我无法从汇编代码转换为C.我以某种方式加载我的内核，将其放在第二阶段引导加载程序中的填充之后，并增加第一阶段引导加载程序中要加载的扇区数。正如你在这里看到的那样：
boot1.asm：
;----------------------------------------------;
;
; The BoneOS Stage 1 Bootloader
; -----------------------------
;
;
; Contributors : @amanuel2
;
;
;----------------------------------------------;
[ORG 0x7c00] ;We Will Set Registers to point to 0x7C00 Later
[ BITS 16 ]; 16 bits real mode
JMP main_first ; Jump to Main Function of the Bootloader
;/////////////////////////////////////////////
; Include Files
;////////////////////////////////////////////
;--------------------------------------
; STDIO.h
; I/O Functions. Such as printfb which
; prints a string to the screen.
;
; @functions:
; printfb ARGS: <SI = String>
; printfbln ARGS: <SI = String>
; clearscreen
; print_new_line
;--------------------------------------
%include "stdiobios.inc"
;-----------------------------------------------
;-----------------------------------------------
; Label "Function" Main Declarations :)
;
; Bone Project
;----------------------------------------------
;----------------------------------------------
; Label "Variable" Main Declaractions :)
;
; Bone Project
;----------------------------------------------
FirstMessageExecution : db "Stage 1 Bootloader Executing . . .", 0
SECONDSTAGEXECUTION : db "Stage 2 Bootloader Executing . . .",0
;align 4
gdt_start: ; Start of global descriptor table
gdt_null: ; Null descriptor chunk
dd 0x00
dd 0x00
gdt_code: ; Code descriptor chunk
dw 0xFFFF
dw 0x0000
db 0x00
db 0x9A
db 0xCF
db 0x00
gdt_data: ; Data descriptor chunk
dw 0xFFFF
dw 0x0000
db 0x00
db 0x92
db 0xCF
db 0x00
gdt_end: ; Bottom of table
gdt_descriptor: ; Table descriptor
dw gdt_end - gdt_start - 1 ; Size of table
dd gdt_start ; Start point of table
gdt_codeSeg equ gdt_code - gdt_start ; Offset of code segment from start
gdt_dataSeg equ gdt_data - gdt_start ; Offset of data segment from start
a20wait:
in al,0x64 ; input from 0x64 port, goes to al register
test al,2 ; compares al register with 2
jnz a20wait ; If it is zero loop again
ret
a20wait2:
in al,0x64 ; input from 0x64 port, goes to al register
test al,1 ; compares al register with 2
jz a20wait2 ; If it is zero loop again
ret
;----- -----;
;----- Main Function -----;
;----- -----;
main_first:
CLI ; Clear Interupts Before Manupulating Segments
;------------------------------
; Bootloader Repsonsibility To
; Setup Registers to point to our
; Segments (Except Code Segment)
;
;------------------------------
SEGMENTS:
; 0x0000 : 0x7c00
xor ax,ax ; 0x0000
MOV ds,ax ; Data Segment
MOV es,ax ; Extra Segment (E)
MOV fs,ax ; Extra Extra Segment (F Comes after E)
MOV gs,ax ; Extra Extra Extra Segment (G Comes after F)
;-------------------------------
;--Setting Up The Stack
;--Stack Grows Downwards
;-------------------------------
STACK:
MOV ax,0
MOV ss,ax ; Cant Directly MOVe to Stack Segment
MOV sp,0xFFFE ; Start Stackpointer from the top, growing downward
STI ; Restore Interupts
MOV ax, 0x3
INT 0x10
SECONDSTAGE:
MOV si, FirstMessageExecution
CALL printfbln
; Load stage 2 to memory.
MOV ah, 0x02
; Number of sectors to read.
MOV al, 20
; This may not be necessary as many BIOS set it up as an initial state.
MOV dl, 0x00
; Cylinder number.
MOV ch, 0
; Head number.
MOV dh, 0
; Starting sector number 2 because 1 was already loaded.
MOV cl, 2
; Where to load to.
