Generic memory transaction.
This type is kept in sync with the emulator core. The layout is guaranteed. and will remain as is, although more fields may be added (at the bottom).
When the emulator core issues a memory transaction (assuming no ATC hit), the core allocates this structure on the stack and fills in some of the fields with default values. The memory transaction is passed by pointer or reference. By filling in the different fields you can adapt the result of the memory transaction.
Definition at line 57 of file Memory.h.
void* temu_MemTransaction::Initiator |
Initiator of the transaction (a CPU object). It can be null, which indicate that the transaction was not initiated by normal CPU activity (e.g. fetch, read or write). When the initiator is null, models should not attempt to stop the processor core, go to idle mode or raise traps (posting events is fine). An example when the initiator is null is when an MMU does a table walk. The MMU will normally special case handle table walks which access un-mapped memory.
Definition at line 95 of file Memory.h.
uint8_t temu_MemTransaction::Size |
Two-logarithm of the size of the transaction in bytes it is at most the size of the CPUs max bus size. In case of SPARCv8, this is 4 bytes (double words are issued as two accesses). As this is the 2-log of the size in bytes, a single byte access will have a size of 0, a 2 byte transaction will have size 1, a 4 byte transaction will have size 2 and an 8 byte transaction will have size 3.
Definition at line 73 of file Memory.h.