; $Id: bs3-fpustate-1-template.mac $
;; @file
; BS3Kit - bs3-fpustate-1, assembly template.
;

;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;


;*********************************************************************************************************************************
;*  Header Files                                                                                                                 *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"   ; setup environment


;*********************************************************************************************************************************
;*  External Symbols                                                                                                             *
;*********************************************************************************************************************************
TMPL_BEGIN_TEXT


;;
; Initializes the FPU state and saves it to pFxState.
;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_InitState)(X86FXSTATE BS3_FAR *pFxState, void *pvMmioReg);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_InitState, BS3_PBC_NEAR
        BS3_CALL_CONV_PROLOG 2
        push    xBP
        mov     xBP, xSP
        push    xBX
TONLY16 push    ds
        pushf
TONLY64 sub     xSP, 20h

        ;
        ; x87 state.
        ;
        fninit
        fld     dword [TMPL_DATA16_WRT(g_r32V1)]
        fld     qword [TMPL_DATA16_WRT(g_r64V1)]
        fld     tword [TMPL_DATA16_WRT(g_r80V1)]
        fld     qword [TMPL_DATA16_WRT(g_r64V1)]
        fld     dword [TMPL_DATA16_WRT(g_r32V2)]
        fld     dword [TMPL_DATA16_WRT(g_r80_QNaNMax)]
        fld     tword [TMPL_DATA16_WRT(g_r80_SNaNMax)]
        fld     tword [TMPL_DATA16_WRT(g_r80_ThirtyTwo)]

        ;
        ; We'll later be using FMUL to test actually using the FPU in RC & R0,
        ; so for everything to line up correctly with FPU CS:IP and FPU DS:DP,
        ; we'll call the function here too.  This has the benefitial side effect
        ; of loading correct FPU DS/DS values so we can check that they don't
        ; get lost either.  Also, we now don't have to guess whether the CPU
        ; emulation sets CS/DS or not.
        ;
TONLY16 push    xPRE [xBP + xCB + cbCurRetAddr + sCB + 2]
        push    xPRE [xBP + xCB + cbCurRetAddr + sCB]
        BS3_CALL TMPL_NM(bs3FpuState1_FMul), 1
        add     xSP, sCB

        ;
        ; SSE state
        ;
        movdqu  xmm0, [TMPL_DATA16_WRT(g_r32_0dot1)]
        movdqu  xmm1, [TMPL_DATA16_WRT(g_r32_Two)]
        movdqu  xmm2, [TMPL_DATA16_WRT(g_r32_ThirtyTwo)]
        movdqu  xmm3, [TMPL_DATA16_WRT(g_r32_ThirtyTwo)]
        movdqu  xmm4, [TMPL_DATA16_WRT(g_r32_SNaN)]
        movdqu  xmm5, [TMPL_DATA16_WRT(g_r32_NegQNaN)]
        movdqu  xmm6, [TMPL_DATA16_WRT(g_r64_Zero)]
        movdqu  xmm7, [TMPL_DATA16_WRT(g_r64_Two)]
%if TMPL_BITS == 64
        movdqu  xmm8, [TMPL_DATA16_WRT(g_r64_Ten)]
        movdqu  xmm9, [TMPL_DATA16_WRT(g_r64_ThirtyTwo)]
        movdqu  xmm10, [TMPL_DATA16_WRT(g_r64_Max)]
        movdqu  xmm11, [TMPL_DATA16_WRT(g_r64_SNaN)]
        movdqu  xmm12, [TMPL_DATA16_WRT(g_r64_NegQNaN)]
        movdqu  xmm13, [TMPL_DATA16_WRT(g_r64_QNaNMax)]
        movdqu  xmm14, [TMPL_DATA16_WRT(g_r64_DnMax)]
        movdqu  xmm15, [TMPL_DATA16_WRT(g_r80_Eleven)]
%endif

        ;; @todo status regs

        ;
        ; Save it.  Note that DS is no longer valid in 16-bit code.
        ; To be on the safe side, we load and save the state once again.
        ;
TONLY16 mov     ds, [xBP + xCB + cbCurRetAddr + 2]
        mov     xBX, [xBP + xCB + cbCurRetAddr]
        cli
%if TMPL_BITS == 64
        o64 fxsave [xBX]
        fninit
        o64 fxrstor [xBX]
        o64 fxsave [xBX]
%else
        fxsave  [xBX]
        fninit
        fxrstor [xBX]
        fxsave  [xBX]
%endif

.return:
TONLY64 add     xSP, 20h
        popf
TONLY16 pop     ds
        pop     xBX
        mov     xSP, xBP
        pop     xBP
        BS3_CALL_CONV_EPILOG 2
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_InitState


;;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_Restore)(X86FXSTATE const BS3_FAR *pFxState);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_Restore, BS3_PBC_NEAR
        push    xBP
        mov     xBP, xSP

%if TMPL_BITS == 64
        o64     fxrstor [rcx]

%elif TMPL_BITS == 32
        mov     eax, [xBP + xCB*2]
        fxrstor [eax]

