/*

* Copyright 2012 Luke Dashjr

* Copyright 2012 Con Kolivas

*

* This program is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License as published by the Free

* Software Foundation; either version 3 of the License, or (at your option)

* any later version. See COPYING for more details.

*/

#include <limits.h>

#include <pthread.h>

#include <stdint.h>

#include <stdio.h>

#include <strings.h>

#include <sys/time.h>

#include <unistd.h>

#include "config.h"

#ifdef WIN32

#include <windows.h>

#define dlsym (void*)GetProcAddress

#define dlclose FreeLibrary

typedef unsigned long FT_STATUS;

typedef PVOID FT_HANDLE;

__stdcall FT_STATUS (*FT_ListDevices)(PVOID pArg1, PVOID pArg2, DWORD Flags);

__stdcall FT_STATUS (*FT_Open)(int idx, FT_HANDLE*);

__stdcall FT_STATUS (*FT_GetComPortNumber)(FT_HANDLE, LPLONG lplComPortNumber);

__stdcall FT_STATUS (*FT_Close)(FT_HANDLE);

const uint32_t FT_OPEN_BY_DESCRIPTION = 2;

const uint32_t FT_LIST_ALL = 0x20000000;

const uint32_t FT_LIST_NUMBER_ONLY = 0x80000000;

enum {

FT_OK,

};

// Code must deal with a timeout. Make it 1 second on windows, 0.1 on linux.

#define BFopen(devpath) serial_open(devpath, 0, 10, true)

#else /* WIN32 */

#define BFopen(devpath) serial_open(devpath, 0, 1, true)

#endif /* WIN32 */

#include "compat.h"

#include "miner.h"

#include "fpgautils.h"

#define BITFORCE_SLEEP_MS 500

#define BITFORCE_TIMEOUT_S 7

#define BITFORCE_TIMEOUT_MS (BITFORCE_TIMEOUT_S * 1000)

#define BITFORCE_LONG_TIMEOUT_S 30

#define BITFORCE_LONG_TIMEOUT_MS (BITFORCE_LONG_TIMEOUT_S * 1000)

#define BITFORCE_CHECK_INTERVAL_MS 10

#define WORK_CHECK_INTERVAL_MS 50

#define MAX_START_DELAY_MS 100

#define tv_to_ms(tval) (tval.tv_sec * 1000 + tval.tv_usec / 1000)

#define TIME_AVG_CONSTANT 8

#define KNAME_WORK "full work"

#define KNAME_RANGE "nonce range"

struct device_api bitforce_api;

static void BFgets(char *buf, size_t bufLen, int fd)

{

do {

buf[0] = '\0';

--bufLen;

} while (likely(bufLen && read(fd, buf, 1) == 1 && (buf++)[0] != '\n'));

buf[0] = '\0';

}

static ssize_t BFwrite(int fd, const void *buf, ssize_t bufLen)

{

if ((bufLen) != write(fd, buf, bufLen))

return 0;

else

return bufLen;

}

#define BFclose(fd) close(fd)

static bool bitforce_detect_one(const char *devpath)

{

int fdDev = BFopen(devpath);

struct cgpu_info *bitforce;

char pdevbuf[0x100];

char *s;

applog(LOG_DEBUG, "BFL: Attempting to open %s", devpath);

if (unlikely(fdDev == -1)) {

applog(LOG_ERR, "BFL: Failed to open %s", devpath);

return false;

}

BFwrite(fdDev, "ZGX", 3);

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

if (unlikely(!pdevbuf[0])) {

applog(LOG_ERR, "BFL: Error reading/timeout (ZGX)");

return 0;

}

BFclose(fdDev);

if (unlikely(!strstr(pdevbuf, "SHA256"))) {

applog(LOG_ERR, "BFL: Didn't recognise BitForce on %s", devpath);

return false;

}

// We have a real BitForce!

bitforce = calloc(1, sizeof(*bitforce));

bitforce->api = &bitforce_api;

bitforce->device_path = strdup(devpath);

bitforce->deven = DEV_ENABLED;

bitforce->threads = 1;

/* Initially enable support for nonce range and disable it later if it

* fails */

if (opt_bfl_noncerange) {

bitforce->nonce_range = true;

bitforce->sleep_ms = BITFORCE_SLEEP_MS;

bitforce->kname = KNAME_RANGE;

