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91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
#include "textoutput.hpp"
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#include <cstdint>
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extern TextOutput& term;
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struct multiboot2
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{
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static constexpr std::uint32_t MAGIC = 0xE85250D6;
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static constexpr std::uint32_t FLAGS = 0;
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static constexpr std::uint32_t LENGTH = 16;
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static constexpr std::uint32_t CHECKSUM = -(MAGIC + FLAGS + LENGTH);
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alignas(8)
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std::uint32_t magic = MAGIC;
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std::uint32_t flags = FLAGS;
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std::uint32_t length = LENGTH;
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std::uint32_t checksum = CHECKSUM;
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} __attribute__((packed));
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struct multiboot2_tag
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{
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alignas(8)
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std::uint16_t id;
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std::uint16_t flags;
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std::uint32_t length;
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std::uint32_t data[];
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} __attribute__((packed));
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__attribute__((section(".multiboot2")))
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multiboot2 multibootHeader;
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__attribute__((section(".multiboot2")))
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multiboot2_tag multibootTagInfoRequest = {
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1, 0, sizeof(multiboot2_tag) + sizeof(std::uint32_t),
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{4}
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};
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__attribute__((section(".multiboot2")))
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multiboot2_tag multibootTagEnd = {
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0, 0, sizeof(multiboot2_tag), {}
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};
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std::uint32_t multiboot_magic;
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std::uint32_t *multiboot_ptr;
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std::uint32_t lowerMem = 0;
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std::uint32_t upperMem = 0;
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std::uint32_t *acpiRsdp = nullptr;
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std::uint32_t *acpiRsdpV2 = nullptr;
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bool multiboot_initialize()
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{
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if (multiboot_magic != 0x36d76289) {
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term.write("Not multiboot!");
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return false;
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}
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term.write("Found multiboot headers: ");
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auto ptr = multiboot_ptr + 2;
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while (ptr[0] != 0 && ptr[1] != 8) {
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term.write(ptr[0]);
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term.write(", ");
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switch (ptr[0]) {
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case 4:
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lowerMem = ptr[2] * 1024;
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upperMem = ptr[3] * 1024;
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break;
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case 14:
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acpiRsdp = ptr + 2;
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break;
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case 15:
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acpiRsdpV2 = ptr + 2;
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break;
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default:
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break;
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}
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auto next = reinterpret_cast<std::uintptr_t>(ptr);
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next += ptr[1];
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next = (next + 7) & ~7;
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ptr = reinterpret_cast<std::uint32_t *>(next);
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}
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term.write('\n');
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return true;
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}
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