kernel/thread.cpp

   1 /*
   2 lightOS kernel
   3 Copyright (C) 2006-2009 Jörg Pfähler
   4
   5 This program is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18 */
  19 #include <cstddef>
  20 #include <kernel/thread.hpp>
  21 #include <kernel/scheduler.hpp>
  22 #include <lightOS/c++utils.hpp>
  23 #include <kernel/processor.hpp>
  24 #include <kernel/page_allocator.hpp>
  25
  26 #include <kernel/virtual_memory.hpp>
  27 using namespace std;
  28 using kernel::thread;
  29 using kernel::virtual_memory;
  30
  31 bool thread::handle_page_fault(void *address)
  32 {
  33         page_allocator &PageAllocator = page_allocator::instance();
  34         uintptr_t pfAddress = reinterpret_cast<uintptr_t>(address);
  35         if (pfAddress < (reinterpret_cast<uintptr_t>(threadStack) - threadStackSize) &&
  36                 pfAddress > (reinterpret_cast<uintptr_t>(threadStack) - 1024 * 1024))
  37         {
  38                 size_t pages = (reinterpret_cast<uintptr_t>(threadStack) + threadStackSize - pfAddress + virtual_memory::page_size - 1) / virtual_memory::page_size;
  39
  40                 for (size_t i = 0;i < pages;i++)
  41                 {
  42                         context &Context = Process.getContext();
  43                         void *page = PageAllocator.allocate();
  44                         Process.mPages.push_back(page);
  45                         Context.map(page,
  46                                                 adjust_pointer(threadStack, - threadStackSize - virtual_memory::page_size),
  47                                                 lightOS::context::write | lightOS::context::user);
  48                         threadStackSize += virtual_memory::page_size;
  49                 }
  50                 return true;
  51         }
  52         return false;
  53 }
  54 void thread::block(state reason)
  55 {
  56         if (reason == run)return;
  57         if (State == run)
  58         {
  59                 scheduler::remove(this);
  60         }
  61         State = reason;
  62 }
  63 void thread::unblock()
  64 {
  65         if (State == run)return;
  66         State = run;
  67
  68         scheduler::add(this);
  69 }
  70 thread::~thread()
  71 {
  72         processor::free_fpu_state(this);
  73
  74         scheduler::remove(this);
  75 }