145 lines
4.7 KiB
NASM
145 lines
4.7 KiB
NASM
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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;***************************************************************************
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;** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
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;***************************************************************************
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;* *
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;* Project Name : Westwood 32 bit Library *
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;* *
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;* File Name : VESA.ASM *
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;* *
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;* Programmer : Phil W. Gorrow *
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;* *
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;* Start Date : December 8, 1994 *
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;* *
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;* Last Update : December 8, 1994 [PWG] *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* Vesa_Asm_Set_Win -- Sets the current vesa window from Asm *
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;* Vesa_Asm_Next_Window -- Sets to the next vesa window *
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;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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IDEAL
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P386
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MODEL USE32 FLAT
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LOCALS ??
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INCLUDE "svgaprim.inc"
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GLOBAL RMVesaVector : DWORD
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GLOBAL RMVesaRegs : DWORD
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DPMI_INTR EQU 31h
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STRUC DPMI_REGS
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_edi dd ?
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_esi dd ?
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_ebp dd ?
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dd ?
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_ebx dd ?
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_edx dd ?
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_ecx dd ?
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_eax dd ?
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Flags dw ?
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_es dw ?
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_ds dw ?
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_fs dw ?
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_gs dw ?
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_ip dw ?
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_cs dw ?
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_sp dw ?
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_ss dw ?
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dd ?
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ENDS
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DATASEG
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cpu_video_page dd 0h
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cpu_page_limit dd 0b0000h
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CurrentBank DD 0h ; current vesa bank
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RealFunc DPMI_REGS ? ; structure to call a real mode int
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CODESEG
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;***************************************************************************
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;* VESA_ASM_SET_WIN -- Sets the current vesa window from Asm *
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;* *
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;* INPUT: edi - offset to set the window for *
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;* *
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;* OUTPUT: edi - adjusted offset for window *
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;* *
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;* PROTO: void Vesa_Asm_Set_Win(void); *
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;* *
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;* HISTORY: *
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;* 12/08/1994 PWG : Created. *
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;*=========================================================================*
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PROC Vesa_Asm_Set_Win C near
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push eax
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push edi
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push ecx
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push ebx
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mov eax , edi
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and eax , 0ffff0000h
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add eax , 010000h
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mov [ cpu_page_limit ] , eax
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lea eax , [ edi - 0a0000h ]
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and eax , 0ffff0000h
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mov [ cpu_video_page ] , eax
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shr eax , 14
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cmp eax , [ CurrentBank ]
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jz ??no_change
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mov [CurrentBank],eax ; it will be new current bank
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mov ebx , [ BankTable + eax ] ; find gran value of new bank
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mov edi , [ RMVesaRegs ] ; clean up RMRegister bank
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xor eax , eax
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mov ecx , 34h / 4 ; size of RMRegs Bank
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rep stosd
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mov edi , [ RMVesaRegs ]
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mov [(type DPMI_REGS ptr edi ) . _eax ] , 04f05h
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mov [(type DPMI_REGS ptr edi ) . _ebx ] , 0
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mov [(type DPMI_REGS ptr edi ) . _edx ] , ebx
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mov eax , 0300h
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xor ecx , ecx ; set amount to copy of stack
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mov ebx , [ RMVesaVector] ; set pointer to func to call
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int DPMI_INTR ; make the call
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??no_change:
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pop ebx
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pop ecx
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pop edi
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pop eax
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and edi,0000ffffh ; adjust edi to be 64k
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add edi,0a0000h
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ret
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ENDP Vesa_Asm_Set_Win
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END
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