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kernel/serial.o: In function `outb':
/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:47: multiple definition of `init_serial'
kmain.o:/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:58: first defined here
kernel/serial.o: In function `inb':
/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:54: multiple definition of `serial_received'
kmain.o:/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:65: first defined here
kernel/serial.o: In function `inb':
/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:54: multiple definition of `read_serial'
kmain.o:/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:65: first defined here
kernel/serial.o: In function `inb':
/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:54: multiple definition of `is_transmit_empty'
kmain.o:/mnt/c/Users/user/Desktop/osproject/kernel/kernel.h:65: first defined here
kernel/serial.o: In function `write_serial':
/mnt/c/Users/user/Desktop/osproject/kernel/serial.c:37: multiple definition of `write_serial'
kmain.o:/mnt/c/Users/user/Desktop/osproject/kernel/serial.h:40: first defined here
collect2: error: ld returned 1 exit status

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In file included from kmain.c:5:0:
kernel/isrs.h: In function ‘fault_handler’:
kernel/isrs.h:142:22: error: ‘LIGHTGRAY’ undeclared (first use in this function)
         settextcolor(LIGHTGRAY, RED);
                      ^
kernel/isrs.h:142:22: note: each undeclared identifier is reported only once for each function it appears in
kernel/isrs.h:142:33: error: ‘RED’ undeclared (first use in this function)
         settextcolor(LIGHTGRAY, RED);
                                 ^
kmain.c: In function ‘kernelmain’:
kmain.c:24:38: error: expected ‘)’ before ‘nl’
     println("asd ����� �"nl);
                                      ^
kmain.c:33:13: error: ‘nl’ undeclared (first use in this function)
     println(nl);
             ^

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#ifndef TERMINAL_H
#define TERMINAL_H

#define BLACK 0
#define BLUE 1
#define GREEN 2
#define CYAN 3
#define RED 4
#define MAGENTA 5
#define BROWN 6
#define LIGHTGRAY 7
#define DARKGRAY 8
#define LIGHTBLUE 9
#define LIGHTGREEN 10
#define LIGHTCYAN 11
#define LIGHTRED 12
#define LIGHTMAGENTA 13
#define YELLOW 14
#define WHITE 15
#define nl "\r\n"

/* you will want to remove these from 'kernel.h' anyway */
void scroll(void);
void move_csr(void);
void gotoxy(int x, int y);
void clear_screen(void);
void putch(unsigned char c);
void rawputch(unsigned char c);
void println(char *text);
void settextcolor(unsigned char forecolor, unsigned char backcolor);
void init_video(void);
unsigned char getch(void);
char *readln(char *str, int maxnumchars);
char *itoa(int val, int base);

#endif

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#ifndef TIMER_H
#define TIMER_H

void timer_phase(int hz);
void timer_handler(struct regs *r);
void timer_install();
void timer_wait(int ticks);
void sleep(int seconds);

#endif

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#ifndef SERIAL_H
#define SERIAL_H

void init_serial(void);
int serial_received(void);
unsigned char read_serial(void);
int is_transmit_empty(void);
void write_serial(char a);

#endif