old-MTGos-old/kernel/hal/x86/init/idt.cpp

#include <base.hpp>
#include <io.h>
#include <idt.hpp>
#include <serial.hpp>
#include <textDISP.hpp>
#include <vmm3.hpp>
auto syscall(uint32_t syscall_num, void* handle, void* args) -> void*;
extern void** progs;
namespace MTGosHAL {
    IDT::IDT() {
        //Init PIC
        outb(0x20, 0x11); //Init Master-PIC
        outb(0x21, 0x20); //Interrupt number for IRQ0
        outb(0x21, 0x04); //IRQ is the Slave
        outb(0x21, 0x01); //ICW 4
        outb(0xA0, 0x11); //Init Master-PIC
        outb(0xA1, 0x28); //Interrupt number for IRQ8
        outb(0xA1, 0x02); //IRQ is the Slave
        outb(0xA1, 0x01); //ICW 4
        //Activate IRQ's
        outb(0x21, 0x00);
        outb(0xA1, 0x00);
    }
    auto IDT::setEntry(int i, void* offset, uint16_t seg, uint8_t flags) -> void {
        idt[i]=(uint16_t)((uint32_t)offset);
        idt[i]|=(uint64_t)(((uint32_t)offset)>>16)<<48;
        idt[i]|=((uint64_t)seg)<<16;
        idt[i]|=((uint64_t)flags)<<40;
    }
    auto IDT::apply() -> void {
        debug << "Now trying to load the IDT.\n";
        idtptr.limit=(uint16_t)(256*8-1);
        idtptr.pointer=(uint64_t*)&idt;
        loadIDT((void*)&idtptr);
    }
    auto IDT::handle(struct cpu_state* cpu) -> struct cpu_state* {
    struct cpu_state* new_cpu=cpu;
        debug << "Interrupt 0x" << Base::HEXADECIMAL << (int) cpu->intr << " was raised.\n";
        if(cpu->intr<=0x1F) {
            err << "Exception 0x" << Base::HEXADECIMAL << (int) cpu->intr << "! Kernel halted!\n";
            err << "EAX = 0x" << (int)cpu->eax << " - EBX = 0x" << (int)cpu->ebx << "\n";
            err << "ECX = 0x" << (int)cpu->ecx << " - EDX = 0x" << (int)cpu->edx << "\n";
            err << "ESI = 0x" << (int)cpu->esi << " - EDI = 0x" << (int)cpu->edi << "\n";
            err << "SS:ESP = 0x" << (int)cpu->ss << ":0x" << (int)cpu->esp << " - SS:EBP = 0x" << (int)cpu->ss << ":0x" << (int)cpu->ebp << "\n";
            err << "CS:EIP = 0x" << (int)cpu->cs << ":0x" << (int)cpu->eip << " - INTR:ERR = 0x" << (int)cpu->intr << ":0x" << (int)cpu->error << "\n";
            err << "------ END OF REGISTER DUMP ------   ------ START OF PROGRAM LOADPOINTS ------\n";
            for(int i=0;i<1024;i++) {
                if(!progs[i])
                    break;
                err << "0x" << (int)((uint32_t)progs[i]) << "; ";
            }
            err << "\n";
            uint16_t counter = 1193180 / 220; //Make an annoying beep
            outb(0x43, 0xB6);
            outb(0x42, (uint8_t)counter);
            outb(0x42, (uint8_t)(counter>>8));
            outb(0x61, inb(0x61) | 3);
            while(1) {
                asm volatile("cli; hlt");
            }
        } else if(cpu->intr >= 0x20 && cpu->intr <= 0x2F) {
            if(cpu->intr >= 0x28) {
                outb(0xA0, 0x20);
            }
            outb(0x20, 0x20);
            debug << "The IRQ " << Base::DECIMAL << (int) cpu->intr-0x20 << " was handled.\n";
            if(cpu->intr==0x20) {
                debug.debug();
            }
        }
        for(int i=0;i<16;i++) {
            if(ivt[cpu->intr][i])
                new_cpu=ivt[cpu->intr][i](new_cpu);
        }
        if(cpu->intr>=48)
            new_cpu->eax=(uint32_t)(::syscall(cpu->eax, (void*)(cpu->ebx), (void*)(cpu->esp)));
        return new_cpu;
    }
    auto IDT::request(uint8_t intr, struct cpu_state* (*handler)(struct cpu_state*)) -> bool {
        for(int i=0;i<16;i++) {
            if(ivt[intr][i])
                continue;
            ivt[intr][i]=handler;
            return true;
        }
        return false;
    }
}
extern "C" void* handleINT(void* cpu) {
    return (void*)MTGosHAL::idt.handle((MTGosHAL::cpu_state*)cpu);
}