src/init/main.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

#include <kernel/syscalls.h>
#include <stdint.h>

// takes a cstring and copies it right before a page boundary
const char *multipageify(const char *str) {
	static char buf[0x2000] __attribute__((section("text")));

	char *out = ((uintptr_t)buf & ~0xFFF) + 0xFFF;
	char *cur = out;
	do {
		*cur++ = *str;
	} while (*str++ != '\0');
	return out;
}

int main() {
	// try to print a string crossing page boundaries
	_syscall_debuglog(
		multipageify("I cross pages. "),
		      sizeof("I cross pages. ") - 1);

	_syscall_fork();

	_syscall_debuglog("fork ",
	           sizeof("fork ") - 1);

	_syscall_exit("bye from init! ",
	       sizeof("bye from init! ") - 1);
}