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Implementation
Why This Matters
The E820 memory map you're parsing here is exactly what GRUB passes to every multiboot-compliant kernel, and it's the only way an OS learns which physical addresses are real RAM versus reserved for the VGA buffer, ACPI tables, or memory-mapped PCI devices. Allocating a page from a region you mistakenly marked usable is how kernels corrupt firmware data structures or write straight into device registers.
Hints
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Validation Suite
main.c
Workspace 1.0
Simulate parsing a BIOS E820 memory map in C.
Requirements:
Define E820_ENTRY structure with base, length, and type
Create a sample memory map with mixed region types
Implement parse_e820_map() that iterates entries
Print each region with base, length, type name, and size in MB
Calculate total usable RAM (type 1)
Calculate total reserved memory (type 2)
Show which regions are safe for kernel allocation
Implement find_free_region() that returns largest usable block
Handle entries above 4GB (print as high addresses)