/*===========================================================================*
* main *
*===========================================================================*/
int main(void)
{
message msg;
int result, who_e, rcv_sts;
int caller_slot;
/* Initialize system so that all processes are runnable */
init_vm();
/* Register init callbacks. */
sef_setcb_init_restart(sef_cb_init_fail);
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
SANITYCHECK(SCL_TOP);
/* This is VM's main loop. */
while (TRUE) {
int r, c;
u32_t type, param;
SANITYCHECK(SCL_TOP);
if(missing_spares > 0) {
alloc_cycle(); /* mem alloc code wants to be called */
}
if ((r=sef_receive_status(ANY, &msg, &rcv_sts)) != OK)
panic("sef_receive_status() error: %d", r);
if (is_ipc_notify(rcv_sts)) {
/* Unexpected notify(). */
printf("VM: ignoring notify() from %d\n", msg.m_source);
continue;
}
who_e = msg.m_source;
if(vm_isokendpt(who_e, &caller_slot) != OK)
panic("invalid caller %d", who_e);
type = param = msg.m_type;
type &= 0x0000FFFF;
param >>= 16;
c = CALLNUMBER(type);
result = ENOSYS; /* Out of range or restricted calls return this. */
if(msg.m_type == RS_INIT && msg.m_source == RS_PROC_NR) {
result = do_rs_init(&msg);
} else if (msg.m_type == VM_PAGEFAULT) {
if (!IPC_STATUS_FLAGS_TEST(rcv_sts, IPC_FLG_MSG_FROM_KERNEL)) {
printf("VM: process %d faked VM_PAGEFAULT "
"message!\n", msg.m_source);
}
do_pagefaults(&msg);
/*
* do not reply to this call, the caller is unblocked by
* a sys_vmctl() call in do_pagefaults if success. VM panics
* otherwise
*/
continue;
} else if(c < 0 || !vm_calls[c].vmc_func) {
/* out of range or missing callnr */
} else {
if (acl_check(&vmproc[caller_slot], c) != OK) {
printf("VM: unauthorized %s by %d\n",
vm_calls[c].vmc_name, who_e);
} else {
SANITYCHECK(SCL_FUNCTIONS);
result = vm_calls[c].vmc_func(&msg);
SANITYCHECK(SCL_FUNCTIONS);
}
}
/* Send reply message, unless the return code is SUSPEND,
* which is a pseudo-result suppressing the reply message.
*/
if(result != SUSPEND) {
msg.m_type = result;
if((r=send(who_e, &msg)) != OK) {
printf("VM: couldn't send %d to %d (err %d)\n",
msg.m_type, who_e, r);
panic("send() error");
}
}
}
return(OK);
}
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(void)
{
/* Main routine of the scheduler. */
message m_in; /* the incoming message itself is kept here. */
int call_nr; /* system call number */
int who_e; /* caller's endpoint */
int result; /* result to system call */
int rv;
/* SEF local startup. */
sef_local_startup();
/* Initialize scheduling timers, used for running balance_queues */
init_scheduling();
/* my Hello code*/
printf("\n%s\n", " =========================================================");
printf("%s\n", " Hello, Minix is now using a lottery scheduler.");
printf("%s\n\n", " =========================================================");
/* This is SCHED's main loop - get work and do it, forever and forever. */
while (TRUE) {
int ipc_status;
/* Wait for the next message and extract useful information from it. */
if (sef_receive_status(ANY, &m_in, &ipc_status) != OK)
panic("SCHED sef_receive error");
who_e = m_in.m_source; /* who sent the message */
call_nr = m_in.m_type; /* system call number */
/* Check for system notifications first. Special cases. */
if (is_ipc_notify(ipc_status)) {
switch(who_e) {
case CLOCK:
expire_timers(m_in.NOTIFY_TIMESTAMP);
continue; /* don't reply */
default :
result = ENOSYS;
}
goto sendreply;
}
switch(call_nr) {
case SCHEDULING_INHERIT:
case SCHEDULING_START:
result = do_start_scheduling(&m_in);
break;
case SCHEDULING_STOP:
result = do_stop_scheduling(&m_in);
break;
case SCHEDULING_SET_NICE:
result = do_nice(&m_in);
break;
case SCHEDULING_NO_QUANTUM:
/* This message was sent from the kernel, don't reply */
if (IPC_STATUS_FLAGS_TEST(ipc_status,
IPC_FLG_MSG_FROM_KERNEL)) {
if ((rv = do_noquantum(&m_in)) != (OK)) {
printf("SCHED: Warning, do_noquantum "
"failed with %d\n", rv);
}
continue; /* Don't reply */
}
else {
printf("SCHED: process %d faked "
"SCHEDULING_NO_QUANTUM message!\n",
who_e);
result = EPERM;
}
break;
default:
result = no_sys(who_e, call_nr);
}
sendreply:
/* Send reply. */
if (result != SUSPEND) {
m_in.m_type = result; /* build reply message */
reply(who_e, &m_in); /* send it away */
}
}
return(OK);
}
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(void)
{
message msg;
int result, who_e, rcv_sts;
int caller_slot;
struct vmproc *vmp_caller;
/* SEF local startup. */
sef_local_startup();
SANITYCHECK(SCL_TOP);
/* This is VM's main loop. */
while (TRUE) {
int r, c;
SANITYCHECK(SCL_TOP);
if(missing_spares > 0) {
pt_cycle(); /* pagetable code wants to be called */
}
if ((r=sef_receive_status(ANY, &msg, &rcv_sts)) != OK)
panic("sef_receive_status() error: %d", r);
if (is_ipc_notify(rcv_sts)) {
/* Unexpected notify(). */
printf("VM: ignoring notify() from %d\n", msg.m_source);
continue;
}
who_e = msg.m_source;
if(vm_isokendpt(who_e, &caller_slot) != OK)
panic("invalid caller", who_e);
vmp_caller = &vmproc[caller_slot];
c = CALLNUMBER(msg.m_type);
result = ENOSYS; /* Out of range or restricted calls return this. */
if (msg.m_type == VM_PAGEFAULT) {
if (!IPC_STATUS_FLAGS_TEST(rcv_sts, IPC_FLG_MSG_FROM_KERNEL)) {
printf("VM: process %d faked VM_PAGEFAULT "
"message!\n", msg.m_source);
}
do_pagefaults(&msg);
/*
* do not reply to this call, the caller is unblocked by
* a sys_vmctl() call in do_pagefaults if success. VM panics
* otherwise
*/
continue;
} else if(c < 0 || !vm_calls[c].vmc_func) {
/* out of range or missing callnr */
} else {
if (vm_acl_ok(who_e, c) != OK) {
printf("VM: unauthorized %s by %d\n",
vm_calls[c].vmc_name, who_e);
} else {
SANITYCHECK(SCL_FUNCTIONS);
result = vm_calls[c].vmc_func(&msg);
SANITYCHECK(SCL_FUNCTIONS);
}
}
/* Send reply message, unless the return code is SUSPEND,
* which is a pseudo-result suppressing the reply message.
*/
if(result != SUSPEND) {
msg.m_type = result;
if((r=send(who_e, &msg)) != OK) {
printf("VM: couldn't send %d to %d (err %d)\n",
msg.m_type, who_e, r);
panic("send() error");
}
}
}
return(OK);
}
