#include <tce/syscall.h>
#include <stdlib.h>
#include <sched.h>
#include <tce/vfs.h>

static size_t call(size_t a, size_t b, size_t c, size_t d, size_t e, size_t f) {
	size_t ret;
	asm volatile("int $64" : "=a"(ret) : "a"(a), "b"(b), "c"(c), "d"(d), "S"(e), "D"(f));
	return ret;
}

void thread_exit() {
	call(SC_THREAD_EXIT, 0, 0, 0, 0, 0);
}

void schedule() {
	call(SC_SCHEDULE, 0, 0,0, 0, 0);
}

void thread_sleep(int time) {
	call(SC_THREAD_SLEEP, time, 0, 0, 0, 0);
}

void process_exit(int retval) {
	call(SC_PROCESS_EXIT, retval, 0, 0, 0, 0);
}

void printk(const char* str) {
	call(SC_PRINTK, (unsigned)str, 0, 0, 0, 0);
}

//THREAD CREATION
struct thread_start_data {
	void (*entry)(void*);
	void *data;
	void *stack;
};
void *_stack_to_free = 0;
uint32_t _stack_freeing_mutex = MUTEX_UNLOCKED;

void thread_start(void *data) {
	struct thread_start_data *tsd = data;
	tsd->entry(tsd->data);
	mutex_lock(&_stack_freeing_mutex);
	if (_stack_to_free != 0) free(_stack_to_free);
	_stack_to_free = tsd->stack;
	asm volatile("movl %%ebx, (_stack_freeing_mutex); int $64;" ::
		"a"(SC_THREAD_EXIT), "b"(MUTEX_UNLOCKED));
}
void thread_new(void (*entry)(void*), void *data) {
	struct thread_start_data *tsd = malloc(sizeof(struct thread_start_data));
	tsd->entry = entry;
	tsd->data = data;
	tsd->stack = malloc(NEW_STACK_SIZE);
	call(SC_THREAD_NEW, (unsigned)thread_start, (unsigned)tsd, (unsigned)(tsd->stack + NEW_STACK_SIZE), 0, 0);
}

void irq_wait(int number) {
	call(SC_IRQ_WAIT, number, 0, 0, 0, 0);
}

int proc_priv() {
	return call(SC_PROC_PRIV, 0, 0, 0, 0, 0);
}

// ******** memory

void* sbrk(ptrdiff_t s) {
	return (void*)call(SC_SBRK, s, 0, 0, 0, 0);
}

void brk(void* ptr) {
	call (SC_BRK, (size_t)ptr, 0, 0, 0, 0);
}

// ********** proc

int run(const char* filename, const char** args, FILE zero_fd) {
	return call(SC_RUN, (unsigned)filename, (unsigned)args, (unsigned)zero_fd, 0, 0);
}

int waitpid(int p, int block) {
	return call(SC_WAITPID, p, block, 0, 0, 0);
}

// ********** file

FILE open(const char* filename, int mode) {
	return call(SC_OPEN, (unsigned)filename, mode, 0, 0, 0);
}

FILE open_relative(FILE root, const char* filename, int mode) {
	return call(SC_OPEN_RELATIVE, root, (unsigned) filename, mode, 0, 0);
}

int stat(const char* filename, file_info *info) {
	return call(SC_STAT, (unsigned) filename, (unsigned) info, 0, 0, 0);
}

int stat_relative(FILE root, const char* filename, file_info *info) {
	return call(SC_STAT_RELATIVE, root, (unsigned) filename, (unsigned) info, 0, 0);
}

int statf(FILE file, file_info *info) {
	return call(SC_STATF, file, (unsigned)info, 0, 0, 0);
}

void close(FILE file) {
	call(SC_CLOSE, file, 0, 0, 0, 0);
}

int read(FILE file, size_t offset, size_t len, char *buffer) {
	return call(SC_READ, file, offset, len, (unsigned) buffer, 0);
}

int write(FILE file, size_t offset, size_t len, const char* buffer) {
	return call(SC_WRITE, file, offset, len, (unsigned) buffer, 0);
}

int link(const char* from, const char* to, int mode) {
	return call(SC_LINK, (unsigned) from, (unsigned)to, mode, 0, 0);
}