-#*****************************************************************************
-#*
-#* Copyright (c) 2006 - 2007, 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:
-#*
-#* Thunk.asm
-#*
-#* Abstract:
-#*
-#* Real mode thunk
-#*
-#*****************************************************************************
-#include <EfiBind.h>
-
- .686p:
-
-.globl ASM_PFX(mCode16Size)
-
-.data
-mCode16Size: .long _TEXT16SIZE
-
-.data
-
-NullSegSel: .quad 0
-_16BitCsSel:
- .word -1
- .word 0
- .byte 0
- .byte 0x9b
- .byte 0x8f # 16-bit segment
- .byte 0
-_16BitSsSel:
- .word -1
- .word 0
- .byte 0
- .byte 0x93
- .byte 0x8f # 16-bit segment
- .byte 0
-
-_16Gdtr:
- .word _16Gdtr - NullSegSel - 1
- .long NullSegSel
-
-
-.text
-.align 16
-
-
-ASM_PFX(Thunk16):
- push %ebp
- push %ebx
- push %esi
- push %edi
- push %ds
- push %es
- push %fs
- push %gs
- mov 0x24(%esp),%esi
- movzwl 0x32(%esi),%edx
- mov 0xc(%esi),%edi
- add $0xffffffb0,%edi
- push %edi #; save stack offset
- imul $0x10,%edx,%eax #; eax <- edx*16
- add %eax,%edi #; edi <- linear address of 16-bit stack
- push $0xd
- pop %ecx
- rep movsl %ds:(%esi),%es:(%edi) #; copy context to 16-bit stack
- pop %ebx #; ebx <- 16-bit stack offset
- mov $L_Label1,%eax
- stos %eax,%es:(%edi)
- movl %cs,%eax
- stos %ax,%es:(%edi)
- mov 0x28(%esp),%eax
- stos %ax,%es:(%edi)
- mov %esp,%eax
- stos %eax,%es:(%edi)
- movl %ss,%eax
- stos %ax,%es:(%edi)
- sgdtl (%edi)
- sidtl 0x24(%esp)
- mov %cr0,%esi
- mov %esi,0x6(%edi) #; save CR0
- and $0x7ffffffe,%esi #; esi <- CR0 to set
- mov %cr4,%eax
- mov %eax,0xa(%edi) #; save CR4
- and $0xcf,%al #; clear PAE & PSE
- mov %edx,%edi #; edi <- 16-bit stack segment
- mov 0x2c(%esp),%edx
- shl $0x10,%edx
- push %edx
- pop %edx
- mov $(_16BitSsSel - NullSegSel),%dx
- lgdtl _16Gdtr #bugbug mismatch.
- .byte 0xea
- .long L_16Bit #bugbug mismatch.
- .word _16BitCsSel - NullSegSel
-L_16Bit:
- .byte 0x66
- movw %dx,%ss
- mov %esi,%cr0
- mov %eax,%cr4
- .byte 0x67
- .byte 0xff
- .byte 0x6c
- .byte 0x24
- .byte 0xfc
-
-L_Lable1:
- movl %ss,%eax
- shl $0x4,%eax
- add %esp,%eax
- lss 0x3c(%esp),%esp
- lidtl 0x24(%esp)
- pop %gs
- pop %fs
- pop %es
- pop %ds
- pop %edi
- pop %esi
- pop %ebx
- pop %ebp
- ret
-
-.code16
-_Code16Addr:
-ASM_PFX(RealMode):
- movw %di, %ss # set up stack
- movl %ebx, %esp
- lidt %cs:_16Idtr - _Code16Addr #lidt fword ptr cs:[_16Idtr - _Code16Addr]
- .byte 0x66
- popaw
- popw %ds
- popw %es
- popw %fs
- popw %gs
- addw $4, %sp # skip EFlags
- testw $1, 14(%esp) #(_STK16 ptr [esp + 8]).ThunkFlags, 1
- jz 1f
- pushf
-1:
- pushw %cs
-# push @FarCallRet - _Code16Addr
- .byte 0x68 # push /iw
- .word FarCallRet - _Code16Addr
- jz 2f
- ljmp *6(%esp) #bugbug
-2:
- ljmp *4(%esp) #bugbug
-FarCallRet:
- pushfl
- pushw %gs
- pushw %fs
- pushw %es
- pushw %ds
- pushal
- cli
- .byte 0x66 # sizeof (IA32_REGS) = 13 * 4 = 52
- lgdt 66(%esp) #lgdt (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedGdtr
- mov 76(%esp), %eax
- movl %eax, %cr4
- mov 72(%esp), %eax
- movl %eax, %cr0 # restore CR0
- ljmpl *52(%esp)
-#RealMode ENDP
-
-.text
-_16Idtr:
- .word 0x3ff #_16Idtr FWORD (1 SHL 10) - 1
- .byte 0x00
-
-_TEXT16END:
-
-_TEXT16SIZE = _TEXT16END - _Code16Addr
-
-
+#*****************************************************************************\r
+#*\r
+#* Copyright (c) 2006 - 2007, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials \r
+#* are licensed and made available under the terms and conditions of the BSD License \r
+#* which accompanies this distribution. The full text of the license may be found at \r
