util.h

#pragma once

#define _inline inline __attribute__((always_inline))

static _inline unsigned short inports(unsigned short _port) {
	unsigned short rv;
	asm volatile ("inw %1, %0" : "=a" (rv) : "dN" (_port));
	return rv;
}

static _inline void outports(unsigned short _port, unsigned short _data) {
	asm volatile ("outw %1, %0" : : "dN" (_port), "a" (_data));
}

static _inline unsigned int inportl(unsigned short _port) {
	unsigned int rv;
	asm volatile ("inl %%dx, %%eax" : "=a" (rv) : "dN" (_port));
	return rv;
}

static _inline void outportl(unsigned short _port, unsigned int _data) {
	asm volatile ("outl %%eax, %%dx" : : "dN" (_port), "a" (_data));
}

static _inline unsigned char inportb(unsigned short _port) {
	unsigned char rv;
	asm volatile ("inb %1, %0" : "=a" (rv) : "dN" (_port));
	return rv;
}

static _inline void outportb(unsigned short _port, unsigned char _data) {
	asm volatile ("outb %1, %0" : : "dN" (_port), "a" (_data));
}


static _inline void inportsm(unsigned short port, unsigned char * data, unsigned long size) {
	asm volatile ("rep insw" : "+D" (data), "+c" (size) : "d" (port) : "memory");
}

static _inline void * memcpy(void * restrict dest, const void * restrict src, long n) {
	asm volatile("cld; rep movsb"
	            : "=c"((int){0})
	            : "D"(dest), "S"(src), "c"(n)
	            : "flags", "memory");
	return dest;
}

static _inline void * memset(void * dest, int c, long n) {
	asm volatile("cld; rep stosb"
	             : "=c"((int){0})
	             : "D"(dest), "a"(c), "c"(n)
	             : "flags", "memory");
	return dest;
}

static int strcmp(const char * l, const char * r) {
	for (; *l == *r && *l; l++, r++);
	return *(unsigned char *)l - *(unsigned char *)r;
}

static char * strchr(const char * s, int c) {
	while (*s) {
		if (*s == c) {
			return (char *)s;
		}
		s++;
	}
	return 0;
}