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#define FOOLOS_MODULE_NAME "x86"
#include "x86.h"
#include "lib/int/stdint.h"
#include "lib/logger/log.h"
extern volatile uint64_t task_system_clock; // from task.c
void sleep(int i)
{
volatile uint64_t clock=task_system_clock;
// while(clock+i>task_system_clock)
// {
// log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"It is %d but I will sleep until %d...",task_system_clock,clock+i);
for(int j=0;j<i;j++)asm("hlt");
// }
}
// disable interrupts
void x86_int_disable()
{
__asm__("cli");
}
// enable interrupts
void x86_int_enable()
{
__asm__("sti");
}
// 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;
}
void x86_mov(uint8_t val)
{
}
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");
}
//xchg
volatile uint8_t x86_xchg(volatile uint8_t *addr, uint8_t val)
{
uint8_t result;
// test. because asm does not work !?
uint8_t oldval=*addr;
*addr=val;
return oldval;
// The + in "+m" denotes a read-modify-write operand.
asm volatile("lock xchg %0, %1" :
"+m" (*addr), "=a" (result) :
"1" (val) :
"cc");
//log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"xchg val:%d with addr:0x%08X : result: %d",val,addr,result);
//
return result;
}
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