#include <os/scall.h>
#include <os/svcNums.h>
#include <os/fs.h>
#include <os/svc.h>
#include <os/heap.h>
#include <memStack.h>
/*
#include <stdio.h>
#include <string.h>
*/

MemStack *ms = NULL;

u64 svc_handler(u64 callCode, u64 a, u64 b, u64 c, u64 d)
{
	Psw psw;
	u64 registers[16];
	void* point;
	savecontext(&psw, registers);
	switch(callCode) {
		case SVC_EXIT:
			if(ms) msDestroyFN(ms, freeHeap); //dynamic memory was used, kill it
			setcontext(&shellPsw, shellRegisters);
			break;
		case SVC_PRINT: //print
			registers[2] = putline((char*)a, (u32)b);
			break;
		case SVC_READ:
			registers[2] = getline((char*)a, (u32)b);
			break;
		case SVC_FINFO:
			registers[2] = getFInfo(a, (void*) b);
			break;
		case SVC_GETHEAP:
			point = allocHeap(a, (void*)b);
			if(!ms) ms = msInit();
			msPush(ms, point);
			registers[2] = (u64)point;
			break;
		default:
			registers[2] = -1; //TODO HACK
			break;
	}
	setcontext(&psw, registers);
	return -1; //the code should never get here
}