69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
#include "addressspace.hpp"
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kernel::AddressSpace::AddressSpace(MemoryAllocator& malloc)
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: malloc(malloc)
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{
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this->pageTables = (PageTableEntry*) 0xFFC00000;
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this->pageDirectory = (PageTableEntry*) 0xFFFFF000;
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}
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int kernel::AddressSpace::mmap(void* start, size_t length)
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{
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size_t tableIndex = (size_t) start / 4096;
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for(int i = (int) length; i > 0; i -= 4096)
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{
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size_t directoryIndex = tableIndex / 1024;
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if(!pageDirectory[directoryIndex].getPresent())
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{
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physaddr_t newPT = malloc.allocate(4096);
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if(newPT == 0)
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return -1;
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pageDirectory[directoryIndex] = newPT;
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pageDirectory[directoryIndex].setPresent(true);
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pageDirectory[directoryIndex].setUsermode(false);
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pageDirectory[directoryIndex].setRw(true);
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}
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if(!pageTables[tableIndex].getPresent())
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{
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physaddr_t page = malloc.allocate(4096);
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pageTables[tableIndex] = page;
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pageTables[tableIndex].setUsermode(false);
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pageTables[tableIndex].setRw(true);
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pageTables[tableIndex].setPresent(true);
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}
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tableIndex++;
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}
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return 0;
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}
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int kernel::AddressSpace::munmap(void* start, size_t length)
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{
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if((size_t) start % 4096 != 0)
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return -1;
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size_t tableIndex = (size_t) start / 4096;
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for(int i = (int) length; i > 0; i -= 4096)
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{
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size_t directoryIndex = tableIndex / 1024;
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if(pageDirectory[directoryIndex].getPresent())
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{
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pageDirectory[directoryIndex] = 0;
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pageDirectory[directoryIndex].setPresent(false);
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pageDirectory[directoryIndex].setUsermode(false);
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pageDirectory[directoryIndex].setRw(false);
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}
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tableIndex++;
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}
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return 0;
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}
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physaddr_t kernel::AddressSpace::getPhysicalAddress(void* virtualAddress)
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const
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{
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size_t index = (size_t) virtualAddress / 4096;
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PageTableEntry pte = pageTables[index];
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if(pte.getPresent())
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return pte.getPhysicalAddress();
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else
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return 0;
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}
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