Development #20
Development #20
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WalkthroughThis update introduces screen scrolling to the Changes
Sequence Diagram(s)sequenceDiagram
participant UserApp
participant Kernel
participant Screen
UserApp->>Kernel: SYS_WRITE(buffer, size)
Kernel->>Kernel: Copy buffer to kernel-local buffer (FastMemcpy)
Kernel->>Kernel: Null-terminate kernel buffer
Kernel->>Screen: PrintKernel(kernel buffer)
Note right of Screen: If screen full, scroll up
Possibly related PRs
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Actionable comments posted: 0
🧹 Nitpick comments (1)
Kernel/Drivers/Interrupts.c (1)
73-73: Fix misleading comment that contradicts the code state.The comment says "Re-enabled" but the
FastDisplayTicks(tick_count)call is actually commented out (disabled). This inconsistency could confuse future developers about the intended state.- // FastDisplayTicks(tick_count); // Re-enabled + // FastDisplayTicks(tick_count); // Disabled to reduce interrupt overhead
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📒 Files selected for processing (6)
Kernel/Core/Kernel.c(1 hunks)Kernel/Core/Kernel.h(0 hunks)Kernel/Core/Panic.c(3 hunks)Kernel/Drivers/Interrupts.c(1 hunks)Kernel/Memory/Memory.c(1 hunks)Kernel/System/Syscall.c(2 hunks)
💤 Files with no reviewable changes (1)
- Kernel/Core/Kernel.h
🧰 Additional context used
🧠 Learnings (1)
Kernel/Drivers/Interrupts.c (1)
Learnt from: assembler-0
PR: assembler-0/VoidFrame#2
File: Kernel/Syscall.c:44-44
Timestamp: 2025-07-08T00:36:50.290Z
Learning: In IdtSetGate function calls, the parameters are: (interrupt_vector, handler_address, selector, flags). The interrupt vector (like 0x80) is the first argument, and the selector (like 0x08 for kernel code segment) is the third argument.
🧬 Code Graph Analysis (2)
Kernel/Memory/Memory.c (2)
Kernel/Memory/MemOps.c (1)
FastMemset(4-34)Kernel/Memory/MemOps.h (1)
FastMemset(6-6)
Kernel/System/Syscall.c (4)
Kernel/Memory/MemOps.c (1)
FastMemcpy(36-58)Kernel/Memory/MemOps.h (1)
FastMemcpy(7-7)Kernel/Core/Kernel.c (1)
PrintKernel(25-56)Kernel/Core/Kernel.h (1)
PrintKernel(6-6)
🔇 Additional comments (6)
Kernel/Core/Kernel.c (1)
41-54: Excellent implementation of screen scrolling functionality.The scrolling logic correctly handles the transition when the cursor reaches the bottom of the screen. The implementation moves all lines up by one position, clears the last line, and repositions the cursor appropriately. This ensures continuous output without truncation.
Kernel/Core/Panic.c (1)
10-10: Good optimization: removing unnecessary busy-wait loops.Eliminating busy-wait loops in panic handlers improves efficiency and reduces unnecessary CPU consumption during critical error conditions. The panic handlers still function correctly by printing error messages and halting the system.
Also applies to: 22-22, 34-34
Kernel/Memory/Memory.c (1)
15-16: Excellent optimization using FastMemset for bitmap initialization.Replacing the manual loop with
FastMemsetsignificantly improves performance by leveraging optimized CPU instructions (SSE2) for bulk memory operations when available. The functionality remains identical while gaining substantial performance benefits.Kernel/System/Syscall.c (3)
6-6: Good addition of MemOps.h for FastMemcpy functionality.Including the MemOps header enables the use of optimized memory operations for safer and more efficient syscall buffer handling.
31-42: Excellent security and performance improvements to SYS_WRITE handling.The refactored approach provides significant benefits:
- Security: Limits buffer size and copies to kernel-controlled buffer
- Safety: Ensures null termination to prevent buffer overruns
- Performance: Uses optimized FastMemcpy and bulk printing via PrintKernel
- Efficiency: Eliminates character-by-character processing
32-32: No changes needed:MAX_SYSCALL_BUFFER_SIZEis defined
The constant is defined inKernel/System/Syscall.h:14, so the usage inSyscall.cis valid.
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Summary by CodeRabbit
New Features
Performance Improvements
Bug Fixes
Other Changes