148 lines
No EOL
3.6 KiB
C++
148 lines
No EOL
3.6 KiB
C++
#include <console.hpp>
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#include <kernel/pmm.hpp>
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#include <numeric.hpp>
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#include <pointer.hpp>
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#include <multiboot.hpp>
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#include <kernel/gdt.hpp>
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#include <kernel/idt.hpp>
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#include <io.hpp>
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#include <kernel/vmm.hpp>
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#include <elf.hpp>
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#include <kernel/bsod.hpp>
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#include <asm.hpp>
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#include "driver/timer.hpp"
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#include "driver/keyboard.hpp"
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#include <stdint.h>
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#include <new>
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using namespace multiboot;
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using namespace console_tools;
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struct dummy;
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// Symbols generated by linker, no useful content in there...
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extern dummy kernelStartMarker;
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extern dummy kernelEndMarker;
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driver::Timer timer;
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driver::Keyboard keyboardDriver;
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VMMContext * kernelContext;
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static void initializePMM(Structure const & data)
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{
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for(auto &mmap : data.memoryMaps) {
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if(mmap.length == 0) {
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continue;
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}
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if(mmap.isFree() == false) {
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continue;
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}
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//Console::main
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//<< "mmap: "
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//<< "start: " << hex(mmap.base) << ", length: " << hex(mmap.length)
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//<< ", " << mmap.entry_size
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//<< ", " << sizeof(mmap)
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//<< "\n";
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if(mmap.base > 0xFFFFFFFF) {
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//Console::main << "mmap out of 4 gigabyte range." << "\n";
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continue;
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}
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if(mmap.isFree()) {
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// Mark all free memory free...
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physical_t lower = physical_t(mmap.base).alignUpper(4096);
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physical_t upper = physical_t(mmap.base + mmap.length).alignLower(4096);
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uint32_t ptr = lower.numeric();
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while (ptr < upper.numeric()) {
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PMM::markFree(physical_t(ptr));
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ptr += 0x1000;
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}
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}
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}
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// Mark all memory used by the kernel used...
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physical_t lower = physical_t(&kernelStartMarker).alignLower(4096);
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physical_t upper = physical_t(&kernelEndMarker).alignUpper(4096);
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uint32_t ptr = lower.numeric();
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while (ptr < upper.numeric()) {
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PMM::markUsed(physical_t(ptr));
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ptr += 0x1000;
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}
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// nullptr is not valid.
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PMM::markUsed(physical_t(nullptr));
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// Mark the video memory as used.
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PMM::markUsed(physical_t(0xB8000));
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}
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extern "C" void init(Structure const & data)
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{
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Console::main.clear();
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Console::main
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<< "Hello World!\n"
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<< FColor(Color::Yellow) << "Hello color!" << FColor() << "\n"
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<< BColor(Color::Blue) << "Hello blue!" << BColor() << "\n"
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<< "Hello default color.\n";
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GDT::initialize();
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Console::main
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<< "bootloader name: " << data.bootLoaderName << "\n"
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<< "command line: " << data.commandline << "\n"
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<< "count of modules: " << data.modules.length << "\n"
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<< "count of mmaps: " << data.memoryMaps.length << "\n";
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initializePMM(data);
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auto freeMemory = PMM::getFreeMemory();
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Console::main
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<< "Free: "
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<< (freeMemory >> 20) << "MB, "
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<< (freeMemory >> 10) << "KB, "
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<< (freeMemory >> 0) << "B, "
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<< (freeMemory >> 12) << "Pages\n";
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IDT::initialize();
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Console::main << "Interrupts set up.\n";
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Console::main << "Creating VMM Context...\n";
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kernelContext = new (PMM::alloc().data()) VMMContext();
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Console::main << "Mapping memory...\n";
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for(uint32_t addr = 0; addr < 4096 * 1024; addr += 0x1000) {
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kernelContext->map(
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virtual_t(addr),
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physical_t(addr),
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VMMFlags::Writable | VMMFlags::UserSpace);
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}
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kernelContext->map(
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virtual_t(kernelContext),
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physical_t(kernelContext),
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VMMFlags::Writable);
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Console::main << "Active Context...\n";
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VMM::activate(*kernelContext);
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Console::main << "Active Paging...\n";
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VMM::enable();
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Console::main << "Virtual Memory Management ready.\n";
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timer.install();
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keyboardDriver.install();
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Console::main << "Drivers installed.\n";
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ASM::sti();
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Console::main << "Interrupts enabled.\n";
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while(true);
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}
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static_assert(sizeof(void*) == 4, "Target platform is not 32 bit."); |