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KPT global variable

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This commit is contained in:
Alex
2022-12-06 09:30:09 +02:00
parent 3454c9692f
commit f86777a856
4 changed files with 145 additions and 6 deletions
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36
Architecture/amd64/cpu/InterruptDescriptorTable.cpp
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@ -1,5 +1,6 @@
#include "idt.hpp"
#include <memory.hpp>
#include <cpu.hpp>
#include <debug.h>
#include <io.h>
@ -98,8 +99,20 @@ namespace InterruptDescriptorTable
extern "C" void WarnSwapgs() { warn("swapgs"); }
// void *OriginalCR3;
extern "C" __attribute__((naked, used, no_stack_protector)) void InterruptHandlerStub()
{
// // Store cr3 to OriginalCR3
// asmv("mov %%cr3, %0"
// : "=q"(OriginalCR3)
// :
// : "memory");
// // Set cr3 to KPT (Kernel Page Table)
// asmv("mov %0, %%cr3"
// :
// : "q"(KPT)
// : "memory");
asm(
// "cmp $0x1000, %rsp\n"
// "jng .skip_swap_check__1\n"
@ -127,9 +140,28 @@ namespace InterruptDescriptorTable
"pushq %r15\n"
"movq %rsp, %rdi\n"
"call MainInterruptHandler\n"
"call MainInterruptHandler\n");
"popq %r15\n"
// // Check if the current cr3 is the same as the KPT
// // If not, then we need to restore the cr3
// asmv("pushq %rax\n" // push rax
// "pushq %rbx\n" // push rbx
// "movq %cr3, %rbx\n"); // mov cr3 to rbx
// asmv("movq %0, %%rax\n" // mov KPT to rax
// :
// : "q"(KPT)
// : "memory");
// asmv("cmpq %rax, %rbx\n" // compare cr3 to rax
// "jne .skip_restore_cr3\n"); // if not equal, skip restore cr3
// asmv("movq %0, %%cr3\n" // restore cr3
// :
// : "q"(OriginalCR3)
// : "memory");
// asm(".skip_restore_cr3:\n" // skip restore cr3 label
// "popq %rax\n" // KPT
// "popq %rbx\n"); // cr3
asm("popq %r15\n"
"popq %r14\n"
"popq %r13\n"
"popq %r12\n"