+// See LICENSE for license details.
+
#include "sim.h"
+#include "mmu.h"
#include "htif.h"
-#include <sys/mman.h>
#include <map>
#include <iostream>
+#include <sstream>
#include <climits>
-#include <assert.h>
-#include <unistd.h>
+#include <cstdlib>
+#include <cassert>
+#include <signal.h>
-#ifdef __linux__
-# define mmap mmap64
-#endif
+volatile bool ctrlc_pressed = false;
+static void handle_signal(int sig)
+{
+ if (ctrlc_pressed)
+ exit(-1);
+ ctrlc_pressed = true;
+ signal(sig, &handle_signal);
+}
-sim_t::sim_t(int _nprocs, int mem_mb, const std::vector<std::string>& args)
- : htif(new htif_isasim_t(this, args)),
- procs(_nprocs)
+sim_t::sim_t(const char* isa, size_t nprocs, size_t mem_mb, bool halted,
+ const std::vector<std::string>& args)
+ : htif(new htif_isasim_t(this, args)), procs(std::max(nprocs, size_t(1))),
+ current_step(0), current_proc(0), debug(false)
{
+ signal(SIGINT, &handle_signal);
// allocate target machine's memory, shrinking it as necessary
// until the allocation succeeds
size_t memsz0 = (size_t)mem_mb << 20;
+ size_t quantum = 1L << 20;
if (memsz0 == 0)
- memsz0 = 1L << (sizeof(size_t) == 8 ? 32 : 30);
-
- size_t quantum = std::max(PGSIZE, (reg_t)sysconf(_SC_PAGESIZE));
- memsz0 = memsz0/quantum*quantum;
+ memsz0 = (size_t)((sizeof(size_t) == 8 ? 4096 : 2048) - 256) << 20;
memsz = memsz0;
- mem = (char*)mmap(NULL, memsz, PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
+ while ((mem = (char*)calloc(1, memsz)) == NULL)
+ memsz = (size_t)(memsz*0.9)/quantum*quantum;
- if(mem == MAP_FAILED)
- {
- while(mem == MAP_FAILED && (memsz = memsz*10/11/quantum*quantum))
- mem = (char*)mmap(NULL, memsz, PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
- assert(mem != MAP_FAILED);
+ if (memsz != memsz0)
fprintf(stderr, "warning: only got %lu bytes of target mem (wanted %lu)\n",
(unsigned long)memsz, (unsigned long)memsz0);
- }
- mmu = new mmu_t(mem, memsz);
+ debug_mmu = new mmu_t(this, NULL);
- for(size_t i = 0; i < num_cores(); i++)
- procs[i] = new processor_t(this, new mmu_t(mem, memsz), i);
+ for (size_t i = 0; i < procs.size(); i++) {
+ procs[i] = new processor_t(isa, this, i);
+ procs[i]->set_halted(halted);
+ }
+
+ rtc.reset(new rtc_t(procs));
+ make_config_string();
}
sim_t::~sim_t()
{
- for(size_t i = 0; i < num_cores(); i++)
- {
- mmu_t* pmmu = &procs[i]->mmu;
+ for (size_t i = 0; i < procs.size(); i++)
delete procs[i];
- delete pmmu;
- }
- delete mmu;
- munmap(mem, memsz);
+ delete debug_mmu;
+ free(mem);
}
-void sim_t::send_ipi(reg_t who)
+int sim_t::run()
{
- if(who < num_cores())
- procs[who]->deliver_ipi();
+ if (!debug && log)
+ set_procs_debug(true);
+ while (htif->tick())
+ {
+ if (debug || ctrlc_pressed)
+ interactive();
+ else
+ step(INTERLEAVE);
+ if (gdbserver) {
+ gdbserver->handle();
+ }
+ }
+ return htif->exit_code();
}
-reg_t sim_t::get_scr(int which)
+void sim_t::step(size_t n)
{
- switch (which)
+ for (size_t i = 0, steps = 0; i < n; i += steps)
{
- case 0: return num_cores();
- case 1: return memsz >> 20;
- default: return -1;
