OS

https://pdos.csail.mit.edu/6.S081/2020/labs/net.html /* kernel/e1000.c */ // struct spinlock e1000_lock; struct spinlock e1000_tx_lock; struct spinlock e1000_rx_lock; /* kernel/e1000.c */ void e1000_init(uint32 *xregs) { int i; // initlock(&e1000_lock, "e1000"); initlock(&e1000_tx_lock, "e1000_tx"); initlock(&e1000_rx_lock, "e1000_rx"); ... } /* kernel/e1000.c */ int e1000_transmit(struct mbuf *..

https://pdos.csail.mit.edu/6.S081/2020/labs/mmap.html Makefile에 mmaptest를 추가합니다. # Makefile UPROGS=\ ... $U/_mmaptest\ mmap과 munmap system call에 필요한 선언과 정의들을 추가합니다. /* kernel/syscall.h */ // System call numbers ... #define SYS_mmap 22 #define SYS_munmap 23 /* kernel/syscall.c */ ... extern uint64 sys_mmap(void); extern uint64 sys_munmap(void); static uint64 (*syscalls[])(void) = { ... [SYS_mmap]..

https://pdos.csail.mit.edu/6.S081/2020/labs/fs.html Large files struct dinode의 addrs에서 원래 direct block 12개, indirect block 1개였던 것을 direct block 11개, indirect block 2개로 바꿔야 하므로, NDIRECT, struct dinode, struct inode의 정의를 수정합니다. /* kernel/fs.h */ // #define NDIRECT 12 #define NDIRECT 11 ... // On-disk inode structure struct dinode { ... // uint addrs[NDIRECT + 1]; // Data block addresses uint addrs..

https://pdos.csail.mit.edu/6.S081/2020/labs/lock.html Memory allocator kmem을 CPU의 개수(NCPU)만큼의 element들을 갖는 배열로 수정합니다. /* kernel/kalloc.c */ struct { struct spinlock lock; struct run *freelist; } kmem[NCPU]; CPU마다 lock name을 다르게 만들어야 하므로, kmem 구조체에 lockname을 추가합니다. /* kernel/kalloc.c */ #define LOCKNAME_MAX 0x10 struct { struct spinlock lock; char lockname[LOCKNAME_MAX]; struct run *freelist; } k..

https://pdos.csail.mit.edu/6.S081/2020/labs/thread.html Uthread: switching between threads thread 구조체에 레지스터를 저장할 공간과 thread가 참조할 함수 포인터를 추가합니다. /* user/uthread.c */ struct reg { uint64 ra; uint64 sp; uint64 s0; uint64 s1; uint64 s2; uint64 s3; uint64 s4; uint64 s5; uint64 s6; uint64 s7; uint64 s8; uint64 s9; uint64 s10; uint64 s11; }; struct thread { struct reg reg; /* the thread's registers */ ..