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Bootloader: Add helpers for printing n bit hexadecimal numbers

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Bananymous 2023-11-16 13:30:01 +02:00
parent 9d4101e0c5
commit b371abade5
1 changed files with 62 additions and 0 deletions
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62
bootloader/utils.S
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@ -196,6 +196,68 @@ print_number:
popa
ret
# prints 8 bit hexadecimal number to screen
# al: number to print
.global print_hex8
print_hex8:
pushw %ax
pushw %bx
pushw %cx
movw $16, %bx
movw $2, %cx
andw $0xFF, %ax
call print_number
popw %cx
popw %bx
popw %ax
ret
# prints 16 bit hexadecimal number to screen
# ax: number to print
.global print_hex16
print_hex16:
pushw %bx
pushw %cx
movw $16, %bx
movw $4, %cx
call print_number
popw %cx
popw %bx
ret
# prints 32 bit hexadecimal number to screen
# eax: number to print
.global print_hex32
print_hex32:
pushl %eax
pushw %dx
movw %ax, %dx
shrl $16, %eax;
call print_hex16
movw %dx, %ax
call print_hex16
popw %dx
popl %eax
ret
# prints 64 bit hexadecimal number to screen
# edx:eax: number to print
.global print_hex64
print_hex64:
xchgl %eax, %edx
call print_hex32
xchgl %eax, %edx
call print_hex32
ret
# test if character is printable ascii
# al: character to test
# return: