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paging: fix free unused pte

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This commit is contained in:
Mathieu Maret 2018-11-15 22:53:27 +01:00
parent ea9e5f7f23
commit ac64b124da
1 changed files with 10 additions and 9 deletions
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19
core/paging.c
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@ -103,8 +103,8 @@ int pagingSetup(paddr_t upperKernelAddr)
}
pt[ptEntry].present = 1;
pt[ptEntry].write = 1; // TODO set Kernel code as RO
pt[ptEntry].paddr = i >> PAGE_SHIFT;
pt[ptEntry].write = 1; // TODO set Kernel code as RO
pt[ptEntry].paddr = i >> PAGE_SHIFT;
}
// Setup mirroring
@ -150,14 +150,15 @@ int pageMap(vaddr_t vaddr, paddr_t paddr, int flags)
__native_flush_tlb_single((vaddr_t)pt);
memset((void *)pt, 0, PAGE_SIZE);
}
} else {
// Already mapped ? Remove old mapping
if (pt[ptEntry].present) {
unrefPhyPage(pt[ptEntry].paddr << PAGE_SHIFT);
} // PTE not already used ? We will use it ! So increase the PT ref count
else {
refPhyPage(pd[pdEntry].pt_addr << PAGE_SHIFT);
// Already mapped ? Remove old mapping
if (pt[ptEntry].present) {
unrefPhyPage(pt[ptEntry].paddr << PAGE_SHIFT);
} // PTE not already used ? We will use it ! So increase the PT ref count
else {
refPhyPage(pd[pdEntry].pt_addr << PAGE_SHIFT);
}
}
pt[ptEntry].user = (flags & PAGING_MEM_USER) ? 1 : 0;