int kernel_start()
{
int i;
// point to low address (0GB ~ ...)
pgd_tmp[PGD_INDEX(0)] =
(uint32_t)pte_low | PAGE_PRESENT | PAGE_WRITE;
// point to high address (3GB ~ 4GB)
pgd_tmp[PGD_INDEX(PAGE_OFFSET)] =
(uint32_t)pte_hig | PAGE_PRESENT | PAGE_WRITE;
for (i = 0; i < 1024; i++) {
pte_low[i] = (i << 12) | PAGE_PRESENT | PAGE_WRITE;
}
for (i = 0; i < 1024; i++) {
pte_hig[i] = (i << 12) | PAGE_PRESENT | PAGE_WRITE;
}
// set page directory
set_cr3(pgd_tmp);
page_on();
kernel_stack_top = ((uint32_t)kernel_stack + STACK_SIZE) & 0xFFFFFFF0;
set_esp(kernel_stack_top);
global_mboot_ptr =
(multiboot_t *)((uint32_t)global_mboot_tmp + PAGE_OFFSET);
kernel_init();
return 0;
}
void phantom_thread_in_interrupt_fork()
{
SHOW_INFO0( 10, "ifork in...");
assert( forkLock.lock != 0 );
hal_spin_lock(&schedlock);
child = get_thread(GET_CURRENT_THREAD()->child_tid);
parent = GET_CURRENT_THREAD();
//#warning cli
// Save to me, switch to me
SHOW_INFO0( 10, "ifork save...");
phantom_switch_context(parent, parent, &schedlock );
SHOW_INFO0( 10, "ifork saved...");
// (OLD) phantom_switch_context() below returns here in old thread!!
if(!(parent->thread_flags & THREAD_FLAG_PREFORK))
{
set_esp(old_sp);
SHOW_INFO0( 10, "ifork in old...");
// Second return. We're in old tread and done with fork;
//GET_CURRENT_THREAD() = parent;
SET_CURRENT_THREAD(parent);
// Let child be elegible to run
child->sleep_flags &= ~THREAD_SLEEP_LOCKED;
t_enqueue_runq(child);
return;
}
SHOW_INFO0( 10, "ifork cont...");
parent->thread_flags &= ~THREAD_FLAG_PREFORK;
//GET_CURRENT_THREAD() = child;
SET_CURRENT_THREAD(child);
// Now switch stack and copy some 512 bytes there to make sure
// new one will have some place to return to
int cp_size = 512;
void *from = (void*) (old_sp = get_esp());
void *to = (child->stack) - cp_size - 1;
SHOW_INFO0( 10, "ifork memmove...");
memmove(to, from, cp_size);
//printf("set ESP...\n");
SHOW_INFO0( 10, "set ESP...");
set_esp((int)to);
//#warning sti
// Save to new, switch to me -- WILL RETURN TO (X)
//printf("ifork GO...\n");
phantom_switch_context(child, parent, &schedlock );
// (NEW) phantom_switch_context() below returns here in new thread!!
//printf("ifork in NEW...\n");
}