reactos/hal/halamd64/generic/systimer.S

   1 /*
   2  * FILE:            hal/halx86/generic/timer.S
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PURPOSE:         System Timer Interrupt and Management
   5  * PROGRAMMER:      Alex Ionescu (alex@relsoft.net)
   6  */
   7
   8 /* INCLUDES ******************************************************************/
   9
  10 #include <asm.h>
  11 #include <ndk/amd64/asmmacro.S>
  12
  13 /* GLOBALS *******************************************************************/
  14
  15 .data
  16
  17 _UnhandledMsg:
  18     .asciz "\n\x7\x7!!! Unhandled or Unexpected Code at line: %lx!!!\n"
  19
  20 .global _MsgUnimplemented
  21 _MsgUnimplemented:
  22 .asciz "WARNING:  %s at %s:%d is UNIMPLEMENTED!\n"
  23
  24
  25 /* FUNCTIONS *****************************************************************/
  26
  27 .text
  28 .code64
  29
  30 .global _HalpReleaseCmosSpinLock
  31 .func HalpReleaseCmosSpinLock
  32 _HalpReleaseCmosSpinLock:
  33
  34 .endfunc
  35
  36 .global _HalpAcquireSystemHardwareSpinLock
  37 .func HalpAcquireSystemHardwareSpinLock
  38 _HalpAcquireSystemHardwareSpinLock:
  39
  40 .endfunc
  41
  42 .global _HalpCalibrateStallExecution@0
  43 .func HalpCalibrateStallExecution@0
  44 _HalpCalibrateStallExecution@0:
  45
  46 .endfunc
  47
  48 .globl _HalpProfileInterrupt
  49 .func HalpProfileInterrupt
  50 _HalpProfileInterrupt:
  51
  52 .endfunc
  53
  54
  55 .globl _KeStallExecutionProcessor
  56 .func KeStallExecutionProcessor
  57 _KeStallExecutionProcessor:
  58
  59     /* Get the number of microseconds required */
  60     jecxz Done
  61
  62     /* Multiply by the stall factor */
  63     mov eax, gs:[KPCR_STALL_SCALE_FACTOR]
  64     mul ecx
  65
  66     /* Align to 16 bytes */
  67     .align 16
  68
  69     /* Jump to subtraction loop */
  70     jmp SubtractLoop
  71
  72     /* Align to 16 bytes */
  73     .align 16
  74
  75     /* Subtract one count */
  76 SubtractLoop:
  77     sub eax, 1
  78     jnz SubtractLoop
  79
  80 Done:
  81     /* Return */
  82     ret 4
  83 .endfunc
  84
  85
  86 .globl _HalpQuery8254Counter
  87 .func HalpQuery8254Counter
  88 _HalpQuery8254Counter:
  89
  90     /* Save EFLAGS and disable interrupts */
  91     pushfq
  92     cli
  93
  94     /* Set timer data */
  95     mov al, 0
  96     out 0x43, al
  97     jmp $+2
  98
  99     /* Read current timer */
 100     in al, 0x40
 101     jmp $+2
 102     movzx ecx, al
 103     in al, 0x40
 104     mov ch, al
 105
 106     /* Return it and restore interrupt state */
 107     mov eax, ecx
 108     popfq
 109     ret
 110 .endfunc
 111
 112 .globl _HalpClockInterrupt
 113 .func HalpClockInterrupt
 114 _HalpClockInterrupt:
 115     UNIMPLEMENTED _HalpClockInterrupt
 116     iret
 117 .endfunc
 118