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Bug fix in munmap: PDEs were mistakenly updated

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This commit is contained in:
Nathan Giddings
2020-08-01 16:12:03 -05:00
parent f8a4b0b1e4
commit fec2817883
1 changed files with 10 additions and 8 deletions
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18
src/mmgr/x86/mmap.cpp
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@@ -48,10 +48,10 @@ int kernel::munmap(MemoryAllocator& allocator, void* start, size_t length)
size_t directoryIndex = tableIndex / 1024;
if(pageDirectory[directoryIndex].getPresent())
{
pageDirectory[directoryIndex] = 0;
pageDirectory[directoryIndex].setPresent(false);
pageDirectory[directoryIndex].setUsermode(false);
pageDirectory[directoryIndex].setRw(false);
pageTables[tableIndex] = 0;
pageTables[tableIndex].setPresent(false);
pageTables[tableIndex].setUsermode(false);
pageTables[tableIndex].setRw(false);
}
tableIndex++;
}
@@ -75,24 +75,26 @@ physaddr_t kernel::getPhysicalAddress(void* addr)
{
PageTableEntry* pageTables = (PageTableEntry*) 0xFFC00000;
size_t tableIndex = (size_t) addr / 4096;
return pageTables[tableIndex].getPhysicalAddress() + (size_t) addr & 0xFFF;
return pageTables[tableIndex].getPhysicalAddress() + ((size_t) addr & 0xFFF);
}
int kernel::createAddressSpace(void* table)
{
if((size_t) table & 0xFFF != 0)
if(((size_t) table & 0xFFF) != 0)
return -1;
PageTableEntry* pageDirectory = (PageTableEntry*) 0xFFFFF000;
PageTableEntry* newDirectory = (PageTableEntry*) table;
newDirectory[1022] = pageDirectory[1022];
newDirectory[1023] = pageDirectory[1023];
return 0;
}
int kernel::loadAddressSpace(physaddr_t table)
{
if(table & 0xFFF != 0)
if((table & 0xFFF) != 0)
return -1;
asm("mov %0, %cr3"
asm("mov %0, %%cr3"
:
: "r" (table));
return 0;
}