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New dynamic paging implementation (3) #67
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@ -36,6 +36,8 @@ enum
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NX = 1UL << 63
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};
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//-----------
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//
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// Creates our new page table structure and loads it
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//
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@ -177,26 +179,38 @@ void MmInitPaging(void)
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DebugLog("\tPage table size : %u MB\n", (lastDirectoryAddr - firstDirectoryAddr)/MB);
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}
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//
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// Get a page from an address
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//
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static pte_t MmGetPageDescriptor(void *virtualAddr)
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{
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ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
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if (virtAddrPage > MmVirtLastAddress) {
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KeStartPanic("MmSetPage() Out of bound of the address space !");
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}
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pdpe_t *pdp = (pdpe_t*)((ulong)MmPageMapLevel4[(virtAddrPage / ((ulong)KPAGESIZE * 0x8000000)) % 512] & ~(KPAGESIZE - 1));
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//DebugLog("pdp\t: %p\n", pdp);
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pde_t *pd = (pde_t*)( (ulong)pdp[(virtAddrPage / ((ulong)KPAGESIZE * 0x40000)) % 512] & ~(KPAGESIZE - 1));
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//DebugLog("pd\t: %p\n", pd);
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pte_t *pt = (pte_t*)( (ulong)pd[(virtAddrPage / ((ulong)KPAGESIZE * 0x200)) % 512] & ~(KPAGESIZE - 1));
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//DebugLog("pt\t: %p\n", pt);
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ulong page = (ulong)pt[(virtAddrPage / ((ulong)KPAGESIZE)) % 512];
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//DebugLog("page (with flags): %p\n", page);
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return page;
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}
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//
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// Translates a virtual address to its physical equivalent
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//
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void *MmTransVirtToPhyAddr(void* virtualAddr)
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{
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ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
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if (virtAddrPage > MmVirtLastAddress) {
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KeStartPanic("MmTransVirtToPhyAddr() Out of bound of the address space !");
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}
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pdpe_t *pdp = (pdpe_t*)((ulong)MmPageMapLevel4[(virtAddrPage / ((ulong)KPAGESIZE * 0x8000000)) % 512] & ~(KPAGESIZE - 1));
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DebugLog("pdp\t: %p\n", pdp);
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pde_t *pd = (pde_t*)( (ulong)pdp[(virtAddrPage / ((ulong)KPAGESIZE * 0x40000)) % 512] & ~(KPAGESIZE - 1));
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DebugLog("pd\t: %p\n", pd);
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pte_t *pt = (pte_t*)( (ulong)pd[(virtAddrPage / ((ulong)KPAGESIZE * 0x200)) % 512] & ~(KPAGESIZE - 1));
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DebugLog("pt\t: %p\n", pt);
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ulong page = (ulong)pt[(virtAddrPage / ((ulong)KPAGESIZE)) % 512];
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DebugLog("page (with flags): %p\n", page);
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pte_t page = MmGetPageDescriptor(virtualAddr);
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if (page == (page & ~(KPAGESIZE - 1))) {
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return NULL;
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@ -215,19 +229,11 @@ void *MmTransPhyToVirtAddr(void* physicalAddr)
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//
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void MmSetPage(void* virtualAddr, ulong flags)
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{
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ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
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pte_t page = MmGetPageDescriptor(virtualAddr);
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if (virtAddrPage > MmVirtLastAddress) {
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KeStartPanic("MmSetPage() Out of bound of the address space !");
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}
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page |= flags;
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pdpe_t *pdp = (pdpe_t*)((ulong)MmPageMapLevel4[virtAddrPage / ((ulong)KPAGESIZE * 0x8000000)] & ~(KPAGESIZE - 1));
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pde_t *pd = (pde_t*)( (ulong)pdp[virtAddrPage / ((ulong)KPAGESIZE * 0x40000)] & ~(KPAGESIZE - 1));
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pte_t *pt = (pte_t*)( (ulong)pd[virtAddrPage / ((ulong)KPAGESIZE * 0x200)] & ~(KPAGESIZE - 1));
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pt[virtAddrPage / ((ulong)KPAGESIZE)] |= flags;
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KeFlushTlbSingle(virtAddrPage);
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KeFlushTlbSingle(page);
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}
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//
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@ -235,21 +241,31 @@ void MmSetPage(void* virtualAddr, ulong flags)
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//
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void MmUnsetPage(void* virtualAddr, ulong flags)
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{
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ulong virtAddrPage = (ulong)virtualAddr & ( ~(KPAGESIZE - 1));
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pte_t page = MmGetPageDescriptor(virtualAddr);
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if (virtAddrPage > MmVirtLastAddress) {
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KeStartPanic("MmUnsetPage() Out of bound of the address space !");
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}
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page &= (~flags);
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pdpe_t *pdp = (pdpe_t*)((ulong)MmPageMapLevel4[virtAddrPage / ((ulong)KPAGESIZE * 0x8000000)] & ~(KPAGESIZE - 1));
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pde_t *pd = (pde_t*)( (ulong)pdp[virtAddrPage / ((ulong)KPAGESIZE * 0x40000)] & ~(KPAGESIZE - 1));
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pte_t *pt = (pte_t*)( (ulong)pd[virtAddrPage / ((ulong)KPAGESIZE * 0x200)] & ~(KPAGESIZE - 1));
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pt[virtAddrPage / ((ulong)KPAGESIZE)] &= (~flags);
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KeFlushTlbSingle(virtAddrPage);
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KeFlushTlbSingle(page);
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}
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//
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// Map a page in memory
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//
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void MmMapPage(void* virtualAddr, void* physicalAddr, ulong flags)
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{
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}
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//
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// Unmap a page in memory
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//
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void MmUnmapPage(void* virtualAddr)
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{
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}
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//-----------
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//
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// Returns the rank of the Stack Guards
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//
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