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Bug resolved : alignment issue
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@ -11,8 +11,8 @@
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//-----------
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static pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE)));
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static ulong *MmPhysicalPageTable;
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pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE)));
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ulong *MmPhysicalPageTable;
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extern ulong _text;
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extern ulong _text_end;
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@ -48,8 +48,7 @@ void MmInitPaging(void)
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pdpe_t *MmPDP = NULL;
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pde_t *MmPD = NULL;
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pte_t *MmPT = NULL;
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ulong index;
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ulong lastKernelAddr = (ulong)(_heap_start + _heap_max);
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ulong index, xedni;
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ulong firstDirectoryAddr = 0;
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ulong lastDirectoryAddr = 0;
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ulong phDirSize = 0;
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@ -58,6 +57,7 @@ void MmInitPaging(void)
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ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
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// Difference between the end of kernel and the begin of userspace
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ulong lastKernelAddr = (ulong)(_heap_start + _heap_max);
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ulong diffKernUsr = (ulong)USERSPACE - lastKernelAddr - KPAGESIZE;
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// Maximum VIRTUAL address in memory
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@ -66,10 +66,10 @@ void MmInitPaging(void)
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//DebugLog("\tPaging gap : %u MB (%p)\n\tLast virtual address %p\n", diffKernUsr / MB, diffKernUsr, MmVirtLastAddress);
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memzero((void *)&MmPageMapLevel4[0], sizeof(MmPageMapLevel4));
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phDirSize = (phRamSize / KPAGESIZE)*sizeof(ulong);
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phDirSize = ((phRamSize / KPAGESIZE)*sizeof(ulong) + KPAGESIZE) & ( ~(KPAGESIZE - 1));
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//MmPhysicalPageTable = (ulong*)malloc((phRamSize / KPAGESIZE)*sizeof(ulong));
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DebugLog("\t\tRam %u MB, pagesize %u KB, size %u MB\n", phRamSize / MB, KPAGESIZE / KB, phDirSize / MB);
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MmPhysicalPageTable = (ulong*)malloc(phDirSize);
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//DebugLog("\t\tRam %u MB, pagesize %u KB, size %u MB\n", phRamSize / MB, KPAGESIZE / KB, phDirSize / MB);
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for (ulong curAddrPML4 = 0;
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curAddrPML4 < MmVirtLastAddress;
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@ -123,38 +123,45 @@ void MmInitPaging(void)
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// Create an entry in PT each page of 4KB
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index = (curAddrPT / ((ulong)KPAGESIZE)) % 512;
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xedni = (curAddrPT / ((ulong)KPAGESIZE));
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//DebugLog("\t\t\t\tPage %d : %p\n", index, curAddrPT);
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// STACK GUARD PAGE */
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if ((ulong)curAddrPT == (ulong)BtLoaderInfo.stackEndAddr) {
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MmPT[index] = (ulong)curAddrPT | PRESENT;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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MmStackGuards[0] = (ulong)curAddrPT;
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//DebugLog("\tStack Guard at %p\n", curAddrPT);
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}
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else if ((ulong)curAddrPT == (ulong)BtLoaderInfo.kernelEndAddr) {
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MmPT[index] = (ulong)curAddrPT | PRESENT;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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MmStackGuards[1] = (ulong)curAddrPT;
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//DebugLog("\tStack Guard at %p\n", curAddrPT);
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}
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// SECTION .TEXT PROTECTION
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else if ((ulong)curAddrPT >= (ulong)&_text && (ulong)curAddrPT <= (ulong)&_text_end) {
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MmPT[index] = (ulong)curAddrPT | PRESENT;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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//DebugLog("\tSection .text at %p\n", curAddrPT);
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}
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// SECTION .DATA PROTECTION
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else if ((ulong)curAddrPT >= (ulong)&_data && (ulong)curAddrPT <= (ulong)&_data_end) {
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MmPT[index] = (ulong)curAddrPT | PRESENT | WRITETHR | READWRITE | NX;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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//DebugLog("\tSection .data at %p\n", curAddrPT);
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}
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// SECTION .RODATA PROTECTION
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else if ((ulong)curAddrPT >= (ulong)&_rodata && (ulong)curAddrPT <= (ulong)&_rodata_end) {
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MmPT[index] = (ulong)curAddrPT | PRESENT | WRITETHR | NX;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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//DebugLog("\tSection .rodata at %p\n", curAddrPT);
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}
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// While we're inside the kernel pages
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else if ((ulong)curAddrPT <= lastKernelAddr) {
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MmPT[index] = (ulong)curAddrPT | PRESENT | READWRITE;
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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if ((ulong)curAddrPT == lastKernelAddr) {
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//DebugLog("\tLast page of kernel at %p\n", curAddrPT);
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@ -163,7 +170,8 @@ void MmInitPaging(void)
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// While we're inside the userspace pages
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else if ((ulong)curAddrPT >= USERSPACE) {
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MmPT[index] = ((ulong)curAddrPT - diffKernUsr) | PRESENT; // Not present for instance
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//MmPhysicalPageTable[(ulong)curAddrPT - diffKernUsr] = curAddrPT;
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xedni = (((ulong)curAddrPT - diffKernUsr) / ((ulong)KPAGESIZE));
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MmPhysicalPageTable[xedni] = (ulong)curAddrPT;
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if ((ulong)curAddrPT == USERSPACE) {
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DebugLog("\tUserspace at %p:%p\n", curAddrPT, curAddrPT - diffKernUsr);
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@ -173,7 +181,7 @@ void MmInitPaging(void)
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MmPT[index] = 0;
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}
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//KeFlushTlbSingle(curAddrPT);
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KeFlushTlbSingle(curAddrPT);
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}
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}
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}
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@ -181,7 +189,7 @@ void MmInitPaging(void)
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lastDirectoryAddr = (ulong)MmPT;
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MmLoadPML4((void *)MmPageMapLevel4);
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MmEnableWriteProtect();
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//MmEnableWriteProtect();
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DebugLog("\tPage table size : %u MB\n", (lastDirectoryAddr - firstDirectoryAddr + phDirSize)/MB);
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}
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@ -228,7 +236,10 @@ void *MmTransVirtToPhyAddr(void* virtualAddr)
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void *MmTransPhyToVirtAddr(void* physicalAddr)
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{
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return (void*)MmPhysicalPageTable[(ulong)physicalAddr];
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ulong phyAddrPage = (ulong)physicalAddr & ( ~(KPAGESIZE - 1));
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return (void*)( MmPhysicalPageTable[(ulong)physicalAddr
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/ ((ulong)KPAGESIZE)
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+ ((ulong)physicalAddr - phyAddrPage) ] );
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}
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//
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@ -312,6 +312,8 @@ static Command_t testcmdtable[] =
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{ "div", CmdFloatDiv, "Float div. Usage : div a b. Returns a/b"},
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{ "transvtp", CmdPageTranslateVirtToPhy, "Translate a virtual to"
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" physical address (paging)"},
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{ "transptv", CmdPageTranslatePhyToVirt, "Translate a physical to"
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" virtual address (paging)"},
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{ "pmap", CmdPageMap, "Map a page to given physical addr" },
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{ "punmap", CmdPageUnmap, "Unmap a page" },
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{ "pf", CmdPF, "Provoke a PF. Usage: pfault <address>"},
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