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
  14 /* PRIVATE FUNCTIONS *********************************************************/
  15
  16 static VOID
  17 HalpWriteResetCommand(VOID)
  18 {
  19     /* Generate RESET signal via keyboard controller */
  20     WRITE_PORT_UCHAR((PUCHAR)0x64, 0xFE);
  21 };
  22
  23 DECLSPEC_NORETURN
  24 VOID
  25 HalpReboot(VOID)
  26 {
  27     PHYSICAL_ADDRESS PhysicalAddress;
  28     UCHAR Data;
  29     PVOID ZeroPageMapping;
  30
  31     /* Map the first physical page */
  32     PhysicalAddress.QuadPart = 0;
  33     ZeroPageMapping = HalpMapPhysicalMemory64(PhysicalAddress, 1);
  34
  35     /* Enable warm reboot */
  36     ((PUSHORT)ZeroPageMapping)[0x239] = 0x1234;
  37
  38     /* Lock CMOS Access (and disable interrupts) */
  39     HalpAcquireCmosSpinLock();
  40
  41     /* Setup control register B */
  42     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
  43     KeStallExecutionProcessor(1);
  44
  45     /* Read periodic register and clear the interrupt enable */
  46     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  47     WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
  48     KeStallExecutionProcessor(1);
  49
  50     /* Setup control register A */
  51     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
  52     KeStallExecutionProcessor(1);
  53
  54     /* Read divider rate and reset it */
  55     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  56     WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
  57     KeStallExecutionProcessor(1);
  58
  59     /* Reset neutral CMOS address */
  60     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
  61     KeStallExecutionProcessor(1);
  62
  63     /* Flush write buffers and send the reset command */
  64     KeFlushWriteBuffer();
  65     HalpWriteResetCommand();
  66
  67     /* Halt the CPU */
  68     __halt();
  69     UNREACHABLE;
  70 }
  71
  72 /* PUBLIC FUNCTIONS **********************************************************/
  73
  74 #ifndef _MINIHAL_
  75 /*
  76  * @implemented
  77  */
  78 VOID
  79 NTAPI
  80 HalReturnToFirmware(
  81     _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 HalPowerDownRoutine:
  89         case HalRestartRoutine:
  90         case HalRebootRoutine:
  91         {
  92             /* Acquire the display */
  93             InbvAcquireDisplayOwnership();
  94
  95             /* Call the internal reboot function */
  96             HalpReboot();
  97         }
  98
  99         /* Anything else */
 100         default:
 101         {
 102             /* Print message and break */
 103             DbgPrint("HalReturnToFirmware called!\n");
 104             DbgBreakPoint();
 105         }
 106     }
 107 }
 108 #endif // _MINIHAL_
 109
 110 /* EOF */