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convert MBR, VBR, & Stage2 to use a BSS section. #3

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Nivirx merged 25 commits from bss-setup into trunk 2024-10-13 18:05:19 -04:00
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53
include/util/kmemcpy5_func.nasm Normal file
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; Copyright (c) 2024 Elaina Claus
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in all
; copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_KMEMCPY5_FUNC
%include 'cdecl16.inc'
; uint8_t* kmemset(word dest_segment, word dest, word src_segment, word src, byte len);
; not overlap safe, only for
ALIGN 4, db 0x90
kmemcpy5:
__CDECL16_ENTRY
push ds
push es
.setup_segments
mov ax, [bp + 4]
mov ds, ax ; destination segment
mov ax, [ bp + 8]
mov es, ax ; source segment
.func:
mov cx, [bp + 12] ; len
mov si, [bp + 10] ; src
mov di, [bp + 6] ; dest
cld ; ensure we are incrementing
rep movsb ; move ds:si -> es:di
mov ax, di ; return pointer to dest
.restore_segments:
pop es
pop ds
.endf:
__CDECL16_EXIT
ret
%define __INC_KMEMCPY5_FUNC
%endif

47
include/util/kmemset4_func.nasm Normal file
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; Copyright (c) 2024 Elaina Claus
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in all
; copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_KMEMSET4_FUNC
%include 'cdecl16.inc'
; word kmemset_byte(word segment, word dst, byte val, word len);
ALIGN 4, db 0x90
kmemset4:
__CDECL16_ENTRY
.setup_segment:
push es
mov ax, [bp + 4]
mov es, ax
.func:
mov cx, [bp + 10] ; size_t len
mov al, [bp + 8] ; uint8_t val
mov di, [bp + 6] ; word dst
cld
rep stosb ; move al -> es:di
mov ax, di ; return pointer to dest
.restore_segments:
pop es
.endf:
__CDECL16_EXIT
ret
%endif
%define __INC_KMEMSET4_FUNC