Merge branch 'feature/memory-allocation-optimization' into feature/process-management

# Conflicts:
#	src/kernel.pas
#	src/lmemorymanager.pas
#	src/progmanager.pas

src/prog/meminfo.pas

@@ -0,0 +1,83 @@
+//  Copyright 2021 Kieron Morris
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+{ 
+	Prog->meminfo - Print memory statistics (PMM / LMM).
+	
+	@author(Kieron Morris <[email protected]>)
+}
+unit meminfo;
+
+interface
+
+uses
+    stdio, multiboot, pmemorymanager, lmemorymanager, tracer;
+
+procedure init();
+
+implementation
+
+procedure run(Params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
+var
+    pmm_total, pmm_free, pmm_used : uint32;
+    lmm_pages, lmm_free           : uint32;
+begin
+    { Multiboot memory info }
+    stdio.bufWriteStrLn(stdout_buf, '--- Multiboot ---');
+    stdio.bufWriteStr(stdout_buf, 'Lower Memory  : ');
+    stdio.bufWriteInt(stdout_buf, multibootinfo^.mem_lower);
+    stdio.bufWriteStrLn(stdout_buf, ' KB');
+    stdio.bufWriteStr(stdout_buf, 'Upper Memory  : ');
+    stdio.bufWriteInt(stdout_buf, multibootinfo^.mem_upper);
+    stdio.bufWriteStrLn(stdout_buf, ' KB');
+    stdio.bufWriteStr(stdout_buf, 'Total Memory  : ');
+    stdio.bufWriteInt(stdout_buf, ((multibootinfo^.mem_upper + 1000) div 1024) + 1);
+    stdio.bufWriteStrLn(stdout_buf, ' MB');
+
+    { PMM stats }
+    stdio.bufWriteStrLn(stdout_buf, '--- PMM (4 MB blocks) ---');
+    pmm_total := pmemorymanager.pmm_total_blocks;
+    pmm_free  := pmemorymanager.pmm_free_blocks;
+    pmm_used  := pmm_total - pmm_free;
+    stdio.bufWriteStr(stdout_buf, 'Total Blocks  : ');
+    stdio.bufWriteIntLn(stdout_buf, pmm_total);
+    stdio.bufWriteStr(stdout_buf, 'Free Blocks   : ');
+    stdio.bufWriteIntLn(stdout_buf, pmm_free);
+    stdio.bufWriteStr(stdout_buf, 'Used Blocks   : ');
+    stdio.bufWriteIntLn(stdout_buf, pmm_used);
+    stdio.bufWriteStr(stdout_buf, 'Free Physical : ');
+    stdio.bufWriteInt(stdout_buf, pmm_free * 4);
+    stdio.bufWriteStrLn(stdout_buf, ' MB');
+
+    { LMM heap stats }
+    stdio.bufWriteStrLn(stdout_buf, '--- LMM (Heap) ---');
+    lmm_pages := lmemorymanager.lmm_page_count;
+    lmm_free  := lmemorymanager.lmm_total_free;
+    stdio.bufWriteStr(stdout_buf, 'Heap Pages    : ');
+    stdio.bufWriteIntLn(stdout_buf, lmm_pages);
+    stdio.bufWriteStr(stdout_buf, 'Heap Size     : ');
+    stdio.bufWriteInt(stdout_buf, lmm_pages * 4);
+    stdio.bufWriteStrLn(stdout_buf, ' MB');
+    stdio.bufWriteStr(stdout_buf, 'Heap Free     : ');
+    stdio.bufWriteInt(stdout_buf, lmm_free div 1024);
+    stdio.bufWriteStrLn(stdout_buf, ' KB');
+end;
+
+procedure init();
+begin
+    tracer.push_trace('meminfo.init');
+    stdio.registerCommand('MEMINFO', @Run, 'Print memory statistics (PMM/LMM).');
+end;
+
+end.