hal/halx86/amd64/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 <reactos/asm.h>
  11 #include <ndk/amd64/asm.h>
  12
  13 /* GLOBALS *******************************************************************/
  14
  15 .data
  16
  17 .global MsgUnimplemented
  18 MsgUnimplemented:
  19 .asciz "WARNING:  %s at %s:%d is UNIMPLEMENTED!\n"
  20
  21
  22 /* FUNCTIONS *****************************************************************/
  23
  24 .text
  25 .code64
  26
  27 PUBLIC HalpCalibrateStallExecution@0
  28 HalpCalibrateStallExecution@0:
  29
  30
  31 PUBLIC HalpProfileInterrupt
  32 HalpProfileInterrupt:
  33
  34
  35 PUBLIC KeStallExecutionProcessor
  36 KeStallExecutionProcessor:
  37
  38     /* Get the number of microseconds required */
  39     jecxz Done
  40
  41     /* Multiply by the stall factor */
  42     mov eax, gs:[KPCR_STALL_SCALE_FACTOR]
  43     mul ecx
  44
  45     /* Align to 16 bytes */
  46     .align 16
  47
  48     /* Jump to subtraction loop */
  49     jmp SubtractLoop
  50
  51     /* Align to 16 bytes */
  52     .align 16
  53
  54     /* Subtract one count */
  55 SubtractLoop:
  56     sub eax, 1
  57     jnz SubtractLoop
  58
  59 Done:
  60     /* Return */
  61     ret 4
  62
  63
  64 PUBLIC HalpQuery8254Counter
  65 HalpQuery8254Counter:
  66
  67     /* Save EFLAGS and disable interrupts */
  68     pushfq
  69     cli
  70
  71     /* Set timer data */
  72     mov al, 0
  73     out 0x43, al
  74     jmp $+2
  75
  76     /* Read current timer */
  77     in al, 0x40
  78     jmp $+2
  79     movzx ecx, al
  80     in al, 0x40
  81     mov ch, al
  82
  83     /* Return it and restore interrupt state */
  84     mov eax, ecx
  85     popfq
  86     ret
  87
  88 PUBLIC HalpClockInterrupt
  89 HalpClockInterrupt:
  90     UNIMPLEMENTED _HalpClockInterrupt
  91     iret
  92