} else {

bitforce->sleep_ms = BITFORCE_SLEEP_MS * 5;

bitforce->kname = KNAME_WORK;

}

if (likely((!memcmp(pdevbuf, ">>>ID: ", 7)) && (s = strstr(pdevbuf + 3, ">>>")))) {

s[0] = '\0';

bitforce->name = strdup(pdevbuf + 7);

}

mutex_init(&bitforce->device_mutex);

return add_cgpu(bitforce);

}

#define LOAD_SYM(sym) do { \

if (!(sym = dlsym(dll, #sym))) { \

applog(LOG_DEBUG, "Failed to load " #sym ", not using FTDI bitforce autodetect"); \

goto out; \

} \

} while(0)

#ifdef WIN32

static int bitforce_autodetect_ftdi(void)

{

char devpath[] = "\\\\.\\COMnnnnn";

char *devpathnum = &devpath[7];

char **bufptrs;

char *buf;

int found = 0;

DWORD i;

FT_STATUS ftStatus;

DWORD numDevs;

HMODULE dll = LoadLibrary("FTD2XX.DLL");

if (!dll) {

applog(LOG_DEBUG, "FTD2XX.DLL failed to load, not using FTDI bitforce autodetect");

return 0;

}

LOAD_SYM(FT_ListDevices);

LOAD_SYM(FT_Open);

LOAD_SYM(FT_GetComPortNumber);

LOAD_SYM(FT_Close);

ftStatus = FT_ListDevices(&numDevs, NULL, FT_LIST_NUMBER_ONLY);

if (ftStatus != FT_OK) {

applog(LOG_DEBUG, "FTDI device count failed, not using FTDI bitforce autodetect");

goto out;

}

applog(LOG_DEBUG, "FTDI reports %u devices", (unsigned)numDevs);

buf = alloca(65 * numDevs);

bufptrs = alloca(sizeof(*bufptrs) * (numDevs + 1));

for (i = 0; i < numDevs; ++i)

bufptrs[i] = &buf[i * 65];

bufptrs[numDevs] = NULL;

ftStatus = FT_ListDevices(bufptrs, &numDevs, FT_LIST_ALL | FT_OPEN_BY_DESCRIPTION);

if (ftStatus != FT_OK) {

applog(LOG_DEBUG, "FTDI device list failed, not using FTDI bitforce autodetect");

goto out;

}

for (i = numDevs; i > 0; ) {

--i;

bufptrs[i][64] = '\0';

if (!(strstr(bufptrs[i], "BitFORCE") && strstr(bufptrs[i], "SHA256")))

continue;

FT_HANDLE ftHandle;

if (FT_OK != FT_Open(i, &ftHandle))

continue;

LONG lComPortNumber;

ftStatus = FT_GetComPortNumber(ftHandle, &lComPortNumber);

FT_Close(ftHandle);

if (FT_OK != ftStatus || lComPortNumber < 0)

continue;

sprintf(devpathnum, "%d", (int)lComPortNumber);

if (bitforce_detect_one(devpath))

++found;

}

out:

dlclose(dll);

return found;

}

#else

static int bitforce_autodetect_ftdi(void)

{

return 0;

}

#endif

static int bitforce_detect_auto(void)

{

return (serial_autodetect_udev (bitforce_detect_one, "BitFORCE*SHA256") ?:

serial_autodetect_devserial(bitforce_detect_one, "BitFORCE_SHA256") ?:

bitforce_autodetect_ftdi() ?:

0);

}

static void bitforce_detect(void)

{

serial_detect_auto(&bitforce_api, bitforce_detect_one, bitforce_detect_auto);

}

static void get_bitforce_statline_before(char *buf, struct cgpu_info *bitforce)

{

float gt = bitforce->temp;

if (gt > 0)

tailsprintf(buf, "%5.1fC ", gt);

else

tailsprintf(buf, " ", gt);

tailsprintf(buf, " | ");

}

static bool bitforce_thread_prepare(struct thr_info *thr)

