#ifndef __SOS_H
#define __SOS_H

#ifdef __cplusplus
extern "C" {
#endif

#define KERNEL_MASK 0xfff
#define CAPTYPE_MASK 0xe00
#define REQUEST_MASK (KERNEL_MASK & ~CAPTYPE_MASK)
#define CAPTYPE_ADMIN 0x000
#define CAPTYPE_RECEIVER 0x200
#define CAPTYPE_MEMORY 0x400
#define CAPTYPE_THREAD 0x600
#define CAPTYPE_PAGE 0x800
#define CAPTYPE_CAPABILITY 0xa00
#define CAPTYPE_CAPPAGE 0xc00
/*#define CAPTYPE_??? 0xe00*/

/* This works on all kernel capabilities.  */
#define CAP_DEGRADE 0

/* Operations */
#define CAP_ADMIN_SCHEDULE 1
/* TODO: add priviledged operations.  */

#define CAP_RECEIVER_SET_OWNER 1
#define CAP_RECEIVER_CREATE_CAPABILITY 2
#define CAP_RECEIVER_CREATE_CALL_CAPABILITY 3
/* Not an operation; a capability with this bit set is a call capability.  */
#define CAP_RECEIVER_CALL 4

#define CAP_MEMORY_CREATE 1
#define CAP_MEMORY_DESTROY 2
#define CAP_MEMORY_LIST 3
#define CAP_MEMORY_MAPPING 4
#define CAP_MEMORY_SET_LIMIT 5
#define CAP_MEMORY_GET_LIMIT 6
#define CAP_MEMORY_DROP 7

#define CAP_THREAD_RUN 1
#define CAP_THREAD_GET_INFO 2	/* Details of this are arch-specific.  */
#define CAP_THREAD_SET_INFO 3	/* Details of this are arch-specific.  */
/* Flag values for processor state */
#define THREAD_FLAG_WAITING 0x80000000
#define THREAD_FLAG_RUNNING 0x40000000

#define CAP_PAGE_MAP 1
#define CAP_PAGE_SHARE 2
#define CAP_PAGE_SHARE_COW 3
#define CAP_PAGE_FORGET 4
// Not an operation; a capability without this bit cannot write to the page.  */
#define CAP_PAGE_WRITE 5

#define CAP_CAPABILITY_GET 1
#define CAP_CAPABILITY_SET_DEATH_NOTIFY 2

#define CAPPAGE_SIZE 102
/* Cappage has page's operations as well.  */
#define CAP_CAPPAGE_SET 6

#ifndef __KERNEL
typedef unsigned __Capability;

extern __Capability __my_receiver;
extern __Capability __my_admin;
extern __Capability __my_memory;
extern __Capability __my_call;

__Capability __cap_copy (__Capability src)
{
	return src | 2;
}

typedef struct __Message
{
	unsigned data[4];
	__Capability cap[4];
} __Message;

static int __invoke (__Capability target, __Message *msg)
{
	register int ret __asm__ ("v0");
	register unsigned v0 __asm__ ("v0") = target;
	register unsigned a0 __asm__ ("a0") = msg->cap[0];
	register unsigned a1 __asm__ ("a1") = msg->cap[1];
	register unsigned a2 __asm__ ("a2") = msg->cap[2];
	register unsigned a3 __asm__ ("a3") = msg->cap[3];
	register unsigned t0 __asm__ ("t0") = msg->data[0];
	register unsigned t1 __asm__ ("t1") = msg->data[1];
	register unsigned t2 __asm__ ("t2") = msg->data[2];
	register unsigned t3 __asm__ ("t3") = msg->data[3];
	__asm__ volatile ("syscall" : "+r" (v0), "=r" (a0), "=r" (a1), "=r" (a2), "=r" (a3), "=r" (t0), "=r" (t1), "=r" (t2), "=r" (t3));
	return ret;
}

static int __call (__Capability target, __Message *msg)
{
	register int ret __asm__ ("v0");
	register unsigned v0 __asm__ ("v0") = target;
	register unsigned a0 __asm__ ("a0") = msg->cap[0];
	register unsigned a1 __asm__ ("a1") = msg->cap[1];
	register unsigned a2 __asm__ ("a2") = msg->cap[2];
	register unsigned a3 __asm__ ("a3") = msg->cap[3];
	register unsigned t0 __asm__ ("t0") = msg->data[0];
	register unsigned t1 __asm__ ("t1") = msg->data[1];
	register unsigned t2 __asm__ ("t2") = msg->data[2];
	register unsigned t3 __asm__ ("t3") = msg->data[3];
	__asm__ volatile ("syscall" : "+r" (v0), "+r" (a0), "+r" (a1), "+r" (a2), "+r" (a3), "+r" (t0), "+r" (t1), "+r" (t2), "+r" (t3));
	msg->cap[0] = a0;
	msg->cap[1] = a1;
	msg->cap[2] = a2;
	msg->cap[3] = a3;
	msg->data[0] = t0;
	msg->data[1] = t1;
	msg->data[2] = t2;
	msg->data[3] = t3;
	return ret;
}

