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Move userspace task to userspace memory

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This commit is contained in:
apio 2022-10-17 17:30:05 +02:00
parent b334e1cd50
commit 966fdc76d7
2 changed files with 7 additions and 23 deletions
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18
kernel/src/sys/exec.cpp
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@ -50,20 +50,9 @@ void sys_exec(Context* context, const char* pathname)
return;
}
uint64_t allocated_stack = (uint64_t)MemoryManager::get_pages(TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER);
if (!allocated_stack)
{
kfree(kpathname);
context->rax = -ENOMEM;
return;
}
uint64_t allocated_stack_phys = VMM::get_physical(allocated_stack);
if ((uint64_t)memusage > PMM::get_free())
{
kfree(kpathname);
MemoryManager::release_pages((void*)allocated_stack, TASK_PAGES_IN_STACK);
context->rax = -ENOMEM;
return;
}
@ -80,13 +69,6 @@ void sys_exec(Context* context, const char* pathname)
ASSERT(image); // If check_elf_image succeeded, load_elf_from_vfs MUST succeed, unless something has gone terribly
// wrong.
task->allocated_stack = allocated_stack;
for (uint64_t i = 0; i < TASK_PAGES_IN_STACK; i++)
{
VMM::map(allocated_stack + (i * PAGE_SIZE), allocated_stack_phys + (i * PAGE_SIZE), MAP_READ_WRITE | MAP_USER);
}
Scheduler::reset_task(task, image);
task->restore_context(context);

12
kernel/src/thread/Scheduler.cpp
View File

@ -112,8 +112,8 @@ Task* Scheduler::create_user_task()
memset(&new_task->regs, 0, sizeof(Context));
new_task->user_task = true;
new_task->id = free_tid++;
new_task->allocated_stack = (uint64_t)MemoryManager::get_pages(
TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER); // 16 KB is enough for everyone, right?
new_task->allocated_stack = (uint64_t)MemoryManager::get_pages_at(
0x100000, TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER); // 16 KB is enough for everyone, right?
new_task->regs.rsp = get_top_of_stack(new_task->allocated_stack, TASK_PAGES_IN_STACK);
new_task->task_sleep = 0;
new_task->task_time = 0;
@ -148,12 +148,14 @@ long Scheduler::load_user_task(const char* filename)
new_task->user_task = true;
new_task->regs.rip = image->entry;
new_task->image = image;
new_task->allocated_stack = (uint64_t)MemoryManager::get_pages(
TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER); // 16 KB is enough for everyone, right?
new_task->allocated_stack = (uint64_t)MemoryManager::get_pages_at(
0x100000, TASK_PAGES_IN_STACK, MAP_READ_WRITE | MAP_USER); // 16 KB is enough for everyone, right?
if (!new_task->allocated_stack)
{
delete new_task;
ELFLoader::release_elf_image(image);
VMM::switch_back_to_kernel_address_space();
Interrupts::pop();
return -ENOMEM;
}
new_task->regs.rsp = get_top_of_stack(new_task->allocated_stack, TASK_PAGES_IN_STACK);
@ -204,7 +206,7 @@ void Scheduler::reap_task(Task* task)
VMM::switch_to_user_address_space(exiting_task->address_space);
}
kinfoln("reaping task %ld, exited with code %ld", exiting_task->id, exiting_task->exit_status);
if (exiting_task->allocated_stack)
if (exiting_task->allocated_stack && !exiting_task->is_user_task())
MemoryManager::release_pages((void*)exiting_task->allocated_stack, TASK_PAGES_IN_STACK);
if (exiting_task->image) // FIXME: Also free pages the task has mmap-ed but not munmap-ed.
{