Fri, 18 Jan 2013 17:18:50 +0000
[memory] Emulate main memory read wrap-around
3B1s with 512K or 1MB of base memory have a decoding quirk which causes reads
to 'wrap around'. That is to say, on a 512K machine, reading from addresses 0,
512K, 1024K or 1536K will address the same RAM byte. On a 1MB machine,
addresses 0 and 1024K address the same RAM byte.
Emulating this incorrectly causes P4TEST to report an incorrect amount of
available base RAM.
| philpem@0 | 1 | #ifndef SIM__HEADER |
| philpem@0 | 2 | #define SIM__HEADER |
| philpem@0 | 3 | |
| philpem@0 | 4 | unsigned int m68k_read_memory_8(unsigned int address); |
| philpem@0 | 5 | unsigned int m68k_read_memory_16(unsigned int address); |
| philpem@0 | 6 | unsigned int m68k_read_memory_32(unsigned int address); |
| philpem@0 | 7 | void m68k_write_memory_8(unsigned int address, unsigned int value); |
| philpem@0 | 8 | void m68k_write_memory_16(unsigned int address, unsigned int value); |
| philpem@0 | 9 | void m68k_write_memory_32(unsigned int address, unsigned int value); |
| philpem@0 | 10 | void cpu_pulse_reset(void); |
| philpem@0 | 11 | void cpu_set_fc(unsigned int fc); |
| philpem@0 | 12 | int cpu_irq_ack(int level); |
| philpem@0 | 13 | |
| philpem@0 | 14 | #endif /* SIM__HEADER */ |