kapi/cpu: introduce CPU API

1 files changed, 91 insertions, 34 deletions

diff --git a/arch/x86_64/src/cpu/interrupts.cpp b/arch/x86_64/src/cpu/interrupts.cpp
index 048c461..6f66bbd 100644
--- a/arch/x86_64/src/cpu/interrupts.cpp
+++ b/arch/x86_64/src/cpu/interrupts.cpp
@@ -1,6 +1,7 @@
 #include "arch/cpu/interrupts.hpp"
 
 #include "kapi/cpu.hpp"
+#include "kapi/memory.hpp"
 
 #include "arch/cpu/legacy_pic.hpp"
 #include "arch/cpu/segment_selector.hpp"
@@ -14,38 +15,92 @@ namespace arch::cpu
 
   namespace
   {
-    constexpr auto isr_number_page_fault = 0x0e;
-    constexpr auto isr_number_legacy_start = 0x20;
-    constexpr auto isr_number_legacy_end = 0x29;
-    constexpr auto isr_number_cascade_start = 0x2c;
-    constexpr auto isr_number_cascade_end = 0x2f;
-
-    auto handle_page_fault(interrupt_frame * frame) -> void
+    enum struct exception
     {
-      auto fault_address = std::uintptr_t{};
-      asm volatile("mov %%cr2, %0" : "=r"(fault_address));
-
-      auto const present = (frame->interrupt.error_code & 0x1) != 0;
-      auto const write = (frame->interrupt.error_code & 0x2) != 0;
-      auto const user = (frame->interrupt.error_code & 0x4) != 0;
+      divide_error,
+      debug_exception,
+      non_maskable_interrupt,
+      breakpoint,
+      overflow,
+      bound_range_exceeded,
+      invalid_opcode,
+      device_not_available,
+      double_fault,
+      coprocessor_segment_overrun,
+      invalid_tss,
+      stack_segment_fault,
+      general_protection_fault,
+      page_fault,
+      x87_fpu_floating_point_error,
+      alignment_check,
+      machine_check,
+      simd_floating_point_error,
+      virtualization_exception,
+      control_protection_exception,
+      vmm_communication_exception,
+      security_exception,
+    };
+
+    constexpr auto pic_master_irq_start = 0x20;
+    constexpr auto pic_master_irq_end = pic_master_irq_start + 8;
+    constexpr auto pic_slave_irq_start = pic_master_irq_end;
+    constexpr auto pic_slave_irq_end = pic_slave_irq_start + 8;
+
+    constexpr auto to_exception_type(exception e)
+    {
+      switch (e)
+      {
+        case exception::divide_error:
+        case exception::x87_fpu_floating_point_error:
+        case exception::simd_floating_point_error:
+          return kapi::cpu::exception::type::arithmetic_error;
+        case exception::breakpoint:
+          return kapi::cpu::exception::type::breakpoint;
+        case exception::invalid_opcode:
+          return kapi::cpu::exception::type::illegal_instruction;
+        case exception::stack_segment_fault:
+          return kapi::cpu::exception::type::memory_access_fault;
+        case exception::general_protection_fault:
+          return kapi::cpu::exception::type::privilege_violation;
+        case exception::alignment_check:
+          return kapi::cpu::exception::type::alignment_fault;
+        default:
+          return kapi::cpu::exception::type::unknown;
+      }
+    }
 
-      kstd::println(kstd::print_sink::stderr, "[x86_64:MMU] PAGE FAULT!");
-      kstd::println(kstd::print_sink::stderr, "\tFault address: {:#018x}", fault_address);
-      kstd::println(kstd::print_sink::stderr, "\tPresent: {}", present);
-      kstd::println(kstd::print_sink::stderr, "\tWrite: {}", write);
-      kstd::println(kstd::print_sink::stderr, "\tUser: {}", user);
-      kstd::println(kstd::print_sink::stderr, "\tRIP: {:#018x}", frame->cpu_saved.rip);
-      kstd::println(kstd::print_sink::stderr, "\tHalting the system now!");
+    auto dispatch_exception(interrupt_frame * frame) -> bool
+    {
+      auto type = to_exception_type(static_cast<exception>(frame->interrupt.number));
+      auto fault_address = kapi::memory::linear_address{};
+      auto instruction_pointer = frame->cpu_saved.rip;
 
-      kapi::cpu::halt();
+      switch (type)
+      {
+        case kapi::cpu::exception::type::page_fault:
+        {
+          asm volatile("mov %%cr2, %0" : "=r"(fault_address));
+          auto present = (frame->interrupt.error_code & 0x1) != 0;
+          auto write = (frame->interrupt.error_code & 0x2) != 0;
+          auto user = (frame->interrupt.error_code & 0x4) != 0;
+
+          return kapi::cpu::get_exception_handler().handle(
+              {type, instruction_pointer, fault_address, present, write, user});
+        }
+        default:
+          return kapi::cpu::get_exception_handler().handle({type, instruction_pointer});
+      }
     }
 
     auto handle_legacy_interrupt(interrupt_frame * frame) -> void
     {
       kstd::println("[x86_64:SYS] Ignoring 8259 legacy interrupt {:#04x}", frame->interrupt.number);
 
+      if (frame->interrupt.number >= pic_slave_irq_start)
+      {
+        pic_slave_control_port::write(pic_end_of_interrupt);
+      }
       pic_master_control_port::write(pic_end_of_interrupt);
-      pic_slave_control_port::write(pic_end_of_interrupt);
     }
   }  // namespace
 
@@ -55,23 +110,25 @@ namespace arch::cpu
 
     auto interrupt_dispatch(interrupt_frame * frame) -> void
     {
-      if ((frame->interrupt.number >= isr_number_legacy_start && frame->interrupt.number <= isr_number_legacy_end) ||
-          (frame->interrupt.number >= isr_number_cascade_start && frame->interrupt.number <= isr_number_cascade_end))
+      auto [number, code] = frame->interrupt;
+
+      if (number < pic_master_irq_start && !dispatch_exception(frame))
       {
-        handle_legacy_interrupt(frame);
-        return;
+        kstd::println(kstd::print_sink::stderr,
+                      "[x86_64:CPU] Unhandled exception number {:#04x} received with code {:#04x}", number, code);
+        kapi::cpu::halt();
       }
 
-      switch (frame->interrupt.number)
+      if ((number >= pic_master_irq_start && number < pic_master_irq_end) ||
+          (number >= pic_slave_irq_start && number < pic_slave_irq_end))
       {
-        case isr_number_page_fault:
-          handle_page_fault(frame);
-          break;
-        default:
-          kstd::println(kstd::print_sink::stderr, "[x86_64:SYS] Unhandled interrupt {:#04x} received with code {:#04x}",
-                        frame->interrupt.number, frame->interrupt.error_code);
-          kapi::cpu::halt();
+        handle_legacy_interrupt(frame);
+        return;
       }
+
+      kstd::println(kstd::print_sink::stderr, "[x86_64:CPU] Unhandled interrupt {:#04x} received with code {:#04x}",
+                    frame->interrupt.number, frame->interrupt.error_code);
+      kapi::cpu::halt();
     }
   }