{

struct cgpu_info *bitforce = thr->cgpu;

int fdDev = BFopen(bitforce->device_path);

struct timeval now;

if (unlikely(fdDev == -1)) {

applog(LOG_ERR, "BFL%i: Failed to open %s", bitforce->device_id, bitforce->device_path);

return false;

}

bitforce->device_fd = fdDev;

applog(LOG_INFO, "BFL%i: Opened %s", bitforce->device_id, bitforce->device_path);

gettimeofday(&now, NULL);

get_datestamp(bitforce->init, &now);

return true;

}

static void bitforce_clear_buffer(struct cgpu_info *bitforce)

{

int fdDev = bitforce->device_fd;

char pdevbuf[0x100];

int count = 0;

if (!fdDev)

return;

applog(LOG_DEBUG, "BFL%i: Clearing read buffer", bitforce->device_id);

mutex_lock(&bitforce->device_mutex);

do {

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

} while (pdevbuf[0] && (++count < 10));

mutex_unlock(&bitforce->device_mutex);

}

void bitforce_init(struct cgpu_info *bitforce)

{

char *devpath = bitforce->device_path;

int fdDev = bitforce->device_fd, retries = 0;

char pdevbuf[0x100];

char *s;

applog(LOG_WARNING, "BFL%i: Re-initialising", bitforce->device_id);

bitforce_clear_buffer(bitforce);

mutex_lock(&bitforce->device_mutex);

if (fdDev) {

BFclose(fdDev);

sleep(5);

}

bitforce->device_fd = 0;

fdDev = BFopen(devpath);

if (unlikely(fdDev == -1)) {

mutex_unlock(&bitforce->device_mutex);

applog(LOG_ERR, "BFL%i: Failed to open %s", bitforce->device_id, devpath);

return;

}

do {

BFwrite(fdDev, "ZGX", 3);

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

if (unlikely(!pdevbuf[0])) {

mutex_unlock(&bitforce->device_mutex);

applog(LOG_ERR, "BFL%i: Error reading/timeout (ZGX)", bitforce->device_id);

return;

}

if (retries++)

nmsleep(10);

} while (!strstr(pdevbuf, "BUSY") && (retries * 10 < BITFORCE_TIMEOUT_MS));

if (unlikely(!strstr(pdevbuf, "SHA256"))) {

mutex_unlock(&bitforce->device_mutex);

applog(LOG_ERR, "BFL%i: Didn't recognise BitForce on %s returned: %s", bitforce->device_id, devpath, pdevbuf);

return;

}

if (likely((!memcmp(pdevbuf, ">>>ID: ", 7)) && (s = strstr(pdevbuf + 3, ">>>")))) {

s[0] = '\0';

bitforce->name = strdup(pdevbuf + 7);

}

bitforce->device_fd = fdDev;

bitforce->sleep_ms = BITFORCE_SLEEP_MS;

mutex_unlock(&bitforce->device_mutex);

}

static void bitforce_flash_led(struct cgpu_info *bitforce)

{

int fdDev = bitforce->device_fd;

if (!fdDev)

return;

/* Do not try to flash the led if we're polling for a result to

* minimise the chance of interleaved results */

if (bitforce->polling)

return;

/* It is not critical flashing the led so don't get stuck if we

* can't grab the mutex here */

if (mutex_trylock(&bitforce->device_mutex))

return;

BFwrite(fdDev, "ZMX", 3);

/* Once we've tried - don't do it until told to again */

bitforce->flash_led = false;

/* However, this stops anything else getting a reply

* So best to delay any other access to the BFL */

sleep(4);

mutex_unlock(&bitforce->device_mutex);

return; // nothing is returned by the BFL

}

static bool bitforce_get_temp(struct cgpu_info *bitforce)

{

int fdDev = bitforce->device_fd;

char pdevbuf[0x100];

char *s;

if (!fdDev)

return false;

/* Do not try to get the temperature if we're polling for a result to

* minimise the chance of interleaved results */

if (bitforce->polling)

return true;

// Flash instead of Temp - doing both can be too slow

if (bitforce->flash_led) {

bitforce_flash_led(bitforce);

return true;

}

/* It is not critical getting temperature so don't get stuck if we

* can't grab the mutex here */

if (mutex_trylock(&bitforce->device_mutex))

return false;

BFwrite(fdDev, "ZLX", 3);

