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Kernel: Allow demand paging only for userspace threads

This commit is contained in:
Bananymous 2024-04-17 00:55:45 +03:00
parent f9943b60e4
commit a40ef610a2
2 changed files with 20 additions and 16 deletions
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2
kernel/include/kernel/Thread.h
View File

@ -61,7 +61,7 @@ namespace Kernel
vaddr_t kernel_stack_top() const { return m_kernel_stack->vaddr() + m_kernel_stack->size(); }
VirtualRange& kernel_stack() { return *m_kernel_stack; }
vaddr_t userspace_stack_bottom() const { return is_userspace() ? m_userspace_stack->vaddr() : 0; }
vaddr_t userspace_stack_bottom() const { return is_userspace() ? m_userspace_stack->vaddr() : UINTPTR_MAX; }
vaddr_t userspace_stack_top() const { return is_userspace() ? m_userspace_stack->vaddr() + m_userspace_stack->size() : 0; }
VirtualRange& userspace_stack() { ASSERT(is_userspace()); return *m_userspace_stack; }

34
kernel/kernel/IDT.cpp
View File

@ -194,23 +194,27 @@ namespace Kernel
goto done;
}
// Try demand paging on non present pages
PageFaultError page_fault_error;
page_fault_error.raw = error;
if (!page_fault_error.present)
// Demand paging is only supported in userspace
if (thread.is_userspace())
{
Processor::set_interrupt_state(InterruptState::Enabled);
auto result = Process::current().allocate_page_for_demand_paging(regs->cr2);
Processor::set_interrupt_state(InterruptState::Disabled);
if (!result.is_error() && result.value())
goto done;
if (result.is_error())
// Try demand paging on non present pages
PageFaultError page_fault_error;
page_fault_error.raw = error;
if (!page_fault_error.present)
{
dwarnln("Demand paging: {}", result.error());
Thread::current().handle_signal(SIGKILL);
goto done;
Processor::set_interrupt_state(InterruptState::Enabled);
auto result = Process::current().allocate_page_for_demand_paging(regs->cr2);
Processor::set_interrupt_state(InterruptState::Disabled);
if (!result.is_error() && result.value())
goto done;
if (result.is_error())
{
dwarnln("Demand paging: {}", result.error());
Thread::current().handle_signal(SIGKILL);
goto done;
}
}
}
}