Wiki: Create Spoke Page for Core - Paging-Implementation

[LSantha]

Goal

Document JNode's x86 paging and address space mapping.

Instructions

1. Use the Skill: Apply the update-wiki skill.
2. Research: Analyze core/src/core/org/jnode/vm/memmgr/ and the assembly page table setup.
3. Content: Explain the mapping of the 4GB address space and how JNode handles page faults.

[LSantha]

/oc Please proceed with this task.

[opencode-agent]

Wiki page created and pushed: https://github.com/LSantha/jnode_ai/wiki/Paging-Implementation

The page covers:

• 32-bit paging: Flat 4GB identity-mapped address space with 4MB pages, null guard at 0x0, high guard at 0xFFC00000, kernel RO protection
• 64-bit paging: 4-level table hierarchy (PML4→PDP→PD→PT), first 2MB via 4KB PT0, remainder via 2MB PD pages
• Page fault handling: Guard pages convert to Java exceptions, heap growth, null-pointer detection
• Key files: mm32.asm, mm64.asm, kernel.asm, VmHeapManager, MemoryBlockManager

Index and Glossary updated. Issue #29 closed.

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