1 // See LICENSE for license details.
13 volatile bool ctrlc_pressed
= false;
14 static void handle_signal(int sig
)
19 signal(sig
, &handle_signal
);
22 sim_t::sim_t(const char* isa
, size_t nprocs
, size_t mem_mb
,
23 const std::vector
<std::string
>& args
)
24 : htif(new htif_isasim_t(this, args
)), procs(std::max(nprocs
, size_t(1))),
25 rtc(0), current_step(0), current_proc(0), debug(false)
27 signal(SIGINT
, &handle_signal
);
28 // allocate target machine's memory, shrinking it as necessary
29 // until the allocation succeeds
30 size_t memsz0
= (size_t)mem_mb
<< 20;
31 size_t quantum
= 1L << 20;
33 memsz0
= (size_t)((sizeof(size_t) == 8 ? 4096 : 2048) - 256) << 20;
36 while ((mem
= (char*)calloc(1, memsz
)) == NULL
)
37 memsz
= (size_t)(memsz
*0.9)/quantum
*quantum
;
40 fprintf(stderr
, "warning: only got %lu bytes of target mem (wanted %lu)\n",
41 (unsigned long)memsz
, (unsigned long)memsz0
);
43 debug_mmu
= new mmu_t(mem
, memsz
);
45 for (size_t i
= 0; i
< procs
.size(); i
++)
46 procs
[i
] = new processor_t(isa
, this, i
);
53 for (size_t i
= 0; i
< procs
.size(); i
++)
59 reg_t
sim_t::get_scr(int which
)
63 case 0: return procs
.size();
64 case 1: return memsz
>> 20;
72 set_procs_debug(true);
75 if (debug
|| ctrlc_pressed
)
80 return htif
->exit_code();
83 void sim_t::step(size_t n
)
85 for (size_t i
= 0, steps
= 0; i
< n
; i
+= steps
)
87 steps
= std::min(n
- i
, INTERLEAVE
- current_step
);
88 procs
[current_proc
]->step(steps
);
90 current_step
+= steps
;
91 if (current_step
== INTERLEAVE
)
94 procs
[current_proc
]->yield_load_reservation();
95 if (++current_proc
== procs
.size()) {
97 rtc
+= INTERLEAVE
/ INSNS_PER_RTC_TICK
;
105 bool sim_t::running()
107 for (size_t i
= 0; i
< procs
.size(); i
++)
108 if (procs
[i
]->running())
115 procs
[0]->state
.tohost
= 1;
120 void sim_t::set_debug(bool value
)
125 void sim_t::set_log(bool value
)
130 void sim_t::set_histogram(bool value
)
132 histogram_enabled
= value
;
133 for (size_t i
= 0; i
< procs
.size(); i
++) {
134 procs
[i
]->set_histogram(histogram_enabled
);
138 void sim_t::set_procs_debug(bool value
)
140 for (size_t i
=0; i
< procs
.size(); i
++)
141 procs
[i
]->set_debug(value
);
144 bool sim_t::mmio_load(reg_t addr
, size_t len
, uint8_t* bytes
)
146 if (addr
+ len
< addr
)
148 return bus
.load(addr
, len
, bytes
);
151 bool sim_t::mmio_store(reg_t addr
, size_t len
, const uint8_t* bytes
)
153 if (addr
+ len
< addr
)
155 return bus
.store(addr
, len
, bytes
);
158 void sim_t::make_config_string()
160 size_t csr_size
= NCSR
* 16 /* RV128 */;
161 size_t device_tree_addr
= memsz
;
162 size_t cpu_addr
= memsz
+ csr_size
;
173 " size 0x" << memsz
<< ";\n"
177 for (size_t i
= 0; i
< procs
.size(); i
++) {
180 " " << "0 {\n" << // hart 0 on core i
181 " isa " << procs
[i
]->isa_string
<< ";\n"
182 " addr 0x" << cpu_addr
<< ";\n"
185 bus
.add_device(cpu_addr
, procs
[i
]);
186 cpu_addr
+= csr_size
;
190 std::string str
= s
.str();
191 std::vector
<char> vec(str
.begin(), str
.end());
193 assert(vec
.size() <= csr_size
);
194 config_string
.reset(new rom_device_t(vec
));
195 bus
.add_device(memsz
, config_string
.get());