79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
#include <base.hpp>
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#include <output.hpp>
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#include <serial.hpp>
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#include <textDISP.hpp>
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#include <gdt.hpp>
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#include <idt.hpp>
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#include <keyboard.hpp>
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#include <Multitasking.hpp>
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#include <multiboot.h>
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#include <blockdev.hpp>
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#include <qdpmm.hpp>
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extern "C" void intr_stub_0(void);
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void main(void ** programs);
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namespace MTGosHAL {
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Serial debug;
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Screen out;
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Screen err;
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Keyboard in;
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IDT idt;
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GDT gdt;
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Multitasking tasks;
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BlockDevice disk;
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QDPMM qdmm;
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void main(int eax, struct multiboot_info* ebx) {
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out << BG_color::BLACK << FG_color::WHITE << "Loading MTGos...\n";
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err << BG_color::BLACK << FG_color::RED;
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if(eax!=0x2BADB002)
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err << "System wasn't loaded by a Multiboot-conformant launcher!\n";
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debug << "Hello debugger! This is MTGos v00r01\nThese logs are probably very long, so please redirect the output to a file.\n";
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gdt.setEntry(0, 0, 0, 0);
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gdt.setEntry(1, 0, 0xfffff, GDT_FLAG_SEGMENT | GDT_FLAG_32_BIT | GDT_FLAG_CODESEG | GDT_FLAG_4K_GRAN | GDT_FLAG_PRESENT);
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gdt.setEntry(2, 0, 0xfffff, GDT_FLAG_SEGMENT | GDT_FLAG_32_BIT | GDT_FLAG_DATASEG | GDT_FLAG_4K_GRAN | GDT_FLAG_PRESENT);
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gdt.setEntry(3, 0, 0xfffff, GDT_FLAG_SEGMENT | GDT_FLAG_32_BIT | GDT_FLAG_CODESEG | GDT_FLAG_4K_GRAN | GDT_FLAG_PRESENT | GDT_FLAG_RING3);
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gdt.setEntry(4, 0, 0xfffff, GDT_FLAG_SEGMENT | GDT_FLAG_32_BIT | GDT_FLAG_DATASEG | GDT_FLAG_4K_GRAN | GDT_FLAG_PRESENT | GDT_FLAG_RING3);
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gdt.setEntry(5, (uint32_t)tasks.tss, sizeof(tasks.tss), GDT_FLAG_RING3 | GDT_FLAG_TSS | GDT_FLAG_PRESENT);
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gdt.setEntry(6, 0, 0xfffff, GDT_FLAG_RING3 | GDT_FLAG_TSS | GDT_FLAG_PRESENT);
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gdt.apply();
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asm volatile("ltr %%ax" : : "a"(5<<3));
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debug << "We are now creating the IDT.\n";
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for(int i=0;i<256;i++) {
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idt.setEntry(i, (void *)((uint32_t)&intr_stub_0+i*16), SEG_KERNEL, IDT_INTERRUPT_GATE | IDT_SEG_32_BIT | IDT_RING_0 | IDT_USED);
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}
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idt.setEntry(48, (void *)((uint32_t)&intr_stub_0+768), SEG_KERNEL, IDT_TRAP_GATE | IDT_SEG_32_BIT | IDT_RING_0 | IDT_USED);
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idt.setEntry(8, (void *)((uint32_t)&intr_stub_0+128), SEG_DBL_FAULT, IDT_TASK_GATE | IDT_SEG_32_BIT | IDT_RING_0 | IDT_USED);
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idt.apply();
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qdmm.init(ebx);
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multiboot_mod_list *mods = (multiboot_mod_list*) ebx->mods_addr;
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void** progs=nullptr;
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void* tmp;
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qdmm >> tmp;
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progs=(void**)tmp;
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uint32_t i;
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for(i=0;i<(ebx->mods_count<1023?ebx->mods_count:1023);i++) { //Basically until MIN(ebx->mods_count, 1023), as we only support loading up to 1023 programs directly.
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progs[i]=(void*)(mods[i].mod_start);
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debug << "Found module!\n";
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}
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i++;
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progs[i]=nullptr;
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::main(progs);
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sti();
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for(;;);
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}
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}
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typedef void (*constructor)();
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typedef void (*destructor)();
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extern "C" constructor start_ctors;
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extern "C" constructor end_ctors;
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extern "C" destructor start_dtors;
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extern "C" destructor end_dtors;
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extern "C" void init(int eax, struct multiboot_info* ebx) {
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for(constructor* i = &start_ctors; i != &end_ctors; ++i)
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(*i)();
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MTGosHAL::main(eax, ebx);
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for(destructor* i = &start_dtors; i != &end_dtors; i++)
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(*i)();
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}
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extern "C" void __cxa_pure_virtual() {
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MTGosHAL::debug << "A pure virtual function just got called.\n";
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}
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