static int __invoke_01 (__Capability t, unsigned d)
{
	__Message msg;
	int ret;
	msg.data[0] = d;
	return __invoke (t, &msg);
}

static int __invoke_02 (__Capability t, unsigned d0, unsigned d1)
{
	__Message msg;
	int ret;
	msg.data[0] = d0;
	msg.data[1] = d1;
	return __invoke (t, &msg);
}

static int __invoke_11 (__Capability t, __Capability c, unsigned d)
{
	__Message msg;
	int ret;
	msg.cap[0] = c;
	msg.data[0] = d;
	return __invoke (t, &msg);
}

static int __invoke_12 (__Capability t, __Capability c, unsigned d0, unsigned d1)
{
	__Message msg;
	int ret;
	msg.cap[0] = c;
	msg.data[0] = d0;
	msg.data[1] = d1;
	return __invoke (t, &msg);
}

static __Capability __call_c01 (__Capability c, unsigned d)
{
	__Message msg;
	int ret;
	msg.cap[0] = c;
	msg.data[0] = d;
	ret = __call (__my_call, &msg);
	return ret ? msg.cap[0] : 0;
}

static __Capability __call_c02 (__Capability c, unsigned d0, unsigned d1)
{
	__Message msg;
	int ret;
	msg.cap[0] = c;
	msg.data[0] = d0;
	msg.data[1] = d1;
	ret = __call (__my_call, &msg);
	return ret ? msg.cap[0] : 0;
}

static __Capability __degrade (__Capability src, unsigned mask)
{
	return __call_c02 (src, CAP_DEGRADE, mask);
}

static void __schedule ()
{
	__invoke_01 (__my_admin, CAP_ADMIN_SCHEDULE);
}

static int __receiver_set_owner (__Capability receiver, __Capability owner)
{
	return __invoke_11 (receiver, owner, CAP_RECEIVER_SET_OWNER);
}

static __Capability __receiver_create_capability (__Capability receiver, unsigned protected_data)
{
	return __call_c02 (receiver, CAP_RECEIVER_CREATE_CAPABILITY, protected_data);
}

static __Capability __receiver_create_call_capability (__Capability receiver, unsigned protected_data)
{
	return __call_c02 (receiver, CAP_RECEIVER_CREATE_CALL_CAPABILITY, protected_data);
}

static __Capability __memory_create (__Capability memory, unsigned type)
{
	return __call_c02 (memory, CAP_MEMORY_CREATE, type);
}

static __Capability __memory_create_page (__Capability memory)
{
	return __memory_create (memory, CAPTYPE_PAGE);
}

static __Capability __memory_create_thread (__Capability memory)
{
	return __memory_create (memory, CAPTYPE_THREAD);
}

static __Capability __memory_create_receiver (__Capability memory)
{
	return __memory_create (memory, CAPTYPE_RECEIVER);
}

static __Capability __memory_create_memory (__Capability memory)
{
	return __memory_create (memory, CAPTYPE_MEMORY);
}

static __Capability __memory_create_cappage (__Capability memory)
{
	return __memory_create (memory, CAPTYPE_CAPPAGE);
}

static int __memory_destroy (__Capability memory, __Capability target)
{
	return __invoke_11 (memory, target, CAP_MEMORY_DESTROY);
}

/* TODO: #define CAP_MEMORY_LIST 3 */

static __Capability __memory_mapping (__Capability memory, unsigned address)
{
	return __call_c02 (memory, CAP_MEMORY_MAPPING, address);
}

static void __drop (__Capability cap)
{
	__invoke_11 (__my_memory, cap, CAP_MEMORY_DROP);
}

static int __thread_run (__Capability thread, int run)
{
	return __invoke_02 (thread, CAP_THREAD_RUN, run);
}

/* TODO: 
#define CAP_THREAD_GET_INFO 4
#define CAP_THREAD_SET_INFO 5
*/

/* TODO: all except map should also work for cappages.
#define CAP_PAGE_MAP 1
#define CAP_PAGE_SHARE 2
#define CAP_PAGE_SHARE_COW 3
#define CAP_PAGE_FORGET 4
*/

static __Capability __capability_get (__Capability cap)
{
	return __call_c01 (cap, CAP_CAPABILITY_GET);
}

static int __capability_set_death_notify (__Capability source, __Capability target)
{
	return __invoke_11 (source, target, CAP_CAPABILITY_SET_DEATH_NOTIFY);
}

static int __capability_cappage_set (__Capability page, __Capability cap, unsigned index)
{
	return __invoke_12 (page, cap, CAP_CAPPAGE_SET, index);
}

#endif

#ifdef __cplusplus
}
#endif

#endif