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#include <stddef.h>
#include <sm3_mb.h>
#include <assert.h>

#ifndef max
#define max(a,b)            (((a) > (b)) ? (a) : (b))
#endif

#ifndef min
#define min(a,b)            (((a) < (b)) ? (a) : (b))
#endif

#define SM3_MB_CE_MAX_LANES	4
void sm3_mb_asimd_x4(SM3_JOB *, SM3_JOB *, SM3_JOB *, SM3_JOB *, int);
void sm3_mb_asimd_x1(SM3_JOB *, int);

#define LANE_IS_NOT_FINISHED(state,i)  	\
	(((state->lens[i]&(~0xf))!=0) && state->ldata[i].job_in_lane!=NULL)
#define LANE_IS_FINISHED(state,i)  	\
	(((state->lens[i]&(~0xf))==0) && state->ldata[i].job_in_lane!=NULL)
#define	LANE_IS_FREE(state,i)		\
	(((state->lens[i]&(~0xf))==0) && state->ldata[i].job_in_lane==NULL)
#define LANE_IS_INVALID(state,i)	\
	(((state->lens[i]&(~0xf))!=0) && state->ldata[i].job_in_lane==NULL)
void sm3_mb_mgr_init_asimd(SM3_MB_JOB_MGR * state)
{
	unsigned int i;

	state->unused_lanes = 0xf;
	state->num_lanes_inuse = 0;
	for (i = 0; i < SM3_MB_CE_MAX_LANES; i++) {
		state->unused_lanes <<= 4;
		state->unused_lanes |= SM3_MB_CE_MAX_LANES - 1 - i;
		state->lens[i] = i;
		state->ldata[i].job_in_lane = 0;
	}

	//lanes > SM3_MB_CE_MAX_LANES is invalid lane
	for (; i < SM3_MAX_LANES; i++) {
		state->lens[i] = 0xf;
		state->ldata[i].job_in_lane = 0;
	}
}

static int sm3_mb_mgr_do_jobs(SM3_MB_JOB_MGR * state)
{
	int lane_idx, len, i;

	if (state->num_lanes_inuse == 0) {
		return -1;
	}
	if (state->num_lanes_inuse == 4) {
		len = min(min(state->lens[0], state->lens[1]),
			  min(state->lens[2], state->lens[3]));
		lane_idx = len & 0xf;
		len &= ~0xf;
		sm3_mb_asimd_x4(state->ldata[0].job_in_lane,
				state->ldata[1].job_in_lane,
				state->ldata[2].job_in_lane,
				state->ldata[3].job_in_lane, len >> 4);
		//only return the min length job
		for (i = 0; i < SM3_MAX_LANES; i++) {
			if (LANE_IS_NOT_FINISHED(state, i)) {
				state->lens[i] -= len;
				state->ldata[i].job_in_lane->len -= len;
				state->ldata[i].job_in_lane->buffer += len << 2;
			}
		}

		return lane_idx;
	} else {
		for (i = 0; i < SM3_MAX_LANES; i++) {
			if (LANE_IS_NOT_FINISHED(state, i)) {
				len = state->lens[i] & (~0xf);
				sm3_mb_asimd_x1(state->ldata[i].job_in_lane, len >> 4);
				state->lens[i] -= len;
				state->ldata[i].job_in_lane->len -= len;
				state->ldata[i].job_in_lane->buffer += len << 2;
				return i;
			}
		}
	}
	return -1;

}

static SM3_JOB *sm3_mb_mgr_free_lane(SM3_MB_JOB_MGR * state)
{
	int i;
	SM3_JOB *ret = NULL;

	for (i = 0; i < SM3_MB_CE_MAX_LANES; i++) {
		if (LANE_IS_FINISHED(state, i)) {

			state->unused_lanes <<= 4;
			state->unused_lanes |= i;
			state->num_lanes_inuse--;
			ret = state->ldata[i].job_in_lane;
			ret->status = STS_COMPLETED;
			state->ldata[i].job_in_lane = NULL;
			break;
		}
	}
	return ret;
}

static void sm3_mb_mgr_insert_job(SM3_MB_JOB_MGR * state, SM3_JOB * job)
{
	int lane_idx;
	//add job into lanes
	lane_idx = state->unused_lanes & 0xf;
	//fatal error
	assert(lane_idx < SM3_MB_CE_MAX_LANES);
	state->lens[lane_idx] = (job->len << 4) | lane_idx;
	state->ldata[lane_idx].job_in_lane = job;
	state->unused_lanes >>= 4;
	state->num_lanes_inuse++;
}

SM3_JOB *sm3_mb_mgr_submit_asimd(SM3_MB_JOB_MGR * state, SM3_JOB * job)
{
#ifndef NDEBUG
	int lane_idx;
#endif
	SM3_JOB *ret;

	//add job into lanes
	sm3_mb_mgr_insert_job(state, job);

	ret = sm3_mb_mgr_free_lane(state);
	if (ret != NULL) {
		return ret;
	}
	//submit will wait all lane has data
	if (state->num_lanes_inuse < SM3_MB_CE_MAX_LANES)
		return NULL;
#ifndef NDEBUG
	lane_idx = sm3_mb_mgr_do_jobs(state);
	assert(lane_idx != -1);
#else
	sm3_mb_mgr_do_jobs(state);
#endif

	//~ i = lane_idx;
	ret = sm3_mb_mgr_free_lane(state);
	return ret;
}

SM3_JOB *sm3_mb_mgr_flush_asimd(SM3_MB_JOB_MGR * state)
{
	SM3_JOB *ret;
	ret = sm3_mb_mgr_free_lane(state);
	if (ret) {
		return ret;
	}

	sm3_mb_mgr_do_jobs(state);
	return sm3_mb_mgr_free_lane(state);

}
