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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.
;;
page ,132
title CPU ARCHITECTURAL DXE PROTOCOL ASSEMBLY HOOKS
.686p
.model flat
.data
ExternalVectorTablePtr DD ? ; Table of call backs
CommonInterruptEntry DD CommonEntry ; Address of CommonEntry
Idtr DW ? ; FWORD for IDT register
Idtr1 DD ? ; MUST BE IMMEDIATELY AFTER Idtr
EXTRN _mErrorCodeFlag:DWORD ; Error code flags for exceptions
.stack
.code
.MMX
.XMM
include Htequ.inc
UINT8 TYPEDEF BYTE
UINT16 TYPEDEF WORD
UINT32 TYPEDEF DWORD
UINT64 TYPEDEF QWORD
UINTN TYPEDEF UINT32
;---------------------------------------;
; _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
;-----------------------------------------------------------------------------;
_InitializeIdt proc near public
push ebp ; C prolog
mov ebp, esp
push edi
mov eax, [ebp+8] ; Get ExternalVectorTable Address
mov ExternalVectorTablePtr, eax
mov ax, [ebp+10h] ; Get IDT Table limit
dec ax
mov Idtr, ax
mov eax, [ebp+0ch] ; Get Start of IDT
mov Idtr1, eax
mov edi, OFFSET Idtr ; Load IDT register
lidt FWORD PTR es:[edi]
pop edi
pop ebp
ret
_InitializeIdt endp
;----------------------------------------------------------------------------;
;
; 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:
push eax
;mov eax, 0nnh (nn stands for vector number, which will be fixed at runtime
DB 0b8h
VectorNumber:
DD 00h
jmp dword ptr [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
;
cmp eax, 32 ; Intel reserved vector for exceptions?
jae NoErrorCode
bt cs:_mErrorCodeFlag, eax
jc @F
NoErrorCode:
;
; Push a dummy error code on the stack
; to maintain coherent stack map
;
push [esp]
mov dword ptr [esp + 4], 0
@@:
push ebp
mov ebp, esp
;
; Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
; is 16-byte aligned
;
and esp, 0fffffff0h
sub esp, 12
;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
push dword ptr [ebp + 4] ; EAX
push ecx
push edx
push ebx
lea ecx, [ebp + 24]
push ecx ; ESP
push dword ptr [ebp] ; EBP
push esi
push edi
mov [ebp + 4], eax ; save vector number
;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;
mov eax, ss
push eax
movzx eax, word ptr [ebp + 16]
push eax
mov eax, ds
push eax
mov eax, es
push eax
mov eax, fs
push eax
mov eax, gs
push eax
;; UINT32 Eip;
push dword ptr [ebp + 12]
;; UINT32 Gdtr[2], Idtr[2];
sub esp, 8
sidt fword ptr [esp]
sub esp, 8
sgdt fword ptr [esp]
;; UINT32 Ldtr, Tr;
xor eax, eax
str ax
push eax
sldt ax
push eax
;; UINT32 EFlags;
push dword ptr [ebp + 20]
;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
mov eax, cr4
or eax, 208h
mov cr4, eax
push eax
mov eax, cr3
push eax
mov eax, cr2
push eax
xor eax, eax
push eax
mov eax, cr0
push eax
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
mov eax, dr7
push eax
;; clear Dr7 while executing debugger itself
xor eax, eax
mov dr7, eax
mov eax, dr6
push eax
;; insure all status bits in dr6 are clear...
xor eax, eax
mov dr6, eax
mov eax, dr3
push eax
mov eax, dr2
push eax
mov eax, dr1
push eax
mov eax, dr0
push eax
;; FX_SAVE_STATE_IA32 FxSaveState;
sub esp, 512
mov edi, esp
db 0fh, 0aeh, 00000111y ;fxsave [edi]
;; UINT32 ExceptionData;
push dword ptr [ebp + 8]
;; call into exception handler
mov ebx, [ebp + 4]
mov eax, ExternalVectorTablePtr
mov eax, [eax + ebx * 4]
or eax, eax ; NULL?
je nonNullValue;
;; Prepare parameter and call
mov edx, esp
push edx
push ebx
call eax
add esp, 8
nonNullValue:
cli
;; UINT32 ExceptionData;
add esp, 4
;; FX_SAVE_STATE_IA32 FxSaveState;
mov esi, esp
db 0fh, 0aeh, 00001110y ; fxrstor [esi]
add esp, 512
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
pop eax
mov dr0, eax
pop eax
mov dr1, eax
pop eax
mov dr2, eax
pop eax
mov dr3, eax
;; skip restore of dr6. We cleared dr6 during the context save.
add esp, 4
pop eax
mov dr7, eax
;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
pop eax
mov cr0, eax
add esp, 4 ; not for Cr1
pop eax
mov cr2, eax
pop eax
mov cr3, eax
pop eax
mov cr4, eax
;; UINT32 EFlags;
pop dword ptr [ebp + 20]
;; UINT32 Ldtr, Tr;
;; UINT32 Gdtr[2], Idtr[2];
;; Best not let anyone mess with these particular registers...
add esp, 24
;; UINT32 Eip;
pop dword ptr [ebp + 12]
;; 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.
