- Created two-level x86 paging (page directory + page tables) with 4 KiB pages.
- Identity maps all detected physical memory in two phases:
1) Static: first 16 MiB using 4 BSS-allocated page tables (avoids
chicken-and-egg with PMM bitmap in BSS).
2) Dynamic: memory above 16 MiB using PMM-allocated page tables,
created before paging is enabled so physical addresses still work.
- Provides kernel heap at 0xD0000000–0xF0000000 for virtual page allocation.
- API: paging_map_page, paging_unmap_page, paging_alloc_page, paging_free_page,
paging_get_physical.
- Added pmm_get_memory_size() to expose detected RAM for paging init.
- Kernel tests paging by allocating a virtual page, writing 0xDEADBEEF, and
reading it back, then freeing it.
- Added documentation in docs/paging.md.
Tested: boots and passes paging test with both 4 MiB and 128 MiB RAM in QEMU.
- Added bitmap-based physical memory manager (PMM) that parses the Multiboot2
memory map to discover available RAM regions.
- Supports two allocation zones: PMM_ZONE_DMA (below 16MB) and PMM_ZONE_NORMAL
(above 16MB), with automatic fallback from NORMAL to DMA when the preferred
zone is exhausted.
- Marks kernel memory region and multiboot info structure as reserved using
_kernel_start/_kernel_end linker symbols.
- Page 0 is always marked as used to prevent returning NULL as a valid address.
- Added linker script symbols (_kernel_start, _kernel_end) to track kernel
memory boundaries for the allocator.
- Kernel now initializes PMM after PIC and performs test allocations to verify
the subsystem works.
