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|
## @file
# Assembly code that supports IA32 CPU architectural protocol.
#
# 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
#
##
.data
ExternalVectorTablePtr: .space 4
CommonInterruptEntry: .long CommonEntry
Idtr: .space 2
Idtr1: .space 4
##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
.text
#---------------------------------------#
# _InitializeIdt #
#----------------------------------------------------------------------------#
#
# Protocol prototype
# InitializeIdt (
# IN EFI_CPU_INTERRUPT_HANDLER TableStart,
# IN UINTN *IdtTablePtr,
# IN UINT16 IdtLimit
# )
#
# Routine Description:
#
# Creates an IDT table starting at IdtTablPtr. It has IdtLimit/8 entries.
# Table is initialized to intxx where xx is from 00 to number of entries or
# 100h, whichever is smaller. After table has been initialized the LIDT
# instruction is invoked.
#
# TableStart is the pointer to the callback table and is not used by
# InitializedIdt but by commonEntry. CommonEntry handles all interrupts,
# does the context save and calls the callback entry, if non-NULL.
# It is the responsibility of the callback routine to do hardware EOIs.
#
# Arguments:
#
# TableStart - Pointer to interrupt callback table
#
# IdtTablePtr - Pointer to IDT table
#
# IdtLimit - IDT Table limit = number of interrupt entries * 8
#
# Returns:
#
# Nothing
#
#
# Input: [ebp][0] = Original ebp
# [ebp][4] = Return address
# [ebp][8] = TableStart
# [ebp][0c] = *IdtTablePtr
# [ebp][10] = IdtLimit
#
# Output: Nothing
#
# Destroys: Nothing
#-----------------------------------------------------------------------------#
ASM_GLOBAL ASM_PFX(InitializeIdt)
ASM_PFX(InitializeIdt):
pushl %ebp # C prolog
movl %esp,%ebp
pushl %edi
movl 8(%ebp),%eax # Get ExternalVectorTable Address
movl %eax, ExternalVectorTablePtr
movw 0x10(%ebp),%ax # Get IDT Table limit
decw %ax
movw %ax, Idtr # Store %ax to Idtr
movl 0xc(%ebp),%eax # Get Start of IDT
movl %eax, Idtr1
movl $Idtr, %edi # Addr of Idtr -> %edi
lidt %es:(%edi)
popl %edi
popl %ebp
ret
#----------------------------------------------------------------------------#
#
# Protocol prototype
# None
#
# Routine Description:
#
# These routines handle the individual interrupts. These routines always
# gain control on any interrupt or exception. They save EAX and place
# the interrupt number in EAX. CommonEntry is then jumped to.
# instruction is invoked.
#
# CommonEntry handles all interrupts,does the context save and calls the
# callback entry, if non-NULL. It is the responsibility of the callback
# routine to do hardware EOIs. Callbacks are entered into the table
# located at TableStart. Entries are modified by the InstallInterruptHandler
# and UninstallInterruptHandler protocols.
#
# Arguments to CommonEntry:
#
# EAX - Interrupt or exception number
#
# TableStart - Pointer to interrupt callback table
#
# Returns:
#
# Nothing
#
#
# Output: Nothing
#
# Destroys: Nothing
#-----------------------------------------------------------------------------#
TemplateStart:
pushl %eax
#mov eax, 0nnh (nn stands for vector number, which will be fixed at runtime
.byte 0xb8
VectorNumber:
.long 0x0
jmp *CommonInterruptEntry
TemplateEnd:
CommonEntry:
#---------------------------------------#
# _CommonEntry #
#----------------------------------------------------------------------------#
# The follow algorithm is used for the common interrupt routine.
# Entry from each interrupt with a push eax and eax=interrupt number
#
# +---------------------+
# + EFlags +
# +---------------------+
# + CS +
# +---------------------+
# + EIP +
# +---------------------+
# + Error Code +
# +---------------------+
# + EAX / Vector Number +
# +---------------------+
# + EBP +
# +---------------------+ <-- EBP
#
cli
#
# All interrupt handlers are invoked through interrupt gates, so
# IF flag automatically cleared at the entry point
#
cmpl $32,%eax # Intel reserved vector for exceptions?
