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TD3:I3 implements ReadAtVirtual()

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This commit is contained in:
Yorick Barbanneau 2021-12-06 00:36:40 +01:00
parent c35ccf876c
commit 8521a8b554
2 changed files with 56 additions and 6 deletions
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56
code/userprog/addrspace.cc
View file

@ -113,17 +113,37 @@ AddrSpace::AddrSpace (OpenFile * executable)
{
DEBUG ('a', "Initializing code segment, at 0x%x, size 0x%x\n",
noffH.code.virtualAddr, noffH.code.size);
executable->ReadAt (&(machine->mainMemory[noffH.code.virtualAddr]),
noffH.code.size, noffH.code.inFileAddr);
#ifdef CHANGED
ReadAtVirtual(
executable,
noffH.code.virtualAddr,
noffH.code.size,
noffH.code.inFileAddr,
pageTable,
numPages
);
#endif
// executable->ReadAt (&(machine->mainMemory[noffH.code.virtualAddr]),
// noffH.code.size, noffH.code.inFileAddr);
}
if (noffH.initData.size > 0)
{
DEBUG ('a', "Initializing data segment, at 0x%x, size 0x%x\n",
noffH.initData.virtualAddr, noffH.initData.size);
executable->ReadAt (&
(machine->mainMemory
[noffH.initData.virtualAddr]),
noffH.initData.size, noffH.initData.inFileAddr);
#ifdef CHANGED
ReadAtVirtual(
executable,
noffH.initData.virtualAddr,
noffH.initData.size,
noffH.initData.inFileAddr,
pageTable,
numPages
);
#endif
// executable->ReadAt (&
// (machine->mainMemory
// [noffH.initData.virtualAddr]),
// noffH.initData.size, noffH.initData.inFileAddr);
}
DEBUG ('a', "Area for stacks at 0x%x, size 0x%x\n",
@ -348,4 +368,28 @@ AddrSpace::DeAllocateUserStack(int addr){
memoryMap->Clear(bit);
semAllocateUserStack->V();
}
void
AddrSpace::ReadAtVirtual(OpenFile *executable,
int virtualaddr, int numBytes, int position, TranslationEntry *pageTable, unsigned int numPages) {
DEBUG('a',"ReadAtVirtual\n");
char buffer[numBytes];
int size = executable->ReadAt(&buffer, numBytes, position);
// Backup current page table
TranslationEntry *oldPageTable = machine->currentPageTable;
machine->currentPageTable = pageTable;
int oldPageTableSize = machine->currentPageTableSize;
machine->currentPageTableSize = numPages;
// Copy bytes from out buffet to our page
int i;
for(i=0;i<size;i++) {
machine->WriteMem(virtualaddr+i, 1, *(buffer+i));
}
// Get back our old page table
machine->currentPageTable = oldPageTable;
machine->currentPageTableSize = oldPageTableSize;
}
#endif

6
code/userprog/addrspace.h
View file

@ -54,12 +54,18 @@ class AddrSpace:public dontcopythis
BitMap * memoryMap;
int AllocateUserStack();
void DeAllocateUserStack(int addr);
#endif
private:
NoffHeader noffH; // Program layout
TranslationEntry * pageTable; // Page table
unsigned int numPages; // Number of pages in the page table
#ifdef CHANGED
static void ReadAtVirtual(OpenFile *executable,
int virtualaddr, int numBytes, int position, TranslationEntry *pageTable, unsigned int numPages);
#endif //CHANGED
};
extern List AddrspaceList;