void
M68KVMTranslationMap::Flush()
{
if (fInvalidPagesCount <= 0)
return;
Thread* thread = thread_get_current_thread();
thread_pin_to_current_cpu(thread);
if (fInvalidPagesCount > PAGE_INVALIDATE_CACHE_SIZE) {
// invalidate all pages
TRACE("flush_tmap: %d pages to invalidate, invalidate all\n",
fInvalidPagesCount);
if (fIsKernelMap) {
arch_cpu_global_TLB_invalidate();
smp_send_broadcast_ici(SMP_MSG_GLOBAL_INVALIDATE_PAGES, 0, 0, 0,
NULL, SMP_MSG_FLAG_SYNC);
} else {
cpu_status state = disable_interrupts();
arch_cpu_user_TLB_invalidate();
restore_interrupts(state);
int cpu = smp_get_current_cpu();
CPUSet cpuMask = PagingStructures()->active_on_cpus;
cpuMask.ClearBit(cpu);
if (!cpuMask.IsEmpty()) {
smp_send_multicast_ici(cpuMask, SMP_MSG_USER_INVALIDATE_PAGES,
0, 0, 0, NULL, SMP_MSG_FLAG_SYNC);
}
}
} else {
TRACE("flush_tmap: %d pages to invalidate, invalidate list\n",
fInvalidPagesCount);
arch_cpu_invalidate_TLB_list(fInvalidPages, fInvalidPagesCount);
if (fIsKernelMap) {
smp_send_broadcast_ici(SMP_MSG_INVALIDATE_PAGE_LIST,
(addr_t)fInvalidPages, fInvalidPagesCount, 0, NULL,
SMP_MSG_FLAG_SYNC);
} else {
int cpu = smp_get_current_cpu();
CPUSet cpuMask = PagingStructures()->active_on_cpus;
cpuMask.ClearBit(cpu);
if (!cpuMask.IsEmpty()) {
smp_send_multicast_ici(cpuMask, SMP_MSG_INVALIDATE_PAGE_LIST,
(addr_t)fInvalidPages, fInvalidPagesCount, 0, NULL,
SMP_MSG_FLAG_SYNC);
}
}
}
fInvalidPagesCount = 0;
thread_unpin_from_current_cpu(thread);
}
/*! Finds a free message and gets it.
NOTE: has side effect of disabling interrupts
return value is the former interrupt state
*/
static cpu_status
find_free_message(struct smp_msg** msg)
{
cpu_status state;
TRACE(("find_free_message: entry\n"));
retry:
while (sFreeMessageCount <= 0) {
state = disable_interrupts();
process_all_pending_ici(smp_get_current_cpu());
restore_interrupts(state);
PAUSE();
}
state = disable_interrupts();
acquire_spinlock(&sFreeMessageSpinlock);
if (sFreeMessageCount <= 0) {
// someone grabbed one while we were getting the lock,
// go back to waiting for it
release_spinlock(&sFreeMessageSpinlock);
restore_interrupts(state);
goto retry;
}
*msg = sFreeMessages;
sFreeMessages = (*msg)->next;
sFreeMessageCount--;
release_spinlock(&sFreeMessageSpinlock);
TRACE(("find_free_message: returning msg %p\n", *msg));
return state;
}
static int32
acpi_cstate_idle(int32 state, CpuidleDevice *device)
{
CpuidleCstate *cState = &device->cStates[state];
acpi_cstate_info *ci = (acpi_cstate_info *)cState->pData;
if (!ci->skip_bm_sts) {
// we fall back to C1 if there's bus master activity
if (acpi_cstate_bm_check())
state = 1;
}
if (ci->type != ACPI_STATE_C3)
acpi_cstate_enter(cState);
// set BM_RLD for Bus Master to activity to wake the system from C3
// With Newer chipsets BM_RLD is a NOP Since DMA is automatically handled
// during C3 State
acpi_cpuidle_driver_info *pi = sAcpiProcessor[smp_get_current_cpu()];
if (pi->flags & ACPI_FLAG_C_BM)
sAcpi->write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
// disable bus master arbitration during C3
if (pi->flags & ACPI_FLAG_C_ARB)
sAcpi->write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
acpi_cstate_enter(cState);
// clear BM_RLD and re-enable the arbiter
if (pi->flags & ACPI_FLAG_C_BM)
sAcpi->write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
if (pi->flags & ACPI_FLAG_C_ARB)
sAcpi->write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
return state;
}
void
SystemProfiler::ThreadEnqueuedInRunQueue(Thread* thread)
{
int cpu = smp_get_current_cpu();
InterruptsSpinLocker locker(fLock, false, !fReentered[cpu]);
// When re-entering, we already hold the lock.