jae NoErrorCode
btl %eax, %cs:ASM_PFX(mErrorCodeFlag)
jc L1
NoErrorCode:
#
# Push a dummy error code on the stack
# to maintain coherent stack map
#
pushl (%esp) # Push the value %esp pointing to
movl $0, 4(%esp)
L1:
pushl %ebp
movl %esp,%ebp
#
# Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
# is 16-byte aligned
#
andl $0xfffffff0,%esp
subl $12,%esp
## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax#
pushl 0x4(%ebp)
pushl %ecx
pushl %edx
pushl %ebx
leal 24(%ebp),%ecx
pushl %ecx # ESP
pushl (%ebp)
pushl %esi
pushl %edi
movl %eax,4(%ebp) # save vector number
## UINT32 Gs, Fs, Es, Ds, Cs, Ss#
movl %ss,%eax
pushl %eax
movzwl 16(%ebp), %eax
pushl %eax
movl %ds,%eax
pushl %eax
movl %es,%eax
pushl %eax
movl %fs,%eax
pushl %eax
movl %gs,%eax
pushl %eax
## UINT32 Eip#
pushl 12(%ebp)
## UINT32 Gdtr[2], Idtr[2]#
subl $8,%esp
sidt (%esp)
subl $8,%esp
sgdt (%esp)
## UINT32 Ldtr, Tr#
xorl %eax,%eax
strl %eax
pushl %eax
sldtl %eax
pushl %eax
## UINT32 EFlags#
pushl 20(%ebp)
## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4#
movl %cr4, %eax
orl $0x208,%eax
movl %eax, %cr4
pushl %eax
movl %cr3, %eax
pushl %eax
movl %cr2, %eax
pushl %eax
xorl %eax,%eax
pushl %eax
movl %cr0, %eax
pushl %eax
## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
movl %dr7, %eax
pushl %eax
## clear Dr7 while executing debugger itself
xorl %eax, %eax
movl %eax, %dr7
movl %dr6, %eax
pushl %eax
## insure all status bits in dr6 are clear...
xorl %eax, %eax
movl %eax, %dr6
movl %dr3, %eax
pushl %eax
movl %dr2, %eax
pushl %eax
movl %dr1, %eax
pushl %eax
movl %dr0, %eax
pushl %eax
## FX_SAVE_STATE_IA32 FxSaveState#
subl $512, %esp
movl %esp, %edi
.byte 0x0f, 0xae, 0x07
## UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear
cld
## UINT32 ExceptionData#
pushl 8(%ebp)
## call into exception handler
movl 4(%ebp), %ebx
movl ExternalVectorTablePtr, %eax
movl (%eax,%ebx,4), %eax
orl %eax, %eax # NULL?
je nonNullValue #
## Prepare parameter and call
movl %esp, %edx
pushl %edx
pushl %ebx
call *%eax
addl $8, %esp
nonNullValue:
cli
## UINT32 ExceptionData#
addl $4,%esp
## FX_SAVE_STATE_IA32 FxSaveState#
movl %esp, %esi
.byte 0x0f, 0xae, 0x0e
addl $512, %esp
## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
popl %eax
movl %eax, %dr0
popl %eax
movl %eax, %dr1
popl %eax
movl %eax, %dr2
popl %eax
movl %eax, %dr3
## skip restore of dr6. We cleared dr6 during the context save.
addl $4, %esp
popl %eax
movl %eax, %dr7
## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4#
popl %eax
movl %eax, %cr0
addl $4,%esp # not for Cr1
popl %eax
movl %eax, %cr2
popl %eax
movl %eax, %cr3
popl %eax
movl %eax, %cr4
## UINT32 EFlags#
popl 20(%ebp)
## UINT32 Ldtr, Tr#
## UINT32 Gdtr[2], Idtr[2]#
## Best not let anyone mess with these particular registers...
addl $24,%esp
## UINT32 Eip#
pop 12(%ebp)
