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
   8  */
   9
  10 /* INCLUDES ******************************************************************/
  11
  12 #include <hal.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* PRIVATE FUNCTIONS *********************************************************/
  17
  18 VOID
  19 NTAPI
  20 HalpWriteResetCommand(VOID)
  21 {
  22     /* Generate RESET signal via keyboard controller */
  23     WRITE_PORT_UCHAR((PUCHAR)0x64, 0xFE);
  24 };
  25
  26 VOID
  27 NTAPI
  28 HalpReboot(VOID)
  29 {
  30     PHYSICAL_ADDRESS PhysicalAddress;
  31     UCHAR Data;
  32     PVOID ZeroPageMapping;
  33
  34     /* Map the first physical page */
  35     PhysicalAddress.QuadPart = 0;
  36     ZeroPageMapping = HalpMapPhysicalMemory64(PhysicalAddress, 1);
  37
  38     /* Enable warm reboot */
  39     ((PUSHORT)ZeroPageMapping)[0x239] = 0x1234;
  40
  41     /* Lock CMOS Access (and disable interrupts) */
  42     HalpAcquireCmosSpinLock();
  43
  44     /* Setup control register B */
  45     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
  46     KeStallExecutionProcessor(1);
  47
  48     /* Read periodic register and clear the interrupt enable */
  49     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  50     WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
  51     KeStallExecutionProcessor(1);
  52
  53     /* Setup control register A */
  54     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
  55     KeStallExecutionProcessor(1);
  56
  57     /* Read divider rate and reset it */
  58     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  59     WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
  60     KeStallExecutionProcessor(1);
  61
  62     /* Reset neutral CMOS address */
  63     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
  64     KeStallExecutionProcessor(1);
  65
  66     /* Flush write buffers and send the reset command */
  67     KeFlushWriteBuffer();
  68     HalpWriteResetCommand();
  69
  70     /* Halt the CPU */
  71     __halt();
  72 }
  73
  74 /* PUBLIC FUNCTIONS **********************************************************/
  75
  76 /*
  77  * @implemented
  78  */
  79 VOID
  80 NTAPI
  81 HalReturnToFirmware(IN FIRMWARE_REENTRY Action)
  82 {
  83     /* Check what kind of action this is */
  84     switch (Action)
  85     {
  86         /* All recognized actions */
  87         case HalHaltRoutine:
  88         case HalRebootRoutine:
  89
  90 #ifndef _MINIHAL_
  91             /* Acquire the display */
  92             InbvAcquireDisplayOwnership();
  93 #endif
  94
  95             /* Call the internal reboot function */
  96             HalpReboot();
  97
  98         /* Anything else */
  99         default:
 100
 101             /* Print message and break */
 102             DbgPrint("HalReturnToFirmware called!\n");
 103             DbgBreakPoint();
 104     }
 105 }
 106
 107 /* EOF */