old-DasOS/prototypes/base/init.cpp

228 lines
No EOL
5.5 KiB
C++

#include "console.hpp"
#include "pmm.hpp"
#include "numeric.hpp"
#include "pointer.hpp"
#include "multiboot.hpp"
#include "gdt.hpp"
#include "idt.hpp"
#include "compat.h"
#include "io.hpp"
#include "vmm.hpp"
#include "elf.hpp"
#include "bsod.hpp"
#include "asm.hpp"
#include "driver/timer.hpp"
#include "driver/keyboard.hpp"
#include <inttypes.h>
#include <new>
#include <string.h>
using namespace multiboot;
using namespace console_tools;
struct dummy;
// Symbols generated by linker, no useful content in there...
extern dummy kernelStartMarker;
extern dummy kernelEndMarker;
driver::Timer timer;
driver::Keyboard keyboardDriver;
VMMContext * kernelContext;
static const uint32_t entryPointAddress = 0x40000000;
void run_program0(Module const & module)
{
using namespace elf;
const Header *header = module.start.data<elf::Header>();
ProgramHeader *ph;
int i;
if (header->magic != MAGIC) {
BSOD::die(Error::InvalidELFImage, "Keine gueltige ELF-Magic!\n");
return;
}
ph = (ProgramHeader*)(((char*) header) + header->ph_offset);
for (i = 0; i < header->ph_entry_count; i++, ph++) {
void* dest = (void*) ph->virt_addr;
void* src = ((char*) header) + ph->offset;
/* Nur Program Header vom Typ LOAD laden */
if (ph->type != 1) {
continue;
}
if(ph->virt_addr < entryPointAddress) {
BSOD::die(Error::InvalidELFImage, "A LOAD section tried to sneak into the kernel!");
}
for(uint32_t i = 0; i < ph->mem_size; i += 0x1000) {
kernelContext->provide(
virtual_t(ph->virt_addr + i),
VMMFlags::Writable | VMMFlags::UserSpace);
}
memset(dest, 0, ph->mem_size);
memcpy(dest, src, ph->file_size);
}
using EntryPoint = void (*)();
EntryPoint ep = (EntryPoint)entryPointAddress;
ep();
}
static void dump_elf(elf::Header *header)
{
using namespace elf;
ProgramHeader *ph;
int i;
/* Ist es ueberhaupt eine ELF-Datei? */
if (header->magic != MAGIC) {
BSOD::die(Error::InvalidELFImage, "Keine gueltige ELF-Magic!\n");
return;
}
ph = (ProgramHeader*)(((char*) header) + header->ph_offset);
for (i = 0; i < header->ph_entry_count; i++, ph++) {
void* dest = (void*) ph->virt_addr;
void* src = ((char*) header) + ph->offset;
Console::main
<< "Header: " << ph->type << ", "
<< "Source: " << src << ", "
<< "Dest: " << dest << ", "
<< "Memsize: " << ph->mem_size << ", "
<< "Filesize: " << ph->file_size
<< "\n";
}
}
static void initializePMM(Structure const & data)
{
for(auto &mmap : data.memoryMaps) {
if(mmap.length == 0) {
continue;
}
if(mmap.isFree() == false) {
continue;
}
//Console::main
//<< "mmap: "
//<< "start: " << hex(mmap.base) << ", length: " << hex(mmap.length)
//<< ", " << mmap.entry_size
//<< ", " << sizeof(mmap)
//<< "\n";
if(mmap.base > 0xFFFFFFFF) {
//Console::main << "mmap out of 4 gigabyte range." << "\n";
continue;
}
if(mmap.isFree()) {
// Mark all free memory free...
physical_t lower = physical_t(mmap.base).alignUpper(4096);
physical_t upper = physical_t(mmap.base + mmap.length).alignLower(4096);
uint32_t ptr = lower.numeric();
while (ptr < upper.numeric()) {
PMM::markFree(physical_t(ptr));
ptr += 0x1000;
}
}
}
// Mark all memory used by the kernel used...
physical_t lower = physical_t(&kernelStartMarker).alignLower(4096);
physical_t upper = physical_t(&kernelEndMarker).alignUpper(4096);
uint32_t ptr = lower.numeric();
while (ptr < upper.numeric()) {
PMM::markUsed(physical_t(ptr));
ptr += 0x1000;
}
// nullptr is not valid.
PMM::markUsed(physical_t(nullptr));
// Mark the video memory as used.
PMM::markUsed(physical_t(0xB8000));
}
extern "C" void init(Structure const & data)
{
Console::main
<< "Hello World!\n"
<< FColor(Color::Yellow) << "Hello color!" << FColor() << "\n"
<< BColor(Color::Blue) << "Hello blue!" << BColor() << "\n"
<< "Hello default color.\n";
GDT::initialize();
Console::main
<< "bootloader name: " << data.bootLoaderName << "\n"
<< "command line: " << data.commandline << "\n"
<< "count of modules: " << data.modules.length << "\n"
<< "count of mmaps: " << data.memoryMaps.length << "\n";
initializePMM(data);
auto freeMemory = PMM::getFreeMemory();
Console::main
<< "Free: "
<< (freeMemory >> 20) << "MB, "
<< (freeMemory >> 10) << "KB, "
<< (freeMemory >> 0) << "B, "
<< (freeMemory >> 12) << "Pages\n";
IDT::initialize();
Console::main << "Interrupts set up.\n";
Console::main << "Creating VMM Context...\n";
kernelContext = new (PMM::alloc().data()) VMMContext();
Console::main << "Mapping memory...\n";
for(uint32_t addr = 0; addr < 4096 * 1024; addr += 0x1000) {
kernelContext->map(
virtual_t(addr),
physical_t(addr),
VMMFlags::Writable | VMMFlags::UserSpace);
}
kernelContext->map(
virtual_t(kernelContext),
physical_t(kernelContext),
VMMFlags::Writable);
Console::main << "Active Context...\n";
VMM::activate(*kernelContext);
Console::main << "Active Paging...\n";
VMM::enable();
Console::main << "Virtual Memory Management ready.\n";
timer.install();
keyboardDriver.install();
Console::main << "Drivers installed.\n";
//asm volatile("sti");
ASM::sti();
Console::main << "Interrupts enabled.\n";
if(data.modules.length > 0)
{
Console::main << "ELF Modukle:\n";
dump_elf(data.modules[0].start.data<elf::Header>());
run_program0(data.modules[0]);
}
while(true);
}
static_assert(sizeof(void*) == 4, "Target platform is not 32 bit.");