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| .vscode/*** | ||
| *.o | ||
| *.s_o | ||
| *.o | ||
| *.img | ||
| *.sys | ||
| *.bin |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,25 @@ | ||
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| This is free and unencumbered software released into the public domain. | ||
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| Anyone is free to copy, modify, publish, use, compile, sell, or | ||
| distribute this software, either in source code form or as a compiled | ||
| binary, for any purpose, commercial or non-commercial, and by any | ||
| means. | ||
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| In jurisdictions that recognize copyright laws, the author or authors | ||
| of this software dedicate any and all copyright interest in the | ||
| software to the public domain. We make this dedication for the benefit | ||
| of the public at large and to the detriment of our heirs and | ||
| successors. We intend this dedication to be an overt act of | ||
| relinquishment in perpetuity of all present and future rights to this | ||
| software under copyright law. | ||
|
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| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR | ||
| OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | ||
| ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| OTHER DEALINGS IN THE SOFTWARE. | ||
|
|
||
| For more information, please refer to <http://unlicense.org/> |
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| Original file line number | Diff line number | Diff line change |
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| .code16 | ||
| .global _entry | ||
| .section .text | ||
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| _entry: | ||
| jmp _start | ||
| nop | ||
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| # | ||
| # Low Performance File System (LPFS) header | ||
| # | ||
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| _disk_volume_label: .asciz "OPERATING SYSTEM/1 SYSTEM DISK" # 31chars (+1 for '\0') | ||
| _disk_sector_size: .word 512 # Define a size of a sector in bytes | ||
| _maximal_dir_size: .word 1024 # Maximum directory size of 1024KiB (~1MB) | ||
| _minimum_dir_size: .word 1 # Minimum directory size of 1KiB | ||
| _minimal_file_size: .word 1 # Minimum file size of 1KiB (1024 bytes - 2 sectors) | ||
| _maximum_file_size: .word 18 # Maximum file size of 18KiB (16384 bytes - 2 tracks [18 sectors per track]) | ||
| _disk_id_number: .byte 79, 83, 47, 49, 20, 86, 54, 46, 48, 46, 48, 20 # 12 byte disk id nubmer | ||
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| # | ||
| # Main function of the bootloader | ||
| # | ||
| _start: | ||
| # save the boot device | ||
| movb %dl, _boot_dev | ||
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| # clear scr. | ||
| mov $0x03, %ax | ||
| int $0x10 | ||
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| # Set pallete register | ||
| mov $0x1003, %ax | ||
| mov $0x00, %bl | ||
| int $0x10 | ||
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| # Set up the font | ||
| mov $0x11, %ah | ||
| mov $0x11, %al | ||
| int $0x10 | ||
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| # Stack | ||
| cli | ||
| mov $0x9000,%ax | ||
| mov %ax, %ss | ||
| mov $0xF800,%sp | ||
| sti | ||
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| # boot message | ||
| mov $_msg_0, %si | ||
| call _print | ||
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| # | ||
| # Check for kernel file | ||
| # | ||
| # like dos' io.sys the | ||
| # kernel also needs to | ||
| # be on a specific disk | ||
| # position | ||
| # | ||
| _check_file: | ||
| mov $_msg_1,%si | ||
| call _print | ||
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| xor %ax, %ax | ||
| mov %ax, %es | ||
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| mov $0x02, %ah | ||
| mov $0x01, %al # Load 32 sectors (16KiB) of data | ||
| mov $0x0500, %bx # to address 0x0500 | ||
| mov $0x00, %ch | ||
| mov $0x02, %cl # starting from the 2nd sector | ||
| mov $0x00, %dh | ||
| movb (_boot_dev),%dl # on the boot device | ||
| int $0x13 | ||
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| xor %ax, %ax | ||
| xor %cx, %cx | ||
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| mov $0x0500, %si | ||
| mov $_file_name,%di | ||
| mov $16, %cx | ||
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| _check_loop: | ||
| movsb | ||
| loop _check_loop | ||
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| mov $0x00, %al | ||
| stosb | ||
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| mov $_file_name,%si | ||
| mov $_file, %di | ||
| call _strcmp | ||
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| jc _load_file | ||
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| mov $_err2, %si | ||
| call _print | ||
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| jmp _end | ||
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| # | ||
| # Load the kernel file to (phys. mem.) 0x0500 | ||
| # | ||
| _load_file: | ||
| mov $_msg_2,%si | ||
| call _print | ||
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| xor %ax, %ax | ||
| mov %ax, %es | ||
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| mov $0x02, %ah | ||
| mov $0x20, %al # Load 32 sectors (16KiB) of data | ||
| mov $0x0500, %bx # to address 0x0500 | ||
| mov $0x00, %ch | ||
| mov $0x02, %cl # starting from the 2nd sector | ||
| mov $0x00, %dh | ||
| movb (_boot_dev),%dl # on the boot device | ||
| int $0x13 | ||
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| jc _disk_error | ||
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| mov $_start_k, %si | ||
| call _print | ||
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| jmp 0x0500 | ||
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| # | ||
| # Clear ints. and halt | ||
| # | ||
| _end: | ||
| cli | ||
| hlt | ||
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| # | ||
| # If a int 0x13 carry flag is set jump heres | ||
| # | ||
| _disk_error: | ||
| mov $_err, %si | ||
| call _print | ||
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| xor %ax, %ax | ||
| int $0x16 | ||
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| int $0x19 | ||
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| # | ||
| # Cannot find kernel file | ||
| # | ||
| _no_kernel: | ||
| mov $_err2, %si | ||
| call _print | ||
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| xor %ax, %ax | ||
| int $0x16 | ||
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| int $0x19 | ||
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| # | ||
| # Prints out string stored in %si | ||
| # | ||
| _print: | ||
| lodsb | ||
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| or %al, %al | ||
| jz .p_done | ||
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| mov $0x0e, %ah | ||
| int $0x10 | ||
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| jmp _print | ||
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| .p_done: | ||
| ret | ||
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| # | ||
| # Compare a string in %si with a string in %di | ||
| # | ||
| _strcmp: | ||
| _str_loop: | ||
| mov (%si), %al | ||
| mov (%di), %bl | ||
| cmp %bl, %al | ||
| jne _not_equal | ||
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| cmp $0x00, %al | ||
| je _equal | ||
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| inc %di | ||
| inc %si | ||
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| jmp _str_loop | ||
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| _not_equal: | ||
| clc | ||
| ret | ||
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| _equal: | ||
| stc | ||
| ret | ||
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| # | ||
| # Variables | ||
| # | ||
| .section .rodata | ||
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| _msg_0: .asciz "\xDB\xDB\xDB OS/1\n\r" | ||
| _msg_1: .asciz "Searching for the kernel file...\n\r" | ||
| _msg_2: .asciz "Loading the kernel file...\n\r" | ||
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| _err: .asciz "Disk read error\n\rAny key to reboot" | ||
| _err2: .asciz "Cannot find the kernel file on the required locaton\r\nAny key to reboot" | ||
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| _start_k: .asciz "Starting OS/1...\r\n" | ||
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| _file: .asciz "KERNEL-6-0-0.SYS" # The file we are looking for | ||
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| .section .data16 | ||
| _boot_dev: .byte 0 | ||
| _file_name: .fill 16,1,0 # 12 char file name + 1 char for . + 3 chars for file exst. |
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