+#* http://opensource.org/licenses/bsd-license.php \r
+#* \r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+#* \r
+#* Module Name:\r
+#*\r
+#* Thunk.asm\r
+#* \r
+#* Abstract:\r
+#* \r
+#* Real mode thunk\r
+#* \r
+#*****************************************************************************\r
+#include <EfiBind.h>\r
+\r
+ .686p: \r
+\r
+.globl ASM_PFX(mCode16Size)\r
+\r
+.data\r
+mCode16Size: .long _TEXT16SIZE\r
+\r
+.data\r
+\r
+NullSegSel: .quad 0\r
+_16BitCsSel: \r
+ .word -1\r
+ .word 0\r
+ .byte 0\r
+ .byte 0x9b\r
+ .byte 0x8f # 16-bit segment\r
+ .byte 0\r
+_16BitSsSel:\r
+ .word -1\r
+ .word 0\r
+ .byte 0\r
+ .byte 0x93\r
+ .byte 0x8f # 16-bit segment\r
+ .byte 0\r
+\r
+_16Gdtr:\r
+ .word _16Gdtr - NullSegSel - 1\r
+ .long NullSegSel\r
+\r
+\r
+.text\r
+.align 16\r
+\r
+\r
+ASM_PFX(Thunk16):\r
+ push %ebp\r
+ push %ebx\r
+ push %esi\r
+ push %edi\r
+ push %ds\r
+ push %es\r
+ push %fs\r
+ push %gs\r
+ mov 0x24(%esp),%esi\r
+ movzwl 0x32(%esi),%edx\r
+ mov 0xc(%esi),%edi\r
+ add $0xffffffb0,%edi\r
+ push %edi #; save stack offset\r
+ imul $0x10,%edx,%eax #; eax <- edx*16\r
+ add %eax,%edi #; edi <- linear address of 16-bit stack\r
+ push $0xd\r
+ pop %ecx\r
+ rep movsl %ds:(%esi),%es:(%edi) #; copy context to 16-bit stack\r
+ pop %ebx #; ebx <- 16-bit stack offset\r
+ mov $L_Label1,%eax\r
+ stos %eax,%es:(%edi)\r
+ movl %cs,%eax\r
+ stos %ax,%es:(%edi)\r
+ mov 0x28(%esp),%eax\r
+ stos %ax,%es:(%edi)\r
+ mov %esp,%eax\r
+ stos %eax,%es:(%edi)\r
+ movl %ss,%eax\r
+ stos %ax,%es:(%edi)\r
+ sgdtl (%edi)\r
+ sidtl 0x24(%esp)\r
+ mov %cr0,%esi\r
+ mov %esi,0x6(%edi) #; save CR0\r
+ and $0x7ffffffe,%esi #; esi <- CR0 to set\r
+ mov %cr4,%eax\r
+ mov %eax,0xa(%edi) #; save CR4\r
+ and $0xcf,%al #; clear PAE & PSE\r
+ mov %edx,%edi #; edi <- 16-bit stack segment\r
+ mov 0x2c(%esp),%edx\r
+ shl $0x10,%edx\r
+ push %edx\r
+ pop %edx\r
+ mov $(_16BitSsSel - NullSegSel),%dx\r
+ lgdtl _16Gdtr #bugbug mismatch.\r
+ .byte 0xea\r
+ .long L_16Bit #bugbug mismatch.\r
+ .word _16BitCsSel - NullSegSel\r
+L_16Bit: \r
+ .byte 0x66 \r
+ movw %dx,%ss\r
+ mov %esi,%cr0\r
+ mov %eax,%cr4\r
+ .byte 0x67\r
+ .byte 0xff\r
+ .byte 0x6c\r
+ .byte 0x24\r
+ .byte 0xfc\r
+ \r
+L_Lable1:\r
+ movl %ss,%eax\r
+ shl $0x4,%eax\r
+ add %esp,%eax\r
+ lss 0x3c(%esp),%esp\r
+ lidtl 0x24(%esp)\r
+ pop %gs\r
+ pop %fs\r
+ pop %es\r
+ pop %ds\r
+ pop %edi\r
+ pop %esi\r
+ pop %ebx\r
+ pop %ebp\r
+ ret \r
+\r
+.code16\r
+_Code16Addr:\r
+ASM_PFX(RealMode):\r
+ movw %di, %ss # set up stack\r
+ movl %ebx, %esp\r
+ lidt %cs:_16Idtr - _Code16Addr #lidt fword ptr cs:[_16Idtr - _Code16Addr]\r
+ .byte 0x66\r
+ popaw\r
+ popw %ds\r
+ popw %es\r
+ popw %fs\r
+ popw %gs\r
+ addw $4, %sp # skip EFlags\r
+ testw $1, 14(%esp) #(_STK16 ptr [esp + 8]).ThunkFlags, 1\r
+ jz 1f\r
+ pushf\r
+1: \r
+ pushw %cs\r
+# push @FarCallRet - _Code16Addr\r
+ .byte 0x68 # push /iw\r
+ .word FarCallRet - _Code16Addr\r
+ jz 2f\r
+ ljmp *6(%esp) #bugbug\r
+2: \r
+ ljmp *4(%esp) #bugbug\r
+FarCallRet: \r
+ pushfl\r
+ pushw %gs\r
+ pushw %fs\r
+ pushw %es\r
+ pushw %ds\r
+ pushal\r
+ cli\r
+ .byte 0x66 # sizeof (IA32_REGS) = 13 * 4 = 52\r
+ lgdt 66(%esp) #lgdt (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedGdtr\r
+ mov 76(%esp), %eax\r
+ movl %eax, %cr4\r
+ mov 72(%esp), %eax\r
+ movl %eax, %cr0 # restore CR0\r
+ ljmpl *52(%esp) \r
+#RealMode ENDP\r
+\r
+.text\r
+_16Idtr:\r
+ .word 0x3ff #_16Idtr FWORD (1 SHL 10) - 1\r
+ .byte 0x00\r
+\r
+_TEXT16END: \r
+\r
+_TEXT16SIZE = _TEXT16END - _Code16Addr\r
+\r
+\r
projects / mirror_edk2.git / blobdiff