private void SetPageEntry(uint *pageTablePtr, uint entry, uint addr, PTEFlags flags)
{
#if PAGING_TRACE
BasicConsole.WriteLine("Setting page entry...");
BasicConsole.WriteLine(((FOS_System.String) "pageTablePtr=") + (uint)pageTablePtr);
BasicConsole.WriteLine(((FOS_System.String) "entry=") + entry);
BasicConsole.WriteLine(((FOS_System.String) "addr=") + addr);
#endif
pageTablePtr[entry] = addr | (uint)flags;
#if PAGING_TRACE
if (pageTablePtr[entry] != (addr | 3))
{
BasicConsole.WriteLine("Set page entry verification failed.");
}
#endif
}
public override void Map(uint pAddr, uint vAddr, PageFlags flags, UpdateUsedPagesFlags UpdateUsedPages = UpdateUsedPagesFlags.Both)
{
PTEFlags pteFlags = PTEFlags.None;
if ((flags & PageFlags.Present) != 0)
{
pteFlags |= PTEFlags.Present;
}
if ((flags & PageFlags.KernelOnly) == 0)
{
pteFlags |= PTEFlags.UserAllowed;
}
if ((flags & PageFlags.Writeable) != 0)
{
pteFlags |= PTEFlags.Writeable;
}
Map(pAddr, vAddr, pteFlags, UpdateUsedPages);
}
private void Map(uint pAddr, uint vAddr, PTEFlags flags, UpdateUsedPagesFlags UpdateUsedPages = UpdateUsedPagesFlags.Both)
{
#if PAGING_TRACE
BasicConsole.WriteLine("Mapping addresses...");
#endif
//Calculate page directory and page table indices
uint virtPDIdx = vAddr >> 22;
uint virtPTIdx = (vAddr >> 12) & 0x03FF;
uint physPDIdx = pAddr >> 22;
uint physPTIdx = (pAddr >> 12) & 0x03FF;
#if PAGING_TRACE
BasicConsole.WriteLine(((FOS_System.String) "pAddr=") + pAddr);
BasicConsole.WriteLine(((FOS_System.String) "vAddr=") + vAddr);
BasicConsole.WriteLine(((FOS_System.String) "physPDIdx=") + physPDIdx);
BasicConsole.WriteLine(((FOS_System.String) "physPTIdx=") + physPTIdx);
BasicConsole.WriteLine(((FOS_System.String) "virtPDIdx=") + virtPDIdx);
BasicConsole.WriteLine(((FOS_System.String) "virtPTIdx=") + virtPTIdx);
#endif
if ((UpdateUsedPages & UpdateUsedPagesFlags.Physical) != 0)
{
UsedPhysPages.Set((int)((physPDIdx * 1024) + physPTIdx));
}
if ((UpdateUsedPages & UpdateUsedPagesFlags.Virtual) != 0)
{
UsedVirtPages.Set((int)((virtPDIdx * 1024) + virtPTIdx));
}
//Get a pointer to the pre-allocated page table
uint *virtPTPtr = GetFixedPage(virtPDIdx);
#if PAGING_TRACE
BasicConsole.WriteLine(((FOS_System.String) "ptPtr=") + (uint)virtPTPtr);
#endif
//Set the page table entry
SetPageEntry(virtPTPtr, virtPTIdx, pAddr, flags);
//Set directory table entry
SetDirectoryEntry(virtPDIdx, (uint *)GetPhysicalAddress((uint)virtPTPtr));
//Invalidate the page table entry so that mapping isn't CPU cached.
InvalidatePTE(vAddr);
}
private void SetPageEntry(uint* pageTablePtr, uint entry, uint addr, PTEFlags flags)
{
#if PAGING_TRACE
BasicConsole.WriteLine("Setting page entry...");
BasicConsole.WriteLine(((FOS_System.String)"pageTablePtr=") + (uint)pageTablePtr);
BasicConsole.WriteLine(((FOS_System.String)"entry=") + entry);
BasicConsole.WriteLine(((FOS_System.String)"addr=") + addr);
#endif
pageTablePtr[entry] = addr | (uint)flags;
#if PAGING_TRACE
if(pageTablePtr[entry] != (addr | 3))
{
BasicConsole.WriteLine("Set page entry verification failed.");
}
#endif
}
private void Map(uint pAddr, uint vAddr, PTEFlags flags, UpdateUsedPagesFlags UpdateUsedPages = UpdateUsedPagesFlags.Both)
{
#if PAGING_TRACE
BasicConsole.WriteLine("Mapping addresses...");
#endif
//Calculate page directory and page table indices
uint virtPDIdx = vAddr >> 22;
uint virtPTIdx = (vAddr >> 12) & 0x03FF;
uint physPDIdx = pAddr >> 22;
uint physPTIdx = (pAddr >> 12) & 0x03FF;
#if PAGING_TRACE
BasicConsole.WriteLine(((FOS_System.String)"pAddr=") + pAddr);
BasicConsole.WriteLine(((FOS_System.String)"vAddr=") + vAddr);
BasicConsole.WriteLine(((FOS_System.String)"physPDIdx=") + physPDIdx);
BasicConsole.WriteLine(((FOS_System.String)"physPTIdx=") + physPTIdx);
BasicConsole.WriteLine(((FOS_System.String)"virtPDIdx=") + virtPDIdx);
BasicConsole.WriteLine(((FOS_System.String)"virtPTIdx=") + virtPTIdx);
#endif
if ((UpdateUsedPages & UpdateUsedPagesFlags.Physical) != 0)
{
UsedPhysPages.Set((int)((physPDIdx * 1024) + physPTIdx));
}
if((UpdateUsedPages & UpdateUsedPagesFlags.Virtual) != 0)
{
UsedVirtPages.Set((int)((virtPDIdx * 1024) + virtPTIdx));
}
//Get a pointer to the pre-allocated page table
uint* virtPTPtr = GetFixedPage(virtPDIdx);
#if PAGING_TRACE
BasicConsole.WriteLine(((FOS_System.String)"ptPtr=") + (uint)virtPTPtr);
#endif
//Set the page table entry
SetPageEntry(virtPTPtr, virtPTIdx, pAddr, flags);
//Set directory table entry
SetDirectoryEntry(virtPDIdx, (uint*)GetPhysicalAddress((uint)virtPTPtr));
//Invalidate the page table entry so that mapping isn't CPU cached.
InvalidatePTE(vAddr);
}
