int mm_allocate_dma_buffer(struct dma_region *d)
{
if (!atomic_exchange(&dma_virtual_init, true)) {
valloc_create(&dma_virtual, MEMMAP_VIRTDMA_START, MEMMAP_VIRTDMA_END, mm_page_size(0), 0);
}
d->p.address = mm_physical_allocate(d->p.size, false);
if (d->p.address == 0)
return -1;
struct valloc_region reg;
int npages = (d->p.size - 1) / mm_page_size(0) + 1;
valloc_allocate(&dma_virtual, ®, npages);
for (int i = 0; i < npages; i++)
mm_virtual_map(reg.start + i * mm_page_size(0), d->p.address + i * mm_page_size(0), PAGE_PRESENT | PAGE_WRITE, mm_page_size(0));
d->v = reg.start;
return 0;
}
static void preexec(void)
{
struct thread *t = current_thread;
/* unmap all mappings, specified by POSIX */
mm_destroy_all_mappings(t->process);
mm_virtual_map(MEMMAP_SYSGATE_ADDRESS, sysgate_page, PAGE_PRESENT | PAGE_USER, PAGE_SIZE);
/* we need to re-create the vmem for memory mappings */
valloc_create(&(t->process->mmf_valloc), MEMMAP_MMAP_BEGIN, MEMMAP_MMAP_END, PAGE_SIZE, 0);
addr_t ret = mm_mmap(t->usermode_stack_start, CONFIG_STACK_PAGES * PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, 0, 0, 0);
mm_page_fault_test_mappings(t->usermode_stack_end - PAGE_SIZE, PF_CAUSE_USER | PF_CAUSE_WRITE);
t->signal = t->signals_pending = 0;
memset((void *)t->process->signal_act, 0, sizeof(struct sigaction) * NUM_SIGNALS);
if(t->flags & THREAD_PTRACED) {
tm_signal_send_thread(t, SIGTRAP);
}
}
void tm_init_multitasking(void)
{
printk(KERN_DEBUG, "[sched]: Starting multitasking system...\n");
sysgate_page = mm_physical_allocate(PAGE_SIZE, true);
mm_physical_memcpy((void *)sysgate_page,
(void *)signal_return_injector, MEMMAP_SYSGATE_ADDRESS_SIZE, PHYS_MEMCPY_MODE_DEST);
process_table = hash_create(0, 0, 128);
process_list = linkedlist_create(0, LINKEDLIST_MUTEX);
mutex_create(&process_refs_lock, 0);
mutex_create(&thread_refs_lock, 0);
thread_table = hash_create(0, 0, 128);
struct thread *thread = kmalloc(sizeof(struct thread));
struct process *proc = kernel_process = kmalloc(sizeof(struct process));
proc->refs = 2;
thread->refs = 1;
hash_insert(process_table, &proc->pid, sizeof(proc->pid), &proc->hash_elem, proc);
hash_insert(thread_table, &thread->tid, sizeof(thread->tid), &thread->hash_elem, thread);
linkedlist_insert(process_list, &proc->listnode, proc);
valloc_create(&proc->mmf_valloc, MEMMAP_MMAP_BEGIN, MEMMAP_MMAP_END, PAGE_SIZE, 0);
linkedlist_create(&proc->threadlist, 0);
mutex_create(&proc->map_lock, 0);
mutex_create(&proc->stacks_lock, 0);
mutex_create(&proc->fdlock, 0);
hash_create(&proc->files, HASH_LOCKLESS, 64);
proc->magic = PROCESS_MAGIC;
blocklist_create(&proc->waitlist, 0, "process-waitlist");
mutex_create(&proc->fdlock, 0);
memcpy(&proc->vmm_context, &kernel_context, sizeof(kernel_context));
thread->process = proc; /* we have to do this early, so that the vmm system can use the lock... */
thread->state = THREADSTATE_RUNNING;
thread->magic = THREAD_MAGIC;
workqueue_create(&thread->resume_work, 0);
thread->kernel_stack = (addr_t)&initial_kernel_stack;
spinlock_create(&thread->status_lock);
primary_cpu->active_queue = tqueue_create(0, 0);
primary_cpu->idle_thread = thread;
primary_cpu->numtasks=1;
ticker_create(&primary_cpu->ticker, 0);
workqueue_create(&primary_cpu->work, 0);
tm_thread_add_to_process(thread, proc);
tm_thread_add_to_cpu(thread, primary_cpu);
atomic_fetch_add_explicit(&running_processes, 1, memory_order_relaxed);
atomic_fetch_add_explicit(&running_threads, 1, memory_order_relaxed);
set_ksf(KSF_THREADING);
*(struct thread **)(thread->kernel_stack) = thread;
primary_cpu->flags |= CPU_RUNNING;
#if CONFIG_MODULES
loader_add_kernel_symbol(tm_thread_delay_sleep);
loader_add_kernel_symbol(tm_thread_delay);
loader_add_kernel_symbol(tm_timing_get_microseconds);
loader_add_kernel_symbol(tm_thread_set_state);
loader_add_kernel_symbol(tm_thread_exit);
loader_add_kernel_symbol(tm_thread_poke);
loader_add_kernel_symbol(tm_thread_block);
loader_add_kernel_symbol(tm_thread_got_signal);
loader_add_kernel_symbol(tm_thread_unblock);
loader_add_kernel_symbol(tm_blocklist_wakeall);
loader_add_kernel_symbol(kthread_create);
loader_add_kernel_symbol(kthread_wait);
loader_add_kernel_symbol(kthread_join);
loader_add_kernel_symbol(kthread_kill);
loader_add_kernel_symbol(tm_schedule);
loader_add_kernel_symbol(arch_tm_get_current_thread);
#endif
}