system_profiler_thread_enqueued_in_run_queue* event
= (system_profiler_thread_enqueued_in_run_queue*)
_AllocateBuffer(
sizeof(system_profiler_thread_enqueued_in_run_queue),
B_SYSTEM_PROFILER_THREAD_ENQUEUED_IN_RUN_QUEUE, cpu, 0);
if (event == NULL)
return;
event->time = system_time_nsecs();
event->thread = thread->id;
event->priority = thread->priority;
fHeader->size = fBufferSize;
// Unblock the profiler thread, if necessary, but don't unblock the thread,
// if it had been waiting on a condition variable, since then we'd likely
// deadlock in ConditionVariable::NotifyOne(), as it acquires a static
// spinlock.
if (thread->wait.type != THREAD_BLOCK_TYPE_CONDITION_VARIABLE)
_MaybeNotifyProfilerThreadLocked();
}
void
SystemProfiler::ThreadScheduled(Thread* oldThread, Thread* newThread)
{
int cpu = smp_get_current_cpu();
InterruptsSpinLocker locker(fLock, false, !fReentered[cpu]);
// When re-entering, we already hold the lock.
// If the old thread starts waiting, handle the wait object.
if (oldThread->state == B_THREAD_WAITING)
_WaitObjectUsed((addr_t)oldThread->wait.object, oldThread->wait.type);
system_profiler_thread_scheduled* event
= (system_profiler_thread_scheduled*)
_AllocateBuffer(sizeof(system_profiler_thread_scheduled),
B_SYSTEM_PROFILER_THREAD_SCHEDULED, cpu, 0);
if (event == NULL)
return;
event->time = system_time_nsecs();
event->thread = newThread->id;
event->previous_thread = oldThread->id;
event->previous_thread_state = oldThread->state;
event->previous_thread_wait_object_type = oldThread->wait.type;
event->previous_thread_wait_object = (addr_t)oldThread->wait.object;
fHeader->size = fBufferSize;
// unblock the profiler thread, if necessary
_MaybeNotifyProfilerThreadLocked();
}
static int32
x86_smp_error_interrupt(void *data)
{
// smp error interrupt
TRACE(("smp error interrupt on cpu %" B_PRId32 "\n", smp_get_current_cpu()));
return B_HANDLED_INTERRUPT;
}
static int32
x86_ici_interrupt(void *data)
{
// genuine inter-cpu interrupt
int cpu = smp_get_current_cpu();
TRACE(("inter-cpu interrupt on cpu %d\n", cpu));
return smp_intercpu_int_handler(cpu);
}
void arch_thread_context_switch(struct thread *t_from, struct thread *t_to, struct vm_translation_map_struct *new_tmap)
{
addr_t new_pgdir;
#if 0
int i;
dprintf("arch_thread_context_switch: cpu %d 0x%x -> 0x%x, aspace 0x%x -> 0x%x, old stack = 0x%x:0x%x, stack = 0x%x:0x%x\n",
smp_get_current_cpu(), t_from->id, t_to->id,
t_from->proc->aspace, t_to->proc->aspace,
t_from->arch_info.current_stack.ss, t_from->arch_info.current_stack.esp,
t_to->arch_info.current_stack.ss, t_to->arch_info.current_stack.esp);
#endif
#if 0
for(i=0; i<11; i++)
dprintf("*esp[%d] (0x%x) = 0x%x\n", i, ((unsigned int *)new_at->esp + i), *((unsigned int *)new_at->esp + i));
#endif
x86_64_set_kstack(t_to->kernel_stack_base + KSTACK_SIZE);
#if 0
{
int a = *(int *)(t_to->kernel_stack_base + KSTACK_SIZE - 4);
}
#endif
if(t_from->proc->aspace_id >= 0 && t_to->proc->aspace_id >= 0) {
// they are both uspace threads
if(t_from->proc->aspace_id == t_to->proc->aspace_id) {
// dont change the pgdir, same address space
new_pgdir = NULL;
} else {
// switching to a new address space
new_pgdir = vm_translation_map_get_pgdir(&t_to->proc->aspace->translation_map);
}
} else if(t_from->proc->aspace_id < 0 && t_to->proc->aspace_id < 0) {
// they must both be kspace threads
new_pgdir = NULL;
} else if(t_to->proc->aspace_id < 0) {
// the one we're switching to is kspace
new_pgdir = vm_translation_map_get_pgdir(&t_to->proc->kaspace->translation_map);
} else {
new_pgdir = vm_translation_map_get_pgdir(&t_to->proc->aspace->translation_map);
}
#if 0
