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#include <def.h>
u32 strlen(const char *s)
{
const char *ss = s;
while (*ss)
ss++;
return ss - s;
}
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;
}
void insl(u16 port, void *addr, int n)
{
__asm__ volatile("cld; rep insl"
: "=D"(addr), "=c"(n)
: "d"(port), "0"(addr), "1"(n)
: "memory", "cc");
}
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));
}
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);
}
int is_transmit_empty()
{
return inb(0x3f8 + 5) & 0x20;
}
void serial_put(char ch)
{
while (is_transmit_empty() == 0)
;
outb(0x3f8, (u8)ch);
}
void serial_print(const char *data)
{
for (u32 i = 0; i < strlen(data); i++)
serial_put(data[i]);
}
void main()
{
serial_install();
serial_print("Follow the white rabbit.");
}
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