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use bx addressing in read_disk_raw

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This commit is contained in:
Elaina Claus
2024-10-13 20:51:16 -04:00
parent 7617b11199
commit cd833184da
1 changed files with 13 additions and 17 deletions
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26
include/BIOS/func/ext_read.nasm
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@@ -83,37 +83,33 @@ ALIGN 4, db 0x90
read_disk_raw:
__CDECL16_ENTRY
.func:
mov ax, 0x10
push ax ; len = 16 bytes
mov ax, LBAPkt_t_size
push ax ; len
xor ax, ax
push ax ; val = 0
mov ax, lba_packet
mov bx, ax
push ax ; dest = lba_packet address
call kmemset
add sp, 0x06
mov byte [lba_packet + LBAPkt_t.size], 0x10
mov byte [bx + LBAPkt_t.size], 0x10
mov ax, [bp + 12]
mov word [lba_packet + LBAPkt_t.xfer_size], ax
mov word [bx + LBAPkt_t.xfer_size], ax
mov eax, [bp + 8]
mov dword [lba_packet + LBAPkt_t.lower_lba], eax
mov dword [bx + LBAPkt_t.lower_lba], eax
mov ax, [bp + 6]
mov word [lba_packet + LBAPkt_t.offset], ax
mov word [bx + LBAPkt_t.offset], ax
mov ax, [bp + 4]
mov word [lba_packet + LBAPkt_t.segment], ax
mov word [bx + LBAPkt_t.segment], ax
mov si, lba_packet
mov ah, 0x42
;BUG: still working on getting this passed down correctly, going to hard set it for now.
movzx dx, byte [bp + 14]
and dx, 0x00ff
;xor dl, dl
;mov dl, 0x80
mov si, bx ; ds:si LBAPkt_t
mov ah, 0x42 ; call #
mov dl, byte [bp + 14] ; drive #
int 0x13
jnc .endf