cf3059747a
- 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.
33 lines
307 B
Plaintext
33 lines
307 B
Plaintext
ENTRY(_start)
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SECTIONS
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{
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. = 1M;
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_kernel_start = .;
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.text BLOCK(4K) : ALIGN(4K)
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{
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KEEP(*(.multiboot))
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*(.text)
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}
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.rodata BLOCK(4K) : ALIGN(4K)
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{
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*(.rodata)
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}
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.data BLOCK(4K) : ALIGN(4K)
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{
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*(.data)
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}
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.bss BLOCK(4K) : ALIGN(4K)
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{
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*(COMMON)
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*(.bss)
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}
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_kernel_end = .;
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}
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