101 lines
2.4 KiB
PHP
101 lines
2.4 KiB
PHP
; Copyright (C) 2025 Elaina Claus
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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 <https://www.gnu.org/licenses/>.
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%ifnmacro __CDECL16_ENTRY
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%macro __CDECL16_ENTRY 0-1
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push bp
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mov bp, sp
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push si
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push di
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push bx
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%if %0 = 1
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sub sp, %1 ; reserve locals only when needed
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%endif
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%endmacro
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%endif
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%ifnmacro __CDECL16_EXIT
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%macro __CDECL16_EXIT 0
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pop bx
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pop di
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pop si
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mov sp, bp
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pop bp
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%endmacro
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%endif
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%ifnmacro __CDECL16_CALLER_SAVE
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%macro __CDECL16_CALLER_SAVE 0
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push ax
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push cx
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push dx
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%endmacro
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%endif
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%ifnmacro __CDECL16_CALLER_RESTORE
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%macro __CDECL16_CALLER_RESTORE 0
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pop dx
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pop cx
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pop ax
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%endmacro
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%endif
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%ifnmacro __FASTCALL16_ENTRY
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%macro __FASTCALL16_ENTRY 0
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push bp
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mov bp, sp
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%endmacro
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%endif
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%ifnmacro __FASTCALL16_EXIT
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%macro __FASTCALL16_EXIT 0
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mov sp, bp
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pop bp
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%endmacro
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%endif
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%ifnmacro __DEFLAT_DS_ES
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%macro __DEFLAT_DS_ES 0
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mov ax, __STAGE2_SEGMENT
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mov ds, ax
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mov es, ax
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%endmacro
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%endif
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%ifnmacro __REFLAT_DS_ES
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%macro __REFLAT_ES 0
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cli ; no interrupts
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lgdt [((__STAGE2_SEGMENT << 4) + unreal_gdt_info)] ; load unreal gdt
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mov eax, cr0
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or eax, 1 ; set pmode bit
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mov cr0, eax ; switch to pmode
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jmp short $+2 ; i-cache flush
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mov ax, 0x10 ; select descriptor 2
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mov ds, ax ; 10h = 0001_0000b
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mov es, ax ; es to big data
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mov eax, cr0
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and eax, ~1 ; toggle bit 1 of cr0
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mov cr0, eax ; back to realmode
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jmp short $+2 ; i-cache flush
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sti
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%endmacro
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%endif |