static int sff_8431_open(struct nfp_phymod *phy)
{
struct nfp_phymod_priv *priv = phy->priv;
struct sff_8431 *sff;
int err;
sff = kzalloc(sizeof(*sff), GFP_KERNEL);
if (!sff)
return -ENOMEM;
sff->selected = 0;
err = _phymod_get_attr_pin(phy, "pin.present", &sff->in.present);
if (err < 0)
goto exit;
err = _phymod_get_attr_pin(phy, "pin.tx_fault", &sff->in.tx_fault);
if (err < 0)
goto exit;
err = _phymod_get_attr_pin(phy, "pin.rx_los", &sff->in.rx_los);
if (err < 0)
goto exit;
err = _phymod_get_attr_pin(phy, "pin.tx_disable", &sff->out.tx_disable);
if (err < 0)
goto exit;
err = pin_direction(priv->nfp, &sff->in.present, 0);
if (err < 0)
goto exit;
err = pin_direction(priv->nfp, &sff->in.tx_fault, 0);
if (err < 0)
goto exit;
err = pin_direction(priv->nfp, &sff->in.rx_los, 0);
if (err < 0)
goto exit;
err = pin_direction(priv->nfp, &sff->out.tx_disable, 1);
if (err < 0)
goto exit;
err = _phymod_get_attr_bus(phy, "SFF-8431", &sff->bus[0]);
if (err < 0)
goto exit;
err = _phymod_get_attr_bus(phy, "SFF-8472", &sff->bus[1]);
/* Optional, so err is not checked */
if (err < 0) {
err = 0;
sff->bus[1].op = NULL;
}
phy->sff.priv = sff;
return 0;
exit:
kfree(sff);
return err;
}
/*
* Generate all moves that evade check in the given position. This is purely
* legal move generation; no pseudo-legal moves.
*/
int generate_evasions(const position_t* pos, move_t* moves)
{
assert(pos->is_check && pos->board[pos->check_square]);
move_t* moves_head = moves;
color_t side = pos->side_to_move, other_side = side^1;
square_t king_sq = pos->pieces[side][0];
square_t check_sq = pos->check_square;
piece_t king = create_piece(side, KING);
piece_t checker = pos->board[check_sq];
// Generate king moves.
// Don't let the king mask its possible destination squares in calls
// to is_square_attacked.
square_t from = king_sq, to = INVALID_SQUARE;
((position_t*)pos)->board[king_sq] = EMPTY;
for (const direction_t* delta = piece_deltas[king]; *delta; ++delta) {
to = from + *delta;
piece_t capture = pos->board[to];
if (capture != EMPTY && !can_capture(king, capture)) continue;
if (is_square_attacked((position_t*)pos,to,other_side)) continue;
((position_t*)pos)->board[king_sq] = king;
moves = add_move(pos, create_move(from, to, king, capture), moves);
((position_t*)pos)->board[king_sq] = EMPTY;
}
((position_t*)pos)->board[king_sq] = king;
// If there are multiple checkers, only king moves are possible.
if (pos->is_check > 1) {
*moves = 0;
return moves-moves_head;
}
// First, the most common case: a check that can be evaded via an
// en passant capture. Note that if we're in check and an en passant
// capture is available, the only way the en passant capture would evade
// the check is if it's the newly moved pawn that's checking us.
direction_t pin_dir;
if (pos->ep_square != EMPTY &&
check_sq+pawn_push[side] == pos->ep_square &&
pos->board[pos->ep_square] == EMPTY) {
piece_t our_pawn = create_piece(side, PAWN);
to = pos->ep_square;
for (int i=0; i<2; ++i) {
from = to-piece_deltas[our_pawn][i];
if (pos->board[from] && pos->board[from] == our_pawn) {
pin_dir = pin_direction(pos, from, king_sq);
if (pin_dir) continue;
moves = add_move(pos,
create_move_enpassant(from, to, our_pawn, checker),
moves);
}
}
}
// Generate captures of the checker.
