Is the knock a thudding noise similar to someone pounding on a metal door or is it more of a rattling or chattering noise? If it is the thudding noise there is likely lower end engine damage. If is the chattering or rattling noise it may just be lack of oil to the upper end or head/s of the engine. How far have you driven it like this? If not very far it may have minimal damage that can be repaired by just installing a new oil pump, but if driven over a few miles like this it could be excessive and need new parts+repairs. The oil pump may not be easily changed but extra repairs are definitely going to cost more.
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