diff options
Diffstat (limited to 'sim/common/sim-config.h')
| -rw-r--r-- | sim/common/sim-config.h | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/sim/common/sim-config.h b/sim/common/sim-config.h index 59a8c37..cea3101 100644 --- a/sim/common/sim-config.h +++ b/sim/common/sim-config.h @@ -339,28 +339,22 @@ extern int current_environment; -/* Callback/Default Memory. +/* Callback & Modulo Memory. Core includes a builtin memory type (raw_memory) that is implemented using an array. raw_memory does not require any additional functions etc. Callback memory is where the core calls a core device for the data - it requires. + it requires. Callback memory can be layered using priorities. - Default memory is an extenstion of this where for addresses that do - not map into either a callback or core memory range a default map - can be used. + Modulo memory is a variation on raw_memory where ADDRESS & (MODULO + - 1) is used as the index into the memory array. - The OEA model uses callback memory for devices and default memory - for buses. + The OEA model uses callback memory for devices. The VEA model uses callback memory to capture `page faults'. - While it may be possible to eliminate callback/default memory (and - hence also eliminate an additional test per memory fetch) it - probably is not worth the effort. - BTW, while raw_memory could have been implemented as a callback, profiling has shown that there is a biger win (at least for the x86) in eliminating a function call for the most common @@ -370,6 +364,10 @@ extern int current_environment; #define WITH_CALLBACK_MEMORY 1 #endif +#ifndef WITH_MODULO_MEMORY +#define WITH_MODULO_MEMORY 0 +#endif + /* Alignment: @@ -399,6 +397,13 @@ extern enum sim_alignments current_alignment; #define WITH_ALIGNMENT NONSTRICT_ALIGNMENT #endif +#if !defined (WITH_DEFAULT_ALIGNMENT) +#define WITH_DEFAULT_ALIGNMENT 0 /* fatal */ +#endif + + + + #define CURRENT_ALIGNMENT (WITH_ALIGNMENT \ ? WITH_ALIGNMENT \ : current_alignment) |