121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
#include "ELF.h"
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#include "InitRD.h"
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#include "Log.h"
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#include "arch/CPU.h"
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#include "arch/MMU.h"
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#include "arch/PCI.h"
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#include "arch/Timer.h"
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#include "boot/Init.h"
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#include "config.h"
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#include "memory/Heap.h"
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#include "memory/KernelVM.h"
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#include "memory/MemoryManager.h"
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#include "thread/Scheduler.h"
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#include <luna/CString.h>
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#include <luna/Result.h>
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#include <luna/Units.h>
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void heap_thread()
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{
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CPU::disable_interrupts();
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dump_heap_usage();
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kdbgln("Kernel uses %lu vm pages", KernelVM::used() / ARCH_PAGE_SIZE);
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kernel_exit();
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}
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void reap_thread()
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{
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while (true)
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{
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CPU::disable_interrupts();
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auto dying_threads = Scheduler::check_for_dying_threads();
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CPU::enable_interrupts();
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dying_threads.consume([](Thread* thread) { Scheduler::reap_thread(thread); });
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kernel_sleep(250);
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}
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}
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Result<void> init()
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{
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kinfoln("Starting Moon %s, built on %s at %s", MOON_VERSION, __DATE__, __TIME__);
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kinfoln("Current platform: %s", CPU::platform_string());
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kinfoln("Current processor: %s", CPU::identify().value_or("(unknown)"));
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Timer::init();
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kinfoln("Total memory: %s", to_dynamic_unit(MemoryManager::total()).release_value().chars());
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kinfoln("Free memory: %s", to_dynamic_unit(MemoryManager::free()).release_value().chars());
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kinfoln("Used memory: %s", to_dynamic_unit(MemoryManager::used()).release_value().chars());
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kinfoln("Reserved memory: %s", to_dynamic_unit(MemoryManager::reserved()).release_value().chars());
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Thread::init();
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Scheduler::init();
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TarStream::Entry entry;
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while (TRY(g_initrd.read_next_entry(entry)))
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{
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if (entry.type == TarStream::EntryType::RegularFile)
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{
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kinfoln("Found file %s in initial ramdisk, of size %s and mode %#ho", entry.name,
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to_dynamic_unit(entry.size).release_value().chars(), entry.mode);
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if (!strcmp(entry.name, "bin/app")) { TRY(Scheduler::new_userspace_thread(entry, g_initrd)); }
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}
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}
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TRY(Scheduler::new_kernel_thread(heap_thread));
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TRY(Scheduler::new_kernel_thread(reap_thread));
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PCI::scan(
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[](const PCI::Device& device) {
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kinfoln("Found PCI mass storage device %.4x:%.4x, at address %u:%u:%u", device.id.vendor, device.id.device,
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device.address.bus, device.address.slot, device.address.function);
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},
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{ .klass = 1 });
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CPU::platform_finish_init();
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// Disable console logging before transferring control to userspace.
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setup_log(log_debug_enabled(), log_serial_enabled(), false);
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CPU::enable_interrupts();
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return {};
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}
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[[noreturn]] void init_wrapper()
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{
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auto rc = init();
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if (rc.has_error()) kerrorln("Runtime error: %s", rc.error_string());
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CPU::idle_loop();
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}
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static constexpr u64 BOOTSTRAP_STACK_PAGES = 8;
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// FIXME: Reclaim this memory as soon as we leave the init task (so as soon as the Scheduler runs a task switch)
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static u64 allocate_initial_kernel_stack()
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{
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u64 address = MemoryManager::alloc_for_kernel(BOOTSTRAP_STACK_PAGES + 1, MMU::ReadWrite | MMU::NoExecute).value();
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// First page is a guard page, the rest is stack.
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MMU::unmap(address); // Unmap (without deallocating VM) one guard page so that attempts to access it fail with a
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// non-present page fault.
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kdbgln("stack guard page: %p", (void*)address);
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// The actual stack.
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Stack stack { address + ARCH_PAGE_SIZE, BOOTSTRAP_STACK_PAGES * ARCH_PAGE_SIZE };
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return stack.top();
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}
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extern "C" [[noreturn]] void _start()
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{
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Init::check_magic();
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Init::early_init();
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u64 bootstrap_stack_top = allocate_initial_kernel_stack();
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CPU::bootstrap_switch_stack(bootstrap_stack_top, (void*)init_wrapper);
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}
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