## UINT32 Gs, Fs, Es, Ds, Cs, Ss#
## NOTE - modified segment registers could hang the debugger... We
## could attempt to insulate ourselves against this possibility,
## but that poses risks as well.
##
popl %gs
popl %fs
popl %es
popl %ds
popl 16(%ebp)
popl %ss
## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax#
popl %edi
popl %esi
addl $4, %esp # not for ebp
addl $4, %esp # not for esp
popl %ebx
popl %edx
popl %ecx
popl %eax
movl %ebp, %esp
popl %ebp
addl $8,%esp
iretl
#---------------------------------------#
# _GetTemplateAddressMap #
#----------------------------------------------------------------------------#
#
# Protocol prototype
# GetTemplateAddressMap (
# INTERRUPT_HANDLER_TEMPLATE_MAP *AddressMap
# )#
#
# Routine Description:
#
# Return address map of interrupt handler template so that C code can generate
# interrupt handlers, and dynamically do address fix.
#
# Arguments:
#
#
# Returns:
#
# Nothing
#
#
# Input: [ebp][0] = Original ebp
# [ebp][4] = Return address
#
# Output: Nothing
#
# Destroys: Nothing
#-----------------------------------------------------------------------------#
ASM_GLOBAL ASM_PFX(GetTemplateAddressMap)
ASM_PFX(GetTemplateAddressMap):
pushl %ebp # C prolog
movl %esp,%ebp
pushal
movl 8(%ebp), %ebx
movl $TemplateStart, (%ebx)
movl $(TemplateEnd - TemplateStart), 4(%ebx)
# Note: if code in Template is updated, the value fills into the 3rd parameter
# also needs update
movl $(VectorNumber - TemplateStart), 8(%ebx)
popal
popl %ebp
ret
#---------------------------------------#
# _InitializeSelectors #
#----------------------------------------------------------------------------#
#
# Protocol prototype
# InitializeSelectors (
# )
#
# Routine Description:
#
# Creates an new GDT in RAM. The problem is that our former selectors
# were ROM based and the EFI OS Loader does not manipulate the machine state
# to change them (as it would for a 16-bit PC/AT startup code that had to
# go from Real Mode to flat mode).
#
# Arguments:
#
#
# Returns:
#
# Nothing
#
#
# Input: [ebp][0] = Original ebp
# [ebp][4] = Return address
#
# Output: Nothing
#
# Destroys: Nothing
#-----------------------------------------------------------------------------#
.equ CODE_SELECTOR, 0x10
.equ DATA_SELECTOR, 0x18
ASM_GLOBAL ASM_PFX(InitializeSelectors)
ASM_PFX(InitializeSelectors):
pushl %ebp # C prolog
movl %esp,%ebp
pushal
movl $Gdtr, %edi
movw %cs,%ax # Get the selector data from our code image
.byte 0x66
movw %ax,%es
lgdt %es:(%edi)
.byte 0x67
.byte 0xea # Far Jump Offset:Selector to reload CS
.long SelectorRld
.word CODE_SELECTOR
SelectorRld:
movw $DATA_SELECTOR, %ax # Update the Base for the new selectors, too
.byte 0x66
movw %ax,%ds
.byte 0x66
movw %ax,%es
.byte 0x66
movw %ax,%fs
.byte 0x66
movw %ax,%gs
.byte 0x66
movw %ax,%ss
popal
popl %ebp
ret
#------------------------------------------------------------------------------
# VOID
# CpuEnableInterrupt (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(CpuEnableInterrupt)
ASM_PFX(CpuEnableInterrupt):
sti
ret
#CpuEnableInterrupt ENDP
#------------------------------------------------------------------------------
# VOID
# CpuDisableInterrupt (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(CpuDisableInterrupt)
ASM_PFX(CpuDisableInterrupt):
cli
ret
#CpuDisableInterrupt ENDP
#------------------------------------------------------------------------------
# VOID
# CpuInitFloatPointUnit (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(CpuInitFloatPointUnit)
ASM_PFX(CpuInitFloatPointUnit):
finit
ret
#CpuInitFloatPointUnit ENDP
#------------------------------------------------------------------------------
# UINT16
# GetCodeSegment (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(GetCodeSegment)
ASM_PFX(GetCodeSegment):
movw %cs, %ax
ret
#GetCodeSegment ENDP
#------------------------------------------------------------------------------
# VOID
# EfiWbinvd (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(EfiWbinvd)
ASM_PFX(EfiWbinvd):
wbinvd
ret
#EfiWbinvd ENDP
#------------------------------------------------------------------------------
# VOID
# EfiInvd (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(EfiInvd)
ASM_PFX(EfiInvd):
invd
ret
#EfiInvd ENDP
#------------------------------------------------------------------------------
# VOID
# GetIdt (
# IDT_INFORMATION *IdtInfo
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(GetIdt)
ASM_PFX(GetIdt):
push %ebp # C prolog
movl %esp, %ebp
movl 8(%ebp), %eax
sidt (%eax)
popl %ebp
ret
#GetIdt ENDP
#------------------------------------------------------------------------------
# VOID
# C1eExceptionHandler (
# VOID
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(C1eExceptionHandler)
ASM_PFX(C1eExceptionHandler):
