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arm64: Implement VMSAv8TranslationMap::Protect in terms of ProcessRange.

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Change-Id: I2825d265fec69c2ae033ee09ff0ead9b098a7ca9
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8160
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Fredrik Holmqvist <[email protected]>
This commit is contained in:
Owen Anderson
2024-09-01 22:48:50 +00:00
committed by waddlesplash
parent 744bdd7337
commit f73ff202af
1 changed files with 18 additions and 3 deletions
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src/system/kernel/arch/arm64/VMSAv8TranslationMap.cpp
+18 -3
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@@ -801,7 +801,7 @@ status_t
VMSAv8TranslationMap::Protect(addr_t start, addr_t end, uint32 attributes, uint32 memoryType)
{
ThreadCPUPinner pinner(thread_get_current_thread());
uint64_t attr = GetMemoryAttr(attributes, memoryType, fIsKernel);
size_t size = end - start + 1;
uint64_t pageMask = (1UL << fPageBits) - 1;
@@ -811,8 +811,23 @@ VMSAv8TranslationMap::Protect(addr_t start, addr_t end, uint32 attributes, uint3
ASSERT((size & pageMask) == 0);
ASSERT(ValidateVa(start));
uint64_t attr = GetMemoryAttr(attributes, memoryType, fIsKernel);
MapRange(fPageTable, fInitialLevel, start & vaMask, 0, size, VMAction::SET_ATTR, attr, NULL);
ProcessRange(fPageTable, 0, start & vaMask, size, nullptr,
[=](uint64_t* ptePtr, uint64_t effectiveVa) {
// We need to use an atomic compare-swap loop because we must
// need to clear somes bits while setting others.
while (true) {
uint64_t oldPte = atomic_get64((int64_t*)ptePtr);
uint64_t newPte = oldPte & ~kPteAttrMask;
newPte |= attr;
if ((uint64_t)atomic_test_and_set64((int64_t*)ptePtr, newPte, oldPte) == oldPte) {
asm("dsb ishst"); // Ensure PTE write completed
if ((oldPte & kAttrAF) != 0)
FlushVAFromTLBByASID(effectiveVa);
break;
}
}
});
return B_OK;
}