/* SCEI CONFIDENTIAL
 "PlayStation 2" Programmer Tool Runtime Library Release 2.4
 */
/*
 *                      Emotion Engine Library
 *                          Version 1.10
 *                           Shift-JIS
 *
 *      Copyright (C) 1998-1999 Sony Computer Entertainment Inc.
 *                        All Rights Reserved.
 *
 *                       libkernel - crt0.s
 *                        kernel libraly
 *
 *       Version        Date            Design      Log
 *  --------------------------------------------------------------------
 *       1.10           Oct.12.1999     horikawa    renewal
 *       1.50           May.16.2000     horikawa
 */

/* Ken: Added so that I can use register names like a0 rather than $4	*/
#include "C:\usr\local\sce\iop\gcc\mipsel-scei-elfl\include\cpureg.h"

#define DS_SOUND

#ifdef __mips16
	.set nomips16	/* This file contains 32 bit assembly code. */
#endif

#define	ARG_SIZ     256 + 16*4 + 1*4

         _stack	=		_std_stack
         
	.set noat
    	.set noreorder
	.global ENTRYPOINT
	.global _start
	.ent	_start
	.text				# 0x00200000
	nop
	nop
ENTRYPOINT:
_start:
#if defined(DS_SOUND)
	/* $4 = 第 1 引数（レジスタ渡し）*/
   	lui	$2, %hi(_args_ptr)
   	addiu	$2, $2, %lo(_args_ptr)
    	sw	$4, ($2)
#endif
/*
 * clear .bss
 */
zerobss:
	lui	$2, %hi(_fbss)
	lui	$3, %hi(_end)
	addiu	$2, $2, %lo(_fbss)
	addiu	$3, $3, %lo(_end)
1:
	sq	$0, ($2)
	nop
	sltu	$1, $2, $3
	nop
	nop
	bne	$1, $0, 1b
	addiu	$2, $2, 16

/*
 * initialize main thread
 */
	lui	$4, %hi(_gp)
	lui	$5, %hi(_stack)
	lui	$6, %hi(_stack_size)
	lui	$7, %hi(_args)
	lui	$8, %hi(_root)
	addiu	$4, $4, %lo(_gp)
	addiu	$5, $5, %lo(_stack)
	addiu	$6, $6, %lo(_stack_size)
	addiu	$7, $7, %lo(_args)
	addiu	$8, $8, %lo(_root)
	move	$28, $4
	addiu	$3, $0, 60
	syscall
	move	$29, $2

/*
 * initialize heap area
 */
	lui	$4, %hi(_end)
	lui	$5, %hi(_heap_size)
	addiu	$4, $4, %lo(_end)
	addiu	$5, $5, %lo(_heap_size)
	addiu	$3, $0, 61
	syscall

/*
 *	Ken addition.
 *	Detect whether we are running on a ProView system by seeing whether 
 *	snputs works.
 */

	jal sceScfGetLanguage		# snputs will always fail until this is called, for some reason.
	nop
	
	la a0,TestStringForSnputs
	jal snputs
	nop

	bltz v0,notproview			# If the return value is -1, it is not a proview.
	nop

/*
 *	Now we know we're running on a ProView, so run the startup code copied from
 *	the ProView crt0.s
 */

	
/*
 * flush data cache
 */
	jal	FlushCache
	move	$4, $0

/*
 * call main program
 */
	ei

/*
 * This is a Neversoft addition, we need to call pre_main to set up the mem manager & debug stuff
 */ 
    jal pre_main
	nop
	
#if defined(DS_SOUND)	
 	lui	$2, %hi(_args_ptr)
 	addiu	$2, $2, %lo(_args_ptr)

 	lw	$3, ($2)
	
 	beq	$3, $0, _skipArgV
 	nop

 	addiu	$2, $3, 4
	b	_run	
	nop

_skipArgV:
	lui	$2, %hi(_args)
	addiu	$2, $2, %lo(_args)

#else
	lui	$2, %hi(_args)
	addiu	$2, $2, %lo(_args)
#endif

_run:

	lw	$4, ($2)
	jal	main
	addiu	$5, $2, 4

/*
 * This is a Neversoft addition, we call post_main at the end
 */ 
    jal post_main
	nop

#if defined(DS_SOUND)
	j	_root
	nop
#else
	j	Exit
	move	$4, $2
#endif

		
notproview:

/*
 * initialize System
 */
	jal	_InitSys
	nop

/*
 * flush data cache
 */
	jal	FlushCache
	move	$4, $0

/*
 * call main program
 */
	ei
			
/*
 * This is a Neversoft addition, we need to call pre_main to set up the mem manager & debug stuff
 */ 
    jal pre_main
	nop
        
	lui	$2, %hi(_args)
	addiu	$2, $2, %lo(_args)
	lw	$4, ($2)
	jal	main
	addiu	$5, $2, 4

/*
 * This is a Neversoft addition, we call post_main at the end
 */ 
    jal post_main
	nop
        
	j	Exit
	move	$4, $2
	.end	_start

/**************************************/
	.align	3
	.global	_exit
	.ent	_exit
_exit:
#if defined(DS_SOUND)
	j	_root
	nop
#else
	j	Exit			# Exit(0);
	move	$4, $0
#endif
	.end	_exit
    
	.align	3
	.ent	_root
_root:
#if defined(DS_SOUND)
/*
 *	K: If not ProView, don't do the next bit, or it will crash.
 */
	la a0,TestStringForSnputs
	jal snputs
	nop
	bltz v0,notproviewsogotoexitthread	# If the return value is -1, it is not a proview.
	nop

	lui	$2, %hi(_args_ptr)
	addiu	$2, $2, %lo(_args_ptr)
	lw	$3, ($2)
	jal	SignalSema
	lw	$4, ($3)
	
notproviewsogotoexitthread:	
#endif
	addiu	$3, $0, 35		# ExitThread();
	syscall
	.end	_root

	.bss
	.align	6
_args: .space	ARG_SIZ

#if defined(DS_SOUND)
	.data
_args_ptr:
	.space 4
#endif



/*
 * Ken: This is used by ProView detection code
 */
	.section	.rodata
TestStringForSnputs:   .string "crt0.s detected ProView ...\n"