pushl %ebp # C prolog
movl %esp, %ebp
pushfl
cli
pushal
# Verify if GPE was caused by C1e write.
# If not, pass control to real exception handler.
cmp $0, ASM_PFX(mWroteMsr)
je notourexception
# Fix the return address on stack to skip offending
# code which caused the exception.
movl 8(%ebp), %eax
addl $2, %eax
movl %eax, 8(%ebp)
jmp exit
notourexception:
popal
popfl
popl %ebp
jmp ASM_PFX(mOriginalInt13)
exit:
popal
popfl
popl %ebp
addl $4, %esp
iretl
#C1eExceptionHandler ENDP
ASM_GLOBAL ASM_PFX(GetCoreNumber)
ASM_PFX(GetCoreNumber):
pushl %ebx
movl $4, %eax
movl $0, %ecx
cpuid
shrl $26, %eax
andl $0x3f, %eax
incb %al
popl %ebx
ret
#GetCoreNumber ENDP
#-----------------------------------------------------------------------------#
# data
#-----------------------------------------------------------------------------#
.p2align 4
Gdtr: .word GDT_END - GDT_BASE - 1
.long GDT_BASE
#-----------------------------------------------------------------------------#
# global descriptor table (GDT)
#-----------------------------------------------------------------------------#
.p2align 4
GDT_BASE:
# null descriptor
# .equ NULL_SEL, $-GDT_BASE # Selector [0]
.word 0 # limit 15:0
.word 0 # base 15:0
.byte 0 # base 23:16
.byte 0 # type
.byte 0 # limit 19:16, flags
.byte 0 # base 31:24
# linear data segment descriptor
# .equ LINEAR_SEL, $-GDT_BASE # Selector [0x8]
.word 0xFFFF # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0x92 # present, ring 0, data, expand-up, writable
.byte 0xCF # page-granular, 32-bit
.byte 0
# linear code segment descriptor
# .equ LINEAR_CODE_SEL, $-GDT_BASE # Selector [0x10]
.word 0xFFFF # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0x9A # present, ring 0, data, expand-up, writable
.byte 0xCF # page-granular, 32-bit
.byte 0
# system data segment descriptor
# .equ SYS_DATA_SEL, $-GDT_BASE # Selector [0x18]
.word 0xFFFF # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0x92 # present, ring 0, data, expand-up, writable
.byte 0xCF # page-granular, 32-bit
.byte 0
# system code segment descriptor
# .equ SYS_CODE_SEL, $-GDT_BASE
.word 0xFFFF # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0x9A # present, ring 0, data, expand-up, writable
.byte 0xCF # page-granular, 32-bit
.byte 0
# spare segment descriptor
# .equ SPARE3_SEL, $-GDT_BASE
.word 0 # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0 # present, ring 0, data, expand-up, writable
.byte 0 # page-granular, 32-bit
.byte 0
# spare segment descriptor
# .equ SPARE4_SEL, $-GDT_BASE
.word 0 # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0 # present, ring 0, data, expand-up, writable
.byte 0 # page-granular, 32-bit
.byte 0
# spare segment descriptor
# .equ SPARE5_SEL, $-GDT_BASE
.word 0 # limit 0xFFFFF
.word 0 # base 0
.byte 0
.byte 0 # present, ring 0, data, expand-up, writable
.byte 0 # page-granular, 32-bit
.byte 0
GDT_END:
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