kern
annotate src/syscall.c @ 54:4eaecb14fe31
bringing the task switching thing into shape with proper per-process kernel stacks and shit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 14 Aug 2011 16:57:23 +0300 |
| parents | fa65b4f45366 |
| children | 0be4615594df |
| 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@51 | 7 |
| nuclear@51 | 8 static int (*sys_func[NUM_SYSCALLS])(); |
| nuclear@51 | 9 |
| nuclear@52 | 10 static void syscall(int inum); |
| nuclear@51 | 11 |
| nuclear@51 | 12 static int sys_exit(int status); |
| nuclear@51 | 13 static int sys_hello(void); |
| nuclear@51 | 14 static int sys_sleep(int sec); |
| nuclear@51 | 15 |
| nuclear@51 | 16 void init_syscall(void) |
| nuclear@51 | 17 { |
| nuclear@51 | 18 sys_func[SYS_EXIT] = sys_exit; |
| nuclear@51 | 19 sys_func[SYS_HELLO] = sys_hello; |
| nuclear@51 | 20 sys_func[SYS_SLEEP] = sys_sleep; |
| nuclear@51 | 21 |
| nuclear@51 | 22 interrupt(SYSCALL_INT, syscall); |
| nuclear@51 | 23 } |
| nuclear@51 | 24 |
| nuclear@52 | 25 static void syscall(int inum) |
| nuclear@51 | 26 { |
| nuclear@52 | 27 struct intr_frame *frm; |
| nuclear@52 | 28 int idx; |
| nuclear@52 | 29 |
| nuclear@52 | 30 frm = get_intr_frame(); |
| nuclear@52 | 31 idx = frm->regs.eax; |
| nuclear@51 | 32 |
| nuclear@51 | 33 if(idx < 0 || idx >= NUM_SYSCALLS) { |
| nuclear@51 | 34 printf("invalid syscall: %d\n", idx); |
| nuclear@51 | 35 return; |
| nuclear@51 | 36 } |
| nuclear@51 | 37 |
| nuclear@54 | 38 /* the return value goes into the interrupt frame copy of the user's eax |
| nuclear@54 | 39 * so that it'll be restored into eax before returning to userland. |
| nuclear@54 | 40 */ |
| nuclear@51 | 41 frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi); |
| nuclear@51 | 42 } |
| nuclear@51 | 43 |
| nuclear@51 | 44 static int sys_exit(int status) |
| nuclear@51 | 45 { |
| nuclear@54 | 46 printf("SYSCALL: exit\n"); |
| nuclear@51 | 47 return -1; /* not implemented yet */ |
| nuclear@51 | 48 } |
| nuclear@51 | 49 |
| nuclear@51 | 50 static int sys_hello(void) |
| nuclear@51 | 51 { |
| nuclear@54 | 52 printf("process %d says hello!\n", get_current_pid()); |
| nuclear@51 | 53 return 0; |
| nuclear@51 | 54 } |
| nuclear@51 | 55 |
| nuclear@51 | 56 static int sys_sleep(int sec) |
| nuclear@51 | 57 { |
| nuclear@54 | 58 printf("SYSCALL: sleep\n"); |
| nuclear@54 | 59 return -1; |
| nuclear@51 | 60 } |