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|
; $Id: commondefs.inc $
;; @file
; Stuff for drawing the BIOS logo.
;
;
; Copyright (C) 2004-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; SPDX-License-Identifier: GPL-3.0-only
;
;; Switches back to default CPU mode.
SET_DEFAULT_CPU macro
if VBOX_BIOS_CPU eq 8086
.8086
elseif VBOX_BIOS_CPU eq 80186
.186
elseif VBOX_BIOS_CPU eq 80286
.286
elseif VBOX_BIOS_CPU eq 80386
.386
else
.errnz 1, Unsupported target CPU value: VBOX_BIOS_CPU
.386
endif
endm
;; Switches back to default CPU mode, max 286.
SET_DEFAULT_CPU_286 macro
if VBOX_BIOS_CPU eq 8086
.8086
elseif VBOX_BIOS_CPU eq 80186
.186
else
.286
endif
endm
;;
; Pretends to do a call by pushing the return address and jumping
; to the function.
;
; This is slightly problematic on 8086 since it doesn't support pushing
; word immediates. OTOH, it support pushing memory, so we'll do that
; instead when targeting 8086.
;
if 0 ;; this crap crashes wasm, makes it call exit(0), or similar weird stuff.
;; switched to a simpler approach where I define the one return address variable myself.
DO_JMP_CALL macro calling, returning
if VBOX_BIOS_CPU gt 8086
push returning
jmp calling
else
push word ptr cs:[%jmp_call_addr_&returning]
jmp calling
;public jmp_call_addr_&returning
%jmp_call_addr_&returning: dw offset retaddr
endif
endm
DO_JMP_CALL_AGAIN macro calling, returning
if VBOX_BIOS_CPU gt 8086
push returning
jmp calling
else
push word ptr cs:[%jmp_call_addr_&returning]
jmp calling
endif
endm
else ; Simplified.
DO_JMP_CALL_EX macro calling, returning, returning_ptr_var
if VBOX_BIOS_CPU gt 8086
push returning
jmp calling
else
push word ptr cs:[returning_ptr_var]
jmp calling
endif
endm
endif ; Simplified.
;; For handling the pusha instruction depending on target CPU.
DO_pusha macro
if VBOX_BIOS_CPU gt 8086
pusha
else
push ax
push cx
push dx
push bx
push sp
push bp
push si
push di
endif
endm
;; For handling the popad/popa instruction depending on target CPU.
DO_popa macro
if VBOX_BIOS_CPU gt 8086
popa
else
pop di
pop si
pop bp
pop bx ;pop sp
pop bx
pop dx
pop cx
pop ax
endif
endm
;; For handling the pushad/pusha instruction depending on target CPU.
DO_PUSHAD macro
if VBOX_BIOS_CPU ge 80386
pushad
elseif VBOX_BIOS_CPU gt 8086
pusha
else
push ax
push cx
push dx
push bx
push sp
push bp
push si
push di
endif
endm
;; For handling the popad/popa instruction depending on target CPU.
DO_POPAD macro
if VBOX_BIOS_CPU ge 80386
popad
elseif VBOX_BIOS_CPU gt 8086
popa
else
pop di
pop si
pop bp
pop bx ;pop sp
pop bx
pop dx
pop cx
pop ax
endif
endm
;; ASSUMES working stack.
DO_shr macro reg, count
if VBOX_BIOS_CPU ge 80186
shr reg, count
else
if count ge 6
push cx
mov cl, count
shr reg, cl
pop cx
else
if count ge 5
shr reg, 1
endif
if count ge 4
shr reg, 1
endif
if count ge 3
shr reg, 1
endif
if count ge 2
shr reg, 1
endif
if count ge 1
shr reg, 1
endif
endif
endif
endm
;; ASSUMES working stack.
DO_shl macro reg, count
if VBOX_BIOS_CPU ge 80186
shl reg, count
else
if count ge 6
push cx
mov cl, count
shl reg, cl
pop cx
else
if count ge 5
shl reg, 1
endif
if count ge 4
shl reg, 1
endif
if count ge 3
shl reg, 1
endif
if count ge 2
shl reg, 1
endif
if count ge 1
shl reg, 1
endif
endif
endif
endm
;; Adds a special label that will have its address checked after linking.
BIOSORG_CHECK macro addr
public biosorg_check_at_&addr
biosorg_check_at_&addr:
endm
;; Adds a special label that will have its address checked after linking.
BIOSORG_CHECK_BEFORE macro addr
public biosorg_check_before_or_at_&addr
biosorg_check_before_or_at_&addr:
endm
|
