reactos/hal/halx86/generic/reboot.c

   1 /*
   2  * PROJECT:         ReactOS HAL
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            hal/halx86/generic/reboot.c
   5  * PURPOSE:         Reboot functions
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  *                  Eric Kohl (ekohl@abo.rhein-zeitung.de)
   8  */
   9
  10 /* INCLUDES ******************************************************************/
  11
  12 #include <hal.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* PRIVATE FUNCTIONS *********************************************************/
  17
  18 static VOID
  19 NTAPI
  20 HalpWriteResetCommand(VOID)
  21 {
  22     /* Generate RESET signal via keyboard controller */
  23     WRITE_PORT_UCHAR((PUCHAR)0x64, 0xFE);
  24 };
  25
  26 static VOID
  27 NTAPI
  28 HalpReboot(VOID)
  29 {
  30     UCHAR Data;
  31     PVOID HalpZeroPageMapping;
  32     PHYSICAL_ADDRESS Null = {{0}};
  33
  34     /* Enable warm reboot */
  35     HalpZeroPageMapping = MmMapIoSpace(Null, PAGE_SIZE, MmNonCached);
  36     ((PUSHORT)HalpZeroPageMapping)[0x239] = 0x1234;
  37
  38     /* FIXME: Lock CMOS Access */
  39
  40     /* Disable interrupts */
  41     _disable();
  42
  43     /* Setup control register B */
  44     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
  45     KeStallExecutionProcessor(1);
  46
  47     /* Read periodic register and clear the interrupt enable */
  48     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  49     WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
  50     KeStallExecutionProcessor(1);
  51
  52     /* Setup control register A */
  53     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
  54     KeStallExecutionProcessor(1);
  55
  56     /* Read divider rate and reset it */
  57     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  58     WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
  59     KeStallExecutionProcessor(1);
  60
  61     /* Reset neutral CMOS address */
  62     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
  63     KeStallExecutionProcessor(1);
  64
  65     /* Flush write buffers and send the reset command */
  66     KeFlushWriteBuffer();
  67     HalpWriteResetCommand();
  68
  69     /* Halt the CPU */
  70     Ke386HaltProcessor();
  71 }
  72
  73 /* PUBLIC FUNCTIONS **********************************************************/
  74
  75 /*
  76  * @implemented
  77  */
  78 VOID
  79 NTAPI
  80 HalReturnToFirmware(IN FIRMWARE_REENTRY Action)
  81 {
  82     /* Check the kind of action this is */
  83     switch (Action)
  84     {
  85         /* All recognized actions */
  86         case HalHaltRoutine:
  87         case HalRebootRoutine:
  88
  89             /* Call the internal reboot function */
  90             HalpReboot();
  91
  92         /* Anything else */
  93         default:
  94
  95             /* Print message and break */
  96             DbgPrint("HalReturnToFirmware called!\n");
  97             DbgBreakPoint();
  98     }
  99 }
 100
 101 /* EOF */