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#include <stdint.h>
#include <system.h>
u8 inb(u16 port)
{
u8 value;
asm volatile("inb %1, %0" : "=a"(value) : "Nd"(port));
return value;
}
u16 inw(u16 port)
{
u16 value;
asm volatile("inw %1, %0" : "=a"(value) : "Nd"(port));
return value;
}
u32 inl(u16 port)
{
u32 value;
asm volatile("inl %1, %0" : "=a"(value) : "Nd"(port));
return value;
}
u32 cpu_flags()
{
u32 flags;
asm volatile("pushf\n"
"pop %0\n"
: "=rm"(flags)::"memory");
return flags;
}
int interrupts_enabled()
{
return (cpu_flags() & 0x200) == 0x200;
}
void interrupts_print()
{
if (interrupts_enabled())
log(GRN "Interrupts are enabled!" RES);
else
log(RED "Interrupts are disabled!" RES);
}
void cli()
{
asm volatile("cli");
}
void sti()
{
asm volatile("sti");
}
void hlt()
{
asm volatile("hlt");
}
void outb(u16 port, u8 data)
{
asm volatile("outb %0, %1" ::"a"(data), "Nd"(port));
}
void outw(u16 port, u16 data)
{
asm volatile("outw %0, %1" ::"a"(data), "Nd"(port));
}
void outl(u16 port, u32 data)
{
asm volatile("outl %0, %1" ::"a"(data), "Nd"(port));
}
u32 cr3_get()
{
u32 cr3;
asm volatile("movl %%cr3, %%eax" : "=a"(cr3));
return cr3;
}
void cr3_set(u32 cr3)
{
asm volatile("movl %%eax, %%cr3" ::"a"(cr3));
}
u32 cr0_get()
{
u32 cr0;
asm volatile("movl %%cr0, %%eax" : "=a"(cr0));
return cr0;
}
void cr0_set(u32 cr0)
{
asm volatile("movl %%eax, %%cr0" ::"a"(cr0));
}
void invlpg(u32 addr)
{
asm volatile("invlpg (%0)" ::"r"(addr) : "memory");
}
void serial_install()
{
outb(0x3f8 + 1, 0x00);
outb(0x3f8 + 3, 0x80);
outb(0x3f8 + 0, 0x03);
outb(0x3f8 + 1, 0x00);
outb(0x3f8 + 3, 0x03);
outb(0x3f8 + 2, 0xC7);
outb(0x3f8 + 4, 0x0B);
info("Installed serial connection");
}
int is_transmit_empty()
{
return inb(0x3f8 + 5) & 0x20;
}
void serial_put(char ch)
{
while (is_transmit_empty() == 0)
;
outb(0x3f8, (u8)ch);
}
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