/**

  * $Id: pvr2mem.c,v 1.2 2007-01-15 10:10:51 nkeynes Exp $

  *

  * PVR2 (Video) VRAM handling routines (mainly for the 64-bit region)

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * 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.

  */

 #include "pvr2.h"

 extern char *video_base;

 void pvr2_vram64_write( sh4addr_t destaddr, char *src, uint32_t length )

 {

     int bank_flag = (destaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwsrc;

     int i;

     destaddr = destaddr & 0x7FFFFF;

     if( destaddr + length > 0x800000 ) {

 	length = 0x800000 - destaddr;

     }

     for( i=destaddr & 0xFFFFF000; i < destaddr + length; i+= PAGE_SIZE ) {

 	texcache_invalidate_page( i );

     }

     banks[0] = ((uint32_t *)(video_base + ((destaddr & 0x007FFFF8) >>1)));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag ) 

 	banks[0]++;

     /* Handle non-aligned start of source */

     if( destaddr & 0x03 ) {

 	char *dest = ((char *)banks[bank_flag]) + (destaddr & 0x03);

 	for( i= destaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

 	    *dest++ = *src++;

 	}

 	bank_flag = !bank_flag;

     }

     dwsrc = (uint32_t *)src;

     while( length >= 4 ) {

 	*banks[bank_flag]++ = *dwsrc++;

 	bank_flag = !bank_flag;

 	length -= 4;

     }

     /* Handle non-aligned end of source */

     if( length ) {

 	src = (char *)dwsrc;

 	char *dest = (char *)banks[bank_flag];

 	while( length-- > 0 ) {

 	    *dest++ = *src++;

 	}

     }  

 }

 /**

  * Write an image to 64-bit vram, with a line-stride different from the line-size.

  * The destaddr must be 32-bit aligned, and both line_bytes and line_stride_bytes

  * must be multiples of 4.

  */

 void pvr2_vram64_write_stride( sh4addr_t destaddr, char *src, uint32_t line_bytes, 

 			       uint32_t line_stride_bytes, uint32_t line_count )

 {

     int bank_flag = (destaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwsrc;

     uint32_t line_gap;

     int line_gap_flag;

     int i,j;

     destaddr = destaddr & 0x7FFFF8;

     i = line_stride_bytes - line_bytes;

     line_gap_flag = i & 0x04;

     line_gap = i >> 3;

     line_bytes >>= 2;

     for( i=destaddr & 0xFFFFF000; i < destaddr + line_stride_bytes*line_count; i+= PAGE_SIZE ) {

 	texcache_invalidate_page( i );

     }

     banks[0] = (uint32_t *)(video_base + (destaddr >>1));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag ) 

 	banks[0]++;

     dwsrc = (uint32_t *)src;

     for( i=0; i<line_count; i++ ) {

 	for( j=0; j<line_bytes; j++ ) {

 	    *banks[bank_flag]++ = *dwsrc++;

 	    bank_flag = !bank_flag;

 	}

 	banks[0] += line_gap;

 	banks[1] += line_gap;

 	if( line_gap_flag ) {

 	    banks[bank_flag]++;

 	    bank_flag = !bank_flag;

 	}

     }    

 }

 /**

  * Read an image from 64-bit vram, with a destination line-stride different from the line-size.

  * The srcaddr must be 32-bit aligned, and both line_bytes and line_stride_bytes

  * must be multiples of 4. line_stride_bytes must be >= line_bytes.

  * This method is used to extract a "stride" texture from vram.

  */

 void pvr2_vram64_read_stride( char *dest, uint32_t dest_line_bytes, sh4addr_t srcaddr,

 				   uint32_t src_line_bytes, uint32_t line_count )

 {

     int bank_flag = (srcaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwdest;

     uint32_t dest_line_gap;

     uint32_t src_line_gap;

     uint32_t line_bytes;

     int src_line_gap_flag;

     int i,j;

     srcaddr = srcaddr & 0x7FFFF8;

     if( src_line_bytes <= dest_line_bytes ) {

 	dest_line_gap = (dest_line_bytes - src_line_bytes) >> 2;

 	src_line_gap = 0;

 	src_line_gap_flag = 0;

 	line_bytes = src_line_bytes >> 2;

     } else {

 	i = (src_line_bytes - dest_line_bytes);

 	src_line_gap_flag = i & 0x04;

 	src_line_gap = i >> 3;

 	line_bytes = dest_line_bytes >> 2;

     }

     banks[0] = (uint32_t *)(video_base + (srcaddr>>1));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag )

 	banks[0]++;

     dwdest = (uint32_t *)dest;

     for( i=0; i<line_count; i++ ) {

 	for( j=0; j<line_bytes; j++ ) {

 	    *dwdest++ = *banks[bank_flag]++;

 	    bank_flag = !bank_flag;

 	}

 	dwdest += dest_line_gap;

 	banks[0] += src_line_gap;

 	banks[1] += src_line_gap;

 	if( src_line_gap_flag ) {

 	    banks[bank_flag]++;

 	    bank_flag = !bank_flag;

 	}

     }

 }

 void pvr2_vram_write_invert( sh4addr_t destaddr, char *src, uint32_t length, uint32_t line_length )

 {

     char *dest = video_base + (destaddr & 0x007FFFFF);

     char *p = src + length - line_length;

     while( p >= src ) {

 	memcpy( dest, p, line_length );

 	p -= line_length;

 	dest += line_length;

     }

 }

 void pvr2_vram64_read( char *dest, sh4addr_t srcaddr, uint32_t length )

 {

     int bank_flag = (srcaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwdest;

     int i;

     srcaddr = srcaddr & 0x7FFFFF;

     if( srcaddr + length > 0x800000 )

 	length = 0x800000 - srcaddr;

     banks[0] = ((uint32_t *)(video_base + ((srcaddr&0x007FFFF8)>>1)));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag )

 	banks[0]++;

     /* Handle non-aligned start of source */

     if( srcaddr & 0x03 ) {

 	char *src = ((char *)banks[bank_flag]) + (srcaddr & 0x03);

 	for( i= srcaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

 	    *dest++ = *src++;

 	}

 	bank_flag = !bank_flag;

     }

     dwdest = (uint32_t *)dest;

     while( length >= 4 ) {

 	*dwdest++ = *banks[bank_flag]++;

 	bank_flag = !bank_flag;

 	length -= 4;

     }

     /* Handle non-aligned end of source */

     if( length ) {

 	dest = (char *)dwdest;

 	char *src = (char *)banks[bank_flag];

 	while( length-- > 0 ) {

 	    *dest++ = *src++;

 	}

     }

 }

 void pvr2_vram64_dump( sh4addr_t addr, uint32_t length, FILE *f ) 

 {

     char tmp[length];

     pvr2_vram64_read( tmp, addr, length );

     fwrite_dump( tmp, length, f );

 }