for (int i = 0; i < pos->num_pawns[side]; ++i) {
from = pos->pawns[side][i];
piece_t piece = create_piece(side, PAWN);
pin_dir = pin_direction(pos, from, king_sq);
if (pin_dir) continue;
if (!possible_attack(from, check_sq, piece)) continue;
if (relative_rank[side][square_rank(from)] == RANK_7) {
// Capture and promote.
for (piece_t promoted=QUEEN; promoted > PAWN; --promoted) {
moves = add_move(pos,
create_move_promote(from, check_sq, piece,
checker, promoted),
moves);
}
} else {
moves = add_move(pos,
create_move(from, check_sq, piece, checker),
moves);
}
}
for (int i = 1; i < pos->num_pieces[side]; ++i) {
from = pos->pieces[side][i];
piece_t piece = pos->board[from];
pin_dir = pin_direction(pos, from, king_sq);
if (pin_dir) continue;
if (!possible_attack(from, check_sq, piece)) continue;
if (piece_slide_type(piece) == NONE) {
moves = add_move(pos,
create_move(from, check_sq, piece, checker),
moves);
} else {
// A sliding piece, keep going until we hit something.
direction_t check_dir = direction(from, check_sq);
for (to=from+check_dir; pos->board[to] == EMPTY; to+=check_dir) {}
if (to == check_sq) {
moves = add_move(pos,
create_move(from, to, piece, checker),
moves);
continue;
}
}
}
if (piece_slide_type(checker) == NONE) {
*moves = 0;
return moves-moves_head;
}
// A slider is doing the checking; generate blocking moves.
direction_t block_dir = direction(check_sq, king_sq);
for (int i = 0; i < pos->num_pawns[side]; ++i) {
from = pos->pawns[side][i];
piece_t piece = create_piece(side, PAWN);
direction_t k_dir;
pin_dir = pin_direction(pos, from, king_sq);
if (pin_dir) continue;
to = from + pawn_push[side];
if (pos->board[to] != EMPTY) continue;
rank_t rank = relative_rank[side][square_rank(from)];
k_dir = direction(to, king_sq);
if (k_dir == block_dir &&
((king_sq < to && check_sq > to) ||
(king_sq > to && check_sq < to))) {
if (rank == RANK_7) {
// Block and promote.
for (piece_t promoted=QUEEN; promoted > PAWN; --promoted) {
moves = add_move(pos,
create_move_promote(from, to, piece, EMPTY, promoted),
moves);
}
} else {
moves = add_move(pos,
create_move(from, to, piece, EMPTY),
moves);
}
}
if (rank != RANK_2) continue;
to += pawn_push[side];
if (pos->board[to]) continue;
k_dir = direction(to, king_sq);
if (k_dir == block_dir &&
((king_sq < to && check_sq > to) ||
(king_sq > to && check_sq < to))) {
moves = add_move(pos,
create_move(from, to, piece, EMPTY),
moves);
}
}
for (int i=1; i<pos->num_pieces[side]; ++i) {
from = pos->pieces[side][i];
piece_t piece = pos->board[from];
direction_t k_dir;
pin_dir = pin_direction(pos, from, king_sq);
if (pin_dir) continue;
if (piece_is_type(piece, KNIGHT)) {
for (const direction_t* delta=piece_deltas[piece];
*delta; ++delta) {
to = from + *delta;
if (pos->board[to] != EMPTY) continue;
k_dir = direction(to, king_sq);
if (k_dir == block_dir &&
((king_sq < to && check_sq > to) ||
(king_sq > to && check_sq < to))) {
moves = add_move(pos,
create_move(from, to, piece, EMPTY),
moves);
}
}
} else {
for (const direction_t* delta=piece_deltas[piece];
*delta; ++delta) {
for (to = from+*delta; pos->board[to] == EMPTY; to+=*delta) {
k_dir = direction(to, king_sq);
if (k_dir == block_dir &&
((king_sq < to && check_sq > to) ||
(king_sq > to && check_sq < to))) {
moves = add_move(pos,
create_move(from, to, piece, EMPTY),
moves);
break;
}
}
}
}
}
*moves = 0;
return moves-moves_head;
}