diff options
Diffstat (limited to 'src/mem')
| -rw-r--r-- | src/mem/request.hh | 239 |
1 files changed, 127 insertions, 112 deletions
diff --git a/src/mem/request.hh b/src/mem/request.hh index 5a2130029..cf8d27939 100644 --- a/src/mem/request.hh +++ b/src/mem/request.hh @@ -89,97 +89,109 @@ class Request typedef uint8_t ArchFlagsType; typedef ::Flags<FlagsType> Flags; - /** - * Architecture specific flags. - * - * These bits int the flag field are reserved for - * architecture-specific code. For example, SPARC uses them to - * represent ASIs. - */ - static const FlagsType ARCH_BITS = 0x000000FF; - /** The request was an instruction fetch. */ - static const FlagsType INST_FETCH = 0x00000100; - /** The virtual address is also the physical address. */ - static const FlagsType PHYSICAL = 0x00000200; - /** - * The request is to an uncacheable address. - * - * @note Uncacheable accesses may be reordered by CPU models. The - * STRICT_ORDER flag should be set if such reordering is - * undesirable. - */ - static const FlagsType UNCACHEABLE = 0x00000400; - /** - * The request is required to be strictly ordered by <i>CPU - * models</i> and is non-speculative. - * - * A strictly ordered request is guaranteed to never be re-ordered - * or executed speculatively by a CPU model. The memory system may - * still reorder requests in caches unless the UNCACHEABLE flag is - * set as well. - */ - static const FlagsType STRICT_ORDER = 0x00000800; - /** This request is to a memory mapped register. */ - static const FlagsType MMAPPED_IPR = 0x00002000; - /** This request is a clear exclusive. */ - static const FlagsType CLEAR_LL = 0x00004000; - /** This request is made in privileged mode. */ - static const FlagsType PRIVILEGED = 0x00008000; - - /** This is a write that is targeted and zeroing an entire cache block. - * There is no need for a read/modify/write - */ - static const FlagsType CACHE_BLOCK_ZERO = 0x00010000; - - /** The request should not cause a memory access. */ - static const FlagsType NO_ACCESS = 0x00080000; - /** This request will lock or unlock the accessed memory. When used with - * a load, the access locks the particular chunk of memory. When used - * with a store, it unlocks. The rule is that locked accesses have to be - * made up of a locked load, some operation on the data, and then a locked - * store. - */ - static const FlagsType LOCKED_RMW = 0x00100000; - /** The request is a Load locked/store conditional. */ - static const FlagsType LLSC = 0x00200000; - /** This request is for a memory swap. */ - static const FlagsType MEM_SWAP = 0x00400000; - static const FlagsType MEM_SWAP_COND = 0x00800000; - - /** The request is a prefetch. */ - static const FlagsType PREFETCH = 0x01000000; - /** The request should be prefetched into the exclusive state. */ - static const FlagsType PF_EXCLUSIVE = 0x02000000; - /** The request should be marked as LRU. */ - static const FlagsType EVICT_NEXT = 0x04000000; - - /** The request should be handled by the generic IPR code (only - * valid together with MMAPPED_IPR) */ - static const FlagsType GENERIC_IPR = 0x08000000; - - /** The request targets the secure memory space. */ - static const FlagsType SECURE = 0x10000000; - /** The request is a page table walk */ - static const FlagsType PT_WALK = 0x20000000; - - /** These flags are *not* cleared when a Request object is reused - (assigned a new address). */ - static const FlagsType STICKY_FLAGS = INST_FETCH; - - /** Request Ids that are statically allocated + enum : FlagsType { + /** + * Architecture specific flags. + * + * These bits int the flag field are reserved for + * architecture-specific code. For example, SPARC uses them to + * represent ASIs. + */ + ARCH_BITS = 0x000000FF, + /** The request was an instruction fetch. */ + INST_FETCH = 0x00000100, + /** The virtual address is also the physical address. */ + PHYSICAL = 0x00000200, + /** + * The request is to an uncacheable address. + * + * @note Uncacheable accesses may be reordered by CPU models. The + * STRICT_ORDER flag should be set if such reordering is + * undesirable. + */ + UNCACHEABLE = 0x00000400, + /** + * The request is required to be strictly ordered by <i>CPU + * models</i> and is non-speculative. + * + * A strictly ordered request is guaranteed to never be + * re-ordered or executed speculatively by a CPU model. The + * memory system may still reorder requests in caches unless + * the UNCACHEABLE flag is set as well. + */ + STRICT_ORDER = 0x00000800, + /** This request is to a memory mapped register. */ + MMAPPED_IPR = 0x00002000, + /** This request is a clear exclusive. */ + CLEAR_LL = 0x00004000, + /** This request is made in privileged mode. */ + PRIVILEGED = 0x00008000, + + /** + * This is a write that is targeted and zeroing an entire + * cache block. There is no need for a read/modify/write + */ + CACHE_BLOCK_ZERO = 0x00010000, + + /** The request should not cause a memory access. */ + NO_ACCESS = 0x00080000, + /** + * This request will lock or unlock the accessed memory. When + * used with