Implement physical memory allocator with zone support (AI)

- 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.

This commit is contained in:

2026-02-23 10:52:06 +00:00

parent f1923fdbcf

commit cf3059747a

5 changed files with 199 additions and 0 deletions

									
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src/CMakeLists.txt
									
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				@@ -7,6 +7,7 @@ add_executable(kernel

				    idt.c

				    isr.c

				    pic.c

				    pmm.c

				    interrupts.S

				    kernel.c

				)

Implement physical memory allocator with zone support (AI)

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src/CMakeLists.txt

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