projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| b341712e | 1 | #*****************************************************************************\r |
| 2 | #*\r | |
| 4ea9375a HT |
3 | #* Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r |
| 4 | #* This program and the accompanying materials \r | |
| b341712e | 5 | #* are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | #* which accompanies this distribution. The full text of the license may be found at \r | |
| 7 | #* http://opensource.org/licenses/bsd-license.php \r | |
| 8 | #* \r | |
| 9 | #* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 10 | #* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 11 | #* \r | |
| 12 | #* Module Name:\r | |
| 13 | #*\r | |
| 14 | #* Thunk.asm\r | |
| 15 | #* \r | |
| 16 | #* Abstract:\r | |
| 17 | #* \r | |
| 18 | #* Real mode thunk\r | |
| 19 | #* \r | |
| 20 | #*****************************************************************************\r | |
| 21 | #include <EfiBind.h>\r | |
| 22 | \r | |
| 23 | .686p: \r | |
| 24 | \r | |
| 25 | .globl ASM_PFX(mCode16Size)\r | |
| 26 | \r | |
| 27 | .data\r | |
| 28 | mCode16Size: .long _TEXT16SIZE\r | |
| 29 | \r | |
| 30 | .data\r | |
| 31 | \r | |
| 32 | NullSegSel: .quad 0\r | |
| 33 | _16BitCsSel: \r | |
| 34 | .word -1\r | |
| 35 | .word 0\r | |
| 36 | .byte 0\r | |
| 37 | .byte 0x9b\r | |
| 38 | .byte 0x8f # 16-bit segment\r | |
| 39 | .byte 0\r | |
| 40 | _16BitSsSel:\r | |
| 41 | .word -1\r | |
| 42 | .word 0\r | |
| 43 | .byte 0\r | |
| 44 | .byte 0x93\r | |
| 45 | .byte 0x8f # 16-bit segment\r | |
| 46 | .byte 0\r | |
| 47 | \r | |
| 48 | _16Gdtr:\r | |
| 49 | .word _16Gdtr - NullSegSel - 1\r | |
| 50 | .long NullSegSel\r | |
| 51 | \r | |
| 52 | \r | |
| 53 | .text\r | |
| b341712e | 54 | \r |
| 55 | \r | |
| 56 | ASM_PFX(Thunk16):\r | |
| 57 | push %ebp\r | |
| 58 | push %ebx\r | |
| 59 | push %esi\r | |
| 60 | push %edi\r | |
| 61 | push %ds\r | |
| 62 | push %es\r | |
| 63 | push %fs\r | |
| 64 | push %gs\r | |
| 65 | mov 0x24(%esp),%esi\r | |
| 66 | movzwl 0x32(%esi),%edx\r | |
| 67 | mov 0xc(%esi),%edi\r | |
| 68 | add $0xffffffb0,%edi\r | |
| 69 | push %edi #; save stack offset\r | |
| 70 | imul $0x10,%edx,%eax #; eax <- edx*16\r | |
| 71 | add %eax,%edi #; edi <- linear address of 16-bit stack\r | |
| 72 | push $0xd\r | |
| 73 | pop %ecx\r | |
| 74 | rep movsl %ds:(%esi),%es:(%edi) #; copy context to 16-bit stack\r | |
| 75 | pop %ebx #; ebx <- 16-bit stack offset\r | |
| e8de4680 | 76 | mov $L_Lable1,%eax\r |
| b341712e | 77 | stos %eax,%es:(%edi)\r |
| 78 | movl %cs,%eax\r | |
| 79 | stos %ax,%es:(%edi)\r | |
| 80 | mov 0x28(%esp),%eax\r | |
| 81 | stos %ax,%es:(%edi)\r | |
| 82 | mov %esp,%eax\r | |
| 83 | stos %eax,%es:(%edi)\r | |
| 84 | movl %ss,%eax\r | |
| 85 | stos %ax,%es:(%edi)\r | |
| 86 | sgdtl (%edi)\r | |
| 87 | sidtl 0x24(%esp)\r | |