a load, the access locks the particular chunk of + * memory. When used with a store, it unlocks. The rule is + * that locked accesses have to be made up of a locked load, + * some operation on the data, and then a locked store. + */ + LOCKED_RMW = 0x00100000, + /** The request is a Load locked/store conditional. */ + LLSC = 0x00200000, + /** This request is for a memory swap. */ + MEM_SWAP = 0x00400000, + MEM_SWAP_COND = 0x00800000, + + /** The request is a prefetch. */ + PREFETCH = 0x01000000, + /** The request should be prefetched into the exclusive state. */ + PF_EXCLUSIVE = 0x02000000, + /** The request should be marked as LRU. */ + EVICT_NEXT = 0x04000000, + + /** + * The request should be handled by the generic IPR code (only + * valid together with MMAPPED_IPR) + */ + GENERIC_IPR = 0x08000000, + + /** The request targets the secure memory space. */ + SECURE = 0x10000000, + /** The request is a page table walk */ + PT_WALK = 0x20000000, + + /** + * These flags are *not* cleared when a Request object is + * reused (assigned a new address). + */ + STICKY_FLAGS = INST_FETCH + }; + + /** Master Ids that are statically allocated * @{*/ - /** This request id is used for writeback requests by the caches */ - static const MasterID wbMasterId = 0; - /** This request id is used for functional requests that don't come from a - * particular device - */ - static const MasterID funcMasterId = 1; - /** This request id is used for message signaled interrupts */ - static const MasterID intMasterId = 2; - /** Invalid request id for assertion checking only. It is invalid behavior - * to ever send this id as part of a request. - * @todo C++1x replace with numeric_limits when constexpr is added */ - static const MasterID invldMasterId = std::numeric_limits<MasterID>::max(); + enum : MasterID { + /** This master id is used for writeback requests by the caches */ + wbMasterId = 0, + /** + * This master id is used for functional requests that + * don't come from a particular device + */ + funcMasterId = 1, + /** This master id is used for message signaled interrupts */ + intMasterId = 2, + /** + * Invalid master id for assertion checking only. It is + * invalid behavior to ever send this id as part of a request. + */ + invldMasterId = std::numeric_limits<MasterID>::max() + }; /** @} */ /** Invalid or unknown Pid. Possible when operating system is not present @@ -190,24 +202,27 @@ class Request typedef uint8_t PrivateFlagsType; typedef ::Flags<PrivateFlagsType> PrivateFlags; - /** Whether or not the size is valid. */ - static const PrivateFlagsType VALID_SIZE = 0x00000001; - /** Whether or not paddr is valid (has been written yet). */ - static const PrivateFlagsType VALID_PADDR = 0x00000002; - /** Whether or not the vaddr & asid are valid. */ - static const PrivateFlagsType VALID_VADDR = 0x00000004; - /** Whether or not the pc is valid. */ - static const PrivateFlagsType VALID_PC = 0x00000010; - /** Whether or not the context ID is valid. */ - static const PrivateFlagsType VALID_CONTEXT_ID = 0x00000020; - static const PrivateFlagsType VALID_THREAD_ID = 0x00000040; - /** Whether or not the sc result is valid. */ - static const PrivateFlagsType VALID_EXTRA_DATA = 0x00000080; - - /** These flags are *not* cleared when a Request object is reused - (assigned a new address). */ - static const PrivateFlagsType STICKY_PRIVATE_FLAGS = - VALID_CONTEXT_ID | VALID_THREAD_ID; + enum : PrivateFlagsType { + /** Whether or not the size is valid. */ + VALID_SIZE = 0x00000001, + /** Whether or not paddr is valid (has been written yet). */ + VALID_PADDR = 0x00000002, + /** Whether or not the vaddr & asid are valid. */ + VALID_VADDR = 0x00000004, + /** Whether or not the pc is valid. */ + VALID_PC = 0x00000010, + /** Whether or not the context ID is valid. */ + VALID_CONTEXT_ID = 0x00000020, + VALID_THREAD_ID = 0x00000040, + /** Whether or not the sc result is valid. */ + VALID_EXTRA_DATA = 0x00000080, + + /** + * These flags are *not* cleared when a Request object is reused + * (assigned a new address). + */ + STICKY_PRIVATE_FLAGS = VALID_CONTEXT_ID | VALID_THREAD_ID + }; private: @@ -480,9 +495,9 @@ class Request } /** Note that unlike other accessors, this function sets *specific - flags* (ORs them in); it does not assign its argument to the - _flags field. Thus this method should rightly be called - setFlags() and not just flags(). */ + flags* (ORs them in); it does not assign its argument to the + _flags field. Thus this method should rightly be called + setFlags() and not just flags(). */ void setFlags(Flags flags) { @@ -632,7 +647,7 @@ class Request Tick getAccessLatency() const { return accessDelta; } /** Accessor functions for flags. Note that these are for testing - only; setting flags should be done via setFlags(). */ + only; setting flags should be done via setFlags(). */ bool isUncacheable() const { return _flags.isSet(UNCACHEABLE); } bool isStrictlyOrdered() const { return _flags.isSet(STRICT_ORDER); } bool isInstFetch() const { return _flags.isSet(INST_FETCH); } |