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Replace the compressed boot path with a relocatable higher-half RISC-V entry, expand memory and SMP support, and add the driver, TTY, VFS, exec, signal, syscall, initramfs, and self-test infrastructure needed for a bootable kernel checkpoint.
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- Implemented a self-test runner in `selftest.cc` to invoke all test suites.
- Added tests for atomic operations in `test_atomic.cc`, covering construction, store/load, exchange, arithmetic, and compare-and-swap.
- Created tests for the Flattened Device Tree (FDT) in `test_fdt.cc`, verifying node access and compatibility queries.
- Developed a comprehensive Physical Memory Manager (PMM) test suite in `test_pmm.cc`, including allocation, deallocation, reference counting, and boundary conditions.
- Implemented Red-Black Tree tests in `test_rbtree.cc`, validating insertion, deletion, and iteration.
- Added Slab Allocator tests in `test_slab.cc`, covering various allocation sizes, edge cases, and operator overloads.
- Created Spinlock tests in `test_spinlock.cc`, ensuring proper locking behavior and interrupt state preservation.
- Developed Virtual Memory Area (VMA) tests in `test_vma.cc`, validating region mapping, unmapping, and fault handling.
- Added tests for Virtual Memory Management (VMM) in `test_vmm.cc`, verifying address translation and page alignment.
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