void acquire_lock(LOCK_T * lock){
/* Write Entering true */
/* Write Number */
unsigned remote = lock->remote_cpuid;
unsigned id = get_cpuid();
lock->local_entering = 1;
noc_write(remote,
(void _SPM *)&(lock->remote_ptr->remote_entering),
(void _SPM *)&lock->local_entering,
sizeof(lock->local_entering),
0);
//#pragma loopbound min 1 max 2
#pragma loopbound min PKT_TRANS_WAIT max PKT_TRANS_WAIT
while(!noc_dma_done(remote));
unsigned n = (unsigned)lock->remote_number + 1;
lock->local_number = n;
/* Enforce memory barrier */
noc_write(remote,
(void _SPM *)&(lock->remote_ptr->remote_number),
(void _SPM *)&lock->local_number,
sizeof(lock->local_number),
0);
// /* Enforce memory barrier */
#pragma loopbound min PKT_TRANS_WAIT max PKT_TRANS_WAIT
while(!noc_dma_done(remote)); // noc_write() also waits for the dma to be
// free, so no need to do it here as well
/* Write Entering false */
lock->local_entering = 0;
noc_write(remote,
(void _SPM *)&(lock->remote_ptr->remote_entering),
(void _SPM *)&lock->local_entering,
sizeof(lock->local_entering),
0);
/* Wait for remote core not to change number */
#pragma loopbound min 1 max 2
while(lock->remote_entering == 1);
/* Wait to be the first in line to the bakery queue */
unsigned m = lock->remote_number;
#pragma loopbound min 1 max 2
while( (m != 0) &&
( (m < n) || ((m == n) && ( remote < id)))) {
m = lock->remote_number;
}
/* Lock is grabbed */
return;
}
void noc_test_slave() {
// Performing libnoc test...
noc_receive();
// for (int i = 0; i < 8; ++i) {
// *(NOC_SPM_BASE+i) = 0x11223344 * i;
// }
noc_write((unsigned)NOC_MASTER,(volatile void _SPM *)(NOC_SPM_BASE+(get_cpuid()*8)),(volatile void _SPM *)NOC_SPM_BASE,32,1);
while(done[NOC_MASTER] != 1){;}
return;
}
void release_lock(LOCK_T * lock) {
/* Write Number */
lock->local_number = 0;
noc_write(lock->remote_cpuid,
(void _SPM *)&(lock->remote_ptr->remote_number),
(void _SPM *)&lock->local_number,
sizeof(lock->local_number),
0);
/* Enforce memory barrier */
#pragma loopbound min PKT_TRANS_WAIT max PKT_TRANS_WAIT
while(!noc_dma_done(lock->remote_cpuid));
/* Lock is freed */
return;
}
void noc_test_master() {
printf("Performing libnoc test...");
fflush(stdout);
for (int i = 0; i < get_cpucnt(); ++i) {
if (i != NOC_MASTER) {
for (int j = 0; j < 8; ++j) {
*(NOC_SPM_BASE+j) = 0x11223344 * i;
}
noc_write((unsigned)i,(volatile void _SPM *)NOC_SPM_BASE,(volatile void _SPM *)NOC_SPM_BASE,32,1);
while(done[i] != 1){;}
noc_receive();
for (int j = 0; j < 8; ++j){
ABORT_IF_FAIL(*(NOC_SPM_BASE+(i*8)+j) != 0x11223344 * i ,"Wrong data received");
}
}
}
printf("OK\n");
}
static void slave(void* param) {
// clear communication areas
// cannot use memset() for _SPM pointers!
for(int i = 0; i < sizeof(struct msg_t); i++) {
((volatile _SPM char *)spm_in)[i] = 0;
((volatile _SPM char *)spm_out)[i] = 0;
}
// wait and poll until message arrives
while(!spm_in->ready) {
/* spin */
}
// PROCESS: add ID to sum_id
spm_out->sum = spm_in->sum + get_cpuid();
spm_out->ready = 1;
// send to next slave
int rcv_id = (get_cpuid()==(get_cpucnt()-1)) ? 0 : get_cpuid()+1;
noc_write(rcv_id, spm_in, spm_out, sizeof(struct msg_t), 0);
return;
}
static void master(void) {
// reset sum
spm_out->sum = 0;
// the message is ready
spm_out->ready = 1;
// The first message must be delayed until all slaves have cleared
// their SPM! Writing something does the trick.
WRITE("INIT\n", 5);
// send message to core 1
noc_write(get_cpuid()+1, spm_in, spm_out, sizeof(struct msg_t), 0);
WRITE("SENT\n", 5);
// wait and poll
while(!spm_in->ready) {
/* spin */
}
WRITE("RCVD ", 5);
static char msg[10];
msg[0] = XDIGIT((spm_in->sum >> 28) & 0xf);
msg[1] = XDIGIT((spm_in->sum >> 24) & 0xf);
msg[2] = XDIGIT((spm_in->sum >> 20) & 0xf);
msg[3] = XDIGIT((spm_in->sum >> 16) & 0xf);
msg[4] = XDIGIT((spm_in->sum >> 12) & 0xf);
msg[5] = XDIGIT((spm_in->sum >> 8) & 0xf);
msg[6] = XDIGIT((spm_in->sum >> 4) & 0xf);
msg[7] = XDIGIT((spm_in->sum >> 0) & 0xf);
msg[8] = '\n';
WRITE(msg, 9);
return;
}