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Add INT13h handling for SD Card.

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This commit is contained in:
Matthieu Bucchianeri
2025-01-18 15:55:44 -08:00
committed by Ted Fried
parent d2f95788e5
commit 1e800f94c5
7 changed files with 1628 additions and 132 deletions
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139
XTMax/Drivers/BootROM/utils.inc Normal file
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;
; Display a string.
; in: AX = string pointer
; out: AX = <TRASH>
;
print_string:
pushf
push ds
push bx
push si
mov si, ax
%ifndef AS_COM_PROGRAM
mov ax, ROM_SEGMENT
mov ds, ax
%endif
mov ah, 0xe
xor bx, bx
cld
.loop:
lodsb
or al, al
jz .done
int 0x10
jmp .loop
.done:
pop si
pop bx
pop ds
popf
ret
;
; Display a 16-bit value in hex.
; in: AX = value
; out: AX = <TRASH>
;
print_hex:
pushf
push ds
push bx
push cx
push dx
push si
mov dx, ax
%ifndef AS_COM_PROGRAM
mov ax, ROM_SEGMENT
mov ds, ax
%endif
xor bx, bx
cld
.nibble1:
mov si, dx
mov cl, 12
shr si, cl
and si, 0xf
mov al, [hex_map+si]
mov ah, 0xe
int 0x10
.nibble2:
mov si, dx
mov cl, 8
shr si, cl
and si, 0xf
mov al, [hex_map+si]
mov ah, 0xe
int 0x10
.nibble3:
mov si, dx
mov cl, 4
shr si, cl
and si, 0xf
mov al, [hex_map+si]
mov ah, 0xe
int 0x10
.nibble4:
mov si, dx
and si, 0xf
mov al, [hex_map+si]
mov ah, 0xe
int 0x10
pop si
pop dx
pop cx
pop bx
pop ds
popf
ret
hex_map db '0123456789ABCDEF'
%if %isdef(EXTRA_DEBUG) || %isdef(AS_COM_PROGRAM)
dump_regs:
push ax
mov ax, registers_msg
call print_string
pop ax
push ax
call print_hex
mov ax, space
call print_string
mov ax, bx
call print_hex
mov ax, space
call print_string
mov ax, cx
call print_hex
mov ax, space
call print_string
mov ax, dx
call print_hex
mov ax, space
call print_string
mov ax, ds
call print_hex
mov ax, space
call print_string
mov ax, si
call print_hex
mov ax, space
call print_string
mov ax, es
call print_hex
mov ax, space
call print_string
mov ax, di
call print_hex
mov ax, space
call print_string
mov ax, bp
call print_hex
mov ax, space
call print_string
mov ax, newline
call print_string
pop ax
ret
registers_msg db ' AX BX CX DX DS SI ES DI BP', 0xD, 0xA, 0
%endif