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

mutex_unlock(&bitforce->device_mutex);

if (unlikely(!pdevbuf[0])) {

applog(LOG_ERR, "BFL%i: Error: Get temp returned empty string/timed out", bitforce->device_id);

bitforce->hw_errors++;

return false;

}

if ((!strncasecmp(pdevbuf, "TEMP", 4)) && (s = strchr(pdevbuf + 4, ':'))) {

float temp = strtof(s + 1, NULL);

/* Cope with older software that breaks and reads nonsense

* values */

if (temp > 100)

temp = strtod(s + 1, NULL);

if (temp > 0) {

bitforce->temp = temp;

if (unlikely(bitforce->cutofftemp > 0 && temp > bitforce->cutofftemp)) {

applog(LOG_WARNING, "BFL%i: Hit thermal cutoff limit, disabling!", bitforce->device_id);

bitforce->deven = DEV_RECOVER;

dev_error(bitforce, REASON_DEV_THERMAL_CUTOFF);

}

}

} else {

/* Use the temperature monitor as a kind of watchdog for when

* our responses are out of sync and flush the buffer to

* hopefully recover */

applog(LOG_WARNING, "BFL%i: Garbled response probably throttling, clearing buffer", bitforce->device_id);

dev_error(bitforce, REASON_DEV_THROTTLE);

/* Count throttling episodes as hardware errors */

bitforce->hw_errors++;

bitforce_clear_buffer(bitforce);

return false;

}

return true;

}

static bool bitforce_send_work(struct thr_info *thr, struct work *work)

{

struct cgpu_info *bitforce = thr->cgpu;

int fdDev = bitforce->device_fd;

unsigned char ob[70];

char pdevbuf[0x100];

char *s;

if (!fdDev)

return false;

re_send:

mutex_lock(&bitforce->device_mutex);

if (bitforce->nonce_range)

BFwrite(fdDev, "ZPX", 3);

else

BFwrite(fdDev, "ZDX", 3);

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

if (!pdevbuf[0] || !strncasecmp(pdevbuf, "B", 1)) {

mutex_unlock(&bitforce->device_mutex);

nmsleep(WORK_CHECK_INTERVAL_MS);

goto re_send;

} else if (unlikely(strncasecmp(pdevbuf, "OK", 2))) {

mutex_unlock(&bitforce->device_mutex);

if (bitforce->nonce_range) {

applog(LOG_WARNING, "BFL%i: Does not support nonce range, disabling", bitforce->device_id);

bitforce->nonce_range = false;

bitforce->sleep_ms *= 5;

bitforce->kname = KNAME_WORK;

goto re_send;

}

applog(LOG_ERR, "BFL%i: Error: Send work reports: %s", bitforce->device_id, pdevbuf);

return false;

}

sprintf((char *)ob, ">>>>>>>>");

memcpy(ob + 8, work->midstate, 32);

memcpy(ob + 8 + 32, work->data + 64, 12);

if (!bitforce->nonce_range) {

sprintf((char *)ob + 8 + 32 + 12, ">>>>>>>>");

work->blk.nonce = bitforce->nonces = 0xffffffff;

BFwrite(fdDev, ob, 60);

} else {

uint32_t *nonce;

nonce = (uint32_t *)(ob + 8 + 32 + 12);

*nonce = htobe32(work->blk.nonce);

nonce = (uint32_t *)(ob + 8 + 32 + 12 + 4);

/* Split work up into 1/5th nonce ranges */

bitforce->nonces = 0x33333332;

*nonce = htobe32(work->blk.nonce + bitforce->nonces);

work->blk.nonce += bitforce->nonces + 1;

sprintf((char *)ob + 8 + 32 + 12 + 8, ">>>>>>>>");

BFwrite(fdDev, ob, 68);

}

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

mutex_unlock(&bitforce->device_mutex);

if (opt_debug) {

s = bin2hex(ob + 8, 44);

applog(LOG_DEBUG, "BFL%i: block data: %s", bitforce->device_id, s);

free(s);

}

if (unlikely(!pdevbuf[0])) {

applog(LOG_ERR, "BFL%i: Error: Send block data returned empty string/timed out", bitforce->device_id);

return false;

