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// bio.c
void binit(void);
struct buf* bread(uint, uint);
void brelse(struct buf*);
void bwrite(struct buf*);
// file.c
struct file* filealloc(void);
void fileclose(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);
struct inode* dirlookup(struct inode*, char*, uint*);
struct inode* ialloc(uint, short);
struct inode* idup(struct inode*);
void ilock(struct inode*);
void iput(struct inode*);
void iunlock(struct inode*);
void iunlockput(struct inode*);
int readi(struct inode*, char*, uint, uint);
void stati(struct inode*, struct stat*);
int writei(struct inode*, char*, uint, uint);
void ideinit(void);
void ideintr(void);
void ioapicenable(int irq, int cpu);
extern uchar ioapicid;
void ioapicinit(void);
char* kalloc(void);
void kfree(char*);
void kinit(char*,uint);
void lapiceoi(void);
void lapicinit(int);
void lapicstartap(uchar, uint);
int mpbcpu(void);
void mpinit(void);
void mpstartthem(void);
void picenable(int);
void picinit(void);
int pipealloc(struct file**, struct file**);
void pipeclose(struct pipe*, int);
int piperead(struct pipe*, char*, int);
int pipewrite(struct pipe*, char*, int);
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*);
// 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);
// syscall.c
int argint(int, int*);
int argptr(int, char**, int);
int argstr(int, char**);
int fetchint(struct proc*, uint, int*);
int fetchstr(struct proc*, uint, char**);
void syscall(void);
void uartinit(void);
void uartintr(void);
void uartputc(int);
// vm.c
void pminit(void);
pde_t* setupkvm(void);
char* uva2ka(pde_t*, char*);
int allocuvm(pde_t*, char*, uint);
int deallocuvm(pde_t *pgdir, char *addr, uint sz);
void freevm(pde_t*);
void inituvm(pde_t*, char*, char*, uint);
int loaduvm(pde_t*, char*, struct inode *ip, uint, uint);
pde_t* copyuvm(pde_t*,uint);
void switchuvm(struct proc*);
void switchkvm();
// number of elements in fixed-size array
#define NELEM(x) (sizeof(x)/sizeof((x)[0]))