diff options
| author | Brett Weiland <brett_weiland@bpcspace.com> | 2021-03-24 15:36:54 -0500 |
|---|---|---|
| committer | Brett Weiland <brett_weiland@bpcspace.com> | 2021-03-24 15:38:09 -0500 |
| commit | 14b109ea24dc5cb1db948de57a2a44c80ef4622e (patch) | |
| tree | e397997d9c8d9c1b50a5a5235d38c6b0e8f24b5b /src/bootloader/bios_functions | |
| parent | 13000d6f44d66da795e92e4b2ddc37ce879bf275 (diff) | |
modified: README.md
modified: compiler/create_crosscompiler.sh
deleted: notes
modified: src/.gdb_history
deleted: src/amd64_vol2.pdf
modified: src/bootloader/bios_functions/bios_disk.asm
modified: src/bootloader/bios_functions/print.asm
modified: src/bootloader/bootloader.asm
modified: src/bootloader/cpu_check.asm
modified: src/bootloader/enter_kernel.asm
deleted: src/bootloader/enter_kernel_backup
modified: src/bootloader/gdt.asm
deleted: src/bootloader/multicore.asm
deleted: src/bootloader/notes
new file: src/debug/gdbinit.gdb
deleted: src/indigo_os
modified: src/kernel/include/libc.h
modified: src/kernel/include/paging.h
modified: src/kernel/include/video.h
modified: src/kernel/kernel.c
modified: src/kernel/libs/acpi.c
modified: src/kernel/libs/drivers/serial.c
modified: src/kernel/libs/drivers/video.c
modified: src/kernel/libs/libc.c
modified: src/kernel/libs/page.c
modified: src/link.ld
modified: src/makefile
new file: tools/README.md
modified: tools/page/page.py
Diffstat (limited to 'src/bootloader/bios_functions')
| -rw-r--r-- | src/bootloader/bios_functions/bios_disk.asm | 2 | ||||
| -rw-r--r-- | src/bootloader/bios_functions/print.asm | 29 |
2 files changed, 16 insertions, 15 deletions
diff --git a/src/bootloader/bios_functions/bios_disk.asm b/src/bootloader/bios_functions/bios_disk.asm index 28fc74d..7957814 100644 --- a/src/bootloader/bios_functions/bios_disk.asm +++ b/src/bootloader/bios_functions/bios_disk.asm @@ -3,6 +3,8 @@ bios_disk: pusha mov es, dx +; TODO when our kernel gets to big to fit in one track, we need to just switch over to LHS with extended bios functions. + mov ah, 0x02 ; read disc sectors mov ch, 0x00 ; track 0 mov dh, 0x00 ; head 0 diff --git a/src/bootloader/bios_functions/print.asm b/src/bootloader/bios_functions/print.asm index d071cd9..303fa8f 100644 --- a/src/bootloader/bios_functions/print.asm +++ b/src/bootloader/bios_functions/print.asm @@ -1,25 +1,24 @@ -;TODO fix null problem, allow direct passes +;TODO fix null problem, allow passing value insted of pointer bios_print: -;push ax ; we need to use ax, so let's push it in case whoever called needs it pusha -mov ah, 0x0e ; tells bios we're in tty mode +mov ah, 0x0e .print_loop: -mov al, [bx] ; al is the char MEANT TO BE CX -cmp al, 0 ; compare the char we're about to print with null -je .fini ; if it is null, we gonna scoot the fuck outta here +mov al, [bx] +cmp al, 0 +je .fini test cx, cx ; if cx is zero, ascii, otherwise hex string jne .print_hex -int 0x10 ; bios call, actually prints the char +int 0x10 .print_hex_ret: -inc bx ; adds to the pointer -jmp .print_loop ; goes back to loop start +inc bx +jmp .print_loop .fini: -mov al, 0xd ; \r +mov al, 0xd int 0x10 -mov al, 0xa ; \n +mov al, 0xa int 0x10 popa ret @@ -32,7 +31,7 @@ int 0x10 mov al, 'x' int 0x10 -mov al, [bx] ; shift bits to get first nibble +mov al, [bx] shr al, 4 call .bios_print_nibble @@ -47,13 +46,13 @@ jmp .print_hex_ret .bios_print_nibble: -cmp al, 9 ; see if letter worthy +cmp al, 9 ja .print_hex_letter -add al, 0x30 ;'1' +add al, 0x30 int 0x10 ret .print_hex_letter: -add al, 0x57 ;'a' +add al, 0x57 int 0x10 ret |