uint64_t geopm_crc32_str(uint64_t begin, const char *key)
{
uint64_t result = begin;
const uint64_t *ptr = (const uint64_t *)key;
size_t num_word = strlen(key) / 8;
for (size_t i = 0; i < num_word; ++i) {
result = geopm_crc32_u64(result, ptr[i]);
}
size_t extra = strlen(key) - 8 * num_word;
if (extra) {
uint64_t last_word = 0;
for (size_t i = 0; i < extra; ++i) {
((char *)(&last_word))[i] = ((char *)(ptr + num_word))[i];
}
result = geopm_crc32_u64(result, last_word);
}
return result;
}
size_t ProfileTable::hash(uint64_t key) const
{
size_t result = 0;
if (geopm_region_id_is_mpi(key)) {
result = m_mask + 1;
}
else if (geopm_region_id_is_epoch(key)) {
result = m_mask + 2;
}
else {
result = geopm_crc32_u64(0, key) & m_mask;
}
return result;
}
int main(int argc, char **argv)
{
int err = 0;
char error_msg[512];
if (argc == 2 &&
strncmp(argv[1], "crc32", strlen("crc32") + 1) == 0) {
uint64_t result = geopm_crc32_u64(0xDEADBEEF, 0xBADFEE);
if (result == 0xA347ADE3 ) {
std::cout << "Platform supports crc32 intrinsic." << std::endl;
}
else {
err = GEOPM_ERROR_PLATFORM_UNSUPPORTED;
std::cerr << "Warning: <geopm_platform_supported>: Platform does not support crc32 intrinsic." << std::endl;
}
}
else {
int cpu_id = geopm_read_cpuid();
if (cpu_id != 0x63F &&
cpu_id != 0x63F &&
cpu_id != 0x63E &&
cpu_id != 0x62D &&
cpu_id != 0x64F &&
cpu_id != 0x657) {
err = GEOPM_ERROR_PLATFORM_UNSUPPORTED;
geopm_error_message(err, error_msg, 512);
std::cerr << "Warning: <geopm_platform_supported>: Platform 0x" << std::hex << cpu_id << " is not a supported CPU" << " " << error_msg << "." << std::endl;
}
if (!err) {
int fd = open("/dev/cpu/0/msr_safe", O_RDONLY);
if (fd == -1) {
err = GEOPM_ERROR_MSR_OPEN;
geopm_error_message(err, error_msg, 512);
std::cerr << "Warning: <geopm_platform_supported>: Not able to open msr_safe device. " << error_msg << "." << std::endl;
}
else {
close(fd);
}
}
if (!err) {
std::cout << "Platform 0x" << std::hex << cpu_id << " is supported by geopm and msr_safe is available." << std::endl;
}
}
return err;
}