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 #define GetPteAddress(x) (PHARDWARE_PTE)(((((ULONG_PTR)(x)) >> 12) << 2) + 0xC0000000)
  17
  18 /* PRIVATE FUNCTIONS *********************************************************/
  19
  20 VOID
  21 NTAPI
  22 HalpWriteResetCommand(VOID)
  23 {
  24     /* Generate RESET signal via keyboard controller */
  25     WRITE_PORT_UCHAR((PUCHAR)0x64, 0xFE);
  26 };
  27
  28 VOID
  29 NTAPI
  30 HalpReboot(VOID)
  31 {
  32     UCHAR Data;
  33     PVOID ZeroPageMapping;
  34     PHARDWARE_PTE Pte;
  35
  36     /* Get a PTE in the HAL reserved region */
  37     ZeroPageMapping = (PVOID)(0xFFC00000 + PAGE_SIZE);
  38     Pte = GetPteAddress(ZeroPageMapping);
  39
  40     /* Make it valid and map it to the first physical page */
  41     Pte->Valid = 1;
  42     Pte->Write = 1;
  43     Pte->Owner = 1;
  44     Pte->PageFrameNumber = 0;
  45
  46     /* Flush the TLB by resetting CR3 */
  47     __writecr3(__readcr3());
  48
  49     /* Enable warm reboot */
  50     ((PUSHORT)ZeroPageMapping)[0x239] = 0x1234;
  51
  52     /* Lock CMOS Access (and disable interrupts) */
  53     HalpAcquireCmosSpinLock();
  54
  55     /* Setup control register B */
  56     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
  57     KeStallExecutionProcessor(1);
  58
  59     /* Read periodic register and clear the interrupt enable */
  60     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  61     WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
  62     KeStallExecutionProcessor(1);
  63
  64     /* Setup control register A */
  65     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
  66     KeStallExecutionProcessor(1);
  67
  68     /* Read divider rate and reset it */
  69     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  70     WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
  71     KeStallExecutionProcessor(1);
  72
  73     /* Reset neutral CMOS address */
  74     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
  75     KeStallExecutionProcessor(1);
  76
  77     /* Flush write buffers and send the reset command */
  78     KeFlushWriteBuffer();
  79     HalpWriteResetCommand();
  80
  81     /* Halt the CPU */
  82     __halt();
  83 }
  84
  85 /* PUBLIC FUNCTIONS **********************************************************/
  86
  87 /*
  88  * @implemented
  89  */
  90 VOID
  91 NTAPI
  92 HalReturnToFirmware(IN FIRMWARE_REENTRY Action)
  93 {
  94     /* Check what kind of action this is */
  95     switch (Action)
  96     {
  97         /* All recognized actions */
  98         case HalHaltRoutine:
  99         case HalRebootRoutine:
 100
 101 #ifndef _MINIHAL_
 102             /* Acquire the display */
 103             InbvAcquireDisplayOwnership();
 104 #endif
 105
 106             /* Call the internal reboot function */
 107             HalpReboot();
 108
 109         /* Anything else */
 110         default:
 111
 112             /* Print message and break */
 113             DbgPrint("HalReturnToFirmware called!\n");
 114             DbgBreakPoint();
 115     }
 116 }
 117
 118 /* EOF */