C extension support - #22
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Implementation of state machine to handle mis-aligned memory access that may arise due to Compressed instructions. Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Implement 16-bit to 32-bit decoder for Compressed Instructions Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
This incorporates instruction re-alignment and its decompression. Only active whem Compressed Instruction encounters. Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
add `if_stall` and `comp_ack` to the interface. These are used by pre-fetch interface for C inrtuctions Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
- Allow pc+2 increment in case Compressed instruction encounters - stop mis-aligned memory access exception when half-word (pc+2) memory accessed. - add if_stall signal to ICache interface for pre-fetch control Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
This is only active when Compressed Instruction encounters. Otherwise, it will just pass through signals b/w IF and Icache. Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Make code style consistent with existing code base Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Compressed Extension Support in Pcore
arch-tests assumes that mtval should set with instruction address on ebreak, however RISC-V privilege spec provide choice whether to set 0 or faulty address in mtval. This change is to make pcore consistent with ACTs. Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Fix: hello and linux example programs working with compressed extension when simulated using verilator Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Updates the decompress module. Fix synthesis related errors of multi-driven signals Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Update Pre-fetch stage
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Add extra state to avoid unncessary stalls when switching from Compressed to Uncompressed instructions and vice versa, when there is no flow control i.e branhc or jump Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>
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fence.ifix.Edit:
The Linux kernel working on FPGA with C ext support
Fix: halt the icache request on tlb flush