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How can I get user input in my assembly bootloader?
How can I safely create a nested directory?Assembly: Using the Data Segment Register (DS)Using Jump and Compare in Assembly LanguageGetting a string to print via bios interruptShould I normalize the signs of my input when computing the average?Am I using the source index (si) correctly?Concatenate two given strings in 8086 + MOVSB does not workSnake Assembly 8086: not moving correctlySnake Game Assembly: increasing body length not workingHow to determine whether the computer has an XT/AT keyboard in assembly?
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I'm working on a assembly bootloader. I need help with getting input from the user. I use such code to print on the screen (in start). In getInput, I tried to get input from user but has not been worked. So, how could I do it?
org 0x7C00
BITS 16
start:
cli ; Disable interrupts
mov si, bootMsg1 ; Point SI to message
mov ah, 0x0E ; Indicate BIOS we're going to print chars
.loop lodsb ; Loads SI to AL
or al,al ; Checks if the end of string
jz seperate
or al,al
jz halt ; Jump to halt at the end
int 0x10 ; Otherwise, call interrupt for printing the char
jmp .loop ; Next iteration of loop
...
getInput:
cli
mov ah, 08 ; Indicate BIOS to get input
int 21h
mov ah,02
mov DL,AL
int 21h
MOV AH,4Ch ; Function to exit
MOV AL,00 ; Return 00
INT 21h
halt: hlt ; CPU command to halt the execution
bootMsg1: db "Slight Bootloader 1, Welcome!",13,10 ; Message
bootMsg2: db"------------",13,10
assembly operating-system kernel boot
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
add a comment |
I'm working on a assembly bootloader. I need help with getting input from the user. I use such code to print on the screen (in start). In getInput, I tried to get input from user but has not been worked. So, how could I do it?
org 0x7C00
BITS 16
start:
cli ; Disable interrupts
mov si, bootMsg1 ; Point SI to message
mov ah, 0x0E ; Indicate BIOS we're going to print chars
.loop lodsb ; Loads SI to AL
or al,al ; Checks if the end of string
jz seperate
or al,al
jz halt ; Jump to halt at the end
int 0x10 ; Otherwise, call interrupt for printing the char
jmp .loop ; Next iteration of loop
...
getInput:
cli
mov ah, 08 ; Indicate BIOS to get input
int 21h
mov ah,02
mov DL,AL
int 21h
MOV AH,4Ch ; Function to exit
MOV AL,00 ; Return 00
INT 21h
halt: hlt ; CPU command to halt the execution
bootMsg1: db "Slight Bootloader 1, Welcome!",13,10 ; Message
bootMsg2: db"------------",13,10
assembly operating-system kernel boot
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
2
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47
add a comment |
I'm working on a assembly bootloader. I need help with getting input from the user. I use such code to print on the screen (in start). In getInput, I tried to get input from user but has not been worked. So, how could I do it?
org 0x7C00
BITS 16
start:
cli ; Disable interrupts
mov si, bootMsg1 ; Point SI to message
mov ah, 0x0E ; Indicate BIOS we're going to print chars
.loop lodsb ; Loads SI to AL
or al,al ; Checks if the end of string
jz seperate
or al,al
jz halt ; Jump to halt at the end
int 0x10 ; Otherwise, call interrupt for printing the char
jmp .loop ; Next iteration of loop
...
getInput:
cli
mov ah, 08 ; Indicate BIOS to get input
int 21h
mov ah,02
mov DL,AL
int 21h
MOV AH,4Ch ; Function to exit
MOV AL,00 ; Return 00
INT 21h
halt: hlt ; CPU command to halt the execution
bootMsg1: db "Slight Bootloader 1, Welcome!",13,10 ; Message
bootMsg2: db"------------",13,10
assembly operating-system kernel boot
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
I'm working on a assembly bootloader. I need help with getting input from the user. I use such code to print on the screen (in start). In getInput, I tried to get input from user but has not been worked. So, how could I do it?
org 0x7C00
BITS 16
start:
cli ; Disable interrupts
mov si, bootMsg1 ; Point SI to message
mov ah, 0x0E ; Indicate BIOS we're going to print chars
.loop lodsb ; Loads SI to AL
or al,al ; Checks if the end of string
jz seperate
or al,al
jz halt ; Jump to halt at the end
int 0x10 ; Otherwise, call interrupt for printing the char
jmp .loop ; Next iteration of loop
...
getInput:
cli
mov ah, 08 ; Indicate BIOS to get input
int 21h
mov ah,02
mov DL,AL
int 21h
MOV AH,4Ch ; Function to exit
MOV AL,00 ; Return 00
INT 21h
halt: hlt ; CPU command to halt the execution
bootMsg1: db "Slight Bootloader 1, Welcome!",13,10 ; Message
bootMsg2: db"------------",13,10
assembly operating-system kernel boot
assembly operating-system kernel boot
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
edited Mar 24 at 17:07
Burak Yeniçeri
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
asked Dec 21 '18 at 10:10
Burak YeniçeriBurak Yeniçeri
5611
5611
2
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47
add a comment |
2
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47
2
2
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47
add a comment |
1 Answer
1
active
oldest
votes
Use Int 16h/AH=00h.
