diff options
Diffstat (limited to 'src/VBox/Devices/BiosCommonCode/commondefs.inc')
| -rw-r--r-- | src/VBox/Devices/BiosCommonCode/commondefs.inc | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/src/VBox/Devices/BiosCommonCode/commondefs.inc b/src/VBox/Devices/BiosCommonCode/commondefs.inc new file mode 100644 index 00000000..d8a7aca5 --- /dev/null +++ b/src/VBox/Devices/BiosCommonCode/commondefs.inc @@ -0,0 +1,251 @@ +; $Id: commondefs.inc $ +;; @file +; Stuff for drawing the BIOS logo. +; + +; +; Copyright (C) 2004-2022 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 + |