continuing Feature/arm64 parity #129
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Bring ARM64 to parity with x86_64 for kernel heap allocation and fix the TTBR0 page table switch needed for userspace execution. Heap allocator changes: - Remove 256KB static bump allocator from main_aarch64.rs - Use unified heap allocator from kernel/src/memory/heap.rs - ARM64 heap placed in direct-mapped region (0xFFFF_0000_4800_0000) - Skip page mapping on ARM64 since boot.S provides direct map TTBR0/userspace fixes: - Switch TTBR0 to process page table before ERET to userspace - Add TTBR0 switching helpers in context_switch.rs - Fix ARM64 user stack mapping (map into TTBR0, not TTBR1) Supporting changes: - Fix Docker scripts to use correct kernel binary path - Update coreutils for ARM64 argv handling - Add ARM64 syscall stubs for better compatibility init_shell now boots successfully on ARM64 QEMU. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Save/restore x30 (link register) around setup_mmu helper calls - Change device memory shareability from inner to none for MMIO regions - Add clarifying comment about PL011 UART in device block mapping Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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