diff options
Diffstat (limited to 'OldMdePkg/Library/BaseLib/Ia32/Thunk16.S')
| -rw-r--r-- | OldMdePkg/Library/BaseLib/Ia32/Thunk16.S | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ia32/Thunk16.S b/OldMdePkg/Library/BaseLib/Ia32/Thunk16.S deleted file mode 100644 index c45cdb0a2d..0000000000 --- a/OldMdePkg/Library/BaseLib/Ia32/Thunk16.S +++ /dev/null @@ -1,200 +0,0 @@ -#------------------------------------------------------------------------------
-#
-# Copyright (c) 2006, Intel Corporation
-# All rights reserved. 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.
-#
-# Module Name:
-#
-# Thunk16.S
-#
-# Abstract:
-#
-# Real mode thunk
-#
-#------------------------------------------------------------------------------
-
-.globl ASM_PFX(m16Start), ASM_PFX(m16Size), ASM_PFX(mThunk16Attr), ASM_PFX(m16Gdt), ASM_PFX(m16GdtrBase), ASM_PFX(mTransition)
-.globl ASM_PFX(InternalAsmThunk16)
-
-ASM_PFX(m16Start):
-
-SavedGdt: .space 6
-
-ASM_PFX(BackFromUserCode):
- push %ss
- push %cs
- .byte 0x66
- call L_Base1 # push eip
-L_Base1:
- pushfw # pushfd actually
- cli # disable interrupts
- push %gs
- push %fs
- push %es
- push %ds
- pushaw # pushad actually
- .byte 0x66, 0xba # mov edx, imm32
-ASM_PFX(ThunkAttr): .space 4
- testb $THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15, %dl
- jz 1f
- movl $0x15cd2401, %eax # mov ax, 2401h & int 15h
- cli # disable interrupts
- jnc 2f
-1:
- testb $THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL, %dl
- jz 2f
- inb $0x92, %al
- orb $2, %al
- outb %al, $0x92 # deactivate A20M#
-2:
- movl %ss, %eax
- .byte 0x67, 0x66, 0x8d, 0x6c, 0x24, 0x34, 0x66
- mov %ebp, 0xffffffd8(%esi)
- mov 0xfffffff8(%esi), %ebx
- shlw $4, %ax # shl eax, 4
- addw %ax, %bp # add ebp, eax
- .byte 0x66, 0xb8 # mov eax, imm32
-SavedCr4: .space 4
- movl %eax, %cr4
- lgdtw %cs:0xfffffff2(%edi)
- .byte 0x66, 0xb8 # mov eax, imm32
-SavedCr0: .space 4
- movl %eax, %cr0
- .byte 0xb8 # mov ax, imm16
-SavedSs: .space 2
- movl %eax, %ss
- .byte 0x66, 0xbc # mov esp, imm32
-SavedEsp: .space 4
- .byte 0x66
- lret # return to protected mode
-
-_EntryPoint: .long ASM_PFX(ToUserCode) - ASM_PFX(m16Start)
- .word 0x8
-_16Idtr: .word 0x3ff
- .long 0
-_16Gdtr: .word GdtEnd - _NullSegDesc - 1
-_16GdtrBase: .long _NullSegDesc
-
-ASM_PFX(ToUserCode):
- movl %ss, %edx
- movl %ecx, %ss # set new segment selectors
- movl %ecx, %ds
- movl %ecx, %es
- movl %ecx, %fs
- movl %ecx, %gs
- movl %eax, %cr0
- movl %ebp, %cr4 # real mode starts at next instruction
- movl %esi, %ss # set up 16-bit stack segment
- xchgw %bx, %sp # set up 16-bit stack pointer
- .byte 0x66
- call L_Base # push eip
-L_Base:
- popw %bp # ebp <- offset L_Base
- addr16 pushl 36(%si)
- .byte 0x36
- lea 0xc(%esi), %eax
- push %eax
- lret
-
-L_RealMode:
- mov %edx, %cs:0xffffffc5(%esi)
- mov %bx, %cs:0xffffffcb(%esi)
- lidtw %cs:0xffffffd7(%esi)
- popaw # popad actually
- pop %ds
- pop %es
- pop %fs
- pop %gs
- popfw # popfd
- lretw # transfer control to user code
-
-_NullSegDesc: .quad 0
-_16CsDesc:
- .word -1
- .word 0
- .byte 0
- .byte 0x9b
- .byte 0x8f # 16-bit segment, 4GB limit
- .byte 0
-_16DsDesc:
- .word -1
- .word 0
- .byte 0
- .byte 0x93
- .byte 0x8f # 16-bit segment, 4GB limit
- .byte 0
-GdtEnd:
-
-#
-# @param RegSet Pointer to a IA32_DWORD_REGS structure
-# @param Transition Pointer to the transition code
-# @return The address of the 16-bit stack after returning from user code
-#
-ASM_PFX(InternalAsmThunk16):
- push %ebp
- push %ebx
- push %esi
- push %edi
- push %ds
- push %es
- push %fs
- push %gs
- movl 36(%esp), %esi # esi <- RegSet
- movzwl 0x32(%esi), %edx
- mov 0xc(%esi), %edi
- add $0xffffffc8, %edi
- movl %edi, %ebx # ebx <- stack offset
- imul $0x10, %edx, %eax
- push $0xd
- addl %eax, %edi # edi <- linear address of 16-bit stack
- pop %ecx
- rep
- movsl # copy RegSet
- movl 40(%esp), %eax # eax <- address of transition code
- movl %edx, %esi # esi <- 16-bit stack segment
- lea 0x5e(%eax), %edx
- movl %eax, %ecx
- andl $0xf, %ecx
- shll $12, %eax
- lea 0x6(%ecx), %ecx
- movw %cx, %ax
- stosl # [edi] <- return address of user code
- sgdtl 0xffffffa2(%edx)
- sidtl 0x24(%esp)
- movl %cr0, %eax
- movl %eax, (%edx) # save CR0 in SavedCr0
- andl $0x7ffffffe, %eax # clear PE, PG bits
- movl %cr4, %ebp
- mov %ebp, 0xfffffff1(%edx)
- andl $0x300, %ebp # clear all but PCE and OSFXSR bits
- pushl $0x10
- pop %ecx # ecx <- selector for data segments
- lgdtl 0x20(%edx)
- pushfl
- lcall *0x14(%edx)
- popfl
- lidtl 0x24(%esp)
- lea 0xffffffcc(%ebp), %eax
- pop %gs
- pop %fs
- pop %es
- pop %ds
- pop %edi
- pop %esi
- pop %ebx
- pop %ebp
- ret
-
- .const:
-
-ASM_PFX(m16Size): .word _InternalAsmThunk16 - ASM_PFX(m16Start)
-ASM_PFX(mThunk16Attr): .word _ThunkAttr - ASM_PFX(m16Start)
-ASM_PFX(m16Gdt): .word _NullSegDesc - ASM_PFX(m16Start)
-ASM_PFX(m16GdtrBase): .word _16GdtrBase - ASM_PFX(m16Start)
-ASM_PFX(mTransition): .word _EntryPoint - ASM_PFX(m16Start)
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