dprintf("new_pgdir is 0x%x\n", new_pgdir);
#endif
#if 0
{
int a = *(int *)(t_to->arch_info.current_stack.esp - 4);
}
#endif
if((new_pgdir % PAGE_SIZE) != 0)
panic("arch_thread_context_switch: bad pgdir %p\n", (void*)new_pgdir);
x86_64_fsave_swap(t_from->arch_info.fpu_state, t_to->arch_info.fpu_state);
x86_64_context_switch(&t_from->arch_info.sp, t_to->arch_info.sp, new_pgdir);
}
void
smp_send_ici(int32 targetCPU, int32 message, addr_t data, addr_t data2,
addr_t data3, void* dataPointer, uint32 flags)
{
struct smp_msg *msg;
TRACE(("smp_send_ici: target 0x%lx, mess 0x%lx, data 0x%lx, data2 0x%lx, "
"data3 0x%lx, ptr %p, flags 0x%lx\n", targetCPU, message, data, data2,
data3, dataPointer, flags));
if (sICIEnabled) {
int state;
int currentCPU;
// find_free_message leaves interrupts disabled
state = find_free_message(&msg);
currentCPU = smp_get_current_cpu();
if (targetCPU == currentCPU) {
return_free_message(msg);
restore_interrupts(state);
return; // nope, cant do that
}
// set up the message
msg->message = message;
msg->data = data;
msg->data2 = data2;
msg->data3 = data3;
msg->data_ptr = dataPointer;
msg->ref_count = 1;
msg->flags = flags;
msg->done = false;
// stick it in the appropriate cpu's mailbox
acquire_spinlock_nocheck(&sCPUMessageSpinlock[targetCPU]);
msg->next = sCPUMessages[targetCPU];
sCPUMessages[targetCPU] = msg;
release_spinlock(&sCPUMessageSpinlock[targetCPU]);
arch_smp_send_ici(targetCPU);
if ((flags & SMP_MSG_FLAG_SYNC) != 0) {
// wait for the other cpu to finish processing it
// the interrupt handler will ref count it to <0
// if the message is sync after it has removed it from the mailbox
while (msg->done == false) {
process_all_pending_ici(currentCPU);
PAUSE();
}
// for SYNC messages, it's our responsibility to put it
// back into the free list
return_free_message(msg);
}
restore_interrupts(state);
}
}
static int32
x86_spurious_interrupt(void *data)
{
// spurious interrupt
TRACE(("spurious interrupt on cpu %" B_PRId32 "\n", smp_get_current_cpu()));
// spurious interrupts must not be acknowledged as it does not expect
// a end of interrupt - if we still do it we would loose the next best
// interrupt
return B_HANDLED_INTERRUPT;
}
static void
push_latency(spinlock* lock)
{
if (!sEnableLatencyCheck)
return;
int32 cpu = smp_get_current_cpu();
int32 index = (++sLatencyIndex[cpu]) % NUM_LATENCY_LOCKS;
sLatency[cpu][index].lock = lock;
sLatency[cpu][index].timestamp = system_time();
}
void
acquire_spinlock(spinlock* lock)
{
#if DEBUG_SPINLOCKS
if (are_interrupts_enabled()) {
panic("acquire_spinlock: attempt to acquire lock %p with interrupts "
"enabled", lock);
}
#endif
if (sNumCPUs > 1) {
int currentCPU = smp_get_current_cpu();
#if B_DEBUG_SPINLOCK_CONTENTION
while (atomic_add(&lock->lock, 1) != 0)
process_all_pending_ici(currentCPU);
#else
while (1) {
uint32 count = 0;
while (*lock != 0) {
if (++count == SPINLOCK_DEADLOCK_COUNT) {
panic("acquire_spinlock(): Failed to acquire spinlock %p "
"for a long time!", lock);
count = 0;
}
process_all_pending_ici(currentCPU);
PAUSE();
}
if (atomic_or((int32*)lock, 1) == 0)
break;
}
# if DEBUG_SPINLOCKS
push_lock_caller(arch_debug_get_caller(), lock);
# endif
#endif
} else {
#if DEBUG_SPINLOCKS
int32 oldValue;
oldValue = atomic_or((int32*)lock, 1);
if (oldValue != 0) {
panic("acquire_spinlock: attempt to acquire lock %p twice on "
"non-SMP system (last caller: %p, value %" B_PRId32 ")", lock,
find_lock_caller(lock), oldValue);
}
push_lock_caller(arch_debug_get_caller(), lock);
#endif
}
#if DEBUG_SPINLOCK_LATENCIES
push_latency(lock);
#endif
}
/*! Notifies the profiler thread when the profiling buffer is full enough.
