94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
#include "Framebuffer.h"
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#include "Init.h"
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#include "MemoryManager.h"
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#include "arch/CPU.h"
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#include "arch/MMU.h"
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#include "arch/Serial.h"
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extern u8 fb[1];
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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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Serial::println("Hello, world!");
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Serial::printf("Current platform: %s\n", CPU::platform_string());
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Framebuffer::rect(0, 0, 200, 200, 0xFF00FF00);
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auto cpu_name_or_error = CPU::identify();
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Serial::println(cpu_name_or_error.has_error() ? "Unable to determine CPU name" : cpu_name_or_error.release_value());
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Serial::println(MMU::get_physical((u64)fb).has_error() ? "fb is not mapped" : "fb is mapped!!");
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const u64 address = 0xfffffffff8000000;
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u64 physical = MemoryManager::alloc_physical_page().release_value();
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auto rc = MMU::map(address, physical, MMU::ReadWrite);
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bool success = !rc.has_error();
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int flags;
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volatile u8* ptr;
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if (success) Serial::println("Mapped page :)");
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else
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{
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Serial::println("Failed to map page");
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CPU::efficient_halt();
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}
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if (MMU::get_physical(address).release_value() == physical) Serial::println("Mapping is active ;)");
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else
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{
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Serial::println("Mapping is not active");
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CPU::efficient_halt();
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}
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flags = MMU::get_flags(address).release_value();
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if (flags & MMU::ReadWrite) Serial::println("Mapping is writable");
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if (flags & MMU::User) Serial::println("Mapping is user accessible");
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auto rrc = MMU::remap(address, MMU::ReadWrite | MMU::User);
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if (rrc.has_error())
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{
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Serial::println("Failed to change flags of mapping");
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CPU::efficient_halt();
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}
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flags = MMU::get_flags(address).release_value();
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if (flags & MMU::ReadWrite) Serial::println("Mapping is now writable");
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if (flags & MMU::User) Serial::println("Mapping is now user accessible");
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ptr = (volatile u8*)address;
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*ptr = 8;
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Serial::println("Can write to pointer");
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auto urc = MMU::unmap(address);
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if (urc.has_error())
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{
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Serial::println("Failed to unmap page");
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CPU::efficient_halt();
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}
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if (urc.release_value() != physical)
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{
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Serial::println("unmap returned a different address than the one we mapped");
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CPU::efficient_halt();
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}
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Serial::println("Successfully unmapped address");
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*ptr = 16;
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Serial::println("ERROR: Still here after page fault");
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CPU::efficient_halt();
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} |