void init_startup_thread(uint32_t arg)
{
/* Threads have arguments for functions they run, we don't
need any. Silence the compiler warning by using the argument. */
arg = arg;
kprintf("Mounting filesystems\n");
vfs_mount_all();
kprintf("Initializing networking\n");
network_init();
if(bootargs_get("initprog") == NULL) {
kprintf("No initial program (initprog), dropping to fallback\n");
init_startup_fallback();
}
kprintf("Starting initial program '%s'\n", bootargs_get("initprog"));
/* `process_start` no longer takes an executable as its argument, so we need
to start initprog with `process_spawn`. */
process_id_t pid = process_spawn(bootargs_get("initprog"));
if (pid < 0) {
KERNEL_PANIC("Couldn't fit initial program in process table.\n");
}
process_join(pid);
/* The current process_start() should never return. */
KERNEL_PANIC("Run out of initprog.\n");
}
void init_startup_thread(uint32_t arg)
{
/* Threads have arguments for functions they run, we don't
need any. Silence the compiler warning by using the argument. */
arg = arg;
process_id_t pid;
kprintf("Mounting filesystems\n");
vfs_mount_all();
kprintf("Initializing networking\n");
network_init();
if(bootargs_get("initprog") == NULL) {
kprintf("No initial program (initprog), dropping to fallback\n");
init_startup_fallback();
}
kprintf("Starting initial program '%s'\n", bootargs_get("initprog"));
pid = process_spawn(bootargs_get("initprog"));
if (pid < 0)
KERNEL_PANIC("Couldn't fit initial program in process table.\n");
process_join(pid);
halt_kernel();
}
static void process_cmd(const string &ip, const string &data, string &answer) {
switch(data[0]) {
case 'J':
{
cout << "Command join received" << endl;
process_join(ip, answer);
break;
}
case 'G':
{
cout << "Command get_subset received" << endl;
process_get_subset(ip, answer);
break;
}
case 'P':
{
cout << "Command publish received" << endl;
process_publish(ip, data, answer);
break;
}
default:
{
cout << "Unknown command " << data[0] << " from " << ip << endl;
exit(-1);
}
}
}
/**
* Handle system calls. Interrupts are enabled when this function is
* called.
*
* @param user_context The userland context (CPU registers as they
* where when system call instruction was called in userland)
*/
void syscall_handle(context_t *user_context)
{
/* When a syscall is executed in userland, register a0 contains
* the number of the syscall. Registers a1, a2 and a3 contain the
* arguments of the syscall. The userland code expects that after
* returning from the syscall instruction the return value of the
* syscall is found in register v0. Before entering this function
* the userland context has been saved to user_context and after
* returning from this function the userland context will be
* restored from user_context.
*/
int retval;
switch(user_context->cpu_regs[MIPS_REGISTER_A0]) {
case SYSCALL_HALT:
halt_kernel();
break;
case SYSCALL_EXEC:
retval = (int) process_spawn((char*) user_context->cpu_regs[MIPS_REGISTER_A1]);
user_context->cpu_regs[MIPS_REGISTER_V0] = retval;
break;
case SYSCALL_EXIT:
/* Resources are cleaned up in process_finish(...) */
process_finish(user_context->cpu_regs[MIPS_REGISTER_A1]);
break;
case SYSCALL_JOIN:
retval = process_join(user_context->cpu_regs[MIPS_REGISTER_A1]);
user_context->cpu_regs[MIPS_REGISTER_V0] = retval;
break;
case SYSCALL_READ:
{
int fhandle = user_context->cpu_regs[MIPS_REGISTER_A1];
int buffer = user_context->cpu_regs[MIPS_REGISTER_A2];
int length = user_context->cpu_regs[MIPS_REGISTER_A3];
int retval = syscall_read(fhandle, (void *)buffer, length);
user_context->cpu_regs[MIPS_REGISTER_V0] = retval;
}
break;
case SYSCALL_WRITE:
{
int fhandle = user_context->cpu_regs[MIPS_REGISTER_A1];
int buffer = user_context->cpu_regs[MIPS_REGISTER_A2];
int length = user_context->cpu_regs[MIPS_REGISTER_A3];
int retval = syscall_write(fhandle, (void *)buffer, length);
user_context->cpu_regs[MIPS_REGISTER_V0] = retval;
}
break;
default:
KERNEL_PANIC("Unhandled system call\n");
}
/* Move to next instruction after system call */
user_context->pc += 4;
}
/**
* Handle system calls. Interrupts are enabled when this function is
* called.
*/
uintptr_t syscall_entry(uintptr_t syscall,
uintptr_t arg0, uintptr_t arg1, uintptr_t arg2)
{
arg0 = arg0;
arg1 = arg1;
arg2 = arg2;
/* When a syscall is executed in userland, register a0 contains
* the number of the syscall. Registers a1, a2 and a3 contain the
* arguments of the syscall. The userland code expects that after
* returning from the syscall instruction the return value of the
* syscall is found in register v0. Before entering this function
* the userland context has been saved to user_context and after
* returning from this function the userland context will be
* restored from user_context.
*/
switch(syscall) {
case SYSCALL_HALT:
halt_kernel();
break;
case SYSCALL_READ:
return syscall_read((void*)arg1);
break;
case SYSCALL_WRITE:
return syscall_write((const void*)arg1, (int)arg2);
break;
case SYSCALL_SPAWN:
return syscall_spawn((char const*)arg0, (void*) arg1);
break;
case SYSCALL_EXIT:
syscall_exit((int)arg0);
break;
case SYSCALL_JOIN:
return process_join((int)arg0);
break;
default:
KERNEL_PANIC("Unhandled system call\n");
}
return 0;
}
int syscall_join(int pid){
int retval = process_join(pid);
return retval;
}
int syscall_join(int pid) {
return process_join((process_id_t) pid);
}
int syscall_join(process_id_t pid)
{
return process_join(pid);
}
int join (int pid) {
return process_join((process_id_t) pid);
}