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#include <sys/time.h>
#include "devices.h"
#include "processor.h"
clint_t::clint_t(std::vector<processor_t*>& procs, uint64_t freq_hz, bool real_time)
: procs(procs), freq_hz(freq_hz), real_time(real_time), mtime(0), mtimecmp(procs.size())
{
struct timeval base;
gettimeofday(&base, NULL);
real_time_ref_secs = base.tv_sec;
real_time_ref_usecs = base.tv_usec;
}
/* 0000 msip hart 0
* 0004 msip hart 1
* 4000 mtimecmp hart 0 lo
* 4004 mtimecmp hart 0 hi
* 4008 mtimecmp hart 1 lo
* 400c mtimecmp hart 1 hi
* bff8 mtime lo
* bffc mtime hi
*/
#define MSIP_BASE 0x0
#define MTIMECMP_BASE 0x4000
#define MTIME_BASE 0xbff8
bool clint_t::load(reg_t addr, size_t len, uint8_t* bytes)
{
increment(0);
if (addr >= MSIP_BASE && addr + len <= MSIP_BASE + procs.size()*sizeof(msip_t)) {
std::vector<msip_t> msip(procs.size());
for (size_t i = 0; i < procs.size(); ++i)
msip[i] = !!(procs[i]->state.mip->read() & MIP_MSIP);
memcpy(bytes, (uint8_t*)&msip[0] + addr - MSIP_BASE, len);
} else if (addr >= MTIMECMP_BASE && addr + len <= MTIMECMP_BASE + procs.size()*sizeof(mtimecmp_t)) {
memcpy(bytes, (uint8_t*)&mtimecmp[0] + addr - MTIMECMP_BASE, len);
} else if (addr >= MTIME_BASE && addr + len <= MTIME_BASE + sizeof(mtime_t)) {
memcpy(bytes, (uint8_t*)&mtime + addr - MTIME_BASE, len);
} else {
return false;
}
return true;
}
bool clint_t::store(reg_t addr, size_t len, const uint8_t* bytes)
{
if (addr >= MSIP_BASE && addr + len <= MSIP_BASE + procs.size()*sizeof(msip_t)) {
std::vector<msip_t> msip(procs.size());
std::vector<msip_t> mask(procs.size(), 0);
memcpy((uint8_t*)&msip[0] + addr - MSIP_BASE, bytes, len);
memset((uint8_t*)&mask[0] + addr - MSIP_BASE, 0xff, len);
for (size_t i = 0; i < procs.size(); ++i) {
if (!(mask[i] & 0xFF)) continue;
procs[i]->state.mip->backdoor_write_with_mask(MIP_MSIP, 0);
if (!!(msip[i] & 1))
procs[i]->state.mip->backdoor_write_with_mask(MIP_MSIP, MIP_MSIP);
}
} else if (addr >= MTIMECMP_BASE && addr + len <= MTIMECMP_BASE + procs.size()*sizeof(mtimecmp_t)) {
memcpy((uint8_t*)&mtimecmp[0] + addr - MTIMECMP_BASE, bytes, len);
} else if (addr >= MTIME_BASE && addr + len <= MTIME_BASE + sizeof(mtime_t)) {
memcpy((uint8_t*)&mtime + addr - MTIME_BASE, bytes, len);
} else {
return false;
}
increment(0);
return true;
}
void clint_t::increment(reg_t inc)
{
if (real_time) {
struct timeval now;
uint64_t diff_usecs;
gettimeofday(&now, NULL);
diff_usecs = ((now.tv_sec - real_time_ref_secs) * 1000000) + (now.tv_usec - real_time_ref_usecs);
mtime = diff_usecs * freq_hz / 1000000;
} else {
mtime += inc;
}
for (size_t i = 0; i < procs.size(); i++) {
procs[i]->state.mip->backdoor_write_with_mask(MIP_MTIP, 0);
if (mtime >= mtimecmp[i])
procs[i]->state.mip->backdoor_write_with_mask(MIP_MTIP, MIP_MTIP);
}
}
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