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Working on Paging API #67
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@ -14,8 +14,6 @@
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pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE)));
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ulong *MmPhysicalPageTable;
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extern MemoryMap_t memoryMap;
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extern ulong _text;
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extern ulong _text_end;
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extern ulong _rodata;
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@ -23,9 +21,11 @@ extern ulong _rodata_end;
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extern ulong _data;
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extern ulong _data_end;
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extern MemoryMap_t memoryMap;
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ulong MmStackGuards[2] = { 0 };
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ulong MmVirtLastAddress = 0;
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ulong MmPhysLastKernelAddress = 0;
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ulong MmPhysLastKernAddress = 0;
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enum
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{
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@ -59,8 +59,8 @@ 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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MmPhysLastKernelAddress = (ulong)(_heap_start + _heap_max);
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ulong diffKernUsr = (ulong)USERSPACE - MmPhysLastKernelAddress - KPAGESIZE;
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MmPhysLastKernAddress = (ulong)(_heap_start + _heap_max);
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ulong diffKernUsr = (ulong)USERSPACE - MmPhysLastKernAddress - KPAGESIZE;
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// Maximum VIRTUAL address in memory
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MmVirtLastAddress = phRamSize + diffKernUsr;
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@ -161,22 +161,22 @@ void MmInitPaging(void)
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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 <= MmPhysLastKernelAddress) {
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else if ((ulong)curAddrPT <= MmPhysLastKernAddress) {
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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 == MmPhysLastKernelAddress) {
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if ((ulong)curAddrPT == MmPhysLastKernAddress) {
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//DebugLog("\tLast page of kernel at %p\n", curAddrPT);
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}
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}
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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); // Not present for instance, unallocated
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MmPT[index] = ((ulong)curAddrPT - diffKernUsr) | PRESENT; // Not present for instance
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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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DebugLog("\tUserspace at %p:%p\n", curAddrPT, curAddrPT - diffKernUsr);
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}
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}
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else {
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@ -229,7 +229,7 @@ void *MmTransVirtToPhyAddr(void* virtualAddr)
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ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
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pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr);
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if (*page & PRESENT) {
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if (*page == (*page & ~(KPAGESIZE - 1))) {
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return NULL;
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}
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@ -241,7 +241,7 @@ void *MmTransPhyToVirtAddr(void* 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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] + ((ulong)physicalAddr - phyAddrPage));
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}
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//
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@ -287,13 +287,13 @@ void MmUnmapPage(void* virtualAddr)
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{
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pte_t *page = MmGetPageDescriptorFromVirtual(virtualAddr);
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*page &= (~PRESENT);
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*page = 0;
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KeFlushTlbSingle(*page);
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}
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//
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// Find physical unallocated pages
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// Find a free block of pages
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//
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void *MmGetPhyPageBlock(size_t size, bool usermode) {
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void *startPhyPage = 0;
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@ -307,7 +307,7 @@ void *MmGetPhyPageBlock(size_t size, bool usermode) {
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if (!usermode) {
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startPhyPage = MmTransVirtToPhyAddr((void*)KPAGESIZE + 1);
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endPhyPage = (void*)MmPhysLastKernelAddress;
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endPhyPage = (void*)MmPhysLastKernAddress;
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} else {
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startPhyPage = MmTransVirtToPhyAddr((void*)USERSPACE);
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endPhyPage = (void*)(phRamSize & ~(KPAGESIZE - 1));
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