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Scheduler: add a reset_task function

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This can be used later to implement execve()
This commit is contained in:
apio 2022-10-12 17:08:45 +02:00
parent 4e3ef9593d
commit 136c0b3ae9
2 changed files with 21 additions and 0 deletions
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2
kernel/include/thread/Scheduler.h
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@ -22,4 +22,6 @@ namespace Scheduler
void reap_task(Task* task);
void reap_tasks();
void reset_task(Task* task, ELFImage* new_image);
}

19
kernel/src/thread/Scheduler.cpp
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@ -152,6 +152,25 @@ void Scheduler::load_user_task(const char* filename)
new_task->id, new_task->regs.rsp, task_num);
}
void Scheduler::reset_task(Task* task, ELFImage* new_image)
{
task->state = task->Running;
task->regs.rip = new_image->entry;
task->image = new_image;
task->allocated_stack = (uint64_t)MemoryManager::get_pages(
TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER); // 16 KB is enough for everyone, right?
task->regs.rsp = Utilities::get_top_of_stack(task->allocated_stack, TASK_PAGES_IN_STACK);
task->regs.cs = 0x18 | 0x03;
task->regs.ss = 0x20 | 0x03;
task->regs.ds = 0x20 | 0x03;
task->regs.rflags = (1 << 21) | (1 << 9); // enable interrupts
task->task_sleep = 0;
task->task_time = 0;
task->cpu_time = 0;
kinfoln("Resetting task: loaded at %lx, tid %ld, stack at %lx, total tasks: %ld", task->regs.rip, task->id,
task->regs.rsp, task_num);
}
void Scheduler::reap_task(Task* task)
{
ASSERT(!Interrupts::is_in_handler());