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/* zxcf.c: ZXCF interface routines
Copyright (c) 2003-2008 Garry Lancaster and Philip Kendall
$Id: zxcf.c 4972 2013-05-19 16:46:43Z zubzero $
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: Philip Kendall <philip-fuse@shadowmagic.org.uk>
*/
#include <config.h>
#include <string.h>
#include <libspectrum.h>
#include "debugger/debugger.h"
#include "ide.h"
#include "machine.h"
#include "memory.h"
#include "module.h"
#include "periph.h"
#include "settings.h"
#include "ui/ui.h"
#include "unittests/unittests.h"
#include "zxcf.h"
/* A 16KB memory chunk accessible by the Z80 when /ROMCS is low */
static memory_page zxcf_memory_map_romcs[MEMORY_PAGES_IN_16K];
static int zxcf_memory_source;
/*
TBD: Allow memory size selection (128K/512K/1024K)
TBD: Add secondary channel
*/
/* Private function prototype */
static void set_zxcf_bank( int bank );
static libspectrum_byte zxcf_memctl_read( libspectrum_word port,
int *attached );
static void zxcf_memctl_write( libspectrum_word port, libspectrum_byte data );
static libspectrum_byte zxcf_ide_read( libspectrum_word port, int *attached );
static void zxcf_ide_write( libspectrum_word port, libspectrum_byte data );
static void zxcf_activate( void );
/* Data */
static const periph_port_t zxcf_ports[] = {
{ 0x10f4, 0x10b4, zxcf_memctl_read, zxcf_memctl_write },
{ 0x10f4, 0x00b4, zxcf_ide_read, zxcf_ide_write },
{ 0, 0, NULL, NULL }
};
static const periph_t zxcf_periph = {
&settings_current.zxcf_active,
zxcf_ports,
1,
zxcf_activate
};
static int zxcf_writeenable;
static libspectrum_ide_channel *zxcf_idechn;
#define ZXCF_PAGES 64
#define ZXCF_PAGE_LENGTH 0x4000
static libspectrum_byte *ZXCFMEM[ ZXCF_PAGES ];
static int memory_allocated = 0;
static libspectrum_byte last_memctl;
static void zxcf_reset( int hard_reset );
static void zxcf_memory_map( void );
static void zxcf_from_snapshot( libspectrum_snap *snap );
static void zxcf_to_snapshot( libspectrum_snap *snap );
static module_info_t zxcf_module_info = {
zxcf_reset,
zxcf_memory_map,
NULL,
zxcf_from_snapshot,
zxcf_to_snapshot,
};
/* Debugger events */
static const char *event_type_string = "zxcf";
static int page_event, unpage_event;
/* Housekeeping functions */
int
zxcf_init( void )
{
int error, i;
last_memctl = 0x00;
zxcf_idechn = libspectrum_ide_alloc( LIBSPECTRUM_IDE_DATA16 );
ui_menu_activate( UI_MENU_ITEM_MEDIA_IDE_ZXCF_EJECT, 0 );
if( settings_current.zxcf_pri_file ) {
error = libspectrum_ide_insert( zxcf_idechn, LIBSPECTRUM_IDE_MASTER,
settings_current.zxcf_pri_file );
if( error ) return error;
ui_menu_activate( UI_MENU_ITEM_MEDIA_IDE_ZXCF_EJECT, 1 );
}
module_register( &zxcf_module_info );
zxcf_memory_source = memory_source_register( "ZXCF" );
for( i = 0; i < MEMORY_PAGES_IN_16K; i++ )
zxcf_memory_map_romcs[i].source = zxcf_memory_source;
periph_register( PERIPH_TYPE_ZXCF, &zxcf_periph );
periph_register_paging_events( event_type_string, &page_event,
&unpage_event );
return 0;
}
int
zxcf_end( void )
{
return libspectrum_ide_free( zxcf_idechn );
}
static void
zxcf_reset( int hard_reset GCC_UNUSED )
{
if( !settings_current.zxcf_active ) return;
machine_current->ram.romcs = 1;
set_zxcf_bank( 0 );
zxcf_writeenable = 0;
machine_current->memory_map();
libspectrum_ide_reset( zxcf_idechn );
}
static int
zxcf_commit_wrapper( libspectrum_ide_unit unit )
{
if( unit != LIBSPECTRUM_IDE_MASTER ) {
ui_error( UI_ERROR_ERROR, "%s:%d: unit is %d, not LIBSPECTRUM_IDE_MASTER",
__FILE__, __LINE__, unit );
abort();
}
return zxcf_commit();
}
int
zxcf_insert( const char *filename )
{
return ide_insert( filename, zxcf_idechn, LIBSPECTRUM_IDE_MASTER,
zxcf_commit_wrapper, &settings_current.zxcf_pri_file,
UI_MENU_ITEM_MEDIA_IDE_ZXCF_EJECT );
}
int
zxcf_commit( void )
{
int error;
error = libspectrum_ide_commit( zxcf_idechn, LIBSPECTRUM_IDE_MASTER );
return error;
}
int
zxcf_eject( void )
{
return ide_eject( zxcf_idechn, LIBSPECTRUM_IDE_MASTER, zxcf_commit_wrapper,
&settings_current.zxcf_pri_file,
UI_MENU_ITEM_MEDIA_IDE_ZXCF_EJECT );
