_send_eoi(51);
if (!Kernel::kRootUser) return;
if (Kernel::kCurrentUser != Kernel::kRootUser) return;
if (!Kernel::kCurrentUser->IsSuperUser()) return;
for (SizeT i = 0UL; i < kMaxDispatchCallCount; ++i) {
if (kKernCalls[i].fHooked && rcx_hash == kKernCalls[rcx_hash].fHash) {
if (kKernCalls[i].fProc) {
(kKernCalls[i].fProc)(cnt, (Kernel::VoidPtr) arg, sz);
}
}
}
}
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