mirror of
https://github.com/gbowne1/ClassicOS.git
synced 2024-11-25 07:06:52 -08:00
Added a secondary stage bootloader.
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parent
cd323834ff
commit
61776524a9
@ -5,6 +5,7 @@ set(CMAKE_BINARY_DIR ${CMAKE_CURRENT_LIST_DIR}/build)
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include(x86-baremetal-toolchain.cmake)
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project(ClassicOSBL VERSION 0.0.1 LANGUAGES ASM_NASM)
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project(ClassicOS VERSION 0.0.1 LANGUAGES C CXX ASM_NASM)
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set(IS_OS_WINDOWS FALSE)
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@ -28,12 +29,10 @@ set(BOOT_SOURCE_FILES
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src/boot/linker.ld
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)
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#[[
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set(GRUB_SOURCE_FILES
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src/boot/grub/grub.cfg
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src/boot/grub/menu.lst
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)
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]]
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set(DRIVERS_SOURCE_FILES
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src/drivers/audio/audio.c
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@ -111,18 +110,13 @@ set(UTIL_SOURCE_FILES
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)
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add_executable(ClassicOS
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${GRUB_SOURCE_FILES}
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${KERNEL_SOURCE_FILES}
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${DRIVERS_SOURCE_FILES}
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)
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if (IS_OS_LINUX)
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
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set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -f elf")
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set(CMAKE_EXE_LINKER_FLAGS "-g -s")
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set(CMAKE_LINK_FLAGS "${CMAKE_LINK_FLAGS} -e kernel_main")
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add_executable(ClassicOSBL
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${BOOT_SOURCE_FILES}
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${GRUB_SOURCE_FILES}
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)
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#set_target_properties(ClassicOS PROPERTIES LINK_FLAGS "-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld")
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elseif (IS_OS_WINDOWS)
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set(CMAKE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} -f win32")
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endif ()
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message("${CMAKE_EXE_LINKER_FLAGS}")
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@ -1,112 +1,87 @@
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[BITS 16]
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[ORG 0x7c00]
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; Set up the segment registers
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xor ax, ax
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mov ds, ax
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mov es, ax
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start:
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XOR AX, AX
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MOV DS, AX
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MOV SS, AX
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MOV SP, 0x7c00
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; Set up stack and jump to main
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mov ss, ax
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mov sp, 0x7c00
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jmp main
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MOV SI, loading
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CALL printnl
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; Print 'Booting ClassicOS!' to the screen
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print:
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mov si, message
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mov ah, 0x0e
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.loop:
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lodsb
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test al, al
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jz .done
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int 0x10
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jmp .loop
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.done:
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ret
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CALL reset_drives
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CALL read_drive
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; Set the video mode to a 40 column text mode
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set_video_mode:
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mov ax, 0x0003 ; Set up a 80x25 text mode
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int 0x10
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MOV SI, loadedSS
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CALL printnl
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; Set the number of columns to 40
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mov ax, 0x1112
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mov bx, 0x0007
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int 0x10
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JMP 0x1000:0x0000
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ret
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RET
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; Detect floppy disk drive
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detect_disk:
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mov ah, 0x08
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int 0x13
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cmp ah, 0
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jne .error
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ret
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printnl:
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LODSB
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OR AL, AL
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JZ .stop
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.error:
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; Handle disk detection error
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; Display error message or take appropriate action
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ret
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MOV AH, 0x0E
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MOV BH, 0x00
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MOV BL, 0x07
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INT 0x10
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; Read sectors from floppy disk
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read_sectors:
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mov ah, 0x02
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mov al, 1 ; Number of sectors to read
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mov ch, 0 ; Cylinder/Track number
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mov cl, 2 ; Sector number (starting from 1)
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mov dh, 0 ; Head number
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mov dl, 0 ; Drive number (0 for floppy disk)
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JMP printnl
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mov bx, buffer ; Destination buffer
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mov es, bx
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xor bx, bx
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.stop:
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MOV AH, 0x03 ; AH = 0x03 (Get Cursor Position and Shape)
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XOR BH, BH ; BH = 0x00 (Video Page Number)
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INT 0x10 ; Call video interrupt
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int 0x13
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INC DH
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jc .error ; Check carry flag for error
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ret
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MOV AH, 0x02 ; Set cursor position
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XOR BH, BH ; Page number
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XOR DL, DL ; Column (start from 0)
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INT 0x10 ; Call video interrupt
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RET
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.error:
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; Handle read error
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; Display error message or take appropriate action
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ret
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reset_drives:
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XOR AH, AH ; 0 = Reset floppy disk
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INT 0x13
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JC .reset_error ; If carry flag was set, try again
