; $Id: commondefs.inc 93115 2022-01-01 11:31:46Z vboxsync $ ;; @file ; Stuff for drawing the BIOS logo. ; ; ; Copyright (C) 2004-2022 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. ; ;; 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