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char *kalloc(int);
void kfree(char*, int);
void cprintf(char*, ...);
void panic(char*);
void pinit(void);
void setupsegs(struct proc*);
struct proc* copyproc(struct proc*);
void scheduler(void);
int proc_kill(int);
int proc_wait(void);
// swtch.S
struct jmpbuf;
int setjmp(struct jmpbuf*);
void longjmp(struct jmpbuf*);
void * memset(void*, int, uint);
int memcmp(const void*, const void*, uint);
void *memmove(void*, const void*, uint);
int strncmp(const char*, const char*, uint);
void mp_init(void);
void lapic_timerinit(void);
void lapic_timerintr(void);
void lapic_enableintr(void);
// ioapic
extern uchar ioapic_id;
void ioapic_init(void);
// spinlock.c
void acquire(struct spinlock*);
void release(struct spinlock*);
int holding(struct spinlock*);
void load_icode(struct proc*, uchar*, uint);
int pipe_alloc(struct fd**, struct fd**);
void pipe_close(struct pipe*, int);
int pipe_write(struct pipe*, char*, int);
int pipe_read(struct pipe*, char*, int);
void fd_init(void);
struct fd* fd_alloc(void);
void fd_close(struct fd*);
int fd_read(struct fd*, char*, int n);
int fd_write(struct fd*, char*, int n);
int fd_stat(struct fd*, struct stat*);
void fd_incref(struct fd*);
void* ide_start_rw(int, uint, void*, uint, int);
int ide_finish(void*);
void binit(void);
struct buf* getblk(uint dev, uint sector);
struct buf* bread(uint, uint);
void bwrite(struct buf*, uint);
void brelse(struct buf*);
void iinit(void);
struct inode* iget(uint, uint);
void ilock(struct inode*);
void iunlock(struct inode*);
void itrunc(struct inode*);
void idecref(struct inode*);
void iincref(struct inode*);
void iput(struct inode*);
struct inode* namei(char*, int, uint*, char**, struct inode**);
void stati(struct inode*, struct stat*);
int readi(struct inode*, char*, uint, uint);
int writei(struct inode*, char*, uint, uint);
struct inode* mknod(char*, short, short, short);
struct inode* mknod1(struct inode*, char*, short, short, short);
int unlink(char*);
void iupdate(struct inode*);
int link(char*, char*);