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 #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     /* FIXME: Lock CMOS Access */
  53
  54     /* Disable interrupts */
  55     _disable();
  56
  57     /* Setup control register B */
  58     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0B);
  59     KeStallExecutionProcessor(1);
  60
  61     /* Read periodic register and clear the interrupt enable */
  62     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  63     WRITE_PORT_UCHAR((PUCHAR)0x71, Data & ~0x40);
  64     KeStallExecutionProcessor(1);
  65
  66     /* Setup control register A */
  67     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x0A);
  68     KeStallExecutionProcessor(1);
  69
  70     /* Read divider rate and reset it */
  71     Data = READ_PORT_UCHAR((PUCHAR)0x71);
  72     WRITE_PORT_UCHAR((PUCHAR)0x71, (Data & ~0x9) | 0x06);
  73     KeStallExecutionProcessor(1);
  74
  75     /* Reset neutral CMOS address */
  76     WRITE_PORT_UCHAR((PUCHAR)0x70, 0x15);
  77     KeStallExecutionProcessor(1);
  78
  79     /* Flush write buffers and send the reset command */
  80     KeFlushWriteBuffer();
  81     HalpWriteResetCommand();
  82
  83     /* Halt the CPU */
  84     __halt();
  85 }
  86
  87 /* PUBLIC FUNCTIONS **********************************************************/
  88
  89 /*
  90  * @implemented
  91  */
  92 VOID
  93 NTAPI
  94 HalReturnToFirmware(IN FIRMWARE_REENTRY Action)
  95 {
  96     /* Check what kind of action this is */
  97     switch (Action)
  98     {
  99         /* All recognized actions */
 100         case HalHaltRoutine:
 101         case HalRebootRoutine:
 102
 103             /* Acquire the display */
 104             InbvAcquireDisplayOwnership();
 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 */