diff options
Diffstat (limited to 'inc')
| -rw-r--r-- | inc/id.h | 45 | ||||
| -rw-r--r-- | inc/stage.h | 53 |
2 files changed, 53 insertions, 45 deletions
@@ -34,7 +34,42 @@ class ID : public Stage void get_instr_fields( signed int &s1, signed int &s2, signed int &s3, Mnemonic &m); + /* The following methods are made public so that they may be tested, and are + * not to be called from outside classes during standard execution. + */ + + /** + * Facilitates register checkout and data hazard management. + * 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 read_guard(signed int &r); + /** + * Facilitates register checkout and data hazard management. + * Checks out a register and returns it. + * + * @param the registers number, to be dereferenced and checked out. + */ + void write_guard(signed int &r); + private: + // TODO write me + /** + * Helper for `` + * Attempts to parse and dereference instruction arguments. If a desc + + * @param the resulting first field. To call this function properly, this + * field must contain the section of the instruction to be parsed. + * @param the resulting second field. + * @param the resulting third field. + */ + void decode_R_type(signed int &s1, signed int &s2, signed int &s3); + void decode_I_type(signed int &s1, signed int &s2, signed int &s3); + void decode_J_type(signed int &s1, signed int &s2); /** * Helper for `get_instr_fields`. * Given a raw instruction, returns the mnemonic and type. @@ -44,14 +79,6 @@ class ID : public Stage * @param the resulting type. */ void split_instr(signed int &raw, unsigned int &type, Mnemonic &m); - /** - * Facilitates checking out a register by dereferencing the register - specified by the first parameter. Registers that are checked out cannot be - checked out until they are checked in. - * @param - * @return the contents of the register. - */ - Response dereference_register(signed int &); }; -#endif /* ID_D_INCLUDED */ +#endif /* ID_H_INCLUDED */ diff --git a/inc/stage.h b/inc/stage.h index ff4455b..19e3896 100644 --- a/inc/stage.h +++ b/inc/stage.h @@ -6,7 +6,7 @@ #include "response.h" #include "storage.h" #include <array> -#include <set> +#include <deque> #include <memory> class Stage @@ -31,15 +31,18 @@ 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. + * 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(signed int r); + /** + * Returns the value of the register corresponding to `v`. + * @param the register number. + * @return the value in the associated register. */ - Response check_out(unsigned int &r); + signed int dereference_register(signed int v); /** * The name of the pipeline stage. */ @@ -68,6 +71,11 @@ class Stage * The current clock cycle. */ static int clock_cycle; + // TODO fix this comment after writeback stage + /** + * The set of registers currently checked out. + */ + static std::deque<signed int> checked_out; /** * A pointer to the next stage in the pipeline. */ @@ -80,33 +88,6 @@ class Stage * The current status of this stage. */ Response status; - - 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 */ |