53 lines
1.6 KiB
NASM
53 lines
1.6 KiB
NASM
; 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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%ifndef __INC_KMEM_FUNC
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%include 'cdecl16.inc'
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; void* kmemset_byte(void* dst, uint8_t val, uint16_t len);
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ALIGN 4, db 0x90
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kmemset:
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__CDECL16_ENTRY
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.func:
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mov cx, [bp + 8] ; uint16_t len
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mov al, byte [bp + 6] ; uint8_t val
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mov di, [bp + 4] ; void * dst
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cld
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rep stosb
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mov ax, di ; return pointer to dest + len (last elem of dest)
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.endp:
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__CDECL16_EXIT
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ret
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; uint8_t* kmemset(uint16_t* dest, uint16_t* src, uint16_t len);
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; not overlap safe
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ALIGN 4, db 0x90
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kmemcpy:
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__CDECL16_ENTRY
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.func:
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mov cx, [bp + 8] ; len
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mov si, [bp + 6] ; src
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mov di, [bp + 4] ; dest
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cld ; ensure we are incrementing
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rep movsb
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mov ax, di ; return pointer to dest
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.endf:
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__CDECL16_EXIT
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ret
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%endif
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%define __INC_KMEM_FUNC |