Some output as Int 21h/AH=08h.
Int 16h has input utilities, Int 10h has output (video) utilities.
Example.
Wait for the user to press a key and then "reboot".
BITS 16
xor ax, ax
int 16h
int 19h
TIMES 510 - ($-$$) db 0
dw 0aa55h
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrateint 16h/ah=00hworks.
– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeriint 16h/ah=00hreturns inaxthe scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.
– Margaret Bloom
Mar 17 at 13:09
|
show 7 more comments
Your Answer
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use Int 16h/AH=00h.
Some output as Int 21h/AH=08h.
Int 16h has input utilities, Int 10h has output (video) utilities.
Example.
Wait for the user to press a key and then "reboot".
BITS 16
xor ax, ax
int 16h
int 19h
TIMES 510 - ($-$$) db 0
dw 0aa55h
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrateint 16h/ah=00hworks.
– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeriint 16h/ah=00hreturns inaxthe scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.
– Margaret Bloom
Mar 17 at 13:09
|
show 7 more comments
Use Int 16h/AH=00h.
Some output as Int 21h/AH=08h.
Int 16h has input utilities, Int 10h has output (video) utilities.
Example.
Wait for the user to press a key and then "reboot".
BITS 16
xor ax, ax
int 16h
int 19h
TIMES 510 - ($-$$) db 0
dw 0aa55h
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrateint 16h/ah=00hworks.
– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeriint 16h/ah=00hreturns inaxthe scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.
– Margaret Bloom
Mar 17 at 13:09
|
show 7 more comments
Use Int 16h/AH=00h.
Some output as Int 21h/AH=08h.
Int 16h has input utilities, Int 10h has output (video) utilities.
Example.
Wait for the user to press a key and then "reboot".
BITS 16
xor ax, ax
int 16h
int 19h
TIMES 510 - ($-$$) db 0
dw 0aa55h
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
Use Int 16h/AH=00h.
Some output as Int 21h/AH=08h.
Int 16h has input utilities, Int 10h has output (video) utilities.
Example.
Wait for the user to press a key and then "reboot".
BITS 16
xor ax, ax
int 16h
int 19h
TIMES 510 - ($-$$) db 0
dw 0aa55h
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
edited Dec 23 '18 at 18:29
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
answered Dec 21 '18 at 10:47
Margaret BloomMargaret Bloom
23.5k53271
23.5k53271
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrateint 16h/ah=00hworks.
– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeriint 16h/ah=00hreturns inaxthe scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.
– Margaret Bloom
Mar 17 at 13:09
|
show 7 more comments
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrateint 16h/ah=00hworks.
– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeriint 16h/ah=00hreturns inaxthe scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.
– Margaret Bloom
Mar 17 at 13:09
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Didn't work, how can I do it? Nothing happened again. Can you show me an example?
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
Note: I use VirtualBox o test and I captured keyboard/mouse with guest(so bootloader)
– Burak Yeniçeri
Dec 22 '18 at 16:30
2
2
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrate
int 16h/ah=00h works.– Margaret Bloom
Dec 23 '18 at 18:31
@BurakYeniçeri See the updated answer for a minimal example. Tested with VirtualBox. Remember to setup your booting environment correctly, the example is only mean to demonstrate
int 16h/ah=00h works.– Margaret Bloom
Dec 23 '18 at 18:31
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
I need another thing. I need to get which key did the user press. How can I get it as a string value?
– Burak Yeniçeri
Mar 16 at 15:42
@BurakYeniçeri
int 16h/ah=00h returns in ax the scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.– Margaret Bloom
Mar 17 at 13:09
@BurakYeniçeri
int 16h/ah=00h returns in ax the scancode of the key and its translation in ASCII according to the bios keyboard layout. If you search this site you'll find plenty of examples.– Margaret Bloom
Mar 17 at 13:09
|
show 7 more comments
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2
Int 21h is a DOS interrupt, which is only available if you run DOS. In a bootloader you are restricted to BIOS interrupts. See Ralf Brown's Interrupt List for a better approach.
– zx485
Dec 21 '18 at 10:27
If you are new to assembly, it might be easier to start with writing DOS programs because the API is richer and because the environment has less restrictions.
– fuz
Dec 21 '18 at 11:47