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## @file
# This is the assembly code for MP/HT (Multiple-processor / Hyper-threading) support
#
# Copyright (c) 1999 - 2015, Intel Corporation. All rights reserved.<BR>
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
##
##include Htequ.inc
.equ VacantFlag , 0x00
.equ NotVacantFlag , 0xff
.equ StartupApSignal , 0x6E750000
.equ MonitorFilterSize, 0x10
.equ ApCounterInit , 0
.equ ApInHltLoop , 1
.equ ApInMwaitLoop , 2
.equ ApInRunLoop , 3
.equ LockLocation , 0x1000 - 0x0400
.equ StackStart , LockLocation + 0x4
.equ StackSize , LockLocation + 0x8
.equ RendezvousProc , LockLocation + 0x0C
.equ GdtrProfile , LockLocation + 0x10
.equ IdtrProfile , LockLocation + 0x16
.equ BufferStart , LockLocation + 0x1C
.equ Cr3Location , LockLocation + 0x20
.equ InitFlag , LockLocation + 0x24
.equ WakeUpApManner , LockLocation + 0x28
.equ BistBuffer , LockLocation + 0x2C
.macro PAUSE32
.byte 0xF3
.byte 0x90
.endm
#-------------------------------------------------------------------------------
# AsmAcquireMPLock (&Lock)
#-------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmAcquireMPLock)
ASM_PFX(AsmAcquireMPLock):
pushal
movl %esp, %ebp
movb $NotVacantFlag, %al
movl 0x24(%ebp), %ebx
TryGetLock:
lock xchgb (%ebx), %al
cmpb $VacantFlag, %al
jz LockObtained
PAUSE32
jmp TryGetLock
LockObtained:
popal
ret
#AsmAcquireMPLock ENDP
#-------------------------------------------------------------------------------
# AsmReleaseMPLock (&Lock)
#-------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmReleaseMPLock)
ASM_PFX(AsmReleaseMPLock):
pushal
movl %esp, %ebp
movb $VacantFlag, %al
movl 0x24(%ebp), %ebx
lock xchgb (%ebx), %al
popal
ret
#AsmReleaseMPLock ENDP
#-------------------------------------------------------------------------------
# AsmGetGdtrIdtr (&Gdt, &Idt)#
#-------------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmGetGdtrIdtr)
ASM_PFX(AsmGetGdtrIdtr):
pushal
movl %esp, %ebp
sgdt GdtDesc
leal GdtDesc, %esi
movl 0x24(%ebp), %edi
movl %esi, (%edi)
sidt IdtDesc
leal IdtDesc, %esi
movl 0x28(%ebp), %edi
movl %esi, (%edi)
popal
ret
#AsmGetGdtrIdtr ENDP
GdtDesc: # GDT descriptor
.word 0x03f # GDT limit
.word 0x0 # GDT base and limit will be
.word 0x0 # filled using sgdt
IdtDesc: # IDT descriptor
.word 0x0 # IDT limit
.word 0x0 # IDT base and limit will be
.word 0x0 # filled using sidt
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