MOV bx, stage2
INT 0x13
JMP stage2
; Magic bytes.
times ((0x200 - 2) - ($ - $$)) db 0x00
dw 0xAA55
;--------------------------------------
; load2.asm
; Second Stage Bootloader
; Which then loads the kernel
; in 32 bit protected mode!
;
;--------------------------------------
%include "boot2.asm"
boot2.asm：
;----------------------------------------------;
;
; The BoneOS Stage 2 Bootloader
; -----------------------------
;
;
; Contributors : @amanuel2
;
;
;----------------------------------------------;
stage2:
MOV si, SECONDSTAGEXECUTION
CALL printfbln
; enable A20 gate
enable_A20: ; Enabling A20 Line For Full Memory
cli ; Stop Interupts before doing so
call a20wait ; a20wait call
mov al,0xAD ; Send 0xAD Command to al register
out 0x64,al ; Send command 0xad (disable keyboard).
call a20wait ; When controller ready for command
mov al,0xD0 ; Send 0xD0 Command to al register
out 0x64,al ; Send command 0xd0 (read from input)
call a20wait2 ; When controller ready for command
in al,0x60 ; Read input from keyboard
push eax ; Save Input by pushing to stack
call a20wait ; When controller ready for command
mov al,0xD1 ; mov 0xD1 Command to al register
out 0x64,al ; Set command 0xd1 (write to output)
call a20wait ; When controller ready for command
pop eax ; Pop Input from Keyboard
or al,2 ; Mov 0xD3 to al register
out 0x60,al ; Set Command 0xD3
call a20wait ; When controller ready for command
mov al,0xAE ; Mov Command 0xAE To al register
out 0x64,al ; Write command 0xae (enable keyboard)
call a20wait ; When controller ready for command
sti ; Enable Interrupts after enabling A20 Line
;load a GDT
; enter pmode
loadgdt:
cli ; disable int
LGDT [gdt_descriptor] ; Load global descriptor table for protected mode
mov EAX, CR0 ; Move CR0 to GP register
or EAX, 0x1 ; Set first bit to switch to protected mode
mov CR0, EAX ; Update CR0 from GP register to complete switch
;JMP gdt_codeSeg:start32 ; Jump to start of 32-bit code
jmp 0x08:stage3 ; go to 32-bit code
%include "boot3.asm"
times ((0x400) - ($ - $$)) db 0x00
%include "kernel.asm"
boot3.asm：
;----------------------------------------------;
;
; The BoneOS Bootloader Third Stage Bootloader
; ------------------------------
;
;
; Contributors : @amanuel2
;
;
;----------------------------------------------;
%include "stdio32boot.inc"
[BITS 32]
stage3:
; set segment registers
mov ax, 0x10
mov ds, ax
mov ss, ax
mov esp, 0x090000 ; set up stack pointer
push 'A'
call puts32char
add esp, 4
jmp 0x08:k_main
cli
loopend: ;Infinite loop when finished
hlt
jmp loopend
cli
hlt
kernel.asm：
;ORG 0x9000
BITS 32
k_main:
mov byte [0xB8000], 88
mov byte [0xB8000+1], 0x1B
mov byte [0xB8000+4], 89
mov byte [0xB8000+5], 0x1B
cli
hlt
正如你所看到的，我已经从bootloader加载了内核，现在它在Assembly中都很好，但是我的问题出现了：我如何让kernel.asm从Assembly中调用像kernelc_main这样的C函数？ / p>
答案 0 :(得分：0)
您可以尝试这样做：
在C语言中创建一个类
void kmain()
{
//Do here.....
}
上面的代码在C语言中创建了一个名为“ kmain”的类
现在，在您的汇编代码中，
ORG 0x9000
BITS 32
extern kmain
k_main:
mov byte [0xB8000], 88
mov byte [0xB8000+1], 0x1B
mov byte [0xB8000+4], 89
mov byte [0xB8000+5], 0x1B
call kmain
cli
hlt
语法“ extern”用于在汇编中包括外部函数或类。 然后，您可以使用普通的“调用”来调用内核。
希望这个答案会有用， 谢谢