+ steps = std::min(n - i, INTERLEAVE - current_step);
+ procs[current_proc]->step(steps);
+
+ current_step += steps;
+ if (current_step == INTERLEAVE)
+ {
+ current_step = 0;
+ procs[current_proc]->yield_load_reservation();
+ if (++current_proc == procs.size()) {
+ current_proc = 0;
+ rtc->increment(INTERLEAVE / INSNS_PER_RTC_TICK);
+ }
+
+ htif->tick();
+ }
}
}
-void sim_t::run(bool debug)
+bool sim_t::running()
{
- while (!htif->done())
- {
- if(!debug)
- step_all(10000, 1000, false);
- else
- interactive();
+ for (size_t i = 0; i < procs.size(); i++)
+ if (procs[i]->running())
+ return true;
+ return false;
+}
+
+void sim_t::set_debug(bool value)
+{
+ debug = value;
+}
+
+void sim_t::set_log(bool value)
+{
+ log = value;
+}
+
+void sim_t::set_histogram(bool value)
+{
+ histogram_enabled = value;
+ for (size_t i = 0; i < procs.size(); i++) {
+ procs[i]->set_histogram(histogram_enabled);
}
}
-void sim_t::step_all(size_t n, size_t interleave, bool noisy)
+void sim_t::set_procs_debug(bool value)
{
- htif->tick();
- for(size_t j = 0; j < n; j+=interleave)
- {
- for(int i = 0; i < (int)num_cores(); i++)
- procs[i]->step(interleave,noisy);
+ for (size_t i=0; i< procs.size(); i++)
+ procs[i]->set_debug(value);
+}
+
+bool sim_t::mmio_load(reg_t addr, size_t len, uint8_t* bytes)
+{
+ if (addr + len < addr)
+ return false;
+ return bus.load(addr, len, bytes);
+}
+
+bool sim_t::mmio_store(reg_t addr, size_t len, const uint8_t* bytes)
+{
+ if (addr + len < addr)
+ return false;
+ return bus.store(addr, len, bytes);
+}
+
+void sim_t::make_config_string()
+{
+ reg_t rtc_addr = EXT_IO_BASE;
+ bus.add_device(rtc_addr, rtc.get());
+
+ const int align = 0x1000;
+ reg_t cpu_addr = rtc_addr + ((rtc->size() - 1) / align + 1) * align;
+ reg_t cpu_size = align;
+
+ uint32_t reset_vec[8] = {
+ 0x297 + DRAM_BASE - DEFAULT_RSTVEC, // reset vector
+ 0x00028067, // jump straight to DRAM_BASE
+ 0x00000000, // reserved
+ 0, // config string pointer
+ 0, 0, 0, 0 // trap vector
+ };
+ reset_vec[3] = DEFAULT_RSTVEC + sizeof(reset_vec); // config string pointer
+
+ std::vector<char> rom((char*)reset_vec, (char*)reset_vec + sizeof(reset_vec));
+
+ std::stringstream s;
+ s << std::hex <<
+ "platform {\n"
+ " vendor ucb;\n"
+ " arch spike;\n"
+ "};\n"
+ "rtc {\n"
+ " addr 0x" << rtc_addr << ";\n"
+ "};\n"
+ "ram {\n"
+ " 0 {\n"
+ " addr 0x" << DRAM_BASE << ";\n"
+ " size 0x" << memsz << ";\n"
+ " };\n"
+ "};\n"
+ "core {\n";
+ for (size_t i = 0; i < procs.size(); i++) {
+ s <<
+ " " << i << " {\n"
+ " " << "0 {\n" << // hart 0 on core i
+ " isa " << procs[i]->isa_string << ";\n"
+ " timecmp 0x" << (rtc_addr + 8*(1+i)) << ";\n"
+ " ipi 0x" << cpu_addr << ";\n"
+ " };\n"
+ " };\n";
+ bus.add_device(cpu_addr, procs[i]);
+ cpu_addr += cpu_size;
}
+ s << "};\n";
+
+ config_string = s.str();
+ rom.insert(rom.end(), config_string.begin(), config_string.end());
+ rom.resize((rom.size() / align + 1) * align);
+
+ boot_rom.reset(new rom_device_t(rom));
+ bus.add_device(DEFAULT_RSTVEC, boot_rom.get());
}
projects / riscv-isa-sim.git / blobdiff