%elif TMPL_BITS == 16
        mov     ax, ds
        mov     ds, [xBP + xCB + cbCurRetAddr + 2]
        mov     xBX, [xBP + xCB + cbCurRetAddr]
        fxrstor [bx]
        mov     ds, ax
%else
 %error TMPL_BITS
%endif

        mov     xSP, xBP
        pop     xBP
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_Restore

;;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_Save)(X86FXSTATE BS3_FAR *pFxState);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_Save, BS3_PBC_NEAR
        push    xBP
        mov     xBP, xSP

%if TMPL_BITS == 64
        o64     fxsave [rcx]

%elif TMPL_BITS == 32
        mov     eax, [xBP + xCB*2]
        fxsave  [eax]

%elif TMPL_BITS == 16
        push    bx
        push    ds
        mov     ds, [xBP + xCB + cbCurRetAddr + 2]
        mov     bx, [xBP + xCB + cbCurRetAddr]
        fxsave  [bx]
        pop     ds
        pop     bx
%else
 %error TMPL_BITS
%endif

        mov     xSP, xBP
        pop     xBP
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_Save


;;
; Performs a MOVDQU write on the specified memory.
;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_MovDQU_Write)(void *pvMmioReg);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_MovDQU_Write, BS3_PBC_NEAR
        BS3_CALL_CONV_PROLOG 1
        push    xBP
        mov     xBP, xSP
        push    xBX
TONLY16 push    ds

        ; Load the register pointer.
        mov     xBX, [xBP + xCB + cbCurRetAddr]
TONLY16 mov     ds,  [xBP + xCB + cbCurRetAddr + 2]

        ; Do read.
        movdqu  [xBX], xmm3

TONLY16 pop     ds
        pop     xBX
        leave
        BS3_CALL_CONV_EPILOG 1
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_MovDQU_Write


;;
; Performs a MOVDQU write to the specified memory.
;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_MovDQU_Read)(void *pvMmioReg);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_MovDQU_Read, BS3_PBC_NEAR
        BS3_CALL_CONV_PROLOG 1
        push    xBP
        mov     xBP, xSP
        push    xBX
TONLY16 push    ds
        sub     xSP, 20h
%if TMPL_BITS == 16
        movdqu  [xBP - xCB - xCB - 2 - 18h], xmm2
%else
        movdqu  [xSP], xmm2
%endif

        ; Load the register pointer.
        mov     xBX, [xBP + xCB + cbCurRetAddr]
TONLY16 mov     ds,  [xBP + xCB + cbCurRetAddr + 2]


        ; Do read.
        movdqu  xmm2, [xBX]

%if TMPL_BITS == 16
        movdqu  xmm2, [xBP - xCB - xCB - 2 - 18h]
%else
        movdqu  xmm2, [xSP]
%endif
        add     xSP, 20h
TONLY16 pop     ds
        pop     xBX
        mov     xSP, xBP
        pop     xBP
        BS3_CALL_CONV_EPILOG 1
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_MovDQU_Read


;;
; Performs a FNSTENV write on the specified memory.
;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_FNStEnv)(void *pvMmioReg);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_FNStEnv, BS3_PBC_NEAR
        BS3_CALL_CONV_PROLOG 1
        push    xBP
        mov     xBP, xSP
        push    xBX
TONLY16 push    ds

        ; Load the register pointer.
        mov     xBX, [xBP + xCB + cbCurRetAddr]
TONLY16 mov     ds,  [xBP + xCB + cbCurRetAddr + 2]

        ; Just write.
        fnstenv [xBX]

TONLY16 pop     ds
        pop     xBX
        mov     xSP, xBP
        pop     xBP
        BS3_CALL_CONV_EPILOG 1
        BS3_HYBRID_RET
BS3_PROC_END_MODE   bs3FpuState1_FNStEnv


;;
; Performs a FMUL on the specified memory, after writing a 64-bit value to it first.
;
; BS3_DECL_NEAR(void) TMPL_NM(bs3FpuState1_FMul)(void *pvMmioReg);
;
BS3_PROC_BEGIN_MODE bs3FpuState1_FMul, BS3_PBC_NEAR
        BS3_CALL_CONV_PROLOG 1
        push    xBP
        mov     xBP, xSP
        push    xBX
TONLY16 push    ds

        ; Load the value we'll be multiplying with into register(s) while ds is DATA16.
        mov     sAX, [TMPL_DATA16_WRT(g_r64_One)]
TNOT64  mov     edx, [4 + TMPL_DATA16_WRT(g_r64_One)]

        ; Load the register pointer.
        mov     xBX, [xBP + xCB + cbCurRetAddr]
TONLY16 mov     ds,  [xBP + xCB + cbCurRetAddr + 2]

        ; Just write.
        mov     [xBX], sAX
TNOT64  mov     [xBX + 4], edx
        call    .do_it

TONLY16 pop     ds
        pop     xBX
        mov     xSP, xBP
        pop     xBP
        BS3_CALL_CONV_EPILOG 1
        BS3_HYBRID_RET
.do_it:
        fmul    qword [xBX]
        ret
BS3_PROC_END_MODE   bs3FpuState1_FMul


%include "bs3kit-template-footer.mac"   ; reset environment