release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/power/cpu.c

   1 /*
   2  * Suspend support specific for mips.
   3  *
   4  * Licensed under the GPLv2
   5  *
   6  * Copyright (C) 2009 Lemote Inc.
   7  * Author: Hu Hongbing <huhb@lemote.com>
   8  *         Wu Zhangjin <wuzhangjin@gmail.com>
   9  */
  10 #include <asm/suspend.h>
  11 #include <asm/fpu.h>
  12 #include <asm/dsp.h>
  13
  14 static u32 saved_status;
  15 struct pt_regs saved_regs;
  16
  17 void save_processor_state(void)
  18 {
  19         saved_status = read_c0_status();
  20
  21         if (is_fpu_owner())
  22                 save_fp(current);
  23         if (cpu_has_dsp)
  24                 save_dsp(current);
  25 }
  26
  27 void restore_processor_state(void)
  28 {
  29         write_c0_status(saved_status);
  30
  31         if (is_fpu_owner())
  32                 restore_fp(current);
  33         if (cpu_has_dsp)
  34                 restore_dsp(current);
  35 }
  36
  37 int pfn_is_nosave(unsigned long pfn)
  38 {
  39         unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
  40         unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
  41
  42         return  (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
  43 }