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RET
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; Bootloader entry point
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main:
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; Call the set_video_mode function
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call set_video_mode
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.reset_error:
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MOV SI, resetError
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CALL printnl
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RET
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; Clear the screen
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mov ah, 0x06
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mov al, 0
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xor bx, bx
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xor cx, cx
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mov dh, 24
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mov dl, 39
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int 0x10
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read_drive:
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MOV AH, 0x02
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MOV AL, 1 ; Number of sectors to read
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XOR CH, CH ; Cylinder/Track number
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MOV CL, 2 ; Sector number (starting from 1)
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XOR DH, DH ; Head number
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XOR DL, DL ; Drive number (0x0 for floppy disk / 0x80 for hard disk)
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; Call the print function
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call print
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MOV BX, 0x1000
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MOV ES, BX
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XOR BX, BX
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; Wait for a key press to exit the loop
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mov ah, 0x00
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int 0x16
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INT 0x13
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; Call the detect_disk function
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call detect_disk
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JC .read_error
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RET
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; Call the read_sectors function
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call read_sectors
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.read_error:
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MOV SI, readError
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CALL printnl
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RET
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; Infinite loop
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.loop:
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jmp .loop
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; Message to print
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message db 'Booting ClassicOS!', 0
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; Buffer to store read sectors
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buffer times 512 db 0
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loading db "Loading Second Stage", 0
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resetError db "Failed to reset drives.", 0
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readError db "Failed to read drive", 0
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loadedSS db "Loaded second stage...", 0
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times 510-($-$$) db 0
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dw 0xaa55
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43
src/boot/boot2.asm
Normal file
43
src/boot/boot2.asm
Normal file
@ -0,0 +1,43 @@
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[BITS 16]
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[ORG 0x0000]
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start:
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MOV AX, CS
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MOV DS, AX
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MOV SS, AX
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MOV SP, 0xFFFF
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MOV SI, msg
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JMP println
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JMP $
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RET
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println:
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.next_char:
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LODSB
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OR AL, AL
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JZ .stop
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MOV AH, 0x0E
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MOV BH, 0x00
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MOV BL, 0x07
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INT 0x10
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JMP .next_char
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.stop:
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MOV AH, 0x03 ; AH = 0x03 (Get Cursor Position and Shape)
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XOR BH, BH ; BH = 0x00 (Video Page Number)
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INT 0x10 ; Call video interrupt
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INC DH
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MOV AH, 0x02 ; Set cursor position
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XOR BH, BH ; Page number
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XOR DL, DL ; Column (start from 0)
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INT 0x10 ; Call video interrupt
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RET
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msg db "Second stage loaded, and Gbowne1 stinks.", 0
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@ -1,21 +1,33 @@
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ENTRY(kernel_main)
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SECTIONS {
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. = 0x100000;
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.text : {
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*(.text)
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}
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.rodata : {
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*(.rodata)
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}
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.data : {
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*(.data)
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}
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.bss : {
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*(.bss)
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}
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PHDRS {
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headers PT_PHDR PHDRS ;
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text_seg PT_LOAD FLAGS(5); /* Read and Execute */
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data_seg PT_LOAD FLAGS(6); /* Read and Write */
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}
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SECTIONS {
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. = 0xC0000000; /* Starting virtual address */
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/* Text Section */
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.text : AT(ADDR(.text) - 0xC0000000)
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{
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*(.text)
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} :text_seg
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. = ALIGN(4096); /* Align to page boundary */
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/* Data Section */
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.data : AT(ADDR(.data) - 0xC0000000)
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{
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*(.data)
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} :data_seg
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. = ALIGN(4096); /* Align to page boundary */
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/* BSS Section */
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.bss : AT(ADDR(.bss) - 0xC0000000)
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{
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*(.bss)
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} :data_seg /* Use the same segment as .data */
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}
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@ -12,4 +12,4 @@ set(CMAKE_CXX_STANDARD 20)
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set(CMAKE_ASM_NASM_FLAGS "-f elf32")
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set(CMAKE_C_FLAGS "-m32 -ffreestanding -nostdlib")
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set(CMAKE_CXX_FLAGS "-m32 -ffreestanding -nostdlib")
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set(CMAKE_EXE_LINKER_FLAGS "-T${CMAKE_CURRENT_LIST_DIR}/linker.ld -m32")
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set(CMAKE_EXE_LINKER_FLAGS "-e kernel_main -T${CMAKE_CURRENT_LIST_DIR}/linker.ld -m32 -z noexecstack")
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