Improve processes kernel stack - #126
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This will allow us to modify TSS next, which is useful in managing user space kernel stacks Signed-off-by: Amjad Alsharafi <26300843+Amjad50@users.noreply.github.com>
Previously each process had its own isolated process-specific kernel stack space that was VM-switched on process context switches. This approach had limitations when processes needed to be switched from kernel mode. This commit changes the architecture to use shared kernel stacks that are mapped to all processes but allocated per-process from a pool. Key changes: - Replace per-process VM-specific kernel stacks with shared pool approach - Add `ProcessKernelStack` allocator with bitmap-based management - Move kernel stack allocation from VM switching to process creation - Update TSS to load process-specific kernel stack on context switch - This supports 32768 concurrent processes kernel stacks (number is too large, just used it to fit into 4096 u8 array XD) Benefits: - Allows safer process switching from kernel mode contexts - Reduces VM switching complexity for kernel stack management Signed-off-by: Amjad Alsharafi <26300843+Amjad50@users.noreply.github.com>
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