SingOS
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SLRboot
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Start to use this repo as submodule

master
Rhodez-x 7 years ago
parent
29addfee9a
commit
259be82bc8
2 changed files with 81 additions and 61 deletions
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  1. 11
      notes.txt
  2. 131
      slrboot.nasm

11
notes.txt
View File

@ -11,11 +11,18 @@
0x0017: mov cx, 0x200 0x0017: mov cx, 0x200
0x001a: rep movsb byte ptr es:[di], byte ptr [si] 0x001a: rep movsb byte ptr es:[di], byte ptr [si]
0x001c: ljmp 0:0x621 0x001c: ljmp 0:0x621
0x0021: mov si, 0x7be 0x0021: mov si, 0x7be
0x0024: cmp byte ptr [si], al 0x0024: cmp byte ptr [si], al
0x0026: jne 0x33 0x0026: jne 0x33
0x0028: add si, 0x10 0x0028: add si, 0x10
0x002b: cmp si, 0x7fe 0x002b: cmp si, 0x7fe
0x002f: jne 0x24 0x002f: jne 0x24
0x0031: jmp 0x49 0x0031: jmp 0x49
0x0033: mov ah, 2 0x0033: mov ah, 2
@ -27,3 +34,7 @@
0x0042: int 0x13 0x0042: int 0x13
0x0044: ljmp 0:0x7c00 0x0044: ljmp 0:0x7c00
0x0049: jmp 0x49 0x0049: jmp 0x49
// This is test for workshop.

