MaxOS::hardwarecommunication::PageFaultHandler Class Reference

Handles a page fault exception. More...

#include <interrupts.h>

Inheritance diagram for MaxOS::hardwarecommunication::PageFaultHandler:

Public Member Functions
	PageFaultHandler ()
	Create a new PageFaultHandler.
string	get_message (system::cpu_status_t *status) final
	Get an human readable error message explaining this exception.
Public Member Functions inherited from MaxOS::hardwarecommunication::ExceptionHandler
	ExceptionHandler (uint8_t interrupt_number)
	Create a new base exception handler for an interrupt.
	~ExceptionHandler ()
virtual system::cpu_status_t *	handle_interrupt (system::cpu_status_t *status)
	Handle the interrupt relating to this exception.
Public Member Functions inherited from MaxOS::hardwarecommunication::InterruptHandler
virtual void	handle_interrupt ()
	Handles an interrupt.

Additional Inherited Members
Protected Member Functions inherited from MaxOS::hardwarecommunication::InterruptHandler
	InterruptHandler (uint8_t interrupt_number, int64_t redirect=-1, uint64_t redirect_index=0)
	Creates a new interrupt handler and registers it with the interrupt manager.
virtual	~InterruptHandler ()
	Destroys the interrupt handler and unregisters it from the interrupt manager.
Protected Attributes inherited from MaxOS::hardwarecommunication::InterruptHandler
uint8_t	m_interrupt_number
	The interrupt number this handler handles.

Detailed Description

Handles a page fault exception.

Definition at line 115 of file interrupts.h.

Constructor & Destructor Documentation

PageFaultHandler()

MaxOS::hardwarecommunication::PageFaultHandler::PageFaultHandler ( )

inline

Create a new PageFaultHandler.

Definition at line 119 of file interrupts.h.

: ExceptionHandler(0x0E) { }

Member Function Documentation

get_message()

string PageFaultHandler::get_message ( system::cpu_status_t *  status )

finalvirtual

Get an human readable error message explaining this exception.

Parameters

status

The CPU state at time of exception

Returns

The error message

Reimplemented from MaxOS::hardwarecommunication::ExceptionHandler.

Definition at line 176 of file interrupts.cpp.

                                                         {
 
    // Extract the information about the fault
    bool present = (status->error_code & 0x1) != 0;
    bool write = (status->error_code & 0x2) != 0;
    bool user_mode = (status->error_code & 0x4) != 0;
    bool reserved_write = (status->error_code & 0x8) != 0;
    bool instruction_fetch = (status->error_code & 0x10) != 0;
    uint64_t faulting_address;
    asm volatile("movq %%cr2, %0" : "=r" (faulting_address));
 
    return StringBuilder() << "Page Fault: " << (user_mode ? "user" : "kernel")  << " code at 0x" << status->rip << " tried to " << (write ? "write" : "read") << " address 0x" << faulting_address << " which is " << (present ? "" : "not") << " mapped and " << (reserved_write ? "" : "not") << " reserved. " << " (instruction fetch: " << (instruction_fetch ? "Yes" : "No") << ")\n";
}

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The documentation for this class was generated from the following files:

• /home/runner/work/MaxOS/MaxOS/kernel/include/hardwarecommunication/interrupts.h
• /home/runner/work/MaxOS/MaxOS/kernel/src/hardwarecommunication/interrupts.cpp