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struct buf;
struct context;
struct file;
struct inode;
struct pipe;
struct proc;
struct spinlock;
struct stat;
struct superblock;
// bio.c
void binit(void);
struct buf* bread(uint, uint);
void brelse(struct buf*);
void bwrite(struct buf*);
// console.c
void consoleinit(void);
void cprintf(char*, ...);
void consoleintr(int(*)(void));
void panic(char*) __attribute__((noreturn));
// exec.c
int exec(char*, char**);
// file.c
struct file* filealloc(void);
void fileclose(struct file*);
struct file* filedup(struct file*);
void fileinit(void);
int fileread(struct file*, char*, int n);
int filestat(struct file*, struct stat*);
int filewrite(struct file*, char*, int n);
// fs.c
void readsb(int dev, struct superblock *sb);
int dirlink(struct inode*, char*, uint);
struct inode* dirlookup(struct inode*, char*, uint*);
struct inode* ialloc(uint, short);
struct inode* idup(struct inode*);
void iinit(void);
void ilock(struct inode*);
void iput(struct inode*);
void iunlock(struct inode*);
void iunlockput(struct inode*);
void iupdate(struct inode*);
int namecmp(const char*, const char*);
struct inode* namei(char*);
struct inode* nameiparent(char*, char*);
int readi(struct inode*, char*, uint, uint);
void stati(struct inode*, struct stat*);
int writei(struct inode*, char*, uint, uint);
// ide.c
void ideinit(void);
void ideintr(void);
void iderw(struct buf*);
// ioapic.c
void ioapicenable(int irq, int cpu);
extern uchar ioapicid;
void ioapicinit(void);
// kalloc.c
char* kalloc(void);
void kfree(char*);
void kinit1(void*, void*);
void kinit2(void*, void*);
// kbd.c
void kbdintr(void);
// lapic.c
int cpunum(void);
extern volatile uint* lapic;
void lapiceoi(void);
void lapicinit(int);
void lapicstartap(uchar, uint);
void microdelay(int);
// log.c
void initlog(void);
void log_write(struct buf*);
void begin_trans();
void commit_trans();
// mp.c
extern int ismp;
int mpbcpu(void);
void mpinit(void);
void mpstartthem(void);
// picirq.c
void picenable(int);
void picinit(void);
// pipe.c
int pipealloc(struct file**, struct file**);
void pipeclose(struct pipe*, int);
int piperead(struct pipe*, char*, int);
int pipewrite(struct pipe*, char*, int);
// proc.c
struct proc* copyproc(struct proc*);
void exit(void);
int fork(void);
int growproc(int);
int kill(int);
void pinit(void);
void procdump(void);
void scheduler(void) __attribute__((noreturn));
void sched(void);
void sleep(void*, struct spinlock*);
void userinit(void);
int wait(void);
void wakeup(void*);
void yield(void);
// swtch.S
void swtch(struct context**, struct context*);
// spinlock.c
void acquire(struct spinlock*);
void getcallerpcs(void*, uint*);
int holding(struct spinlock*);
void initlock(struct spinlock*, char*);
void release(struct spinlock*);
void pushcli(void);
void popcli(void);
// string.c
int memcmp(const void*, const void*, uint);
void* memmove(void*, const void*, uint);
void* memset(void*, int, uint);
char* safestrcpy(char*, const char*, int);
int strlen(const char*);
int strncmp(const char*, const char*, uint);
char* strncpy(char*, const char*, int);
// syscall.c
int argint(int, int*);
int argptr(int, char**, int);
int argstr(int, char**);
int fetchint(uint, int*);
int fetchstr(uint, char**);
void syscall(void);
// timer.c
void timerinit(void);
// trap.c
void idtinit(void);
extern uint ticks;
void tvinit(void);
extern struct spinlock tickslock;
// uart.c
void uartinit(void);
void uartintr(void);
void uartputc(int);
// vm.c
void seginit(void);
void kvmalloc(void);
void vmenable(void);
pde_t* setupkvm();
char* uva2ka(pde_t*, char*);
int allocuvm(pde_t*, uint, uint);
int deallocuvm(pde_t*, uint, uint);
void freevm(pde_t*);
void inituvm(pde_t*, char*, uint);
int loaduvm(pde_t*, char*, struct inode*, uint, uint);
pde_t* copyuvm(pde_t*, uint);
void switchuvm(struct proc*);
void switchkvm(void);
int copyout(pde_t*, uint, void*, uint);
void clearpteu(pde_t *pgdir, char *uva);
// number of elements in fixed-size array
#define NELEM(x) (sizeof(x)/sizeof((x)[0]))