mirror of
https://github.com/reactos/reactos.git
synced 2024-11-19 05:22:59 +00:00
377 lines
7.7 KiB
ArmAsm
377 lines
7.7 KiB
ArmAsm
/*
|
|
* FILE: hal/halx86/generic/systimer.S
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PURPOSE: System Timer Interrupt and Management
|
|
* PROGRAMMER: Alex Ionescu (alex@relsoft.net)
|
|
*/
|
|
|
|
/* INCLUDES ******************************************************************/
|
|
|
|
#include <asm.inc>
|
|
|
|
#include <ks386.inc>
|
|
|
|
EXTERN _HalpAcquireCmosSpinLock@0:PROC
|
|
EXTERN _HalpReleaseCmosSpinLock@0:PROC
|
|
EXTERN _DbgBreakPoint@0:PROC
|
|
|
|
#define PIC1_BASE HEX(20) /* IO base address for master PIC */
|
|
#define PIC2_BASE HEX(A0) /* IO base address for slave PIC */
|
|
#define PIC1_COMMAND PIC1_BASE
|
|
#define PIC1_DATA (PIC1_BASE+1)
|
|
#define PIC2_COMMAND PIC2_BASE
|
|
#define PIC2_DATA (PIC2_BASE+1)
|
|
#define PIC_EOI HEX(20)
|
|
#define PIC_SPECIFIC_EOI2 HEX(62)
|
|
|
|
#define CMOS_ADDR HEX(70)
|
|
#define CMOS_DATA HEX(71)
|
|
#define CMOS_REGISTER_A HEX(0A)
|
|
#define CMOS_REGISTER_B HEX(0B)
|
|
#define CMOS_REGISTER_C HEX(0C)
|
|
#define CMOS_REGISTER_D HEX(0D)
|
|
|
|
#define PIT_CH0 HEX(40)
|
|
#define PIT_MODE HEX(43)
|
|
#define SYSTEM_CTRL_PORT_A HEX(92)
|
|
|
|
/* GLOBALS *******************************************************************/
|
|
|
|
.data
|
|
ASSUME CS:NOTHING, DS:NOTHING, ES:NOTHING, FS:NOTHING, GS:NOTHING
|
|
|
|
/* FUNCTIONS *****************************************************************/
|
|
|
|
.code
|
|
PUBLIC _HalpCalibrateStallExecution@0
|
|
_HalpCalibrateStallExecution@0:
|
|
|
|
/* Setup the stack frame */
|
|
push ebp
|
|
mov ebp, esp
|
|
sub esp, 12
|
|
|
|
/* Save EFLAGS and kill interrupts */
|
|
pushfd
|
|
cli
|
|
|
|
/* Get the current interrupt mask on the PICs */
|
|
xor eax, eax
|
|
in al, PIC2_DATA
|
|
shl eax, 8
|
|
in al, PIC1_DATA
|
|
|
|
/* Save it */
|
|
push eax
|
|
|
|
/* Now mask everything except the RTC and PIC 2 chain-interrupt */
|
|
mov eax, NOT (HEX(04) OR HEX(100))
|
|
|
|
/* Program the PICs */
|
|
out PIC1_DATA, al
|
|
shr eax, 8
|
|
out PIC2_DATA, al
|
|
|
|
/* Now get the IDT */
|
|
sidt [ebp-8]
|
|
mov ecx, [ebp-6]
|
|
|
|
/* Get the IDT entry for the RTC */
|
|
mov eax, HEX(38)
|
|
shl eax, 3
|
|
add ecx, eax
|
|
|
|
/* Save the original RTC ISR */
|
|
push [ecx]
|
|
push [ecx+4]
|
|
push ecx
|
|
|
|
/* Now load our new handler */
|
|
mov eax, offset OnlyOnePersonCanWriteHalCode
|
|
mov [ecx], ax
|
|
mov word ptr [ecx+2], KGDT_R0_CODE
|
|
mov word ptr [ecx+4], HEX(08E00)
|
|
shr eax, 16
|
|
mov [ecx+6], ax
|
|
|
|
/* Reset our counter */
|
|
mov dword ptr [ebp-12], 0
|
|
|
|
/* Acquire CMOS lock */
|
|
call _HalpAcquireCmosSpinLock@0
|
|
|
|
/* Now initialize register A on the CMOS */
|
|
mov ax, HEX(2D00) OR CMOS_REGISTER_A
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register B */
|
|
mov ax, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Don't touch the LastKnownGoodConfig hack */
|
|
and al, 1
|
|
mov ah, al
|
|
|
|
/* Enable the interrupt */
|
|
or ah, HEX(42)
|
|
|
|
/* Now write the register B */
|
|
mov al, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register C */
|
|
mov al, CMOS_REGISTER_C
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Read register D */
|
|
mov al, CMOS_REGISTER_D
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Release CMOS lock */
|
|
mov dword ptr [ebp-12], 0
|
|
call _HalpReleaseCmosSpinLock@0
|
|
|
|
/* Initialize looper */
|
|
xor eax, eax
|
|
|
|
/* Align to 16 bytes */
|
|
.align 16
|
|
|
|
/* Enable interrupts! */
|
|
sti
|
|
jmp Looper
|
|
|
|
/* Align to 16 bytes */
|
|
.align 16
|
|
|
|
/* Subtract one count */
|
|
Looper:
|
|
sub eax, 1
|
|
jnz Looper
|
|
|
|
/* ASSERT: If we got here, then the RTC never fired */
|
|
call _DbgBreakPoint@0
|
|
jmp Looper
|
|
|
|
OnlyOnePersonCanWriteHalCode:
|
|
/*********************** THIS IS THE RTC HANDLER **************************/
|
|
|
|
/* Increment the interrupt count and check if this is the first one */
|
|
inc dword ptr [ebp-12]
|
|
cmp dword ptr [ebp-12], 1
|
|
jnz ComputeStall
|
|
|
|
/*
|
|
* It is the first one -- we'll ignore it, since it fires randomly!
