caller.c

#include <stdlib.h>
#include "sema.h"
#include "api/caller.h"

void*_api_call_start(api_id_t id, uintptr_t size)
{
	while (SEMA_GetSema(_API_SEMAPHORE) == E_BUSY) {}

	/* TODO: Check flag */

	API_CALL_MEM->id = id;
	return API_CALL_MEM->buffer;
}

void*_api_call_transact(void*buffer)
{
	API_CALL_MEM->call_flag = _API_FLAG_CALLING;
	SEMA_FreeSema(_API_SEMAPHORE);

	/* Notify the dispather of the new call */
	__SEV();
	__WFE();

	while (1) {
		/* Wait for the dispather to return */
		__WFE();

		while (SEMA_GetSema(_API_SEMAPHORE) == E_BUSY) {}
		if (API_CALL_MEM->call_flag == _API_FLAG_RETURNED) {
			break;
		}
		SEMA_FreeSema(_API_SEMAPHORE);
	}

	API_CALL_MEM->call_flag = _API_FLAG_IDLE;
	SEMA_FreeSema(_API_SEMAPHORE);

	return API_CALL_MEM->buffer;
}