me.c

pmpmodavc102_sub_src,psp下很好的播放器源码

/*
PMP Mod
Copyright (C) 2006 jonny

Homepage: http://jonny.leffe.dnsalias.com
E-mail:   [e-mail]

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
simple lib to use the psp me

a lot of code is taken from here: http://forums.ps2dev.org/viewtopic.php?t=2652
thanks to crazyc, mrbrown, Brunni, xdeadbeef and anyone else involved
(major optimizations in libavcodec are done with the me)
*/


#include <pspkernel.h>
#include <string.h>
#include "me.h"
#include "mem64.h"


struct me_struct
	{
	int start;
	int end;
	void (*func)(int);
	int param;
	int signaled;
	};


volatile struct me_struct *nocache;


void me_stub(void);
void me_stub_end(void);


void me_startproc(u32 func, u32 param)
	{
	memcpy((void *) 0xbfc00040, me_stub, (int) (me_stub_end - me_stub));

	_sw(func,  0xbfc00600);
	_sw(param, 0xbfc00604);

	sceKernelDcacheWritebackAll();
	sceSysregMeResetEnable();
	sceSysregMeBusClockEnable();
	sceSysregMeResetDisable();
	}


void me_function(int unused)
	{
	while (1)
		{
		while (nocache->start == 0);
		nocache->start = 0;
		nocache->func(nocache->param);
		nocache->end = 1;
		}
	}


int me_struct_init()
	{
	nocache = malloc_64(sizeof(struct me_struct));

	if (nocache == 0) return(0);

	nocache = (volatile struct me_struct *) (((int) nocache) | 0x40000000);
	sceKernelDcacheWritebackInvalidateAll();

	nocache->start    = 0;
	nocache->end      = 1;
	nocache->func     = 0;
	nocache->param    = 0;
	nocache->signaled = 0;

	me_startproc((u32) me_function, 0);

	return(1);
	}


void me_start(int func, int param)
	{
	nocache->end   = 0;
	nocache->func  = (void (*)(int)) func;
	nocache->param = param;
	nocache->start = 1;
	}


void me_wait()
	{
	while (nocache->end == 0);
	}


int me_unused()
	{
	return(nocache->end);
	}


void me_signal_reset()
	{
	nocache->signaled = 0;
	}


void me_signal()
	{
	nocache->signaled = 1;
	}


int me_signaled()
	{
	return(nocache->signaled);
	}


void me_sceKernelDcacheWritebackInvalidateAll()
	{
	asm __volatile__
		(
		"cache 20, 0($0)\n"
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		);
	}