4245798955
mostly include some things that should and remove some things that shouldn't have been included in the handout (yes this does hint at some places that need to be touched for A2)
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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#include "memory/pagefault.h"
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#include "arch/core.h"
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#include "arch/core_interrupt.h"
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#include "arch/idt.h"
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#include "debug/output.h"
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#include "memory/config.h"
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namespace PageFault {
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union ErrorCode {
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uint32_t value;
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struct {
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uint32_t present : 1; ///< was the page present?
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uint32_t write : 1; ///< was the access a write?
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uint32_t usermode : 1; ///< was it in user mode?
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uint32_t reserved : 1; ///< reserved bit violation
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uint32_t instruction : 1; ///< was it caused by instruction fetch?
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uint32_t : 0;
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} __attribute__((packed));
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explicit ErrorCode(uint32_t value) : value(value) {}
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};
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assert_size(ErrorCode, 4);
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[[gnu::interrupt]] static void pagefault_handler(InterruptContext *context,
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uint64_t err) {
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PageFault::ErrorCode error(err);
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// Get the faulting address
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uintptr_t virt = 0;
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asm volatile("mov %%cr2, %0" : "=r"(virt));
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DBG << "Page fault at " << hex << virt << dec << endl;
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// show page fault message
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DBG << "PAGEFAULT: " << hex << virt << ":" << dec << error.present
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<< error.write << error.usermode << error.reserved << error.instruction
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<< " @ " << hex << context->ip << endl;
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Core::die();
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}
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void init() {
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IDT::set(Core::Interrupt::Vector::PAGE_FAULT,
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IDT::InterruptDescriptor::ReturningWithError(pagefault_handler));
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}
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} // namespace PageFault
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