hal/halx86/pc98/reboot.c

   1 /*
   2  * PROJECT:     NEC PC-98 series HAL
   3  * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
   4  * PURPOSE:     Reboot routine
   5  * COPYRIGHT:   Copyright 2020 Dmitry Borisov (di.sean@protonmail.com)
   6  */
   7
   8 /* INCLUDES ******************************************************************/
   9
  10 #include <hal.h>
  11
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* PRIVATE FUNCTIONS *********************************************************/
  16
  17 static VOID
  18 DECLSPEC_NORETURN
  19 NTAPI
  20 HalpFreezeSystem(VOID)
  21 {
  22     HaliHaltSystem();
  23
  24     while (TRUE)
  25         NOTHING;
  26 }
  27
  28 VOID
  29 NTAPI
  30 HalpReboot(VOID)
  31 {
  32     /* Disable interrupts */
  33     _disable();
  34
  35     /* Flush write buffers */
  36     KeFlushWriteBuffer();
  37
  38     /* Send the reset command */
  39     WRITE_PORT_UCHAR((PUCHAR)PPI_IO_o_CONTROL, PPI_SHUTDOWN_0_ENABLE);
  40     WRITE_PORT_UCHAR((PUCHAR)PPI_IO_o_CONTROL, PPI_SHUTDOWN_1_ENABLE);
  41     WRITE_PORT_UCHAR((PUCHAR)CPU_IO_o_RESET, 0);
  42
  43     /* Halt the CPU */
  44     __halt();
  45 }
  46
  47 /* PUBLIC FUNCTIONS **********************************************************/
  48
  49 VOID
  50 NTAPI
  51 HalReturnToFirmware(
  52     _In_ FIRMWARE_REENTRY Action)
  53 {
  54     switch (Action)
  55     {
  56         case HalPowerDownRoutine:
  57             HalpFreezeSystem();
  58
  59         case HalHaltRoutine:
  60         case HalRebootRoutine:
  61 #ifndef _MINIHAL_
  62             /* Acquire the display */
  63             InbvAcquireDisplayOwnership();
  64 #endif
  65
  66             /* Call the internal reboot function */
  67             HalpReboot();
  68
  69         /* Anything else */
  70         default:
  71             /* Print message and break */
  72             DbgPrint("HalReturnToFirmware called!\n");
  73             DbgBreakPoint();
  74     }
  75 }