;;
pop gs
pop fs
pop es
pop ds
pop dword ptr [ebp + 16]
pop ss
;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
pop edi
pop esi
add esp, 4 ; not for ebp
add esp, 4 ; not for esp
pop ebx
pop edx
pop ecx
pop eax
mov esp, ebp
pop ebp
add esp, 8
iretd
;---------------------------------------;
; _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
;-----------------------------------------------------------------------------;
_GetTemplateAddressMap proc near public
push ebp ; C prolog
mov ebp, esp
pushad
mov ebx, dword ptr [ebp+08h]
mov dword ptr [ebx], TemplateStart
mov dword ptr [ebx+4h], TemplateEnd - TemplateStart
; if code in Template is updated, the value fills into the 3rd parameter
; also needs update
mov dword ptr [ebx+8h], VectorNumber - TemplateStart
popad
pop ebp
ret
_GetTemplateAddressMap endp
;---------------------------------------;
; _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
;-----------------------------------------------------------------------------;
CODE_SELECTOR EQU 10h
DATA_SELECTOR EQU 18h
_InitializeSelectors proc near public
push ebp ; C prolog
mov ebp, esp
pushad
mov edi, OFFSET Gdtr ; Load GDT register
mov ax,cs ; Get the selector data from our code image
mov es,ax
lgdt FWORD PTR es:[edi] ; and update the GDTR
db 067h
db 0eah ; Far Jump Offset:Selector to reload CS
dd OFFSET SelectorRld; Offset is ensuing instruction boundary
dw CODE_SELECTOR ; Selector is our code selector, 10h
SelectorRld::
mov ax, DATA_SELECTOR ; Update the Base for the new selectors, too
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
popad
pop ebp
ret
_InitializeSelectors endp
;------------------------------------------------------------------------------
; VOID
; CpuEnableInterrupt (
; VOID
; )
;------------------------------------------------------------------------------
CpuEnableInterrupt PROC C PUBLIC
sti
ret
CpuEnableInterrupt ENDP
;------------------------------------------------------------------------------
; VOID
; CpuDisableInterrupt (
; VOID
; )
;------------------------------------------------------------------------------
CpuDisableInterrupt PROC C PUBLIC
cli
ret
CpuDisableInterrupt ENDP
;------------------------------------------------------------------------------
; VOID
; CpuInitFloatPointUnit (
; VOID
; )
;------------------------------------------------------------------------------
CpuInitFloatPointUnit PROC C PUBLIC
finit
ret
CpuInitFloatPointUnit ENDP
;------------------------------------------------------------------------------
; UINT16
; GetCodeSegment (
; VOID
; )
;------------------------------------------------------------------------------
GetCodeSegment PROC C PUBLIC
mov ax,cs
ret
GetCodeSegment ENDP
;------------------------------------------------------------------------------
; VOID
; EfiWbinvd (
; VOID
; )
;------------------------------------------------------------------------------
EfiWbinvd PROC PUBLIC
wbinvd
ret
EfiWbinvd ENDP
;------------------------------------------------------------------------------
; VOID
; EfiInvd (
; VOID
; )
;------------------------------------------------------------------------------
EfiInvd PROC PUBLIC
invd
ret
EfiInvd ENDP
;------------------------------------------------------------------------------
; VOID
; GetIdt (
; IDT_INFORMATION *IdtInfo
; )
;------------------------------------------------------------------------------
_GetIdt proc near public
push ebp ; C prolog
mov ebp, esp
mov eax, [ebp+8]
sidt FWORD PTR [eax]
pop ebp
ret
_GetIdt ENDP
GetCoreNumber PROC C PUBLIC
push ebx
mov eax, 4
mov ecx, 0
cpuid
shr eax, 26
and eax, 3fh
inc al
pop ebx
ret
GetCoreNumber ENDP
;-----------------------------------------------------------------------------;
; data
;-----------------------------------------------------------------------------;
align 16
gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit
dd OFFSET GDT_BASE ; (GDT base gets set above)
;-----------------------------------------------------------------------------;
; global descriptor table (GDT)
;-----------------------------------------------------------------------------;
align 16
public GDT_BASE
GDT_BASE:
; null descriptor
NULL_SEL equ $-GDT_BASE ; Selector [0]
dw 0 ; limit 15:0
dw 0 ; base 15:0
db 0 ; base 23:16
db 0 ; type
db 0 ; limit 19:16, flags
db 0 ; base 31:24
; linear data segment descriptor
LINEAR_SEL equ $-GDT_BASE ; Selector [0x8]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 092h ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; linear code segment descriptor
LINEAR_CODE_SEL equ $-GDT_BASE ; Selector [0x10]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 09Ah ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; system data segment descriptor
SYS_DATA_SEL equ $-GDT_BASE ; Selector [0x18]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 092h ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; system code segment descriptor
SYS_CODE_SEL equ $-GDT_BASE
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 09Ah ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; spare segment descriptor
SPARE3_SEL equ $-GDT_BASE
dw 0 ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 0 ; present, ring 0, data, expand-up, writable
db 0 ; page-granular, 32-bit
db 0
; spare segment descriptor
SPARE4_SEL equ $-GDT_BASE
dw 0 ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 0 ; present, ring 0, data, expand-up, writable
db 0 ; page-granular, 32-bit
db 0
; spare segment descriptor
SPARE5_SEL equ $-GDT_BASE
dw 0 ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 0 ; present, ring 0, data, expand-up, writable
db 0 ; page-granular, 32-bit
db 0
GDT_END:
end
|