X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=EdkCompatibilityPkg%2FFoundation%2FLibrary%2FEdkIIGlueLib%2FLibrary%2FBaseLib%2FX64%2FThunk16.asm;fp=EdkCompatibilityPkg%2FFoundation%2FLibrary%2FEdkIIGlueLib%2FLibrary%2FBaseLib%2FX64%2FThunk16.asm;h=0000000000000000000000000000000000000000;hp=b181a4ccfd5c6803b25cfd0989308939ecb97741;hb=c455bc8c8d78ad51c24426a500914ea32504bf06;hpb=5bca07268acabe7f31407358e875ccf89cb5e386 diff --git a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/Thunk16.asm b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/Thunk16.asm deleted file mode 100644 index b181a4ccfd..0000000000 --- a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/Thunk16.asm +++ /dev/null @@ -1,296 +0,0 @@ -; Copyright (c) 2004 - 2011, 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 -; -;------------------------------------------------------------------------------ - -EXTERNDEF m16Start:BYTE -EXTERNDEF m16Size:WORD -EXTERNDEF mThunk16Attr:WORD -EXTERNDEF m16Gdt:WORD -EXTERNDEF m16GdtrBase:WORD -EXTERNDEF mTransition:WORD - -THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 EQU 2 -THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL EQU 4 - -IA32_REGS STRUC 4t -_EDI DD ? -_ESI DD ? -_EBP DD ? -_ESP DD ? -_EBX DD ? -_EDX DD ? -_ECX DD ? -_EAX DD ? -_DS DW ? -_ES DW ? -_FS DW ? -_GS DW ? -_EFLAGS DQ ? -_EIP DD ? -_CS DW ? -_SS DW ? -IA32_REGS ENDS - - .const - -m16Size DW InternalAsmThunk16 - m16Start -mThunk16Attr DW _ThunkAttr - m16Start -m16Gdt DW _NullSeg - m16Start -m16GdtrBase DW _16GdtrBase - m16Start -mTransition DW _EntryPoint - m16Start - - .code - -m16Start LABEL BYTE - -SavedGdt LABEL FWORD - DW ? - DQ ? - -;------------------------------------------------------------------------------ -; _BackFromUserCode() takes control in real mode after 'retf' has been executed -; by user code. It will be shadowed to somewhere in memory below 1MB. -;------------------------------------------------------------------------------ -_BackFromUserCode PROC - ; - ; The order of saved registers on the stack matches the order they appears - ; in IA32_REGS structure. This facilitates wrapper function to extract them - ; into that structure. - ; - ; Some instructions for manipulation of segment registers have to be written - ; in opcode since 64-bit MASM prevents accesses to those registers. - ; - DB 16h ; push ss - DB 0eh ; push cs - DB 66h - call @Base ; push eip -@Base: - DB 66h - push 0 ; reserved high order 32 bits of EFlags - pushf ; pushfd actually - cli ; disable interrupts - push gs - push fs - DB 6 ; push es - DB 1eh ; push ds - DB 66h, 60h ; pushad - DB 66h, 0bah ; mov edx, imm32 -_ThunkAttr DD ? - test dl, THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 - jz @1 - mov eax, 15cd2401h ; mov ax, 2401h & int 15h - cli ; disable interrupts - jnc @2 -@1: - test dl, THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL - jz @2 - in al, 92h - or al, 2 - out 92h, al ; deactivate A20M# -@2: - xor ax, ax ; xor eax, eax - mov eax, ss ; mov ax, ss - lea bp, [esp + sizeof (IA32_REGS)] - ; - ; rsi in the following 2 instructions is indeed bp in 16-bit code - ; - mov word ptr (IA32_REGS ptr [rsi - sizeof (IA32_REGS)])._ESP, bp - DB 66h - mov ebx, (IA32_REGS ptr [rsi - sizeof (IA32_REGS)])._EIP - shl ax, 4 ; shl eax, 4 - add bp, ax ; add ebp, eax - mov ax, cs - shl ax, 4 - lea ax, [eax + ebx + (@64BitCode - @Base)] - DB 66h, 2eh, 89h, 87h ; mov cs:[bx + (@64Eip - @Base)], eax - DW @64Eip - @Base - DB 66h, 0b8h ; mov eax, imm32 -SavedCr4 DD ? - mov cr4, rax - ; - ; rdi in the instruction below is indeed bx in 16-bit code - ; - DB 66h, 2eh ; 2eh is "cs:" segment override - lgdt fword ptr [rdi + (SavedGdt - @Base)] - DB 66h - mov ecx, 0c0000080h - rdmsr - or ah, 1 - wrmsr - DB 66h, 0b8h ; mov eax, imm32 -SavedCr0 DD ? - mov cr0, rax - DB 66h, 0eah ; jmp far cs:@64Bit -@64Eip DD ? -SavedCs DW ? -@64BitCode: - db 090h - db 067h, 0bch ; mov esp, imm32 -SavedSp DD ? ; restore stack - nop - ret -_BackFromUserCode ENDP - -_EntryPoint DD _ToUserCode - m16Start - DW CODE16 -_16Gdtr LABEL FWORD - DW GDT_SIZE - 1 -_16GdtrBase DQ _NullSeg -_16Idtr FWORD (1 SHL 10) - 1 - -;------------------------------------------------------------------------------ -; _ToUserCode() takes control in real mode before passing control to user code. -; It will be shadowed to somewhere in memory below 1MB. -;------------------------------------------------------------------------------ -_ToUserCode PROC - mov ss, edx ; set new segment selectors - mov ds, edx - mov es, edx - mov fs, edx - mov gs, edx - DB 66h - mov ecx, 0c0000080h - mov cr0, rax ; real mode starts at next instruction - rdmsr - and ah, NOT 1 - wrmsr - mov cr4, rbp - mov ss, esi ; set up 16-bit stack segment - mov sp, bx ; set up 16-bit stack pointer - DB 66h ; make the following call 32-bit - call @Base ; push eip -@Base: - pop bp ; ebp <- address of @Base - push [esp + sizeof (IA32_REGS) + 2] - lea eax, [rsi + (@RealMode - @Base)] ; rsi is "bp" in 16-bit code - push rax - retf ; execution begins at next instruction -@RealMode: - DB 66h, 2eh ; CS and operand size override - lidt fword ptr [rsi + (_16Idtr - @Base)] - DB 66h, 61h ; popad - DB 1fh ; pop ds - DB 07h ; pop es - pop fs - pop gs - popf ; popfd - lea sp, [esp + 4] ; skip high order 32 bits of EFlags - DB 66h ; make the following retf 32-bit - retf ; transfer control to user code -_ToUserCode ENDP - -CODE16 = _16Code - $ -DATA16 = _16Data - $ -DATA32 = _32Data - $ - -_NullSeg DQ 0 -_16Code LABEL QWORD - DW -1 - DW 0 - DB 0 - DB 9bh - DB 8fh ; 16-bit segment, 4GB limit - DB 0 -_16Data LABEL QWORD - DW -1 - DW 0 - DB 0 - DB 93h - DB 8fh ; 16-bit segment, 4GB limit - DB 0 -_32Data LABEL QWORD - DW -1 - DW 0 - DB 0 - DB 93h - DB 0cfh ; 16-bit segment, 4GB limit - DB 0 - -GDT_SIZE = $ - _NullSeg - -;------------------------------------------------------------------------------ -; IA32_REGISTER_SET * -; EFIAPI -; InternalAsmThunk16 ( -; IN IA32_REGISTER_SET *RegisterSet, -; IN OUT VOID *Transition -; ); -;------------------------------------------------------------------------------ -InternalAsmThunk16 PROC USES rbp rbx rsi rdi - mov rbx, ds - push rbx ; Save ds segment register on the stack - mov rbx, es - push rbx ; Save es segment register on the stack - mov rbx, ss - push rbx ; Save ss segment register on the stack - - push fs - push gs - mov rsi, rcx - movzx r8d, (IA32_REGS ptr [rsi])._SS - mov edi, (IA32_REGS ptr [rsi])._ESP - lea rdi, [edi - (sizeof (IA32_REGS) + 4)] - imul eax, r8d, 16 ; eax <- r8d(stack segment) * 16 - mov ebx, edi ; ebx <- stack for 16-bit code - push sizeof (IA32_REGS) / 4 - add edi, eax ; edi <- linear address of 16-bit stack - pop rcx - rep movsd ; copy RegSet - lea ecx, [rdx + (SavedCr4 - m16Start)] - mov eax, edx ; eax <- transition code address - and edx, 0fh - shl eax, 12 ; segment address in high order 16 bits - lea ax, [rdx + (_BackFromUserCode - m16Start)] ; offset address - stosd ; [edi] <- return address of user code - sgdt fword ptr [rcx + (SavedGdt - SavedCr4)] - sidt fword ptr [rsp + 50h] ; save IDT stack in argument space - mov rax, cr0 - mov [rcx + (SavedCr0 - SavedCr4)], eax - and eax, 7ffffffeh ; clear PE, PG bits - mov rbp, cr4 - mov [rcx], ebp ; save CR4 in SavedCr4 - and ebp, 300h ; clear all but PCE and OSFXSR bits - mov esi, r8d ; esi <- 16-bit stack segment - DB 6ah, DATA32 ; push DATA32 - pop rdx ; rdx <- 32-bit data segment selector - lgdt fword ptr [rcx + (_16Gdtr - SavedCr4)] - mov ss, edx - pushfq - lea edx, [rdx + DATA16 - DATA32] - lea r8, @RetFromRealMode - push r8 - mov r8d, cs - mov [rcx + (SavedCs - SavedCr4)], r8w - mov [rcx + (SavedSp - SavedCr4)], esp - jmp fword ptr [rcx + (_EntryPoint - SavedCr4)] -@RetFromRealMode: - popfq - lidt fword ptr [rsp + 50h] ; restore protected mode IDTR - lea eax, [rbp - sizeof (IA32_REGS)] - pop gs - pop fs - pop rbx - mov ss, rbx - pop rbx - mov es, rbx - pop rbx - mov ds, rbx - ret -InternalAsmThunk16 ENDP - - END