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nvmap: Return the address of the nvmap object when Freeing it for the last time.
This behavior is confirmed by reverse engineering.
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@ -148,6 +148,7 @@ u32 nvmap::IocParam(const std::vector<u8>& input, std::vector<u8>& output) {
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}
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u32 nvmap::IocFree(const std::vector<u8>& input, std::vector<u8>& output) {
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// TODO(Subv): These flags are unconfirmed.
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enum FreeFlags {
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Freed = 0,
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NotFreedYet = 1,
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@ -161,15 +162,21 @@ u32 nvmap::IocFree(const std::vector<u8>& input, std::vector<u8>& output) {
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auto itr = handles.find(params.handle);
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ASSERT(itr != handles.end());
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ASSERT(itr->second->refcount > 0);
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itr->second->refcount--;
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params.refcount = itr->second->refcount;
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params.size = itr->second->size;
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if (itr->second->refcount == 0)
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if (itr->second->refcount == 0) {
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params.flags = Freed;
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else
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// The address of the nvmap is written to the output if we're finally freeing it, otherwise
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// 0 is written.
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params.address = itr->second->addr;
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} else {
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params.flags = NotFreedYet;
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params.address = 0;
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}
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handles.erase(params.handle);
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@ -94,7 +94,7 @@ private:
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struct IocFreeParams {
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u32_le handle;
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INSERT_PADDING_BYTES(4);
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u64_le refcount;
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u64_le address;
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u32_le size;
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u32_le flags;
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};
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