Shourya #3
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Shourya #3
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Since the job of a TLB is to deliver a physical frame number corresponding to a virtual page number, assume that the physical address is equal to the virtual address irrespective of the instruction type, i.e., read or write. This assumption is made for the simplicity of the simulation and is in fact technically inaccurate. Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
The TLB stores a bit describing the validity of a block. A block is
valid when it is filled in the TLB.
Introduce block validity by adding the boolean parameter 'is_valid' and
supply appropriate helper functions '{set,get}_block_validity()'.
Co-authored-by: Abhay Kumar <abhay98394@gmail.com>
Co-authored-by: Shourya Shukla <periperidip@gmail.com>
The TLB produces a physical frame number corresponding to a virtual page number iff a block is valid. Introduce the functionality in the form of an extra 'if' statement check. While at it, rename the function 'Set::set_block()' to 'Set::insert_block()' for clarity. Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
Rename the function 'set_block()' to 'insert_block()' for clarity. While at it, amend the usage of 'Set::insert_block()' as well. Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
To initialise a TLB block, the function 'Block::set()' was used. To avoid confusion with the set existing in cache terminologies, rename the function 'set()' to 'init()'. Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
To circumvent the sequential page table entry search, introduce 'get_frame_number_short()' which simply returns the frame number corresponding to a page number. This also significantly curtails the simulator runtime. Co-authored-by: Abhay Kumar <abhay98394@gmail.com> Co-authored-by: Shourya Shukla <periperidip@gmail.com>
A block is termed as 'valid' as soon as its entry is added in the TLB. Therefore, validate the block as soon as it is initialised using the 'Block::init()' function by setting 'is_valid' as true. Reported-by: Saksham Gupta <sakshamdam54321@gmail.com> Signed-off-by: Shourya Shukla <periperidip@gmail.com>
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