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call_prom.c

/*
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 * 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
 * 2 of the License, or (at your option) any later version.
 */

#include "of1275.h"
#include <stdarg.h>

int call_prom(const char *service, int nargs, int nret, ...)
{
      int i;
      struct prom_args {
            const char *service;
            int nargs;
            int nret;
            unsigned int args[12];
      } args;
      va_list list;

      args.service = service;
      args.nargs = nargs;
      args.nret = nret;

      va_start(list, nret);
      for (i = 0; i < nargs; i++)
            args.args[i] = va_arg(list, unsigned int);
      va_end(list);

      for (i = 0; i < nret; i++)
            args.args[nargs+i] = 0;

      if (of_prom_entry(&args) < 0)
            return -1;

      return (nret > 0)? args.args[nargs]: 0;
}

int call_prom_ret(const char *service, int nargs, int nret,
              unsigned int *rets, ...)
{
      int i;
      struct prom_args {
            const char *service;
            int nargs;
            int nret;
            unsigned int args[12];
      } args;
      va_list list;

      args.service = service;
      args.nargs = nargs;
      args.nret = nret;

      va_start(list, rets);
      for (i = 0; i < nargs; i++)
            args.args[i] = va_arg(list, unsigned int);
      va_end(list);

      for (i = 0; i < nret; i++)
            args.args[nargs+i] = 0;

      if (of_prom_entry(&args) < 0)
            return -1;

      if (rets != (void *) 0)
            for (i = 1; i < nret; ++i)
                  rets[i-1] = args.args[nargs+i];

      return (nret > 0)? args.args[nargs]: 0;
}

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