|
|
* Get rid of the old return address and push the new one in (our looper)
|
|
*/
|
|
pop eax
|
|
push offset Looper
|
|
|
|
/* Acquire CMOS lock */
|
|
call _HalpAcquireCmosSpinLock@0
|
|
|
|
/* Now initialize register A on the CMOS */
|
|
mov ax, HEX(2D00) OR CMOS_REGISTER_A
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register B */
|
|
mov ax, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Don't touch the LastKnownGoodConfig hack */
|
|
and al, 1
|
|
mov ah, al
|
|
|
|
/* Enable the interrupt */
|
|
or ah, HEX(42)
|
|
|
|
/* Now write the register B */
|
|
mov al, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register C */
|
|
mov al, CMOS_REGISTER_C
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Read register D */
|
|
mov al, CMOS_REGISTER_D
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Release CMOS lock */
|
|
call _HalpReleaseCmosSpinLock@0
|
|
|
|
/* Dismiss the interrupt */
|
|
mov al, PIC_EOI
|
|
out PIC2_COMMAND, al
|
|
mov al, PIC_SPECIFIC_EOI2
|
|
out PIC1_COMMAND, al
|
|
|
|
/* Reset the counter and return back to the looper */
|
|
xor eax, eax
|
|
iretd
|
|
|
|
/******************* THIS IS THE 2ND RTC HANDLER **************************/
|
|
ComputeStall:
|
|
|
|
/* Do the calculation */
|
|
neg eax
|
|
xor edx, edx
|
|
mov ecx, 125000 /* RTC fires every 125 ms */
|
|
div ecx
|
|
|
|
/* Is the remainder 0? */
|
|
cmp edx, 0
|
|
jz FoundFactor
|
|
|
|
/* Otherwise fix-up the loop count */
|
|
inc eax
|
|
|
|
FoundFactor:
|
|
/* Save the stall scale factor */
|
|
mov fs:[KPCR_STALL_SCALE_FACTOR], eax
|
|
|
|
/* Prepare for interrupt return */
|
|
pop eax
|
|
push offset AndItsNotYou
|
|
mov eax, HEX(13)
|
|
|
|
/* Acquire CMOS lock */
|
|
call _HalpAcquireCmosSpinLock@0
|
|
|
|
/* Now initialize register A on the CMOS */
|
|
mov ax, HEX(2D00) OR CMOS_REGISTER_A
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register B */
|
|
mov ax, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Don't touch the LastKnownGoodConfig hack */
|
|
and al, 1
|
|
mov ah, al
|
|
|
|
/* Disable the interrupt */
|
|
or ah, 2
|
|
|
|
/* Now write the register B */
|
|
mov al, CMOS_REGISTER_B
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
mov al, ah
|
|
out CMOS_DATA, al
|
|
jmp $+2
|
|
|
|
/* Read register C */
|
|
mov al, CMOS_REGISTER_C
|
|
out CMOS_ADDR, al
|
|
jmp $+2
|
|
in al, CMOS_DATA
|
|
jmp $+2
|
|
|
|
/* Release CMOS lock */
|
|
call _HalpReleaseCmosSpinLock@0
|
|
|
|
/* Dismiss the interrupt */
|
|
mov al, PIC_EOI
|
|
out PIC2_COMMAND, al
|
|
mov al, PIC_SPECIFIC_EOI2
|
|
out PIC1_COMMAND, al
|
|
|
|
/* Disable interrupts on return */
|
|
and word ptr [esp+8], NOT EFLAGS_INTERRUPT_MASK
|
|
iretd
|
|
|
|
/************************* WE ARE BACK FROM RTC ***************************/
|
|
AndItsNotYou:
|
|
|
|
/* Restore the IDT */
|
|
pop ecx
|
|
pop [ecx+4]
|
|
pop [ecx]
|
|
|
|
/* Restore the mask */
|
|
pop eax
|
|
out PIC1_DATA, al
|
|
shr eax, 8
|
|
out PIC2_DATA, al
|
|
|
|
/* Restore EFLAGS */
|
|
popfd
|
|
|
|
/* Restore stack and return */
|
|
mov esp, ebp
|
|
pop ebp
|
|
ret
|
|
|
|
|
|
#ifndef _MINIHAL_
|
|
PUBLIC _KeStallExecutionProcessor@4
|
|
_KeStallExecutionProcessor@4:
|
|
|
|
/* Get the number of microseconds required */
|
|
mov ecx, [esp+4]
|
|
jecxz Done
|
|
|
|
/* Multiply by the stall factor */
|
|
mov eax, fs:[KPCR_STALL_SCALE_FACTOR]
|
|
mul ecx
|
|
|
|
/* Jump to subtraction loop */
|
|
jmp SubtractLoop
|
|
|
|
/* Align to 16 bytes */
|
|
.align 16
|
|
|
|
/* Subtract one count */
|
|
SubtractLoop:
|
|
sub eax, 1
|
|
jnz SubtractLoop
|
|
|
|
Done:
|
|
/* Return */
|
|
ret 4
|
|
#endif
|
|
|
|
END
|