firmware/asm/thread-win32.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 by Thomas Martitz
  11  *
  12  * Generic ARM threading support
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23
  24
  25 #include <windows.h>
  26 #include "system.h"
  27
  28 #define INIT_MAIN_THREAD
  29
  30 #define THREAD_STARTUP_INIT(core, thread, function) \
  31     ({ (thread)->context.stack_size = (thread)->stack_size, \
  32        (thread)->context.stack = (uintptr_t)(thread)->stack; \
  33        (thread)->context.start = function; })
  34
  35 static void init_main_thread(void *addr)
  36 {
  37     struct regs *context = (struct regs*)addr;
  38     /* we must convert the current main thread to a fiber to be able to
  39      * schedule other fibers */
  40     context->uc = ConvertThreadToFiber(NULL);
  41     context->stack_size = 0;
  42 }
  43
  44 static inline void store_context(void* addr)
  45 {
  46     (void)addr;
  47     /* nothing to do here, Fibers continue after the SwitchToFiber call */
  48 }
  49
  50 static void start_thread(void)
  51 {
  52     void (*func)(void) = GetFiberData();
  53     func();
  54     /* go out if thread function returns */
  55     thread_exit();
  56 }
  57
  58 /*
  59  * Load context and run it
  60  *
  61  * Resume execution from the last load_context call for the thread
  62  */
  63
  64 static inline void load_context(const void* addr)
  65 {
  66     struct regs *context = (struct regs*)addr;
  67     if (UNLIKELY(context->start))
  68     {   /* need setup before switching to it */
  69         context->uc = CreateFiber(context->stack_size,
  70                         (LPFIBER_START_ROUTINE)start_thread, context->start);
  71         /* can't assign stack pointer, only stack size */
  72         context->stack_size = 0;
  73         context->start = NULL;
  74     }
  75     SwitchToFiber(context->uc);
  76 }