| 88 | mov %cr0,%esi\r | |
| 89 | mov %esi,0x6(%edi) #; save CR0\r | |
| 90 | and $0x7ffffffe,%esi #; esi <- CR0 to set\r | |
| 91 | mov %cr4,%eax\r | |
| 92 | mov %eax,0xa(%edi) #; save CR4\r | |
| 93 | and $0xcf,%al #; clear PAE & PSE\r | |
| 94 | mov %edx,%edi #; edi <- 16-bit stack segment\r | |
| 95 | mov 0x2c(%esp),%edx\r | |
| 96 | shl $0x10,%edx\r | |
| 97 | push %edx\r | |
| 98 | pop %edx\r | |
| 99 | mov $(_16BitSsSel - NullSegSel),%dx\r | |
| 100 | lgdtl _16Gdtr #bugbug mismatch.\r | |
| 101 | .byte 0xea\r | |
| 102 | .long L_16Bit #bugbug mismatch.\r | |
| 103 | .word _16BitCsSel - NullSegSel\r | |
| 104 | L_16Bit: \r | |
| 105 | .byte 0x66 \r | |
| 106 | movw %dx,%ss\r | |
| 107 | mov %esi,%cr0\r | |
| 108 | mov %eax,%cr4\r | |
| 109 | .byte 0x67\r | |
| 110 | .byte 0xff\r | |
| 111 | .byte 0x6c\r | |
| 112 | .byte 0x24\r | |
| 113 | .byte 0xfc\r | |
| 114 | \r | |
| 115 | L_Lable1:\r | |
| 116 | movl %ss,%eax\r | |
| 117 | shl $0x4,%eax\r | |
| 118 | add %esp,%eax\r | |
| 119 | lss 0x3c(%esp),%esp\r | |
| 120 | lidtl 0x24(%esp)\r | |
| 121 | pop %gs\r | |
| 122 | pop %fs\r | |
| 123 | pop %es\r | |
| 124 | pop %ds\r | |
| 125 | pop %edi\r | |
| 126 | pop %esi\r | |
| 127 | pop %ebx\r | |
| 128 | pop %ebp\r | |
| 129 | ret \r | |
| 130 | \r | |
| 131 | .code16\r | |
| 132 | _Code16Addr:\r | |
| 133 | ASM_PFX(RealMode):\r | |
| 134 | movw %di, %ss # set up stack\r | |
| 135 | movl %ebx, %esp\r | |
| 136 | lidt %cs:_16Idtr - _Code16Addr #lidt fword ptr cs:[_16Idtr - _Code16Addr]\r | |
| 137 | .byte 0x66\r | |
| 138 | popaw\r | |
| 139 | popw %ds\r | |
| 140 | popw %es\r | |
| 141 | popw %fs\r | |
| 142 | popw %gs\r | |
| 143 | addw $4, %sp # skip EFlags\r | |
| 144 | testw $1, 14(%esp) #(_STK16 ptr [esp + 8]).ThunkFlags, 1\r | |
| 145 | jz 1f\r | |
| 146 | pushf\r | |
| 147 | 1: \r | |
| 148 | pushw %cs\r | |
| 149 | # push @FarCallRet - _Code16Addr\r | |
| 150 | .byte 0x68 # push /iw\r | |
| 151 | .word FarCallRet - _Code16Addr\r | |
| 152 | jz 2f\r | |
| 153 | ljmp *6(%esp) #bugbug\r | |
| 154 | 2: \r | |
| 155 | ljmp *4(%esp) #bugbug\r | |
| 156 | FarCallRet: \r | |
| 157 | pushfl\r | |
| 158 | pushw %gs\r | |
| 159 | pushw %fs\r | |
| 160 | pushw %es\r | |
| 161 | pushw %ds\r | |
| 162 | pushal\r | |
| 163 | cli\r | |
| 164 | .byte 0x66 # sizeof (IA32_REGS) = 13 * 4 = 52\r | |
| 165 | lgdt 66(%esp) #lgdt (_STK16 ptr [esp + sizeof (IA32_REGS)]).SavedGdtr\r | |
| 166 | mov 76(%esp), %eax\r | |
| 167 | movl %eax, %cr4\r | |
| 168 | mov 72(%esp), %eax\r | |
| 169 | movl %eax, %cr0 # restore CR0\r | |
| 170 | ljmpl *52(%esp) \r | |
| 171 | #RealMode ENDP\r | |
| 172 | \r | |
| 173 | .text\r | |
| 174 | _16Idtr:\r | |
| 175 | .word 0x3ff #_16Idtr FWORD (1 SHL 10) - 1\r | |
| 176 | .byte 0x00\r | |
| 177 | \r | |
| 178 | _TEXT16END: \r | |
| 179 | \r | |
| 180 | _TEXT16SIZE = _TEXT16END - _Code16Addr\r | |
| 181 | \r | |
| 182 | \r |