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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Types.h>
#include <Kernel/Arch/x86/ASM_wrapper.h>
#include <Kernel/Sections.h>
namespace Kernel {
UNMAP_AFTER_INIT void write_cr0(FlatPtr value)
{
asm volatile("mov %%rax, %%cr0" ::"a"(value));
}
UNMAP_AFTER_INIT void write_cr4(FlatPtr value)
{
asm volatile("mov %%rax, %%cr4" ::"a"(value));
}
FlatPtr read_cr0()
{
FlatPtr cr0;
asm("mov %%cr0, %%rax"
: "=a"(cr0));
return cr0;
}
FlatPtr read_cr2()
{
FlatPtr cr2;
asm("mov %%cr2, %%rax"
: "=a"(cr2));
return cr2;
}
FlatPtr read_cr3()
{
FlatPtr cr3;
asm("mov %%cr3, %%rax"
: "=a"(cr3));
return cr3;
}
void write_cr3(FlatPtr cr3)
{
// NOTE: If you're here from a GPF crash, it's very likely that a PDPT entry is incorrect, not this!
asm volatile("mov %%rax, %%cr3" ::"a"(cr3)
: "memory");
}
FlatPtr read_cr4()
{
FlatPtr cr4;
asm("mov %%cr4, %%rax"
: "=a"(cr4));
return cr4;
}
#define DEFINE_DEBUG_REGISTER(index) \
FlatPtr read_dr##index() \
{ \
FlatPtr value; \
asm("mov %%dr" #index ", %%rax" \
: "=a"(value)); \
return value; \
} \
void write_dr##index(FlatPtr value) \
{ \
asm volatile("mov %%rax, %%dr" #index ::"a"(value)); \
}
DEFINE_DEBUG_REGISTER(0);
DEFINE_DEBUG_REGISTER(1);
DEFINE_DEBUG_REGISTER(2);
DEFINE_DEBUG_REGISTER(3);
DEFINE_DEBUG_REGISTER(6);
DEFINE_DEBUG_REGISTER(7);
}
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