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Modified load_file to work directly from the stack

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This commit is contained in:
Xnoe 2021-08-30 07:02:01 +01:00
parent 14fcc32d79
commit df9f175662
Signed by: xnoe
GPG Key ID: 45AC398F44F0DAFE
1 changed files with 6 additions and 16 deletions
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22
kernel.asm
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@ -276,20 +276,14 @@ file_exists_found:
load_file: load_file:
push bp push bp
mov bp, sp mov bp, sp
mov ax, word [bp + 4]
mov word [_load_segment], ax
mov ax, word [bp + 6]
mov word [_load_pointer], ax
mov ax, word [bp + 8]
mov word [_load_cluster], ax
mov ax, word [_load_segment] mov ax, word [bp + 4]
mov es, ax mov es, ax
load_file_loop: load_file_loop:
mov bx, word [_load_pointer] mov bx, word [bp + 6]
mov al, byte [_load_cluster] mov al, byte [bp + 8]
add al, 34 add al, 34
mov cl, al mov cl, al
@ -301,26 +295,22 @@ load_file_loop:
int 13h int 13h
add word [_load_pointer], 512 add word [bp + 6], 512
mov si, word [_load_cluster] mov si, word [bp + 8]
shl si, 1 shl si, 1
add si, 4000h add si, 4000h
; add si, 1 ; add si, 1
cmp word [ds:si], 0ffffh cmp word [ds:si], 0ffffh
je load_file_loaded je load_file_loaded
add word [_load_cluster], 1 add word [bp + 8], 1
jmp load_file_loop jmp load_file_loop
load_file_loaded: load_file_loaded:
pop bp pop bp
ret 6 ret 6
_load_pointer dw 0
_load_cluster dw 0
_load_segment dw 0
decode_filename: decode_filename:
push bp push bp
mov bp, sp mov bp, sp