}

if (unlikely(strncasecmp(pdevbuf, "OK", 2))) {

applog(LOG_ERR, "BFL%i: Error: Send block data reports: %s", bitforce->device_id, pdevbuf);

return false;

}

gettimeofday(&bitforce->work_start_tv, NULL);

return true;

}

static int64_t bitforce_get_result(struct thr_info *thr, struct work *work)

{

struct cgpu_info *bitforce = thr->cgpu;

int fdDev = bitforce->device_fd;

unsigned int delay_time_ms;

struct timeval elapsed;

struct timeval now;

char pdevbuf[0x100];

char *pnoncebuf;

uint32_t nonce;

if (!fdDev)

return -1;

while (1) {

if (unlikely(thr->work_restart))

return 0;

mutex_lock(&bitforce->device_mutex);

BFwrite(fdDev, "ZFX", 3);

pdevbuf[0] = '\0';

BFgets(pdevbuf, sizeof(pdevbuf), fdDev);

mutex_unlock(&bitforce->device_mutex);

gettimeofday(&now, NULL);

timersub(&now, &bitforce->work_start_tv, &elapsed);

if (elapsed.tv_sec >= BITFORCE_LONG_TIMEOUT_S) {

applog(LOG_ERR, "BFL%i: took %dms - longer than %dms", bitforce->device_id,

tv_to_ms(elapsed), BITFORCE_LONG_TIMEOUT_MS);

return 0;

}

if (pdevbuf[0] && strncasecmp(pdevbuf, "B", 1)) /* BFL does not respond during throttling */

break;

/* if BFL is throttling, no point checking so quickly */

delay_time_ms = (pdevbuf[0] ? BITFORCE_CHECK_INTERVAL_MS : 2 * WORK_CHECK_INTERVAL_MS);

nmsleep(delay_time_ms);

bitforce->wait_ms += delay_time_ms;

}

if (elapsed.tv_sec > BITFORCE_TIMEOUT_S) {

applog(LOG_ERR, "BFL%i: took %dms - longer than %dms", bitforce->device_id,

tv_to_ms(elapsed), BITFORCE_TIMEOUT_MS);

dev_error(bitforce, REASON_DEV_OVER_HEAT);

if (!pdevbuf[0]) /* Only return if we got nothing after timeout - there still may be results */

return 0;

} else if (!strncasecmp(pdevbuf, "N", 1)) {/* Hashing complete (NONCE-FOUND or NO-NONCE) */

/* Simple timing adjustment. Allow a few polls to cope with

* OS timer delays being variably reliable. wait_ms will

* always equal sleep_ms when we've waited greater than or

* equal to the result return time.*/

delay_time_ms = bitforce->sleep_ms;

if (bitforce->wait_ms > bitforce->sleep_ms + (WORK_CHECK_INTERVAL_MS * 2))

bitforce->sleep_ms += (bitforce->wait_ms - bitforce->sleep_ms) / 2;

else if (bitforce->wait_ms == bitforce->sleep_ms) {

if (bitforce->sleep_ms > WORK_CHECK_INTERVAL_MS)

bitforce->sleep_ms -= WORK_CHECK_INTERVAL_MS;

else if (bitforce->sleep_ms > BITFORCE_CHECK_INTERVAL_MS)

bitforce->sleep_ms -= BITFORCE_CHECK_INTERVAL_MS;

}

if (delay_time_ms != bitforce->sleep_ms)

applog(LOG_DEBUG, "BFL%i: Wait time changed to: %d, waited %u", bitforce->device_id, bitforce->sleep_ms, bitforce->wait_ms);

/* Work out the average time taken. Float for calculation, uint for display */

bitforce->avg_wait_f += (tv_to_ms(elapsed) - bitforce->avg_wait_f) / TIME_AVG_CONSTANT;

bitforce->avg_wait_d = (unsigned int) (bitforce->avg_wait_f + 0.5);

}

applog(LOG_DEBUG, "BFL%i: waited %dms until %s", bitforce->device_id, bitforce->wait_ms, pdevbuf);

if (!strncasecmp(&pdevbuf[2], "-", 1))

return bitforce->nonces; /* No valid nonce found */

else if (!strncasecmp(pdevbuf, "I", 1))

return 0; /* Device idle */

else if (strncasecmp(pdevbuf, "NONCE-FOUND", 11)) {

bitforce->hw_errors++;

applog(LOG_WARNING, "BFL%i: Error: Get result reports: %s", bitforce->device_id, pdevbuf);

bitforce_clear_buffer(bitforce);

return 0;

