bootsector_c/boot.c

#include "hedley.h"

HEDLEY_ALWAYS_INLINE void putchar(char);
HEDLEY_ALWAYS_INLINE void write(char*);

void _start(void) {
	__asm__ volatile (
		"movl $0x8000, %esp\n"
		"ljmp $(0),$(start)\n"
	"start:\n"
	);
	write("Hello World!\r\n\0");
	while(1)
		;
}

HEDLEY_ALWAYS_INLINE void write(char *out) {
	for (char *i = out; *i != 0; i++)
		putchar(*i);
}

HEDLEY_ALWAYS_INLINE void putchar(char out) {
__asm__ volatile (
	"movb $0x0e, %%ah;"
	"movb %0, %%al;"
	"int $0x10;"
	:
	:"r"(out)
	:"%ax"
);
}