The caller must hold fLock.
*/
inline void
SystemProfiler::_MaybeNotifyProfilerThreadLocked()
{
// If the buffer is full enough, notify the profiler.
if (fWaitingProfilerThread != NULL && fBufferSize > fBufferCapacity / 2) {
int cpu = smp_get_current_cpu();
fReentered[cpu] = true;
SpinLocker _(fWaitingProfilerThread->scheduler_lock);
thread_unblock_locked(fWaitingProfilerThread, B_OK);
fWaitingProfilerThread = NULL;
fReentered[cpu] = false;
}
}
static void
test_latency(spinlock* lock)
{
if (!sEnableLatencyCheck)
return;
int32 cpu = smp_get_current_cpu();
for (int32 i = 0; i < NUM_LATENCY_LOCKS; i++) {
if (sLatency[cpu][i].lock == lock) {
bigtime_t diff = system_time() - sLatency[cpu][i].timestamp;
if (diff > DEBUG_LATENCY && diff < 500000) {
panic("spinlock %p were held for %lld usecs (%d allowed)\n",
lock, diff, DEBUG_LATENCY);
}
sLatency[cpu][i].lock = NULL;
}
}
}
void
call_all_cpus_sync(void (*func)(void*, int), void* cookie)
{
cpu_status state = disable_interrupts();
// if inter-CPU communication is not yet enabled, use the early mechanism
if (!sICIEnabled) {
call_all_cpus_early(func, cookie);
restore_interrupts(state);
return;
}
if (smp_get_num_cpus() > 1) {
smp_send_broadcast_ici(SMP_MSG_CALL_FUNCTION, (addr_t)cookie,
0, 0, (void*)func, SMP_MSG_FLAG_SYNC);
}
// we need to call this function ourselves as well
func(cookie, smp_get_current_cpu());
restore_interrupts(state);
}
void
SystemProfiler::ThreadRemovedFromRunQueue(Thread* thread)
{
int cpu = smp_get_current_cpu();
InterruptsSpinLocker locker(fLock, false, !fReentered[cpu]);
// When re-entering, we already hold the lock.
system_profiler_thread_removed_from_run_queue* event
= (system_profiler_thread_removed_from_run_queue*)
_AllocateBuffer(
sizeof(system_profiler_thread_removed_from_run_queue),
B_SYSTEM_PROFILER_THREAD_REMOVED_FROM_RUN_QUEUE, cpu, 0);
if (event == NULL)
return;
event->time = system_time_nsecs();
event->thread = thread->id;
fHeader->size = fBufferSize;
// unblock the profiler thread, if necessary
_MaybeNotifyProfilerThreadLocked();
}
static inline depot_cpu_store*
object_depot_cpu(object_depot* depot)
{
return &depot->stores[smp_get_current_cpu()];
}
void
x86_page_fault_exception(struct iframe* frame)
{
Thread* thread = thread_get_current_thread();
addr_t cr2 = x86_read_cr2();
addr_t newip;
if (debug_debugger_running()) {
// If this CPU or this thread has a fault handler, we're allowed to be
// here.
if (thread != NULL) {
cpu_ent* cpu = &gCPU[smp_get_current_cpu()];
if (cpu->fault_handler != 0) {
debug_set_page_fault_info(cr2, frame->ip,
(frame->error_code & 0x2) != 0
? DEBUG_PAGE_FAULT_WRITE : 0);
frame->ip = cpu->fault_handler;
frame->bp = cpu->fault_handler_stack_pointer;
return;
}
if (thread->fault_handler != 0) {
kprintf("ERROR: thread::fault_handler used in kernel "
"debugger!\n");
debug_set_page_fault_info(cr2, frame->ip,
(frame->error_code & 0x2) != 0
? DEBUG_PAGE_FAULT_WRITE : 0);
frame->ip = reinterpret_cast<uintptr_t>(thread->fault_handler);
return;
}
}
// otherwise, not really
panic("page fault in debugger without fault handler! Touching "
"address %p from ip %p\n", (void*)cr2, (void*)frame->ip);
return;
} else if ((frame->flags & 0x200) == 0) {
// interrupts disabled
// If a page fault handler is installed, we're allowed to be here.
