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#include "arch/kernel/main.hpp"
#include "arch/boot/pointers.hpp"
#include "arch/memory/multiboot.hpp"
#include "arch/video/vga/text.hpp"
namespace teachos::arch::kernel
{
auto print_mem_info(arch::memory::memory_info * mem_info) -> void
{
using namespace video::vga;
auto mem_lower = mem_info->mem_lower;
text::write("Lower memory (kB): ", text::common_attributes::green_on_black);
text::write_number(mem_lower, text::common_attributes::green_on_black);
auto mem_upper = mem_info->mem_upper;
text::write("Upper memory (kB): ", text::common_attributes::green_on_black);
text::write_number(mem_upper, text::common_attributes::green_on_black);
}
auto print_memory_map(arch::memory::memory_map * mminfo) -> void
{
using namespace video::vga;
uint32_t const entry_size = mminfo->entry_size;
text::write("Entry Size: ", text::common_attributes::green_on_black);
text::write_number(entry_size, text::common_attributes::green_on_black);
uint32_t const entry_version = mminfo->entry_version;
text::write("Version: ", text::common_attributes::green_on_black);
text::write_number(entry_version, text::common_attributes::green_on_black);
uint32_t const remaining_size = mminfo->tag.size - (4 * sizeof(uint32_t));
uint32_t const entry_amount = remaining_size / entry_size;
auto begin = &mminfo->entries;
auto end = begin + entry_amount;
for (auto entry = begin; entry != end; ++entry)
{
text::write("Base Address: ", text::common_attributes::green_on_black);
text::write_number(entry->base_addr, text::common_attributes::green_on_black);
text::write("Length: ", text::common_attributes::green_on_black);
text::write_number(entry->length, text::common_attributes::green_on_black);
text::write("Type: ", text::common_attributes::green_on_black);
text::write_number(static_cast<std::underlying_type<arch::memory::memory_area_type>::type>(entry->type),
text::common_attributes::green_on_black);
text::write("Reserved: ", text::common_attributes::green_on_black);
text::write_number(entry->reserved, text::common_attributes::green_on_black);
}
}
auto print_elf_sections(arch::memory::elf_symbols_section * symbol) -> void
{
using namespace video::vga;
uint16_t const num = symbol->num;
text::write("Number of entries: ", text::common_attributes::green_on_black);
text::write_number(num, text::common_attributes::green_on_black);
uint16_t const entsize = symbol->entsize;
text::write("Entry Size: ", text::common_attributes::green_on_black);
text::write_number(entsize, text::common_attributes::green_on_black);
uint16_t const shndx = symbol->shndx;
text::write("Section index: ", text::common_attributes::green_on_black);
text::write_number(shndx, text::common_attributes::green_on_black);
auto begin = &symbol->sections;
auto end = begin + num;
for (auto section = begin; section != end; ++section)
{
uint32_t const sh_name = section->sh_name;
text::write("Section name: ", text::common_attributes::green_on_black);
text::write_number(sh_name, text::common_attributes::green_on_black);
uint32_t const sh_type = section->sh_type;
text::write("Section type: ", text::common_attributes::green_on_black);
text::write_number(sh_type, text::common_attributes::green_on_black);
uint64_t const sh_flags = section->sh_flags;
text::write("Section flags: ", text::common_attributes::green_on_black);
text::write_number(sh_flags, text::common_attributes::green_on_black);
uint64_t const sh_addr = section->sh_addr;
text::write("Section address: ", text::common_attributes::green_on_black);
text::write_number(sh_addr, text::common_attributes::green_on_black);
uint64_t const sh_offset = section->sh_offset;
text::write("Section offset: ", text::common_attributes::green_on_black);
text::write_number(sh_offset, text::common_attributes::green_on_black);
uint64_t const sh_size = section->sh_size;
text::write("Section size: ", text::common_attributes::green_on_black);
text::write_number(sh_size, text::common_attributes::green_on_black);
uint32_t const sh_link = section->sh_link;
text::write("Section link: ", text::common_attributes::green_on_black);
text::write_number(sh_link, text::common_attributes::green_on_black);
uint32_t const sh_info = section->sh_info;
text::write("Section info: ", text::common_attributes::green_on_black);
text::write_number(sh_info, text::common_attributes::green_on_black);
uint64_t const sh_addralign = section->sh_addralign;
text::write("Section address align: ", text::common_attributes::green_on_black);
text::write_number(sh_addralign, text::common_attributes::green_on_black);
uint64_t const sh_entsize = section->sh_entsize;
text::write("Section entry size: ", text::common_attributes::green_on_black);
text::write_number(sh_entsize, text::common_attributes::green_on_black);
}
}
auto main() -> void
{
using namespace video::vga;
text::clear();
text::cursor(false);
text::write("TeachOS is starting up...", text::common_attributes::green_on_black);
arch::memory::multi_boot_info * multiboot_information_pointer =
(arch::memory::multi_boot_info *)arch::boot::multiboot_information_pointer;
auto multiboot_tag = &(multiboot_information_pointer->tags);
text::write("Multiboot Start: ", text::common_attributes::green_on_black);
text::write_number(arch::boot::multiboot_information_pointer, text::common_attributes::green_on_black);
text::write("Multiboot End: ", text::common_attributes::green_on_black);
text::write_number(arch::boot::multiboot_information_pointer + multiboot_information_pointer->total_size,
text::common_attributes::green_on_black);
/*
* Loop over the multiboot2 tags to access the information needed.
* Tags are defined in the header file and are padded so that each
* Tag starts at an 8-bytes aligned adress.
*
* The increment part aligns the size to an 8-byte address.
*/
for (auto tag = multiboot_tag; tag->type != arch::memory::multi_boot_tag_type::END;
tag = (arch::memory::multi_boot_tag *)(((uint8_t *)tag) + ((tag->size + 7) & ~7)))
{
switch (tag->type)
{
case arch::memory::multi_boot_tag_type::BASIC_MEMORY_INFO:
print_mem_info((arch::memory::memory_info *)tag);
break;
case arch::memory::multi_boot_tag_type::ELF_SECTIONS:
print_elf_sections((arch::memory::elf_symbols_section *)tag);
break;
case arch::memory::multi_boot_tag_type::MEMORY_MAP:
print_memory_map((arch::memory::memory_map *)tag);
break;
default:
// All other cases are not important and can be ignored
break;
}
}
}
} // namespace teachos::arch::kernel
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