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Use UEFI Boot Services and Memory Map

hard6/8

Use PCI BIOS Functions for Device Enumeration Use UEFI Graphics Output Protocol (GOP)

Language

Compiler

2.0s Limit 256MB

Submit and pass all tests to enable saving to GitHub.

Implementation

Simulate UEFI memory map handling in C.

Requirements:

Define EFI_MEMORY_DESCRIPTOR structure
Implement get_memory_map() that returns simulated map entries
Print each entry with type, physical address, size, and pages
Calculate total conventional memory available
Calculate total boot services memory (reclaimable)
Show ACPI reclaimable and NVS regions
Show memory-mapped I/O regions
Implement print_memory_type() that converts type to string
Show that boot services code/data can be reclaimed

Test:

Show memory map retrieved
Show types printed
Show total conventional memory
Show reclaimable memory
Show ACPI regions

Why This Matters

The two-call GetMemoryMap() pattern you implement here (query size, allocate, query again) is exactly what the Linux kernel's EFI stub and every GRUB2/systemd-boot loader must do before calling ExitBootServices, and getting the MapKey stale is a real bug class that causes ExitBootServices to fail on real hardware. This memory map is also the direct successor to the old BIOS INT 0x15 E820 map that Linux's `e820` code parsed for decades.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0

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