kern
annotate src/syscall.c @ 97:8717eb590727
ok stopping with the filesystem to manage to write the article in time
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 17 Dec 2011 14:09:17 +0200 |
| parents | 3941e82b07f2 |
| children |
| rev | line source |
|---|---|
| nuclear@51 | 1 #include <stdio.h> |
| nuclear@51 | 2 #include "syscall.h" |
| nuclear@51 | 3 #include "intr.h" |
| nuclear@51 | 4 #include "proc.h" |
| nuclear@51 | 5 #include "sched.h" |
| nuclear@51 | 6 #include "timer.h" |
| nuclear@90 | 7 #include "fs.h" |
| nuclear@51 | 8 |
| nuclear@51 | 9 static int (*sys_func[NUM_SYSCALLS])(); |
| nuclear@51 | 10 |
| nuclear@52 | 11 static void syscall(int inum); |
| nuclear@51 | 12 |
| nuclear@51 | 13 static int sys_hello(void); |
| nuclear@51 | 14 |
| nuclear@51 | 15 void init_syscall(void) |
| nuclear@51 | 16 { |
| nuclear@51 | 17 sys_func[SYS_HELLO] = sys_hello; |
| nuclear@72 | 18 sys_func[SYS_SLEEP] = sys_sleep; /* timer.c */ |
| nuclear@72 | 19 sys_func[SYS_FORK] = sys_fork; /* proc.c */ |
| nuclear@72 | 20 sys_func[SYS_EXIT] = sys_exit; /* proc.c */ |
| nuclear@72 | 21 sys_func[SYS_WAITPID] = sys_waitpid; /* proc.c */ |
| nuclear@72 | 22 sys_func[SYS_GETPID] = sys_getpid; /* proc.c */ |
| nuclear@72 | 23 sys_func[SYS_GETPPID] = sys_getppid; /* proc.c */ |
| nuclear@51 | 24 |
| nuclear@90 | 25 sys_func[SYS_MOUNT] = sys_mount; /* fs.c */ |
| nuclear@90 | 26 sys_func[SYS_UMOUNT] = sys_umount; /* fs.c */ |
| nuclear@90 | 27 sys_func[SYS_OPEN] = sys_open; /* fs.c */ |
| nuclear@90 | 28 sys_func[SYS_CLOSE] = sys_close; /* fs.c */ |
| nuclear@90 | 29 sys_func[SYS_READ] = sys_read; /* fs.c */ |
| nuclear@90 | 30 sys_func[SYS_WRITE] = sys_write; /* fs.c */ |
| nuclear@90 | 31 sys_func[SYS_LSEEK] = sys_lseek; /* fs.c */ |
| nuclear@90 | 32 |
| nuclear@51 | 33 interrupt(SYSCALL_INT, syscall); |
| nuclear@51 | 34 } |
| nuclear@51 | 35 |
| nuclear@52 | 36 static void syscall(int inum) |
| nuclear@51 | 37 { |
| nuclear@52 | 38 struct intr_frame *frm; |
| nuclear@52 | 39 int idx; |
| nuclear@52 | 40 |
| nuclear@52 | 41 frm = get_intr_frame(); |
| nuclear@52 | 42 idx = frm->regs.eax; |
| nuclear@51 | 43 |
| nuclear@51 | 44 if(idx < 0 || idx >= NUM_SYSCALLS) { |
| nuclear@51 | 45 printf("invalid syscall: %d\n", idx); |
| nuclear@51 | 46 return; |
| nuclear@51 | 47 } |
| nuclear@51 | 48 |
| nuclear@54 | 49 /* the return value goes into the interrupt frame copy of the user's eax |
| nuclear@54 | 50 * so that it'll be restored into eax before returning to userland. |
| nuclear@54 | 51 */ |
| nuclear@51 | 52 frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi); |
| nuclear@72 | 53 |
| nuclear@72 | 54 /* we don't necessarily want to return to the same process |
| nuclear@72 | 55 * might have blocked or exited or whatever, so call schedule |
| nuclear@72 | 56 * to decide what's going to run next. |
| nuclear@72 | 57 */ |
| nuclear@72 | 58 schedule(); |
| nuclear@51 | 59 } |
| nuclear@51 | 60 |
| nuclear@51 | 61 static int sys_hello(void) |
| nuclear@51 | 62 { |
| nuclear@54 | 63 printf("process %d says hello!\n", get_current_pid()); |
| nuclear@51 | 64 return 0; |
| nuclear@51 | 65 } |