// TODO: Now we are generally allowing user_memcpy() with interrupts
// disabled, which in most cases is a bug. We should add some thread
// flag allowing to explicitly indicate that this handling is desired.
uintptr_t handler = reinterpret_cast<uintptr_t>(thread->fault_handler);
if (thread && thread->fault_handler != 0) {
if (frame->ip != handler) {
frame->ip = handler;
return;
}
// The fault happened at the fault handler address. This is a
// certain infinite loop.
panic("page fault, interrupts disabled, fault handler loop. "
"Touching address %p from ip %p\n", (void*)cr2,
(void*)frame->ip);
}
// If we are not running the kernel startup the page fault was not
// allowed to happen and we must panic.
panic("page fault, but interrupts were disabled. Touching address "
"%p from ip %p\n", (void*)cr2, (void*)frame->ip);
return;
} else if (thread != NULL && thread->page_faults_allowed < 1) {
panic("page fault not allowed at this place. Touching address "
"%p from ip %p\n", (void*)cr2, (void*)frame->ip);
return;
}
enable_interrupts();
vm_page_fault(cr2, frame->ip,
(frame->error_code & 0x2)!= 0, // write access
(frame->error_code & 0x10) != 0, // instruction fetch
(frame->error_code & 0x4) != 0, // userland
&newip);
if (newip != 0) {
// the page fault handler wants us to modify the iframe to set the
// IP the cpu will return to this ip
frame->ip = newip;
}
}
RTDECL(RTCPUID) RTMpCpuId(void)
{
return smp_get_current_cpu();
}
extern "C" void
arch_arm_data_abort(struct iframe *frame)
{
Thread *thread = thread_get_current_thread();
bool isUser = (frame->spsr & 0x1f) == 0x10;
addr_t far = arm_get_far();
bool isWrite = true;
addr_t newip = 0;
#ifdef TRACE_ARCH_INT
print_iframe("Data Abort", frame);
dprintf("FAR: %08lx, thread: %s\n", far, thread->name);
#endif
IFrameScope scope(frame);
if (debug_debugger_running()) {
// If this CPU or this thread has a fault handler, we're allowed to be
// here.
if (thread != NULL) {
cpu_ent* cpu = &gCPU[smp_get_current_cpu()];
if (cpu->fault_handler != 0) {
debug_set_page_fault_info(far, frame->pc,
isWrite ? DEBUG_PAGE_FAULT_WRITE : 0);
frame->svc_sp = cpu->fault_handler_stack_pointer;
frame->pc = cpu->fault_handler;
return;
}
if (thread->fault_handler != 0) {
kprintf("ERROR: thread::fault_handler used in kernel "
"debugger!\n");
debug_set_page_fault_info(far, frame->pc,
isWrite ? DEBUG_PAGE_FAULT_WRITE : 0);
frame->pc = thread->fault_handler;
return;
}
}
// otherwise, not really
panic("page fault in debugger without fault handler! Touching "
"address %p from pc %p\n", (void *)far, (void *)frame->pc);
return;
} else if ((frame->spsr & (1 << 7)) != 0) {
// interrupts disabled
// If a page fault handler is installed, we're allowed to be here.
// TODO: Now we are generally allowing user_memcpy() with interrupts
// disabled, which in most cases is a bug. We should add some thread
// flag allowing to explicitly indicate that this handling is desired.
if (thread && thread->fault_handler != 0) {
if (frame->pc != thread->fault_handler) {
frame->pc = thread->fault_handler;
return;
}
// The fault happened at the fault handler address. This is a
// certain infinite loop.
panic("page fault, interrupts disabled, fault handler loop. "
"Touching address %p from pc %p\n", (void*)far,
(void*)frame->pc);
}
// If we are not running the kernel startup the page fault was not
// allowed to happen and we must panic.
