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https://github.com/reactos/reactos.git
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93 lines
1.7 KiB
ArmAsm
93 lines
1.7 KiB
ArmAsm
/*
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* FILE: hal/halx86/generic/timer.S
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* COPYRIGHT: See COPYING in the top level directory
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* PURPOSE: System Timer Interrupt and Management
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* PROGRAMMER: Alex Ionescu (alex@relsoft.net)
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*/
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/* INCLUDES ******************************************************************/
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#include <reactos/asm.h>
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#include <ndk/amd64/asm.h>
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/* GLOBALS *******************************************************************/
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.data
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.global MsgUnimplemented
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MsgUnimplemented:
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.asciz "WARNING: %s at %s:%d is UNIMPLEMENTED!\n"
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/* FUNCTIONS *****************************************************************/
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.text
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.code64
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PUBLIC HalpCalibrateStallExecution@0
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HalpCalibrateStallExecution@0:
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PUBLIC HalpProfileInterrupt
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HalpProfileInterrupt:
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PUBLIC KeStallExecutionProcessor
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KeStallExecutionProcessor:
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/* Get the number of microseconds required */
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jecxz Done
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/* Multiply by the stall factor */
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mov eax, gs:[KPCR_STALL_SCALE_FACTOR]
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mul ecx
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/* Align to 16 bytes */
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.align 16
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/* Jump to subtraction loop */
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jmp SubtractLoop
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/* Align to 16 bytes */
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.align 16
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/* Subtract one count */
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SubtractLoop:
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sub eax, 1
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jnz SubtractLoop
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Done:
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/* Return */
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ret 4
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PUBLIC HalpQuery8254Counter
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HalpQuery8254Counter:
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/* Save EFLAGS and disable interrupts */
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pushfq
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cli
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/* Set timer data */
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mov al, 0
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out 0x43, al
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jmp $+2
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/* Read current timer */
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in al, 0x40
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jmp $+2
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movzx ecx, al
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in al, 0x40
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mov ch, al
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/* Return it and restore interrupt state */
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mov eax, ecx
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popfq
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ret
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PUBLIC HalpClockInterrupt
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HalpClockInterrupt:
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UNIMPLEMENTED _HalpClockInterrupt
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iret
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