diff options
| author | Alejandro Soto <alejandro@34project.org> | 2022-11-16 18:37:59 -0600 |
|---|---|---|
| committer | Alejandro Soto <alejandro@34project.org> | 2022-11-16 23:32:24 -0600 |
| commit | 739a690947165c4c319d2dbd76d4368bf4b59b5a (patch) | |
| tree | 7d496634c687205a6b515f697a098b38db640045 /rtl/core/control/cycles.sv | |
| parent | 08357c4ae9e88b6d629a2942a9128f2049c42ba9 (diff) | |
Implement privilege escalation
Diffstat (limited to 'rtl/core/control/cycles.sv')
| -rw-r--r-- | rtl/core/control/cycles.sv | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/rtl/core/control/cycles.sv b/rtl/core/control/cycles.sv index b7a7829..198c03b 100644 --- a/rtl/core/control/cycles.sv +++ b/rtl/core/control/cycles.sv @@ -37,6 +37,7 @@ module core_control_cycles WITH_SHIFT, TRANSFER, BASE_WRITEBACK, + ESCALATE, EXCEPTION, MUL, MUL_ACC_LD, @@ -51,6 +52,7 @@ module core_control_cycles assign cycle.with_shift = state == WITH_SHIFT; assign cycle.transfer = state == TRANSFER; assign cycle.base_writeback = state == BASE_WRITEBACK; + assign cycle.escalate = state == ESCALATE; assign cycle.exception = state == EXCEPTION; assign cycle.mul = state == MUL; assign cycle.mul_acc_ld = state == MUL_ACC_LD; @@ -62,6 +64,7 @@ module core_control_cycles assign next_cycle.with_shift = next_state == WITH_SHIFT; assign next_cycle.transfer = next_state == TRANSFER; assign next_cycle.base_writeback = next_state == BASE_WRITEBACK; + assign next_cycle.escalate = next_state == ESCALATE; assign next_cycle.exception = next_state == EXCEPTION; assign next_cycle.mul = next_state == MUL; assign next_cycle.mul_acc_ld = next_state == MUL_ACC_LD; @@ -74,7 +77,7 @@ module core_control_cycles unique case(state) ISSUE: if(exception) - next_state = EXCEPTION; + next_state = ESCALATE; else if(halt) next_state = ISSUE; else if(mul) @@ -88,6 +91,9 @@ module core_control_cycles if(!trivial_shift) next_state = WITH_SHIFT; + ESCALATE: + next_state = EXCEPTION; + TRANSFER: if(!mem_ready || pop_valid) next_state = TRANSFER; |