diff options
Diffstat (limited to 'inc/stage.h')
| -rw-r--r-- | inc/stage.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/inc/stage.h b/inc/stage.h index 50c413a..56a3589 100644 --- a/inc/stage.h +++ b/inc/stage.h @@ -9,6 +9,13 @@ #include <deque> #include <memory> +enum CC { + GT, + EQ, + UF, + OF, +}; + class Stage { public: @@ -21,16 +28,37 @@ class Stage virtual ~Stage(); /** * Advances this stage by a single clock cycle. + * A boilerplate version is provided in stage.cc. + * * @param a DTO object containing the next instruction to be processed. * @param a response, indicating whether or not the parent pipe stage is * ready to accept a new instruction object next cycle. * @return a response, indicating whether this pipeline stage is stalling, * busy, or done. + * + * Must set the status to STALLED when an operation completes. */ - virtual InstrDTO *advance(Response p) = 0; + virtual InstrDTO *advance(Response p); protected: /** + * The function expected to do the majority of the work. + * + * Must set the status to OK when an operation is ready. + */ + virtual void advance_helper() = 0; + /** + * Sets the bit in the condition code register corresponding to `c`. + * @param the condition code to set. + * @param the truthy value to set it to. + */ + void set_condition(CC c, bool v); + /** + * Gets the bit in the condition code register correspondng to `c`. + * @param the condition code to retrieve, + */ + bool get_condition(CC c); + /** * Helper for `check_out`. * Returns true if r are not checked out, false otherwise. * @param a list of register numbers. |