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/* very simple grid node with 32bit private region, does not currently signal
* being busy or anything. I think I might have to refine the message passing
* interface I have, but this is good enough.
*
* Each node should have a router beneath it, just to simplify my life. A router
* is basically a bus with a fallback ascension path.
*/
#include <stdbool.h>
#include <gran/grid/node.h>
struct port {
struct component *send;
struct packet pkt;
bool busy;
};
struct grid_node {
struct component component;
uint16_t x, y;
struct port left, right, up, down, lower;
unsigned priority;
};
static stat port_clock(struct grid_node *grid, struct port *to, struct port *from)
{
assert(from->busy);
stat r = SEND(grid, to->send, from->pkt);
if (r == EBUSY) {
grid->priority++;
return OK;
}
from->busy = false;
return OK;
}
static struct port *select_input(struct grid_node *grid)
{
struct port *ports[5] = {
&grid->left,
&grid->right,
&grid->up,
&grid->down,
&grid->lower,
};
for (size_t i = 0; i < 5; ++i) {
size_t idx = (i + grid->priority) % 5;
struct port *port = ports[idx];
if (!port)
continue;
if (!port->busy)
continue;
return port;
}
return NULL;
}
static stat clock_once(struct grid_node *grid)
{
struct port *input = select_input(grid);
if (!input)
return OK;
uint16_t x;
uint16_t y;
uint64_t addr = input->pkt.to;
addr_grid(addr, NULL, &x, &y);
if (grid->x == x && grid->y == y) {
if (!grid->lower.send)
goto nosuch;
return port_clock(grid, &grid->lower, input);
}
if (y < grid->y) {
if (!grid->down.send)
goto nosuch;
return port_clock(grid, &grid->down, input);
}
if (y > grid->y) {
if (!grid->up.send)
goto nosuch;
return port_clock(grid, &grid->up, input);
}
if (x < grid->x) {
if (!grid->left.send)
goto nosuch;
return port_clock(grid, &grid->left, input);
}
if (x > grid->x) {
if (!grid->right.send)
goto nosuch;
return port_clock(grid, &grid->right, input);
}
nosuch:
abort();
return OK;
}
static stat grid_clock(struct grid_node *grid)
{
clock_once(grid);
return OK;
}
static stat port_receive(struct port *port, struct packet pkt)
{
if (port->busy)
return EBUSY;
port->pkt = pkt;
port->busy = true;
return OK;
}
static stat grid_receive(struct grid_node *grid, struct component *from, struct packet pkt)
{
if (from == grid->lower.send)
return port_receive(&grid->lower, pkt);
if (from == grid->left.send)
return port_receive(&grid->left, pkt);
if (from == grid->right.send)
return port_receive(&grid->right, pkt);
if (from == grid->down.send)
return port_receive(&grid->down, pkt);
if (from == grid->up.send)
return port_receive(&grid->up, pkt);
abort();
return OK;
}
struct component *create_grid_node(uint16_t x, uint16_t y)
{
struct grid_node *node = calloc(1, sizeof(struct grid_node));
if (!node)
return NULL;
node->component.receive = (receive_callback)grid_receive;
node->component.clock = (clock_callback)grid_clock;
node->x = x;
node->y = y;
return (struct component *)node;
}
stat grid_node_connect(struct component *node,
struct component *left, struct component *right,
struct component *up, struct component *down,
struct component *lower)
{
struct grid_node *n = (struct grid_node *)node;
n->left.send = left;
n->right.send = right;
n->up.send = up;
n->down.send = down;
n->lower.send = lower;
return OK;
}
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