panic("page fault, but interrupts were disabled. Touching address "
"%p from pc %p\n", (void *)far, (void *)frame->pc);
return;
} else if (thread != NULL && thread->page_faults_allowed < 1) {
panic("page fault not allowed at this place. Touching address "
"%p from pc %p\n", (void *)far, (void *)frame->pc);
return;
}
enable_interrupts();
vm_page_fault(far, frame->pc, isWrite, false, isUser, &newip);
if (newip != 0) {
// the page fault handler wants us to modify the iframe to set the
// IP the cpu will return to to be this ip
frame->pc = newip;
}
}
void
smp_send_broadcast_ici(int32 message, addr_t data, addr_t data2, addr_t data3,
void *dataPointer, uint32 flags)
{
struct smp_msg *msg;
TRACE(("smp_send_broadcast_ici: cpu %ld mess 0x%lx, data 0x%lx, data2 "
"0x%lx, data3 0x%lx, ptr %p, flags 0x%lx\n", smp_get_current_cpu(),
message, data, data2, data3, dataPointer, flags));
if (sICIEnabled) {
int state;
int currentCPU;
// find_free_message leaves interrupts disabled
state = find_free_message(&msg);
currentCPU = smp_get_current_cpu();
msg->message = message;
msg->data = data;
msg->data2 = data2;
msg->data3 = data3;
msg->data_ptr = dataPointer;
msg->ref_count = sNumCPUs - 1;
msg->flags = flags;
msg->proc_bitmap = SET_BIT(0, currentCPU);
msg->done = false;
TRACE(("smp_send_broadcast_ici%d: inserting msg %p into broadcast "
"mbox\n", currentCPU, msg));
// stick it in the appropriate cpu's mailbox
acquire_spinlock_nocheck(&sBroadcastMessageSpinlock);
msg->next = sBroadcastMessages;
sBroadcastMessages = msg;
release_spinlock(&sBroadcastMessageSpinlock);
arch_smp_send_broadcast_ici();
TRACE(("smp_send_broadcast_ici: sent interrupt\n"));
if ((flags & SMP_MSG_FLAG_SYNC) != 0) {
// wait for the other cpus to finish processing it
// the interrupt handler will ref count it to <0
// if the message is sync after it has removed it from the mailbox
TRACE(("smp_send_broadcast_ici: waiting for ack\n"));
while (msg->done == false) {
process_all_pending_ici(currentCPU);
PAUSE();
}
TRACE(("smp_send_broadcast_ici: returning message to free list\n"));
// for SYNC messages, it's our responsibility to put it
// back into the free list
return_free_message(msg);
}
restore_interrupts(state);
}
TRACE(("smp_send_broadcast_ici: done\n"));
}
void
smp_send_multicast_ici(cpu_mask_t cpuMask, int32 message, addr_t data,
addr_t data2, addr_t data3, void *dataPointer, uint32 flags)
{
if (!sICIEnabled)
return;
int currentCPU = smp_get_current_cpu();
cpuMask &= ~((cpu_mask_t)1 << currentCPU)
& (((cpu_mask_t)1 << sNumCPUs) - 1);
if (cpuMask == 0) {
panic("smp_send_multicast_ici(): 0 CPU mask");
return;
}
// count target CPUs
int32 targetCPUs = 0;
for (int32 i = 0; i < sNumCPUs; i++) {
if ((cpuMask & (cpu_mask_t)1 << i) != 0)
targetCPUs++;
}
// find_free_message leaves interrupts disabled
struct smp_msg *msg;
int state = find_free_message(&msg);
msg->message = message;
msg->data = data;
msg->data2 = data2;
msg->data3 = data3;
msg->data_ptr = dataPointer;
msg->ref_count = targetCPUs;
msg->flags = flags;
msg->proc_bitmap = ~cpuMask;
msg->done = false;
// stick it in the broadcast mailbox
acquire_spinlock_nocheck(&sBroadcastMessageSpinlock);
msg->next = sBroadcastMessages;
sBroadcastMessages = msg;
release_spinlock(&sBroadcastMessageSpinlock);
arch_smp_send_broadcast_ici();
// TODO: Introduce a call that only bothers the target CPUs!
if ((flags & SMP_MSG_FLAG_SYNC) != 0) {
// wait for the other cpus to finish processing it
// the interrupt handler will ref count it to <0
// if the message is sync after it has removed it from the mailbox
while (msg->done == false) {
process_all_pending_ici(currentCPU);
PAUSE();
}
// for SYNC messages, it's our responsibility to put it
// back into the free list
return_free_message(msg);
}
restore_interrupts(state);
}