131
slrboot.nasm
View File

@ -3,25 +3,28 @@ BITS 16
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; SLRboot ; SLRboot
; Bootloader for SingOS ; Bootloader for SingOS
; version 0.2.0.0-exp ; version 0.2.0.3-exp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
cli cli
mov [disk_identifier], dl jmp long 0x0000:start
start:
mov ax, 0x1000 mov ax, 0x1000
mov ss, ax mov ss, ax
mov sp, 0xb000 mov sp, 0xb000
mov ax, 0 mov ax, 0
mov ds, ax mov ds, ax
mov es, ax mov es, ax
sti mov [disk_identifier], dl
sti
mov si, 0x7c00 mov si, 0x7c00
mov di, 0x600 mov di, 0x600
mov cx, 0x200 mov cx, 0x100
rep movsb rep movsw
mov bx, relocated mov bx, relocated
sub bx, 0x7600 ; Calculate the offset. sub bx, 0x7600 ; Calculate the offset.
push bx push bx
retf ; Return far ret ; Return far
;jmp long 0:bx ;jmp long 0:bx
relocated: relocated:
@ -29,34 +32,29 @@ relocated:
mov si, message ; Put address of the null-terminated string to output into 'si' mov si, message ; Put address of the null-terminated string to output into 'si'
call print ; Call our string-printing routine call print ; Call our string-printing routine
;mov ax, 0x0050 mov bx, [partition_1.start_LBA]
;mov es, ax ;Section to write into mov WORD [DAPACK.lba_addr_dw_low], bx
;mov ah, 0x2 ;Read sectors from drive mov bx, [partition_1.start_LBA + 1]
;mov al, 0x08 ;Number of sectors to read (31 * 512 = 15872 bytes) mov WORD [DAPACK.lba_addr_dw_low + 1], bx
;mov ch, 0x0 ;Low 8 bits of cylinder mov bx, [partition_1.start_LBA + 2]
;mov cl, 0x11 ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7) mov WORD [DAPACK.lba_addr_dw_low + 2], bx
;mov dh, 0x0 ;Head number mov bx, [partition_1.start_LBA + 3]
;mov dl, [disk_identifier] ;Drive number mov WORD [DAPACK.lba_addr_dw_low + 3], bx
;mov bx, 0x0000 ;Offset into section mov WORD [DAPACK.blkcnt], 0x01
;int 0x13 ;Low level disk services mov WORD [DAPACK.db_addr_segment], 0x0000
mov ah, 2 mov WORD [DAPACK.db_addr_offset], 0x7c00
mov al, 0x08 mov si, DAPACK ; address of "disk address packet"
mov bx, 0x7c00 mov ah, 0x42 ; READ
mov BYTE dl, [disk_identifier] mov dl, [disk_identifier]
mov BYTE dh, [partition_2.start_CHS + 1] ;byte [si + 1]
mov BYTE cl, [partition_2.start_CHS + 2]
mov BYTE ch, [partition_2.start_CHS] ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
int 0x13 int 0x13
;mov ax, 0x0
;mov ds, ax
mov ax, 89 ; lba adress
jmp long 0x0:0x7c00 jmp long 0x0:0x7c00
cli cli
hlt hlt
%IF 1 %IF 0
cli cli
jmp long 0x0000:start jmp long 0x0000:start
@ -144,36 +142,37 @@ hlt
.welcome_debug db 'This is debug mode', 0 .welcome_debug db 'This is debug mode', 0
printCRLF:
mov ah, 0xE
mov al, 13
int 0x10
mov al, 10
int 0x10
ret
%ENDIF
;Routine for printing a 'ax' as hex ;Routine for printing a 'ax' as hex
dumpax: dumpax:
pusha ; save registers pusha ; save registers
mov bx, ax mov bx, ax
mov ah, 0xE ; Teletype output mov ah, 0xE ; Teletype output
mov cx, 4 ; 4 nipples in a 16 bit word mov cx, 4 ; 4 nipples in a 16 bit word
.loop: .loop:
rol bx, 4 ; rotate to next nipple rol bx, 4 ; rotate to next nipple
mov al, bl ; we copy to al because we need to mask only the low 4 bits mov al, bl ; we copy to al because we need to mask only the low 4 bits
and al, 1111b ; Do the masking and al, 1111b ; Do the masking
add al, '0' ; convert to ASCII add al, '0' ; convert to ASCII
cmp al, '9' ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A' cmp al, '9' ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A'
jbe .skip ; -|- jbe .skip ; -|-
add al, 7 ; -|- add al, 7 ; -|-
.skip: ; -|- .skip: ; -|-
int 0x10 ; BIOS call 'output' int 0x10 ; BIOS call 'output'
loop .loop loop .loop
popa ; restore registers popa ; restore registers
ret ret
printCRLF:
mov ah, 0xE
mov al, 13
int 0x10
mov al, 10
int 0x10
ret
%ENDIF
; Routine for outputting string in 'si' register to screen ; Routine for outputting string in 'si' register to screen
print: print:
mov ah, 0xE ; Specify 'int 0x10' 'teletype output' function mov ah, 0xE ; Specify 'int 0x10' 'teletype output' function
@ -188,27 +187,37 @@ jmp .printchar ; Repeat for the next character
ret ret
data: data:
message db 'SLRboot for SingOS! v0.2.0.0-exp',13,10,0 message db 'SLRboot for SingOS! v0.2.0.3-exp',13,10,0
enter_debug_mode db 'Press d to enter bootloader debug mode',13,10,0 ;enter_debug_mode db 'Press d to enter bootloader debug mode',13,10,0
enter_system_check db 'Performing system check:',13,10,0 ;enter_system_check db 'Performing system check:',13,10,0
sys_check_ok db 'System check ok', 13, 10, 0 ;sys_check_ok db 'System check ok', 13, 10, 0
boot_system db 'Read SingOS from disk', 13, 10, 0 ;boot_system db 'Read SingOS from disk', 13, 10, 0
error_str db 'Error', 0 ;error_str db 'Error', 0
success_str db 'Success', 0 ;success_str db 'Success', 0
disk_identifier db 0 disk_identifier db 0
DAPACK:
.dap_Size: db 0x10 ; This is always 16 bytes (0x10)
.rev_byte: db 0x0 ; reserved byte, should always be zero
.blkcnt: dw 0x0 ; int 13 resets this to # of blocks actually read/written
.db_addr_offset: dw 0x0 ; memory buffer destination address (0:7c00)
.db_addr_segment: dw 0x0 ; in memory page zero
.lba_addr_dw_low: dd 0x0 ; put the lba to read in this spot
.lba_addr_dw_high: dd 0x0 ; more storage bytes only for big lba's ( > 4 bytes )
; Pad to 510 bytes (boot sector size minus 2) with 0s, and finish with the two-byte standard boot signature ; Pad to 510 bytes (boot sector size minus 2) with 0s, and finish with the two-byte standard boot signature
times 446-($-$$) db 0 ; First partion entry times 446-($-$$) db 0 ; First partion entry
partition_1: partition_1:
.active_partition db 0x00 .active_partition db 0x80
.start_CHS db 0x00, 0x00, 0x11;0x20, 0x21, 0x00 .start_CHS db 0x00, 0x00, 0x11;0x20, 0x21, 0x00
.disk_type db 0x83 .disk_type db 0x83
.end_CHS db 0x8C, 0x3D, 0x0F .end_CHS db 0x8C, 0x3D, 0x0F
.start_LBA db 0x00, 0x08, 0x00, 0x00 .start_LBA db 0x10, 0x00, 0x00, 0x00
.size db 0x00, 0xC8, 0x03, 0x00 .size db 0x00, 0xC8, 0x03, 0x00
partition_2: partition_2:
.active_partition db 0x80 .active_partition db 0x00
.start_CHS db 0x8C, 0x3E, 0x0F .start_CHS db 0x8C, 0x3E, 0x0F
.disk_type db 0x83 .disk_type db 0x83
.end_CHS db 0xFF, 0xFF, 0xFF .end_CHS db 0xFF, 0xFF, 0xFF

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