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#pragma once
// ============================================================================
// boot_info.h - Boot handoff struct
// Shared between the UEFI loader and the kernel.
// The loader fills it, the kernel consumes it. Simple.
// In future i will expand this struct
// ============================================================================
#include <stdint.h>
// ── Boot Magic Number───────────────────────────────────────────────────────
inline constexpr uint64_t BOOT_INFO_MAGIC = 0xDEADDEADDEADDEADULL;
// ── Framebuffer (GOP) ───────────────────────────────────────────────────────
// TODO: remove Framebuffer to driver
enum class PixelFormat : uint32_t {
RGB = 0, // PixelRedGreenBlueReserved8BitPerColor
BGR = 1, // PixelBlueGreenRedReserved8BitPerColor
Mask = 2, // PixelBitMask — need to check masks
};
struct FramebufferInfo {
uint64_t base; // Physical address of framebuffer
uint32_t width; // Horizontal resolution in pixels
uint32_t height; // Vertical resolution in pixels
uint32_t pitch; // Bytes per scanline (>= width * 4)
PixelFormat format;
};
// ── Memory map ─────────────────────────────────────────────────────────────
//TODO: remove FrameBuffer
enum class MemoryRegionType : uint32_t {
Usable = 0, // Free RAM - kernel can use
Reserved = 1, // Firmware/hardware reserved
AcpiReclaimable = 2, // ACPI tables - free after parsing
AcpiNvs = 3, // ACPI non-volatile storage
BootloaderReclaimable = 4, // Loader code/data - free after kernel init
KernelAndModules = 5, // Kernel image + any loaded modules
Framebuffer = 6, // Framebuffer memory - do not use as RAM
};
struct MemoryRegion {
uint64_t base;
uint64_t length;
MemoryRegionType type;
uint32_t _reserved; // Padding to 24 bytes
};
// ── Boot info structure ────────────────────────────────────────────────────
struct BootInfo {
uint64_t magic; // Must be BOOT_INFO_MAGIC
// Framebuffer
// Todo: remove
FramebufferInfo framebuffer;
// Memory map (array of MemoryRegion)
MemoryRegion* memory_map;
uint64_t memory_map_count;
// Platform-specific firmware tables (both always present to keep layout uniform)
uint64_t rsdp_address; // ACPI RSDP (x86_64), 0 if absent
uint64_t fdt_address; // Flattened Device Tree (aarch64), 0 if absent
// Kernel load info
uint64_t kernel_phys_base; // Where the kernel was loaded physically
uint64_t kernel_virt_base; // Kernel's virtual base (from ELF)
uint64_t kernel_size; // Total size of kernel in memory
// Kernel entry point (virtual address from ELF e_entry)
uint64_t kernel_entry_point;
// Higher-half direct map base (if set up by loader)
uint64_t hhdm_base; // e.g., 0xFFFF800000000000
// Kernel command line (null-terminated string, or nullptr if none)
// The loader can read this from a config file on the ESP.
const char* cmdline; // e.g., "verbose nosmp mem=256M"
};
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