payloads/libpayload/arch/x86/main.c

   1 /*
   2  *
   3  * Copyright (C) 2008 Advanced Micro Devices, Inc.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <exception.h>
  30 #include <libpayload.h>
  31 #include <arch/apic.h>
  32
  33 unsigned long loader_eax;  /**< The value of EAX passed from the loader */
  34 unsigned long loader_ebx;  /**< The value of EBX passed from the loader */
  35
  36 int main_argc;    /**< The argc value to pass to main() */
  37
  38 /** The argv value to pass to main() */
  39 char *main_argv[MAX_ARGC_COUNT];
  40
  41 /**
  42  * This is our C entry function - set up the system
  43  * and jump into the payload entry point.
  44  */
  45 int start_main(void);
  46 int start_main(void)
  47 {
  48         extern int main(int argc, char **argv);
  49
  50         /* Gather system information. */
  51         lib_get_sysinfo();
  52
  53         /* Optionally set up the consoles. */
  54 #if !CONFIG(LP_SKIP_CONSOLE_INIT)
  55         console_init();
  56 #endif
  57
  58         exception_init();
  59
  60         if (CONFIG(LP_ENABLE_APIC)) {
  61                 apic_init();
  62
  63                 enable_interrupts();
  64         }
  65
  66         /*
  67          * Any other system init that has to happen before the
  68          * user gets control goes here.
  69          */
  70
  71         /*
  72          * Go to the entry point.
  73          * In the future we may care about the return value.
  74          */
  75
  76         /*
  77          * Returning from main() will go to the _leave function to return
  78          * us to the original context.
  79          */
  80         return main(main_argc, (main_argc != 0) ? main_argv : NULL);
  81 }