diff options
Diffstat (limited to 'inc/stage.h')
| -rw-r--r-- | inc/stage.h | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/inc/stage.h b/inc/stage.h index f6bad41..0348263 100644 --- a/inc/stage.h +++ b/inc/stage.h @@ -1,11 +1,12 @@ #ifndef STAGE_H #define STAGE_H +#include "accessor.h" #include "definitions.h" #include "instrDTO.h" #include "response.h" #include "storage.h" -#include "accessor.h" #include <array> +#include <set> class Stage { @@ -28,6 +29,16 @@ class Stage protected: /** + * Facilitates register checkout. + * It does this by checking that the register passed in is not currently + * checked out. If true, then replaces r with the value of the register and + * returns OK. If false, returns STALLED. + * + * @param the registers number, to be dereferenced. + * @return OK if `r` is not checked out, STALLED otherwise. + */ + Response check_out(unsigned int &r); + /** * The name of the pipeline stage. */ Accessor id; @@ -59,6 +70,33 @@ class Stage * The current clock cycle. */ static int clock_cycle; + + private: + /** + * Helper for `check_out`. + * Returns true if r are not checked out, false otherwise. + * @param a list of register numbers. + * @return true if registers are not in checked_out, false otherwise. + */ + bool is_checked_out(unsigned int r); + /** + * Helper for `check_out`. + * Checks out a single register, and places it in checked_out. + * @param a register number. + * @return the value in the register. + */ + signed int check_out_register(unsigned int r); + // TODO fix this comment after writeback stage + /** + * Helper for `check_out_register` + * @param the register number. + * @return the value in the associated register. + */ + signed int dereference_register(unsigned int r); + /** + * The set of registers currently checked out. + */ + static std::set<unsigned int> checked_out; }; #endif /* STAGE_H_INCLUDED */ |