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/* Check if the compiler thinks you are targeting the wrong operating system. */
#if defined(__linux__)
#error "You are not using a cross-compiler"
#endif
/* This tutorial will only work for the 32-bit ix86 targets. */
#if !defined(__i386__)
#error "This tutorial needs to be compiled with a ix86-elf compiler"
#endif
#include <memory.h>
#include <stdlib.h>
#include "cga.h"
#include "cpu/cpu.h"
#include "gdt.h"
#include "idt.h"
#include "keyboard.h"
#include "scheduler.h"
#include "serial.h"
#include "vmm.h"
/* hardware */
vmm kvmm;
#include "hardware.h"
char buffer[4096];
uint32_t check_multiboot(uint32_t, uint32_t);
extern "C" {
void dump_multiboot(uint32_t mb_magic, uint32_t mb_addr);
void dump_gdt();
[[noreturn]] void kernel_main(uint32_t mb_magic, const uint32_t mb_addr) {
#ifdef HAS_SERIAL0
if constexpr (serial0_console)
if (serial0.self_check()) Console::set(&serial0);
#endif
#ifdef HAS_VIDEO0
if (const auto cga_buffer_r = kvmm.map(0xb8000, 0xc03f3000)) {
video0.set_buffer(cga_buffer_r.value());
if constexpr (video0_console) Console::set(&video0);
}
#endif
printk("Hello, kernel World!\n");
CPU core0;
printk("cpuid: ", core0.manufacturer(), " family ", core0.family(), " model ", core0.model(), " stepping ",
core0.stepping(), '\n');
runtime_assert(core0.features().fpu, "CPU lacks fpu");
runtime_assert(core0.features().cx8, "CPU lacks cx8");
dump_address();
dump_gdt();
{
printk("Multiboot2 header at ", uhex{mb_addr}, '\n');
const auto mb_addr_r = kvmm.map(mb_addr, {768, 1020});
runtime_assert(mb_addr_r, "Failed to map mb_addr");
const auto mb_addr_ = mb_addr_r.value();
const auto mb_size = check_multiboot(mb_magic, mb_addr_);
runtime_assert((mb_size != 0), "Invalid multiboot header");
const auto mb_addr_re = [mb_addr, mb_size]() -> Result<uint32_t, vmm::Error> {
if (mb_addr % 4096 + mb_size >= 4096) return kvmm.map((mb_addr % 4096 + 4096), {768, 1021});
return {};
}();
printk("Multiboot2 header mounted at ", uhex{mb_addr}, " size: ", mb_size, '\n');
dump_multiboot(mb_magic, mb_addr_);
if (mb_addr_r) kvmm.unmap(mb_addr_r.value());
if (mb_addr_re) kvmm.unmap(mb_addr_re.value());
}
GDT gdt;
IDT idt{gdt.descriptor(GDT::kcode)};
// Scheduler s{gdt.descriptor(GDT::kcode)};
Keyboard kb;
MemoryAllocator ma(reinterpret_cast<uint32_t>(buffer), sizeof(buffer));
printk("memory free: ", ma.free_space(), '\n');
idt.enable();
while (true) asm volatile("hlt");
}
} // extern "C"
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