feat: kernel: stability improvements on the scheduler and AMD64 HAL.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

3 files changed, 48 insertions, 19 deletions

diff --git a/src/kernel/HALKit/AMD64/HalCommonAPI.asm b/src/kernel/HALKit/AMD64/HalCommonAPI.asm
index 144e5e7a..f571aba7 100644
--- a/src/kernel/HALKit/AMD64/HalCommonAPI.asm
+++ b/src/kernel/HALKit/AMD64/HalCommonAPI.asm
@@ -92,7 +92,7 @@ sched_jump_to_task:
     push rbp
     mov  rbp, rsp
 
-    mov ax, 0x30
+    mov ax, 0x33
     mov ds, ax
     mov es, ax
     mov fs, ax
@@ -101,11 +101,11 @@ sched_jump_to_task:
     mov ax, 0x18
     ltr ax
 
-    push 0x30
+    push 0x33
     mov rdx, [rcx + 0x08]
     push rdx
     o64 pushf
-    push 0x28
+    push 0x2B
     mov rdx, [rcx + 0x00]
     push rdx
 
diff --git a/src/kernel/HALKit/AMD64/HalCoreInterruptHandler.cc b/src/kernel/HALKit/AMD64/HalCoreInterruptHandler.cc
index 14ec5f60..040f5daa 100644
--- a/src/kernel/HALKit/AMD64/HalCoreInterruptHandler.cc
+++ b/src/kernel/HALKit/AMD64/HalCoreInterruptHandler.cc
@@ -31,26 +31,32 @@ static void hal_idt_send_eoi(UInt8 vector) {
 /// @param rsp
 EXTERN_C Kernel::Void idt_handle_gpf(Kernel::UIntPtr rsp) {
   auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
-  process.Crash();
+
+  if (process) process.Crash();
 
   hal_idt_send_eoi(13);
 
-  process.Signal.SignalArg = rsp;
-  process.Signal.SignalID  = SIGKILL;
-  process.Signal.Status    = process.Status;
+  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();
-  process.Crash();
+
+  if (process) process.Crash();
 
   hal_idt_send_eoi(14);
 
-  process.Signal.SignalArg = rsp;
-  process.Signal.SignalID  = SIGKILL;
-  process.Signal.Status    = process.Status;
+  if (process) {
+    process.Signal.SignalArg = rsp;
+    process.Signal.SignalID  = SIGKILL;
+    process.Signal.Status    = process.Status;
+  }
 }
 
 /// @brief Handle scheduler interrupt.
@@ -73,21 +79,24 @@ EXTERN_C void idt_handle_scheduler(Kernel::UIntPtr rsp) {
 /// @param rsp
 EXTERN_C void idt_handle_math(Kernel::UIntPtr rsp) {
   auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
-  process.Crash();
+
+  if (process) process.Crash();
 
   hal_idt_send_eoi(8);
 
-  process.Signal.SignalArg = rsp;
-  process.Signal.SignalID  = sig_generate_unique<SIGKILL>();
-  ;
-  process.Signal.Status = process.Status;
+  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();
-  process.Crash();
+
+  if (process) process.Crash();
 
   hal_idt_send_eoi(30);
 
@@ -104,6 +113,8 @@ EXTERN_C void idt_handle_generic(Kernel::UIntPtr rsp) {
 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;
@@ -118,7 +129,8 @@ EXTERN_C Kernel::Void idt_handle_breakpoint(Kernel::UIntPtr rip) {
 /// @param rsp
 EXTERN_C void idt_handle_ud(Kernel::UIntPtr rsp) {
   auto process = Kernel::UserProcessScheduler::The().TheCurrentProcess();
-  process.Crash();
+
+  if (process) process.Crash();
 
   hal_idt_send_eoi(6);
 
diff --git a/src/kernel/HALKit/AMD64/HalInterruptAPI.asm b/src/kernel/HALKit/AMD64/HalInterruptAPI.asm
index c761684e..be8675f8 100644
--- a/src/kernel/HALKit/AMD64/HalInterruptAPI.asm
+++ b/src/kernel/HALKit/AMD64/HalInterruptAPI.asm
@@ -206,7 +206,24 @@ __NE_INT_32:
 
     o64 iret
 
-IntNormal 33
+global __NE_INT_33
+__NE_INT_33:
+    cli
+
+    push rax
+
+    ; Read scancode from keyboard port to acknowledge
+    in al, 0x60
+
+    ; Send EOI to master PIC
+    mov al, 0x20
+    out 0x20, al
+
+    pop rax
+
+    std
+
+    o64 iret
 
 IntNormal 34
 IntNormal 35