}

pnoncebuf = &pdevbuf[12];

while (1) {

hex2bin((void*)&nonce, pnoncebuf, 4);

#ifndef __BIG_ENDIAN__

nonce = swab32(nonce);

#endif

if (unlikely(bitforce->nonce_range && (nonce >= work->blk.nonce ||

(work->blk.nonce > 0 && nonce < work->blk.nonce - bitforce->nonces - 1)))) {

applog(LOG_WARNING, "BFL%i: Disabling broken nonce range support", bitforce->device_id);

bitforce->nonce_range = false;

work->blk.nonce = 0xffffffff;

bitforce->sleep_ms *= 5;

bitforce->kname = KNAME_WORK;

}

submit_nonce(thr, work, nonce);

if (strncmp(&pnoncebuf[8], ",", 1))

break;

pnoncebuf += 9;

}

return bitforce->nonces;

}

static void bitforce_shutdown(struct thr_info *thr)

{

struct cgpu_info *bitforce = thr->cgpu;

BFclose(bitforce->device_fd);

bitforce->device_fd = 0;

}

static void biforce_thread_enable(struct thr_info *thr)

{

struct cgpu_info *bitforce = thr->cgpu;

bitforce_init(bitforce);

}

static int64_t bitforce_scanhash(struct thr_info *thr, struct work *work, int64_t __maybe_unused max_nonce)

{

struct cgpu_info *bitforce = thr->cgpu;

bool send_ret;

int64_t ret;

send_ret = bitforce_send_work(thr, work);

if (!restart_wait(bitforce->sleep_ms))

return 0;

bitforce->wait_ms = bitforce->sleep_ms;

if (send_ret) {

bitforce->polling = true;

ret = bitforce_get_result(thr, work);

bitforce->polling = false;

} else

ret = -1;

if (ret == -1) {

ret = 0;

applog(LOG_ERR, "BFL%i: Comms error", bitforce->device_id);

dev_error(bitforce, REASON_DEV_COMMS_ERROR);

bitforce->hw_errors++;

/* empty read buffer */

bitforce_clear_buffer(bitforce);

}

return ret;

}

static bool bitforce_get_stats(struct cgpu_info *bitforce)

{

return bitforce_get_temp(bitforce);

}

static void bitforce_identify(struct cgpu_info *bitforce)

{

bitforce->flash_led = true;

}

static bool bitforce_thread_init(struct thr_info *thr)

{

struct cgpu_info *bitforce = thr->cgpu;

unsigned int wait;

/* Pause each new thread at least 100ms between initialising

* so the devices aren't making calls all at the same time. */

wait = thr->id * MAX_START_DELAY_MS;

applog(LOG_DEBUG, "BFL%i: Delaying start by %dms", bitforce->device_id, wait / 1000);

nmsleep(wait);

return true;

}

static struct api_data *bitforce_api_stats(struct cgpu_info *cgpu)

{

struct api_data *root = NULL;

// Warning, access to these is not locked - but we don't really

// care since hashing performance is way more important than

// locking access to displaying API debug 'stats'

// If locking becomes an issue for any of them, use copy_data=true also

root = api_add_uint(root, "Sleep Time", &(cgpu->sleep_ms), false);

root = api_add_uint(root, "Avg Wait", &(cgpu->avg_wait_d), false);

return root;

}

struct device_api bitforce_api = {

.dname = "bitforce",

.name = "BFL",

.api_detect = bitforce_detect,

.get_api_stats = bitforce_api_stats,

.reinit_device = bitforce_init,

.get_statline_before = get_bitforce_statline_before,

.get_stats = bitforce_get_stats,

.identify_device = bitforce_identify,

.thread_prepare = bitforce_thread_prepare,

.thread_init = bitforce_thread_init,

.scanhash = bitforce_scanhash,

.thread_shutdown = bitforce_shutdown,

.thread_enable = biforce_thread_enable

};