Implement kernel memory allocator (kmalloc/kfree) and freestanding string library (AI)

- Added first-fit free-list allocator with block splitting and coalescing.
  Provides kmalloc(), kfree(), and kcalloc() for kernel-space dynamic memory.
- Each block carries an inline header with a magic value (0xCAFEBABE) for
  heap corruption detection, plus double-free checking.
- Memory is obtained from the paging subsystem in 4 KiB page increments.
  All allocations are 8-byte aligned with a 16-byte minimum block size.
- Created freestanding string.c with memset, memcpy, memmove, memcmp,
  strlen, strcmp, strncmp, strcpy, strncpy — replacing the unavailable
  libc implementations.
- Added documentation in docs/kmalloc.md.

Tested: kmalloc(64) returns 0xD0001010 (in kernel heap) and kfree succeeds.
Works with both 4 MiB and 128 MiB RAM.

This commit is contained in:

2026-02-23 11:06:52 +00:00

parent fb61ab7c15

commit f63cd9eb3f

7 changed files with 551 additions and 1 deletions

									
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src/CMakeLists.txt
									
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				@@ -9,6 +9,8 @@ add_executable(kernel

				    pic.c

				    pmm.c

				    paging.c

				    kmalloc.c

				    string.c

				    interrupts.S

				    kernel.c

				)

Implement kernel memory allocator (kmalloc/kfree) and freestanding string library (AI)

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src/CMakeLists.txt

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