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#include "x86.h"
// get control registers (cr0-cr4)
uint32_t x86_get_cr0()
{
uint32_t cr;
asm volatile("mov %%cr0, %0": "=b"(cr));
return cr;
}
uint32_t x86_get_cr1()
{
uint32_t cr=0;
// reading the reserved cr1 register results in crash.
// (at least on emulators)
// asm volatile("mov %%cr1, %0": "=b"(cr));
return cr;
}
uint32_t x86_get_cr2()
{
uint32_t cr;
asm volatile("mov %%cr2, %0": "=b"(cr));
return cr;
}
uint32_t x86_get_cr3()
{
uint32_t cr=0;
asm volatile("mov %%cr3, %0": "=b"(cr));
return cr;
}
uint32_t x86_get_cr4()
{
uint32_t cr;
asm volatile("mov %%cr4, %0": "=b"(cr));
return cr;
}
void x86_outb(int port, uint8_t data)
{
__asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
}
uint8_t x86_inb(int port)
{
uint8_t data;
__asm __volatile("inb %w1,%0" : "=a" (data) : "d" (port));
return data;
}
void x86_outw(int port, uint16_t data)
{
__asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
}
uint16_t x86_inw(int port)
{
uint16_t data;
__asm __volatile("inw %w1,%0" : "=a" (data) : "d" (port));
return data;
}
void x86_outl(int port, uint32_t data)
{
__asm __volatile("outl %0,%w1" : : "a" (data), "d" (port));
}
uint32_t x86_inl(int port)
{
uint32_t data;
__asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port));
return data;
}
void x86_set_pdbr(uint32_t addr)
{
asm volatile("mov %0, %%cr3":: "b"(addr));
}
// enable PT bit in CR0
void x86_paging_enable()
{
uint32_t cr0=x86_get_cr0();
cr0 |= 0x80000000; // enable paging
asm volatile("mov %0, %%cr0":: "b"(cr0));
}
// disable PT bit in CR0
void x86_paging_disable()
{
uint32_t cr0=x86_get_cr0();
cr0 &= ~0x80000000;
asm volatile("mov %0, %%cr0":: "b"(cr0));
}
void x86_flush_tlb(uint32_t addr)
{
asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
}
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