Lots of stuff added : heap, timer, device managment, ...

1 files changed, 79 insertions, 0 deletions

diff --git a/Source/Kernel/MemoryManager/PhysMem.ns.cpp b/Source/Kernel/MemoryManager/PhysMem.ns.cpp
new file mode 100644
index 0000000..a9bfd35
--- /dev/null
+++ b/Source/Kernel/MemoryManager/PhysMem.ns.cpp
@@ -0,0 +1,79 @@
+#include "PhysMem.ns.h"
+#include <Library/Bitset.class.h>
+#include <VTManager/VirtualTerminal.class.h>
+
+PageDirectory* kernelPageDirectory;
+
+namespace PhysMem {
+
+u32int nframes;
+Bitset *frames;
+
+void initPaging(u32int mem_size) {
+	nframes = mem_size / 0x1000;
+	
+	frames = new Bitset(nframes);
+
+	kernelPageDirectory = new (Mem::kalloc(sizeof(PageDirectory), true)) PageDirectory();
+
+	u32int i = 0xC0000000;
+	while (i < Mem::placementAddress) {
+		page_t *p2 = kernelPageDirectory->getPage(i, true);
+		allocFrame(p2, true, false);
+		/* /DEBUG_HEX(i); DEBUG(" =>");
+		DEBUG_HEX(p2->frame); DEBUG("."); */
+		i += 0x1000;
+	}
+	//Also map thoses pages at begning of virtual memory
+	for (u32int i = 0; i < (Mem::placementAddress - 0xC0000000) / 0x100000; i++) {
+		kernelPageDirectory->tablesPhysical[i] = kernelPageDirectory->tablesPhysical[768 + i];
+		kernelPageDirectory->tables[i] = kernelPageDirectory->tables[768 + i];
+	}
+	DEBUG_HEX((u32int)kernelPageDirectory->physicalAddr); DEBUG(" is page dir phys addr.");
+	//asm volatile("hlt");
+
+	kernelPageDirectory->switchTo();
+	DEBUG("Paging enabled !");
+
+	Mem::pagingEnabled = true;
+}
+
+void removeTemporaryPages() {
+	for (u32int i = 0; i < (Mem::placementAddress - 0xC0000000) / 0x100000; i++) {
+		kernelPageDirectory->tablesPhysical[i] = 0;
+		kernelPageDirectory->tables[i] = 0;
+	}
+}
+
+void allocFrame(page_t *page, bool is_user, bool is_writable) {
+	if (page->frame != 0) {
+		return;
+	} else {
+		u32int idx = frames->firstFreeBit();
+		if (idx == (u32int) - 1) PANIC("No more free frames !");
+		frames->setBit(idx);
+		page->present = 1;
+		page->user = (is_user ? 1 : 0);
+		page->rw = (is_writable ? 1 : 0);
+		page->frame = idx;
+	}
+}
+
+void freeFrame(page_t *page) {
+	if (page->frame == 0) {
+		return;
+	} else {
+		frames->clearBit(page->frame / 0x1000);
+		page->frame = 0;
+	}
+}
+
+u32int free() {
+	return nframes - frames->usedBits();
+}
+
+u32int total() {
+	return nframes;
+}
+
+}