}
static void
set_zxcf_bank( int bank )
{
memory_page *page;
size_t i, offset;
for( i = 0; i < MEMORY_PAGES_IN_16K; i++ ) {
page = &zxcf_memory_map_romcs[i];
offset = i * MEMORY_PAGE_SIZE;
page->page = &ZXCFMEM[ bank ][ offset ];
page->writable = zxcf_writeenable;
page->contended = 0;
page->page_num = bank;
page->offset = offset;
}
}
/* Port read/writes */
static libspectrum_byte
zxcf_memctl_read( libspectrum_word port GCC_UNUSED, int *attached )
{
*attached = 1;
return 0xff;
}
static void
zxcf_memctl_write( libspectrum_word port GCC_UNUSED, libspectrum_byte data )
{
int was_paged = machine_current->ram.romcs;
last_memctl = data;
/* Bit 7 MEMOFF: 0=mem on, 1 =mem off */
machine_current->ram.romcs = ( data & 0x80 ) ? 0 : 1;
/* Bit 6 /MWRPROT: 0=mem protected, 1=mem writable */
zxcf_writeenable = ( data & 0x40 ) ? 1 : 0;
/* Bits 5-0: MEMBANK */
set_zxcf_bank( data & 0x3f );
machine_current->memory_map();
if( machine_current->ram.romcs != was_paged )
debugger_event( machine_current->ram.romcs ? page_event : unpage_event );
}
libspectrum_byte
zxcf_last_memctl( void )
{
return last_memctl;
}
static libspectrum_byte
zxcf_ide_read( libspectrum_word port, int *attached )
{
libspectrum_ide_register idereg = ( port >> 8 ) & 0x07;
*attached = 1;
return libspectrum_ide_read( zxcf_idechn, idereg );
}
static void
zxcf_ide_write( libspectrum_word port, libspectrum_byte data )
{
libspectrum_ide_register idereg;
idereg = ( port >> 8 ) & 0x07;
libspectrum_ide_write( zxcf_idechn, idereg, data );
}
static void
zxcf_memory_map( void )
{
int i;
if( !settings_current.zxcf_active ) return;
if( !settings_current.zxcf_upload ) {
for( i = 0; i < MEMORY_PAGES_IN_16K; i++ )
memory_map_read[i] = zxcf_memory_map_romcs[i];
}
for( i = 0; i < MEMORY_PAGES_IN_16K; i++ )
memory_map_write[i] = zxcf_memory_map_romcs[i];
}
static void
zxcf_from_snapshot( libspectrum_snap *snap )
{
size_t i;
if( !libspectrum_snap_zxcf_active( snap ) ) return;
settings_current.zxcf_active = 1;
settings_current.zxcf_upload = libspectrum_snap_zxcf_upload( snap );
zxcf_memctl_write( 0x10bf, libspectrum_snap_zxcf_memctl( snap ) );
for( i = 0; i < libspectrum_snap_zxcf_pages( snap ); i++ )
if( libspectrum_snap_zxcf_ram( snap, i ) )
memcpy( ZXCFMEM[ i ], libspectrum_snap_zxcf_ram( snap, i ),
ZXCF_PAGE_LENGTH );
}
static void
zxcf_to_snapshot( libspectrum_snap *snap )
{
size_t i;
libspectrum_byte *buffer;
if( !settings_current.zxcf_active ) return;
libspectrum_snap_set_zxcf_active( snap, 1 );
libspectrum_snap_set_zxcf_upload( snap, settings_current.zxcf_upload );
libspectrum_snap_set_zxcf_memctl( snap, last_memctl );
libspectrum_snap_set_zxcf_pages( snap, ZXCF_PAGES );
for( i = 0; i < ZXCF_PAGES; i++ ) {
buffer = malloc( ZXCF_PAGE_LENGTH * sizeof( libspectrum_byte ) );
if( !buffer ) {
ui_error( UI_ERROR_ERROR, "Out of memory at %s:%d", __FILE__, __LINE__ );
return;
}
memcpy( buffer, ZXCFMEM[ i ], ZXCF_PAGE_LENGTH );
libspectrum_snap_set_zxcf_ram( snap, i, buffer );
}
}
static void
zxcf_activate( void )
{
if( !memory_allocated ) {
int i;
libspectrum_byte *memory =
memory_pool_allocate_persistent( ZXCF_PAGES * ZXCF_PAGE_LENGTH, 1 );
for( i = 0; i < ZXCF_PAGES; i++ )
ZXCFMEM[i] = memory + i * ZXCF_PAGE_LENGTH;
memory_allocated = 1;
}
}
int
zxcf_unittest( void )
{
int r = 0;
int old_setting = settings_current.zxcf_active;
settings_current.zxcf_active = 1;
zxcf_memctl_write( 0x10b4, 0x00 );
r += unittests_assert_16k_page( 0x0000, zxcf_memory_source, 0 );
r += unittests_assert_16k_ram_page( 0x4000, 5 );
r += unittests_assert_16k_ram_page( 0x8000, 2 );
r += unittests_assert_16k_ram_page( 0xc000, 0 );
zxcf_memctl_write( 0x10b4, 0x3f );
r += unittests_assert_16k_page( 0x0000, zxcf_memory_source, 63 );
r += unittests_assert_16k_ram_page( 0x4000, 5 );
r += unittests_assert_16k_ram_page( 0x8000, 2 );
r += unittests_assert_16k_ram_page( 0xc000, 0 );
zxcf_memctl_write( 0x10b4, 0x80 );
r += unittests_paging_test_48( 2 );
settings_current.zxcf_active = old_setting;
return r;
}
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