#ifndef _LIBMSL_M_SYSTEM_H
#define _LIBMSL_M_SYSTEM_H

#include <desc.h>
#include <dir_entry.h>
#include <stddef.h>
#include <stdint.h>

#if defined(__x86_64__)
#define PAGE_SIZE 4096
#endif

#define MAP_PRESENT (1 << 0)
#define MAP_RW      (1 << 1)
#define MAP_USER    (1 << 2)
#define MAP_FLAGS   (MAP_PRESENT | MAP_USER)

/* Quit the current running process */
int quit (void);

/* Test syscall */
int test (char c);

/* Give the CPU to another process */
int sched (void);

/* map memory into this procgrou[ */
void* map (uintptr_t vaddr, size_t pages, uint32_t flags);

/* unmap memory from this procgrou[ */
int unmap (uintptr_t vaddr, size_t pages);

/* Clone process with argument and entry point */
int clone (uintptr_t vstack_top, void (*entry) (void), void* argument_ptr);

/* Create a mutex */
int mutex_create (void);

/* Delete a mutex. Will wake up waiters */
int mutex_delete (int mutex_rid);

/* Lock a mutex */
int mutex_lock (int mutex_rid);

/* Unlock a mutex */
int mutex_unlock (int mutex_rid);

/* get current process argument pointer */
void* argument_ptr (void);

/* Call a device command */
int device_do (const char* device_key, int cmd, void* a1, void* a2, void* a3, void* a4);

/* Run external ELF program */
int exec (const char* volume, const char* path);

/* Open a file */
int volume_open (const char* volume);

/* Close a file */
int volume_close (void);

/* Read a file */
int read_file (const char* path, size_t off, uint8_t* buffer, size_t size);

/* describe a file */
int describe (const char* path, struct desc* desc);

/* send a message to a procgroup's mail */
int mail_send (int pgid, void* mesg, size_t mesg_size);

/* receive a message from mail */
int mail_receive (void* mesg, size_t mesg_size);

/* get procgroup id of a perticular process */
int get_procgroup (int pid);

/* get PID of process, which exec'ed the current process */
int get_exec_pid (void);

/* Read directory entry */
int read_dir_entry (const char* path, struct dir_entry* entry, size_t entry_num);

/* create a file */
int create_file (const char* path);

/* write to a file */
int write_file (const char* path, size_t off, uint8_t* buffer, size_t size);

/* wait for process */
int wait_for_pid (int pid);

/* Kill process */
int kill (int pid);

#endif // _LIBMSL_M_SYSTEM_H